The Complete Guide to Knife Blade Materials: Steels, Properties and Applications
The Soul of a Knife – Choosing the Perfect Steel
Imagine you’re in the middle of the woods on a hike. You need a knife that can cut wood, slice food, or even help you build a shelter. Now, think about how frustrating it would be to have a blade that chips, dulls too quickly, or rusts at the first contact with moisture.
That’s why choosing the right steel is so important. Steel is the soul of a knife: it determines its hardness, ability to hold an edge, resistance to corrosion, and durability. But there’s no “perfect” steel for every situation. The choice depends on what you’ll be using the knife for and your priorities, whether that’s strength, ease of sharpening, or resistance to the elements.
The evolution of knife steel is a fascinating story that combines tradition and innovation. From Japanese blacksmiths who have been working steels like Tamahagane for centuries, to modern steels developed with powder metallurgy like CPM S35VN , each material has its own history and specific function.
Over the centuries, blacksmiths have perfected techniques to create blades that are hard yet strong, sharp yet durable. A famous example is Damascus steel, known not only for its strength but also for its unique patterns that make it an art as well as a tool. Today, technology has introduced materials like M390 and Vanax, capable of offering performance unimaginable to the blacksmiths of old.
This article is a complete guide to the different types of steel used in cutlery. Whether you are a craftsman, a collector or simply an enthusiast, here you will find everything you need to know to choose the right material for your next knife.
Curiosities and History: Iconic Steels and Their Evolution in Cutlery
The history of knives is intertwined with the history of the materials used to forge their blades. Each steel has a story to tell, one of tradition, innovation, and legend. In this section, we explore some of the most famous alloys, such as the legendary Damascus steel and the practical 1095, and their impact on modern and traditional cutlery.
Damascus Steel: The King of Tradition and Aesthetics
Damascus steel is one of the most fascinating and mysterious materials ever used in the history of cutlery. Originally forged in the Middle East between the 3rd and 17th centuries, Damascus takes its name from the ancient city of Damascus, a crucial trading center for weapons and blades.
Its main features were:
- Combined Hardness and Flexibility : Using advanced lamination techniques, Damascus blades combined a hard center layer for the edge with softer outer layers for impact resistance.
- Unique Wavy Patterns : These distinctive patterns are the result of alternating different steels and heat treatment, making each blade a unique piece of art.
Today, traditional Damascus has been lost, but the technique has been reproduced with modern steels. Contemporary Damascus blades are used for both their aesthetics and functionality, making them prized by collectors and high-end chefs.
1095 Steel: The Practicality of Carbon
1095 steel is one of the most used in cutlery, known for being a practical and reliable material.
Main features:
- Simple Composition : A carbon steel with approximately 1% carbon, which gives it hardness and the ability to hold an edge.
- Ease of Sharpening : Compared to stainless steels, 1095 is easier to resharpen in the field.
Historically, 1095 has been used for military blades, hunting knives, and bushcraft tools due to its strength. However, the lack of chromium makes it susceptible to corrosion, requiring more maintenance. This steel remains a popular choice among traditional knife enthusiasts today.
Aogami and Shirogami: Traditional Japanese Steels
In Japan, the tradition of steelmaking has led to the creation of materials such as Aogami (Blue Steel) and Shirogami (White Steel) , produced by Hitachi Metals. These steels are derived from Tamahagane, the steel used for samurai swords, and are still used today in the production of high-end kitchen knives.
- Aogami (Blue Steel): Offers better wear resistance and superior edge retention. It is chosen for chef’s knives and precision tools.
- Shirogami (White Steel): Considered the purest steel, ideal for obtaining an extremely sharp edge.
Both steels keep alive the link with Japanese tradition, combining ancient techniques with modern needs.
Modern Steels: Innovation and Performance
The industrial revolution and advanced metallurgy have introduced modern steels such as CPM S35VN and M390 , considered the “super steels” for high-end knives. These materials offer:
- Unprecedented corrosion resistance.
- Exceptional thread retention .
- Balanced hardness and toughness thanks to powder metallurgy.
Modern steels combine lessons learned from tradition with technological innovations, offering superior performance for contemporary demands.
Historical Curiosities
- Viking Knives : Ancient Vikings used carbon steels tempered in cold water to create incredibly hard blades, ideal for battle.
- Medieval Swords : Medieval blacksmiths used Damascus-like rolling techniques to produce durable swords, such as the famous “Sword of Ulfberht”.
- Nitride Steels (H1) : Recently developed, they are perfect for use in marine environments thanks to their total resistance to corrosion.
The history of steels is a testament to the evolution of cutlery and the human ability to combine art and science. From traditional blacksmiths to modern metallurgists, each steel carries with it a piece of history and innovation. Knowing their origins and characteristics is not only useful for choosing a knife, but makes each blade an object full of meaning and culture.
Comparison between Traditional and Modern Steels
The choice between traditional and modern steels is a major consideration for craftsmen, collectors, and knife enthusiasts. Both categories have advantages and disadvantages, and the choice often depends on the intended use of the knife and personal preference. In this section, we analyze the main characteristics of traditional steels (such as 1095 and W2) versus modern super steels (such as S30V or ZDP-189).
Traditional Steels
Traditional steels have been used for centuries due to their simplicity of composition and ease of working. Some well-known examples include 1095 , W2 , and O1 .
Advantages:
- Ease of Sharpening : Traditional steels, such as 1095, are easier to sharpen in the field, even with simple tools.
- Adjustable hardness : Their composition allows for customized heat treatment to achieve a balance between hardness and toughness.
- Aesthetics : Steels like W2 are ideal for creating the famous ” hamon ” (visible temper line), particularly appreciated in handcrafted knives and Japanese swords.
- Cost-effectiveness : These materials are generally cheaper to produce and work with than super steels.
Disadvantages:
- Limited corrosion resistance : Traditional steels, such as 1095, are prone to rust and require regular maintenance (cleaning, oiling).
- Edge Retention : While they hold a good edge, they do not compete with modern super steels for wear resistance.
- Relative brittleness : In some cases, such as W2, they can be more brittle than modern high alloy steels.
Modern Steels
Modern steels, often called super steels , are the result of advanced metallurgy. Famous examples include S30V , S35VN , ZDP-189 , M390 , and Elmax .
Advantages:
- Corrosion Resistance : The presence of chromium, molybdenum and sometimes nitrogen gives extraordinary resistance to rust and the elements.
- Superior Edge Retention : Steels like ZDP-189 or CPM M4 maintain a sharp edge for very long periods, even with heavy use.
- High hardness and toughness : Thanks to powder metallurgy, modern steels combine high hardness with good impact resistance.
- Technological innovations : Steels such as H1 or LC200N are completely resistant to corrosion, ideal for extreme environments.
Disadvantages:
- Sharpening Difficulty : Due to their hardness and the presence of complex carbides, modern steels require specialized tools for sharpening.
- High Cost : Super steels are more complex and expensive to produce, making knives made from these materials less affordable.
- Heat Treatment Sensitivity : Modern steels require very precise heat treatment to achieve their maximum performance.
Direct Comparison
| Characteristic | Traditional Steels | Modern Steels |
|---|---|---|
| Ease of sharpening | High (eg 1095, W2) | Low (eg S30V, M390) |
| Corrosion resistance | Low (requires maintenance) | High (eg S35VN, H1, ZDP-189) |
| Thread holding | Good, but inferior to modern ones | Excellent, especially in super steels |
| Cost | Economic | High |
| Flexibility of use | Excellent for craftsmen and manual work | Best suited for specific applications |
| Aesthetics | Traditional, perfect for hamon and classic finishes | Technological, ideal for performance and resistance |
Which One to Choose?
- Traditional Steels : Ideal for craftsmen, survivalists and those looking for materials that are easy to work with and maintain. Perfect for bushcraft knives, machetes and rustic blades.
- Modern Steels : The best choice for collectors’ knives, high-end kitchen knives, or for those who need a low-maintenance blade that offers superior performance. Ideal for harsh environments, such as marine or humid environments.
Choosing between traditional and modern steels depends on your priorities: do you prefer practicality and historical charm, or do you want to exploit the best of modern technology? In either case, knowing the characteristics and limitations of each material will allow you to make an informed choice and get the most out of your knife.
Why Does the Right Steel Make a Difference?
The choice of blade material affects:
- Hardness and cutting ability : Harder blades may hold an edge longer, but can be brittle.
- Corrosion resistance : Essential in humid environments or for marine uses.
- Ease of sharpening : Too hard steel can be difficult to resharpen in the field.
- Durability : Some materials require more maintenance to avoid rust or wear.
Knowing the characteristics of steels allows you to select the perfect knife for your needs, whether it is bushcraft, cooking, hunting or collecting.
So let’s start our journey into blade materials, exploring every detail to help you make an informed and conscious choice.
Blade materials are the steels used to make the blade of a knife or other simple hand tool or weapon, such as a machete, hatchet, or sword.
The blade of a knife can be made from a variety of metallic materials or in modern times from composite materials using ceramics and plastics but for specific work areas such as kitchen knives.
For custom and industrial knives, however, steel remains the material used and for this reason it is important to know its final characteristics to obtain the knife with the most suitable material for its use or to help a customer who wants to make one or more knives in the correct and best choice.
The most common are steel:
- carbon,
- stainless,
- for tools and
- bound.
Other less common materials used in knife blades include: cobalt and titanium alloys, ceramics, obsidian, and plastics.
The hardness of steel is usually given as a number on the Rockwell C ( HRC ) scale.
The Rockwell scale is a hardness scale based on a material’s resistance to indentation, unlike other scales such as the Mohs scale (scratch resistance) used in mineralogy.
As the hardness increases, the blade becomes able to take and hold an edge better, but is more difficult to sharpen and more brittle (commonly called less “hard”).
Rolling a harder steel between a softer one is an expensive process that to some extent offers the advantages of both types (see Damascus steel).
Table 1: Comparison of Steels by Properties
| Steel | Hardness (HRC) | Corrosion Resistance | Tenacity | Ease of Sharpening | Recommended Applications |
|---|---|---|---|---|---|
| 1095 | 56-60 | Low | High | High | Bushcraft, Survival, Heavy Work |
| D2 | 58-61 | Moderate (semi-stainless) | Moderate | Average | Hunting and work knives |
| VG-10 | 59-61 | High | Moderate | Average | Kitchen Knives, High End EDC |
| CPM 3V | 58-61 | Moderate | Very high | Average | Survival, Heavy Work, Bushcraft |
| M390 | 60-62 | Very high | High | Low | Premium Knives, Kitchen, Collectibles |
| AUS-8 | 57-59 | High | Moderate | High | Kitchen Knives, EDC Cheap |
| 5160 | 54-58 | Low | Very high | High | Machetes, Swords, Heavy Tools |
| Elmax | 59-62 | Very high | High | Average | High-end multipurpose knives |
Table 2: Recommendations for Specific Use
| Knife Type | Recommended Steels | Reason for Choice |
|---|---|---|
| Hunting Knives | D2, CPM S35VN, 1095 | Edge retention, impact resistance, ease of sharpening in the field |
| Kitchen Knives | VG-10, 14C28N, M390, AUS-8 | Corrosion resistance, precision, long wire life |
| Survival Knives | CPM 3V, 1095, A2 | High tenacity, impact resistance, reliability in extreme conditions |
| Bushcraft | O1, 1095, Scandi Grind with carbon steel | Versatility, ease of resharpening, precision in wood carving |
| Machetes/Heavy Tools | 5160, 1055, SK-5 | High impact resistance and flexibility for heavy cutting |
| Collectible Knives | M390, Elmax, CPM S35VN | High-end materials, corrosion resistance, aesthetics and long wire life |
Table 3: Comparison between Traditional and Modern Steels
| Property | Traditional Steels (1095, W2, O1) | Modern Steels (M390, CPM 20CV, Elmax) |
|---|---|---|
| Ease of sharpening | High | Low |
| Corrosion resistance | Low | Very high |
| Thread retention | Moderate | Very high |
| Tenacity | High | High (varies by steel) |
| Cost | Economic | High |
| Applications | Practical use, survivalism, heavy work | Cooking, collecting, technical uses |
Steel
Steel: A Fundamental Base for Cutlery
Steel is the basic alloy used in the construction of knife blades, composed primarily of iron and carbon . The percentage of carbon is a crucial element that directly influences the properties of the material, such as hardness, toughness and wear resistance.
Main Features of Steel
- Composition : Steel is a ferrous alloy in which carbon represents less than 2.06% of the total weight. If the amount of carbon exceeds this limit, the alloy is classified as cast iron , which has very different mechanical properties and applications.
- Processing Flexibility : Steel can be heat treated to achieve a wide range of properties, making it extremely versatile for use in cutlery.
Role of Carbon
The amount of carbon in steel determines many of its fundamental properties:
- Low carbon steel (0.05% – 0.25%): Less hard, but tougher and easier to work. Used for tools requiring flexibility.
- Medium Carbon Steel (0.30% – 0.60%): Offers a good balance between hardness and toughness, suitable for utility knives.
- High Carbon Steel (0.60% – 1.00%+): Highly hard, ideal for hunting knives, bushcraft and tools requiring a sharp, long-lasting edge.
Advantages of Steel in Cutlery
- Versatility : It can be adapted for a wide range of applications thanks to specific heat treatments.
- Availability : It is easy to source and work with compared to other more advanced alloys.
- Excellent combination of properties : With the right treatment, steel can be hard, impact resistant, and capable of holding a sharp edge.
Steel is the most used material in cutlery for its ability to combine high performance with workability. Understanding its properties, especially the percentage of carbon, is essential to choose or work the most suitable material for each type of knife.
Alloy steels
- 5160, a spring steel. Popular steel for forging swords and large knives. High toughness and good wear resistance. Popular sword makers that use 5160 spring steel are Hanwei Forge and Generation 2. 5160 spring steel is mainly used on medieval-style swords.
- 6150, a chromium-vanadium alloy. Similar to 4140, 6150 is a tough steel with good impact resistance that can be hardened to the mid 50s on the HRC scale. While it is a good material for swords or hatchets, it is far from ideal for most knives due to its limited achievable hardness. It tolerates less than ideal temperature control in forging and heat treating (like 5160). It probably won’t hold an edge as well as 1095, but it is tough and easy to sharpen.
- V-toku1 / V-toku2, alloy steel with the original characteristics of W / Cr.
Tool steel grades used in cutlery: A, D, O, M, T, S, L, W. See also AISI tool steel grades.
The following are tool steels, which are alloy steels commonly used to produce hardened cutting tools:
- A2, a steel that trades wear resistance for toughness. It is used in custom combat knives by makers such as Phill Hartsfield, Rob Criswell, Mike Snody and John Fitzen (Razor Edge US) and one of the last to standardize his field/survival knives in A2 tool steel is Aaron Gough of Gough custom, Canada. A2 was the standard reference steel used by Bark River custom knives. A2 is used as the standard tool steel for the Black Wolf Knives range of hunting knives by Marc Godwin, Japan
- A3, (No description available)
- A4, (No description available)
- A5, (No description available)
- A6, this type of tool steel hardens in air at a relatively low temperature (about the same temperature as oil quenching grades) and is dimensionally stable. Therefore, it is commonly used for molds, forming tools, and gauges that do not require extreme wear resistance but require high stability.
- A7, (No description available)
- A8, C 0.55% Mn .30% Si .30% Cr 5.00% Mo 1.25% W 1.25%
- A9, (No description available)
- A10, this grade contains a uniform distribution of graphite particles to increase machinability and provide self-lubricating properties. It is commonly used for gauges, pins, shears and punches.
- D2, is a high carbon, high chromium die steel and is the highest carbon alloy tool and die steel typically used in knife making. With a chromium content of 12.00%, some call it a “semi-stainless”, due to the lack of free chromium in solution, although it is defined by ASM and ANSI as a stainless containing at least 11.5% chromium by weight. It deserves the informal myth, “D2 knives hold an edge forever and are impossible to sharpen.” While not as strong as premium carbon steels, it is much stronger than premium stainless steels. D2 knife blades were popularized by Jimmy Lile and later Bob Dozier.
- O1, a popular forged steel. Good wear resistance and excellent edge retention. Very strong, but not as strong as 5160. It is most commonly used by Randall Knives, Mad Dog Knives and many other custom knife makers.
- M2, is slightly harder than D-2. As a high speed tool steel, it is capable of maintaining a hardened cutting edge at high temperatures generated in various machining processes. However, it is not used as widely in factory production knives, as CPM M4 has become more popular. Custom knife makers still use it for knives intended for fine cutting with very thin edges.
- M4, see CPM REX M4 High Speed.
- T1 (No description available)
- T2 (No description available)
- S1, a medium carbon impact resistant tool steel combining moderate hardness with good impact resistance. Carbon content .40 – .55%.
- S7, a medium carbon impact resistant tool steel, with exceptional toughness and high strength, as well as medium wear resistance. It has the highest impact resistance and high compressive strength, which gives it good resistance to deformation during use, while maintaining good toughness.
- W1, a water hardening tool steel. High carbon content.
- W2, a tool steel that holds an edge fairly well but is not very tough. It has a carbon content of 1.5. The most readily available W2 has a carbon content of no more than 1-1.1%. It can be left at high hardness levels (can reach a dull hardness of 67 Rc) and still be quite hard especially in larger knives with thicker spines since the core of the thick part of the blade does not reach full hardness due to the deep hardening nature of the steel. Bill Moran considered it to be almost as hard as 5160, but for a time it was unavailable. W2 is one of the carbon steels that can produce a nice Hamon when heat treated.
- SK3, SK4, SK5 – Japanese carbon steels. SK stands for “Steel Kougu” which means “Steel Tool”. The lower number indicates less impurities.
CPM Tool Steel
Crucible Industries produces Crucible Particle Metallurgy (CPM) tool steels using a powdered metal forging process.
- CPM 1V, a patented steel, very high toughness, many times higher than A2 with the same level of wear resistance.
- CPM 3V, a proprietary steel, very high toughness, lower than CPM 1V, but higher than A2, and high wear resistance, better than CPM 1V. Used by several custom knife makers and factories, including Jerry Hossom, Mike Stewart [Bark River], Reese Weiland, Nathan Carothers, and Dan Keffeler. Great choice for swords and large knives.
- CPM 4V, a patented steel, high impact toughness and excellent wear resistance. Gaining popularity in Bladesports competition cutting knives.
- CPM 9V, a modification of CPM 10V with lower carbon and vanadium to improve toughness and resistance to thermal control.
- CPM 10V (AISI A11), a highly wear-resistant tool steel, comparable in toughness to D2 tool steel. Currently used by some custom knife makers, including Christopher “Big Chris” Berry. Phil Wilson pioneered the use of CPM 10V and numerous other CPM steels in sporting knives.
- CPM 15V, a patented, extremely wear-resistant tool steel, thanks to its 14.5% vanadium content. Found only in custom knives.
- CPM CRU-WEAR, a proprietary steel designed as a CPM upgrade to conventional Cru-Wear and D2 steels, offers improved wear resistance, toughness and hardness.
Chromium steel is a class of non-stainless steels used for applications such as bearings, tools, and drills.
- AISI 52100 steel, ball bearings. In terms of wear resistance, a little better than O1 steel, however 52100 is also more durable. It has very fine carbides, which results in high stability of the cutting edge. Used by many custom manufacturers, Swamp Rat knives use 52100 steel under the name SR101. Also referred to as 100 Cr 6/102 Cr6 under ISO nomenclature and conforms to BS En31 grade.
- SUJ2, Japanese equivalent to AISI 52100 steel.
- DIN 5401
Semi-stainless steels
Steels that do not fall into the stainless category because they may not have enough of a certain element, such as chromium.
- V-Gin1, a fine grain steel with Mo, V for best Cr effect.
- V-Gin2, more Cr is added for better corrosion resistance.
- V-Gin3B, more Cr is added for better corrosion resistance.
Stainless steel is a popular material class for knife blades because it resists corrosion and is easy to maintain.
However, it is not impervious to corrosion or rust.
For a steel to be considered stainless it must have a chromium content of at least 10.5%.
Steels 154CM / ATS-34
These two steels are virtually identical in composition. They were introduced into custom knives by Bob Loveless around 1972.
- 154CM is manufactured by Crucible Industries. It is widely used by Benchmade Knife Company and many others.
- CPM 154 is identical to 154CM in composition, however it is produced by Crucible using the CPM process, offering all the benefits of Particle Metallurgy technology.
- ATS-34 is manufactured by Hitachi Metals.
The last two are considered premium cutlery steels for both folding knives and fixed blades.
300 Series
American stainless steel produced by Allegheny Technologies, North American Stainless and Crucible Industries.
Since the 300 series is non-hardenable (non-martensitic), they are primarily used in entry level dive knives and used as outer layers in a San Mai blade.
- The 300 series is non-magnetic.
- 302 is an austenitic chromium-nickel alloy used for blenders and mixers.
- 303 is an austenitic stainless steel specifically designed to exhibit improved machinability.
- 303 SE is an austenitic chromium-nickel steel to which selenium has been added to improve machinability and wear characteristics.
- 304L is a low carbon austenitic chromium-nickel steel designed for special applications.
- 316L is a low carbon austenitic chromium-nickel steel with superior corrosion and heat resistance qualities.
- 321 is an austenitic chromium-nickel steel with a high chromium content of 18.00%.
400 Series
- The 400 series remains one of the most popular choices among knife makers because it is easy to sharpen and is resistant to corrosion.
- The 400 series is magnetic.
- 410 is a hardenable straight chromium stainless steel that combines superior wear resistance with excellent corrosion resistance.
- 416 is very similar to 410 with the addition of sulfur to improve workability.
- 420 has more carbon than 410, but less than 440. As such, it is softer than 440, but has greater toughness.
The 420 series contains several types with various carbon contents between 0.15% and 0.40%.
This kind of steel is widely used to make high-end razor blades, surgical scalpels, etc.
It gets about 57 HRC after proper heat treatment.
420HC (420C) is a higher carbon 420 stainless steel. HC stands for “high carbon” and can be hardened to a higher grade than regular 420 and should not be mistaken for it.
Buck Knives and Gerber Knives use 420HC extensively. 420A (420J1) and 420B (420J2) are economical, highly corrosion-resistant stainless steels.
Knife makers use this material in inexpensive knives, even diving knives because of its high corrosion resistance.
The 440 series has three types: 440A, 440B and 440C.
440A is a relatively inexpensive, highly corrosion-resistant stainless steel.
In China, Ahonest ChangJiang Stainless Steel has developed 7Cr17MoV, a modified 440A, adding more vanadium.
440B is nearly identical to 440A, but has a higher carbon content range than 440A.
440C is considered a high-end stainless steel.
It is highly resistant to corrosion and is one of the most common stainless alloys used for knife making.
The once ubiquitous Model 110 Folding Hunter was made of 440C prior to 1981. 440C has the highest carbon content in the 440 group.
Böhler n695 is equivalent to 440C.
Typically knife blades specified as “440” can be assumed to be of the lower hardness grade 440A.
AUS Series
The AUS series stainless steel is produced by Aichi Steel Corporation of Japan.
They differ from the AISI 4xx series because they have added vanadium.
Vanadium improves wear resistance, toughness and ease of sharpening.
The added “A” in the alloy name indicates that the alloy has been annealed.
- AUS-6 (6A) is comparable to 440A with a carbon content close to 0.65%. It is a lower cost steel, with slightly higher wear resistance than 420J.
- AUS-8 (8A) is comparable to 440B with a carbon content near 0.75%. AUS-8 is often used in place of 440C. SOG knives use AUS-8 extensively.
- AUS-10 (10A) is comparable to 440C with a carbon content close to 1.10%. It is slightly stronger than 440C.
CPM SxxV Series
The SxxV series are Crucible Industries stainless steels produced using the CPM process.
- CPM S30V, at the lower end of the SxxV steels, has a carbon content of 1.45%. However, S30V is still considered a better choice for knife making. CPM S30V is used in a wide range of ZT knives.
- CPM S35VN is a martensitic stainless steel designed to offer greater toughness than CPM S30V. It is also easier to machine and polish than CPM S30V. It is used in many high-end kitchen knives, including those from New West Knifemakers.
- CPM S60V (formerly CPM T440V) (discontinued), very high in vanadium. CPM S60V has a carbon content of 2.15%. It used to be a rare steel, but both Spyderco and Kershaw Knives offered knives made of this steel, Boker still offers folders made of CPM S60V.
- CPM S90V (formerly CPM T420V) has less chromium than S60V, but nearly twice as much vanadium. The carbon content of S90V is also higher, at around 2.30%.
- CPM S110V has higher corrosion resistance than S90V and slightly better wear resistance. The added corrosion resistance while retaining all the benefits of S90V makes this steel highly desirable for kitchen cutlery.
- CPM S125V, online information is unavailable as of August 2014, contact Crucible Industries sales for information. Contains 3.25% carbon, 14% chromium, and 12% vanadium, plus other alloying elements. Exceptionally high wear resistance, making it difficult for knife makers to machine and work with. Initially used only in custom knives, it has been used by larger manufacturers more recently in very limited quantities.
VGA SeriesJapanese stainless steels, produced by Takefu Special Steel.
- VG-1, Takefu stainless steel. Popular steel in Japanese kitchen knives.
- VG-2, medium carbon Mo stainless steel blade.
- VG-5, the synergistic effect of Mo and V makes the carbide finer.
- VG-7 / VG-8W, strengthens the substrate and improves tempering performance.
- VG-10 (B/W), Takefu stainless steel, similar in composition to VG-1 but also contains cobalt and vanadium. Good wear and rust resistance.
- San-mai, a composite steel used to make high-end knives. The core is VG-1 and the outer layers are 420j for good rust resistance.
Due to the small vanadium content, VG-10 has a finer grain content than VG-1.
Cobalt and nickel improve toughness.
Overall, it has better edge stability than VG-1. VG-10 is widely used in Japanese kitchen knives, several manufacturers use it in various folders and fixed blade knives, including Spyderco, Cold Steel and Fallkniven.
CTS Series American stainless steels produced by Carpenter Technology using vacuum-melt technology.
- CTS-BD1, high carbon chromium steel providing stainless properties with high hardness and excellent wear resistance.
- CTS-20 (CV), offers superior edge retention and surface finish, the ability to be machined to a thin edge, and consistent heat treatability from batch to batch.
- CTS-BD30P
- CTS-40C (CP), a powder metallurgical high carbon chromium stainless steel designed to provide stainless properties with maximum hardness.
- CTS-TMT, a hardenable martensitic stainless steel that combines improved corrosion resistance over Type 410 stainless steel with a hardness up to 53 HRC and improved formability above 17Cr-4Ni.
- CTS-XHP, a powder metallurgy alloy, air hardening, high carbon, high chromium, corrosion resistant. It can be regarded as a high hardness 440C stainless steel or a corrosion resistant D2 tool steel.
CrMo / CrMoV Series Chinese and American stainless steels; manufacturers are unknown except for 14-4CrMo which is produced by Latrobe Specialty Metals.
(The following are ordered by first number.)
- 14-4CrMo, produced by Latrobe Specialty Metals. A wear-resistant martensitic stainless tool steel that has better corrosion resistance than 440C stainless steel.
- 2Cr13, belongs to 420 series, very simple. EN 1.4021 / DIN X20Cr13, widely used in economic cutting tools, 50HRC max after heat treatment.
- 3Cr13, in the 420 grade series, contains 420A 420B 420C 420D. 3Cr13 steel is 420B, EN 1.4028 / DIN X30Cr13, Approximately 52HRC after heat treatment.
- 3Cr13MoV, obtained by adding more elements molybdenum and vanadium to the formula 420J2-3Cr13.
- 4Cr13, EN 1.4034 / DIN X46Cr13, 420C stainless steel, achieves about 55-57HRC.
- 4Cr13Mo, EN 1.4419 / DIN X38CrMo14, developed on the basis of GB 4Cr13 / DIN X46Cr13 by adding molybdenum.
- 4Cr14MoV, EN 1.4117 / DIN X38CrMoV15, good enough for making kitchen knives.
- 5Cr15MoV, some knife makers call it 5Cr13MoV, the hardness could be 55–57 HRC. It is widely used to make kitchen knives, high-end scissors, folding knives, hunting knives, etc.
- 6Cr13MoV, also written as 6Cr14MoV. The patented name applied by Ahonest Changjiang Stainless Steel Co., Ltd. Similar to 6Cr14 (6Cr13)/420D grade stainless steel which contains no molybdenum and vanadium, is superior for making razor blades, surgical scalpels, etc.
- 7Cr17MoV, 440A modified with multiple vanadium elements. The advantages of vanadium (V): increases strength, wear resistance and increases toughness; the recommended hardness is approximately 55/57 HRC.
- 8Cr13MoV and 8Cr14MoV, similar to AICHI AUS-8, an excellently priced steel for its performance.
- 9Cr13MoVCo, 9Cr14MoV. Chinese made steels similar to 440B but with higher carbon, cobalt and vanadium content to add more strength to the blade. Uses include high end barber scissors, hunting knives, etc.
- 9Cr18MoV, 440B modified, a high-end Chinese stainless steel mainly used in high-end barber scissors and surgical instruments.
- 9Cr19MoV, used in items such as the Ultimate Pro Bear Grylls Survival Knife.
- 99Cr18MoV, 440C modified. Developed by Jaktkit and Ahonest Changjiang in collaboration. It uses ESR technology and hot stamping. This improves its working performance, especially the toughness and edge holding ability.
Sandvik Series
- 6C27, a common knife steel with good corrosion resistance and low hardness, mainly used in applications where the need for wear resistance is low.
- 7C27Mo2, generally the same properties as Sandvik 6C27, but with improved corrosion resistance.
- 12C27, a grade with high hardness and good wear resistance. Takes a very sharp edge with moderate edge retention.
- 12C27M, another Swedish stainless razor steel. A very pure, fine-grained alloy. A grade with good wear resistance and good corrosion resistance, suitable for kitchenware production.
- 13C26, also known as Swedish Stainless Razor Steel. Generally the same properties as Sandvik 12C27, but slightly harder but less resistant to corrosion. Swedish steel manufacturer Uddeholm AB also makes a virtually identical razor steel composition known as AEB-L, which they patented in 1928. Swedish razor steel is a very pure, fine-grained alloy that positively affects edge retention, edge stability and toughness.
- 14C28N, designed by Sandvik at Kershaw ‘s request to have the edge properties of 13C26 but with increased corrosion resistance through the addition of nitrogen and chromium. Available in Kershaw knives (since 2012) and other brands.
- 19C27, a grade with very high hardness and wear resistance.
DSR Series
Daido Stainless Tool Steels Used for Kitchen Knives and Scissors.
- DSR1K6 (M), similar to AUS-6 and VG2
- DSR7F, used for high hardness cutting parts.
- DSR1K7, a steel known to exist. No further information available.
- DSR1K8, a steel known to exist. No further information available.
- DSR1K9, a steel known to exist. No further information available.
- DSR10UA, used for small scissors.
- DSR1K11, a steel known to exist. No further information available.
High chromium/vanadium stainless steel
The following powder metallurgy steels contain very high levels of chromium, which at 18-20% produces a highly corrosion resistant steel matrix.
They also contain relatively high levels of vanadium (3.0% to 4.0%), producing a high volume of vanadium carbides in the steel matrix, combined with excellent abrasion-resistant edge retention.
- M390 – Bohler M390 Microclean. Third generation powder metallurgy technology in steel. Developed for knife blades requiring good corrosion resistance and very high hardness for excellent wear resistance. Chromium, molybdenum, vanadium and tungsten are added for excellent sharpness and edge retention. Can be polished to an extremely high finish. Hardens and tempers to 60–62 HRC, where it best balances edge retention and toughness. Due to its alloy concept, this steel offers extremely high wear resistance and high corrosion resistance.
- CPM-20CV – Essentially Crucible’s version of the M390.
- CTS 204P – Essentially Carpenter’s version of the M390.
- Elmax – Manufactured by Bohler-Uddeholm, Elmax is a corrosion resistant die steel through hardened using the third generation powder metallurgy process. It is often said to be superior to CPM S30V and CPM S35VN for edge retention and ease of sharpening. Used in most Microtech knives from 2013 onwards. Elmax is very similar to M390, CPM 20CV and CTS 204P, but has a slightly lower vanadium content and lacks any tungsten content.
More stainless
- ATS-55, produced by Hitachi Metals. It has a lower molybdenum content than ATS-34, is less wear resistant than ATS-34, and has also been reported to be less rust resistant than ATS-34.
- BG-42 Slightly higher in carbon, chromium, and molybdenum than ATS-34. Must be forged and heat treated at very high and precise temperatures. Can be used at very high hardness, such as RC 64-66. Should not be brittle, but high alloy steels usually are. Very expensive and difficult to machine. It is a martensitic high speed stainless steel that combines the quenching, hot hardness, and hardness retention characteristics of M50 high speed steels, with the corrosion and oxidation resistance of Type 440C stainless steel. Although it is often used for aerospace bearings and other critical applications, its excellent wear and corrosion resistance make it a superior choice for use in cutlery applications.
- Kin-2, Medium Carbon Mo, V Stainless Steel Blade.
- BNG10, a steel known to exist. No further information available.
- Co-Special, a steel known to exist. No further information available.
Several steel alloys have a carbon content close to or greater than 3%.
As usual, these steels can be hardened to extremely high levels, 65-67 HRC.
Toughness levels are not as high as CPM S90V steel, however they have high wear resistance and edge strength, making them a good choice for knives designed for light cutting and slicing work.
- Cowry-X is produced from Daido steel using the PM process. Contains 3% carbon, 20% chromium, 1.7% molybdenum and less than 1% vanadium. Other elements are not published or may not even exist. Used by Hattori Knives in their KD kitchen knife series.
- ZDP-189 is produced from Hitachi steel using the PM process. It contains 3% carbon and 20% chromium and contains tungsten and molybdenum. Used by several custom knife makers and factory manufacturers including Spyderco and Kershaw in the limited run Ken Onion Shallot folders. The Henckels Miyabi line markets this steel under the name “MC66”.
- R2 is a PM steel produced by Kobe Steel Japan (Kobelco). It is also known as SG2 (Special Gold 2) when marked as Takefu Specialty Steel.
- SRS-15 is a high speed tool steel (HSS) where the 15 represents 1.5% C. One of the first known Japanese “super steels”. The manufacturer is unknown. There is also an SRS-13 with 1.3% C.
CPM REX Series
- CPM REX M4 HC (AISI M4) is a high speed tool steel produced by Crucible using the CPM process. M4 has been around for a relatively long time, recently finding its way into high-end and custom production knives. Popular steel for use in Bladesports competition cutting knives.
- CPM REX 121, is a new high vanadium and cobalt bearing tool steel designed to offer a combination of the highest wear resistance, achievable hardness and red hardness available in a high speed steel.
- CPM REX 20 (HS) is a cobalt-free high speed steel produced using the CPM process.
- CPM REX 45 (HS) is an 8% cobalt modification of M3 High Speed Steel produced by the CPM process. As of September 2018, this steel has been used in some limited production Spyderco knives.
- CPM REX 54 HS is a cobalt-bearing high speed steel designed to offer an improvement in the red hardness of the popular M4 grade, whilst retaining wear properties equivalent to M4.
- CPM REX 66 (HSS) is a high speed steel made using the CPM process.
- CPM REX 76 (HSS) is a high speed steel produced by the CPM (Crucible Particle Metallurgy) process. It is heat treatable to HRC 68-70. Its high carbon, vanadium and cobalt content provides abrasion resistance comparable to T15 and red hardness superior to M42.
- CPM REX 86 (HSS) is a high speed steel made by the CPM process. It has a combination of high achievable hardness (68-70 HRC), red hardness and abrasive wear resistance for difficult machining applications, while maintaining good manufacturing characteristics and toughness. The composition is designed to provide a balance of vanadium-rich MC and tungsten-molybdenum-rich M6C primary carbides.
- CPM REX T15 (HSS) is a high speed steel made by the CPM process. It is a type of high speed tungsten containing high vanadium for excellent abrasion resistance and cobalt for good red hardness, and is used for cutting difficult-to-machine materials where high frictional heating is encountered.
Others
- Maxamet is marketed by its manufacturer as a middle ground between high-speed steel and cemented carbide. Carpenter claims that Maxamet has improved hardness and wear resistance over high-speed steels while being tougher than cemented carbides. As of early 2018, it has been used in several Spyderco production knives.
Super Stainless Steels
Steels in this category have a much higher resistance to the elements and corrosion than conventional stainless steels.
These steels are austenitic and non-magnetic.
They are used in knives designed for use in aggressive and highly corrosive environments, such as salt water, and areas with high humidity such as tropical forests, swamps, etc.
These steels may contain from 26% to 42% chromium and from 10% to 22% nickel and from 1.5 to 10% titanium, tantalum, vanadium, niobium, aluminum silicon, copper or molybdenum etc. or a combination thereof.
- H1, made by Myodo Metals, Japan. Used by Spyderco in their saltwater/dive knives. Benchmade also used it, later replaced with X15TN.
- X15Tn, French steel patented by Aubert & Duval, originally designed for the medical industry and jet ball bearings. According to the company’s data sheet it meets the EN 1.4123 (designation X40CrMoNV16-2) and UNS42025 standards. This is a martensitic stainless steel, with a high nitrogen content, remelted for optimum structure and properties. Used by Benchmade in their saltwater/diving knives.
- Also N680, Bohler-Uddeholm steel, is a martensitic stainless steel, very similar to X15TN. Used by Benchmade in their saltwater/diving knives.
- N690CO an Austrian stainless steel hardened to the high Rc50 range. Currently found in Spyderco’s Hossom knives and the recently discontinued Italian made Volpe. TOPS Knives also used it in their CQT magnum 711 knife. Also widely used by Fox Knives Military Division, Extrema Ratio, Böker and Steel Will Knives.
- Vanax, produced by Uddeholm, is a relatively new third-generation powder metallurgy blade steel, in which carbon is largely replaced by nitrogen. This results in a steel with extreme corrosion resistance, excellent edge retention, yet is quite easily resharpened while containing a relatively high volume of carbide for abrasive edge retention.
- LC200N (also known as Z-FiNit) produced by Zapp Precision Metals, is a high nitrogen alloyed tool steel that exhibits superior corrosion resistance combined with high toughness even at hardnesses up to 60 HRc. Spyderco uses this steel in many of their knives.
Carbon steels have less carbon than typical stainless steels, but it is the main element in the alloy.
They are more homogeneous than stainless steels and other high-alloy steels, having carbide only in very small inclusions in the iron.
The bulk material is harder than stainless steel, allowing them to maintain a sharper, sharper edge without bending when in contact with hard materials.
But they clog up more quickly because they lack hard inclusions to withstand the friction. This also makes them quicker to sharpen.
10xx SeriesThe 10xx series is the most popular choice for carbon steel used in knives and katanas.
They can take and maintain a very sharp edge.
- 1095, a popular high carbon knife steel; it is harder but more brittle than low carbon steels such as 1055, 1060, 1070, and 1080. It has a carbon content of 0.90-1.03%. Many older pocket knives and kitchen knives were made from 1095. It is still popular with many bushcrafters and survivalists due to its strength and ease of sharpening. With good heat treatment, 1095 and O-1 high carbon tool steels can make excellent knives.
- 1084, carbon content 0.80-0.93%. Often recommended to novice knife makers or those without more advanced heat treating equipment because it is easy to heat treat successfully under such conditions, but also used by many professional bladesmiths for various types of knives as it can make excellent knives.
- 1070, carbon content 0.65-0.75% Used in machetes.
- 1060, used in swords. It has a carbon content of 0.55-0.65%
- 1055, used in swords and machetes often heat treated to achieve a spring temper to reduce breakage. It has a carbon content of 0.48-0.55%
Vx Series
- V-1 / V-2 Chrome is added to improve shutdown performance.
- V-2C, pure carbon steel, with impure substances completely removed.
Aogami / Blue-Seriesan exotic, high-end Japanese steel produced by Hitachi. The “blue” refers not to the color of the steel itself, but to the color of the paper in which the raw steel is wrapped.
- Aogami / Blue-Num-1 A steel with higher tensile strength and sharpening ability than Blue-2.
- Aogami / Blue-Num-2 A steel with greater toughness and wear resistance than Blue-1.
- Aogami / Blue-Super A steel with greater toughness, tensile strength and edge stability than all other steels in its series.
- Aogami / Super blue The same steel as Blue-Super A
Shirogami / White series
- Shirogami / White-1 The hardest of the Hitachi steels, but lacks toughness.
- Shirogami / White-2 Harder than S / W-1 but with a lower carbon content, therefore slightly less hard.
Kigami Steel / Yellow Series
- “Better” steel than SK series, but worse than both Aogami and Shirogami. Used in high-end tools and low/medium class kitchen knives.
Other proprietary steels
- INFI, a unique steel used in Busse knives. It is a tough steel, which resists both wear and corrosion relatively well. Prior to 2002, INFI contained 0.5% carbon, 0.74% nitrogen, approximately 1% cobalt, and approximately 0.1% nickel. In 2002, Busse changed the composition of the steel by removing the nitrogen, but added 0.63% silicon for hardness, and the cobalt and nickel components were eliminated.
Other carbon steel These steels did not exist in a series.
- Shiro-2, Cr and Ni are added for better temper and ductility.
Unassigned Steels
When we talk about “unassigned steels” , we are referring to those materials that do not fall clearly into a well-defined category within the major groups of steels used for specific purposes.
Steels for Kitchen Knives and Entry-Level Knives
- 4116 Krupp (1.4116)
- Origin : German steel, produced by Thyssen-Krupp.
- Features : High corrosion resistance, moderate edge holding ability. Typical hardness of 54-56 HRC (56-60 HRC in some modern knives).
- Applications : Entry-level kitchen knives, cleavers and mid-range knives. Used by manufacturers such as Henkels and Wüsthof.
- Notes : Thanks to the cryogenic treatment, it offers better edge life than other entry-level steels.
- X55CrMo14 (1.4110)
- Origin : German steel used in Victorinox Swiss Army knives.
- Features : Good corrosion resistance, easy to sharpen, typical hardness of 55-56 HRC.
- Applications : Utility knives, kitchen knives and light tools.
- Notes : Ideal for applications requiring minimal maintenance.
High End Stainless Steels
- Sharp 440
- Origin : Made by Aichi Steel Corporation (Japan).
- Features : Similar to AUS-10, with an excellent balance of corrosion resistance and edge holding ability. Typical hardness of 58-60 HRC.
- Applications : High-end knives, especially for kitchen and general use.
- Notes : Considered a “super steel” for high-end applications, with superior performance to many 440 series steels.
- BRD4416
- Origin : Stainless steel of unknown origin.
- Features : High corrosion resistance and easy workability.
- Applications : Probably used for entry-level or utility knives.
- Notes : Requires further technical details for a complete evaluation.
Heavy Duty Steels & Outdoor Knives
- 80CrV2
- Origin : Carbon steel with added chromium and vanadium, often used in heavy duty knives.
- Features : High toughness, excellent impact absorption and shock resistance. Easy to sharpen.
- Applications : Machetes, survival and bushcraft knives, heavy cutting tools.
- Notes : Comparable to 5160, but with improved edge holding ability due to vanadium.
Specialized Steels
- AL-158
- Provenance : Little documented steel.
- Features : Technical specifications are not available. This could be a tool steel or industrial steel.
- Applications : Unknown, but could be used for niche or custom knives.
- Notes : Additional information needed to classify it accurately.
Recommendations for Reorganization
- 4116 Krupp and X55CrMo14 can be assigned to the group stainless steels for kitchen and utility knives .
- Acuto 440 and BRD4416 fall into the high-end stainless steel group.
- 80CrV2 is a perfect candidate for the heavy duty and outdoor steel group.
- AL-158 remains in a specialized category pending further information.
| Steel | Origin | Characteristics | Applications | Notes |
|---|---|---|---|---|
| 4116 Krupp | ThyssenKrupp (Germany) | High corrosion resistance, hardness 54-56 HRC, medium edge holding. | Entry-level kitchen knives, cleavers. | Cryogenic treatment improves the wire. |
| X55CrMo14 | Victorinox (Germany) | Good corrosion resistance, hardness 55-56 HRC, easy to sharpen. | Swiss Army knives, kitchen knives. | Ideal for lightweight, multipurpose tools. |
| Sharp 440 | Aichi Steel (Japan) | Corrosion resistant, hardness 58-60 HRC, excellent thread holding. | High-end knives, especially kitchen knives. | Comparable to AUS-10, Aichi “super steel”. |
| BRD4416 | Origin unknown | High corrosion resistance, easy workability. | Entry-level or multipurpose knives. | Incomplete technical specifications. |
| 80CrV2 | – | High toughness, excellent impact resistance, easy sharpening. | Machetes, survival knives and bushcraft. | Similar to 5160, better thread holding. |
| AL-158 | Origin unknown | Undocumented specifications. | Unknown. | Further details required. |
Insights into Heat Treatments for Knife Blades
Heat treatments are fundamental processes to optimize the properties of steel and obtain blades that meet specific needs, such as hardness, toughness and wear resistance. Techniques such as hardening , tempering and cryogenic treatment play a crucial role in preparing a blade that is durable, performs and suitable for its use.
1. Temper
Quenching is one of the most important thermal processes used to transform a piece of raw steel into a functional blade. It involves heating the steel to a critical temperature (determined by the steel grade) and then rapidly cooling it in a medium such as oil, water, or air.
Tempering Goals:
- Increase hardness .
- Improve wear resistance.
- Create a martensitic structure in the steel, which offers a combination of hardness and strength.
Practical example:
A carbon steel like 1095 is hardened by heating it to about 800°C and then rapidly cooling it in oil. This process increases the hardness, allowing the blade to hold a sharp edge longer. However, the high hardness makes the blade more brittle, so a second treatment is needed: tempering.
2.Discovery
After tempering, steel is often too brittle to be used. Tempering is a heat treatment that reduces the brittleness of the blade and improves toughness, while maintaining good hardness.
How it works:
- The steel is heated to a temperature below the critical temperature (150-600°C, depending on the type of steel).
- Slow heating followed by controlled cooling modifies the martensitic structure, making it more stable.
Effects:
- Reduces internal stress generated by tempering.
- Improves resistance to impacts and mechanical stress.
Practical example:
A D2 blade is tempered at around 200-300°C to achieve a balance between hardness (60 HRC) and toughness, ideal for heavy duty knives such as survival or hunting knives.
3. Cryogenic Treatment
Cryogenic treatment is an advanced technique that exposes steel to extremely low temperatures (as low as -196°C) using liquid nitrogen. This process is often performed after tempering to further improve the material’s properties.
Advantages of cryogenic treatment:
- It completes the transformation of martensitic steel, eliminating any residues of austenite (a less stable and softer phase).
- Improves wear resistance, making the blade more durable.
- It can increase overall hardness and dimensional stability.
Practical example:
A steel like CPM S30V benefits from cryogenic treatment, which maximizes carbide formation and increases wear resistance. This is especially useful for professional kitchen knives or high precision blades.
4. Other Specific Treatments
In addition to the three main ones, there are specific treatments to adapt the properties of steel to particular applications.
Normalization:
- Heating steel to a temperature above the critical temperature, followed by slow cooling in air.
- Reduces internal stresses and prepares the steel for subsequent treatments.
Annealing:
- Heating steel to a specific temperature and cooling it very slowly.
- Makes steel softer and easier to work with, often used before forging a blade.
Surface hardening:
- Application of localized treatments to increase surface hardness without compromising core toughness. Example: carburizing or nitriding .
How Heat Treatments Affect Performance
| Treatment | Main Effect | Typical Application |
|---|---|---|
| Temper | Increases hardness and wear resistance | Kitchen knives, bushcraft, hunting |
| Discovery | Improves toughness and reduces brittleness | Survival knives, outdoor |
| Cryogenic treatment | Improves stability and wear resistance | Collectible knives, professional |
| Normalization | Reduces stress and prepares for other treatments | Industrial processing |
| Annealing | Makes steel more workable | Forging, handcrafted knives |
Heat treatments are the key to turning a piece of steel into a blade that performs at its best. Understanding how quenching, tempering, and cryogenic treatment affect the properties of steel will help you evaluate the quality of a knife and choose the perfect blade for your purpose. For anyone who makes or uses knives, heat treatments are a fusion of science and art that defines the essence of a great blade.
Trends and Innovations in the Cutlery Steel Sector
In recent years, the cutlery industry has seen a revolution with the introduction of new advanced steels that combine high performance with characteristics never achieved before. These materials, developed using modern technologies such as powder metallurgy , offer a perfect mix of hardness, corrosion resistance and edge retention, meeting the needs of both professionals and enthusiasts.
Advanced Steels: M390, Elmax and CPM 20CV
Steels such as M390 , Elmax , and CPM 20CV represent the cutting edge of modern metallurgy. These materials are designed for high-end knives, ensuring superior performance in terms of:
- Edge Retention : They stay sharp much longer than traditional steels, even with intensive use.
- Corrosion Resistance : Ideal for harsh or humid environments, such as marine use or professional cooking.
- Wear resistance : Thanks to the high content of vanadium and chromium carbides.
M390 , for example , is one of the most popular materials for collectible and utility knives, thanks to its ability to combine high hardness (up to 62 HRC) with extraordinary resistance to rust. Likewise, CPM 20CV is often considered an American version of M390, with virtually identical properties.
Super Stainless Steels: LC200N and Vanax
Another key trend is the introduction of super stainless steels , designed to offer extreme resistance to corrosion without compromising hardness and performance. These materials are ideal for knives intended for use in highly aggressive environments, such as the sea or areas with high humidity.
- LC200N (also known as Z-FiNit): A high nitrogen steel used primarily by brands such as Spyderco. It is widely regarded for its resistance to rust, even under constant immersion in salt water, and for its excellent toughness.
- Vanax : A third-generation steel from Uddeholm, combining nitrogen instead of carbon to achieve exceptional corrosion resistance and excellent edge stability. It is particularly suitable for kitchen or diving knives.
These super steels are a game changer for those looking for knives with minimal maintenance , without sacrificing cutting performance or edge life.
Technological Innovations
New technologies in steel production include:
- Powder Metallurgy : Allows the creation of steels with a fine grain structure, improving wear resistance and the ability to hold a sharp edge.
- Cryogenic treatments : Used to further strengthen the internal structure of the steel, increasing its hardness and durability.
- Nitrogen-filled steels : Like LC200N and H1, they almost completely eliminate corrosion problems.
| Knife Type | Recommended Steels | Main Features |
|---|---|---|
| Hunting Knives | D2, 1095, CPM S35VN, A2 | Excellent edge retention, impact resistance, easy to resharpen in the field, requires oiling (1095). |
| Kitchen Knives | VG-10, 14C28N, M390, AUS-8 | Corrosion resistance, ability to hold edge, ease of sharpening (14C28N), ideal for precision. |
| Survival Knives | 1095, CPM 3V, S30V, A2 | High toughness, impact resistance, durability in extreme conditions, regular maintenance required (1095). |
| Bushcraft Blades | O1, 1095, Scandi Grind with carbon steel, CPM 3V | Versatility, perfect for carving and precision work, easy to resharpen (O1 and 1095). |
| Machetes and Heavy Tools | 5160, 1055, SK-5, 80CrV2 | High impact resistance, flexibility, durability for heavy cutting, easy resharpening (1055, SK-5). |
Modern trends are redefining the standards of cutlery, offering materials that combine tradition and innovation. Whether it is a collector’s knife in M390 or a marine knife in LC200N , advanced steels are the future, allowing for exceptional performance in every situation. As metallurgy continues to evolve, we can expect even more performing materials in the coming years.
Practical Applications of Steels: Which One to Choose for Each Type of Knife
Each steel has specific characteristics that make it more or less suitable for certain uses. In this section we analyze the ideal steels for some of the most common applications, such as hunting knives, kitchen knives, survival knives, bushcraft knives and machetes or heavy cutting tools.
1. Hunting Knives
Hunting knives must be sturdy, hold their edge for a long time, and be easy to sharpen in the field. They must be able to handle tough jobs like processing game and cutting tough materials.
Recommended steels:
- D2 : Semi-stainless with excellent edge retention, ideal for extended work.
- 1095 : Carbon steel that is easy to resharpen in the field, but requires regular oiling to prevent rust.
- CPM S35VN : Offers a combination of hardness, wear resistance and corrosion resistance, perfect for high-end hunting knives.
- A2 : A tool steel with good toughness and impact resistance.
Practical example:
A D2 blade knife is perfect for those who need a long-lasting edge for cleaning game. However, if you are in a humid environment, a steel like CPM S35VN can prevent corrosion without sacrificing performance.
2. Kitchen Knives
Kitchen knives should have blades that are corrosion-resistant, easy to sharpen, and able to hold a sharp edge for precision cutting.
Recommended steels:
- VG-10 : Excellent Japanese steel for high-end kitchen knives, with excellent corrosion resistance and edge retention.
- 14C28N (Sandvik) : A Swedish steel with good corrosion resistance, excellent toughness and ease of sharpening.
- M390 : Perfect for premium kitchen knives, thanks to its exceptional resistance to corrosion and the ability to maintain a very sharp edge.
- AUS-8 : An economical yet functional option for entry-level kitchen knives.
Practical example:
A chef’s knife with a VG-10 blade is ideal for precision work such as slicing fish or vegetables. For heavy use in professional kitchens, a material like M390 offers unbeatable performance.
3. Survival Knives
Survival knives must be rugged, impact-resistant, and capable of handling a wide range of tasks, from woodworking to cutting hard materials.
Recommended steels:
- 1095 : Durable, easy to sharpen and reliable, but requires maintenance to prevent rust.
- CPM 3V : Exceptional toughness, impact resistance and excellent edge holding ability, ideal for extreme situations.
- S30V : Corrosion and wear resistant, great for premium survival knives.
- A2 : A good compromise between robustness and ease of maintenance.
Practical example:
For bushcrafters or survivalists, a 1095 knife offers ease of sharpening and reliability. However, in extreme or humid climates, a CPM 3V knife guarantees superior performance without the risk of corrosion.
4. Blades for Bushcraft
Bushcraft knives need to be versatile and durable, suitable for tasks such as wood carving, fire starting and precision work.
Recommended steels:
- O1 : Great for wood carving, with a strong, easy to sharpen edge.
- 1095 : Popular among bushcrafters for its combination of ruggedness and ease of maintenance.
- Scandi Grind with carbon steel : Widely used in Nordic knives, perfect for precision work on wood.
- CPM 3V : For those looking for greater wear resistance and superior toughness.
Practical example:
An O1 blade knife is perfect for those who want a steel that can be easily resharpened in the field, while for the advanced bushcrafter, a steel like CPM 3V offers exceptional durability and performance.
5. Machetes and Heavy Cutting Tools
Heavy-duty cutting tools such as machetes must be highly resistant to impact and bending, with high toughness to withstand heavy use.
Recommended steels:
- 5160 : Spring steel with excellent toughness, ideal for machetes and heavy tools.
- 1055 : Impact resistant, with good flexibility which reduces the risk of breakage.
- SK-5 : Japanese carbon steel, strong and easy to resharpen, perfect for budget machetes.
- 80CrV2 : A strong steel with an excellent balance between hardness and impact resistance.
Practical example:
A 5160 machete is ideal for heavy-duty work such as cutting through thick vegetation, due to its high toughness. For those looking for a budget option, 1055 steel offers reliable performance and long life.
Each steel has unique characteristics that make it suitable for specific applications. Knowing the properties of each material will help you choose the ideal knife for your needs, whether hunting, cooking, survival, bushcraft or heavy work. Choosing the right steel means not only better performance, but also a more satisfying and long-lasting experience.
Maintenance and Care of Different Knife Blade Materials
Regular maintenance is essential to maintaining the performance and longevity of a knife, regardless of the type of blade material. Each steel has its own characteristics, and adopting the correct care techniques will help you keep it in tip-top condition. Here is a practical guide to maintaining blades made of carbon steel , stainless steel , and other advanced materials.
1.Carbon Steel Blades
Carbon steel, such as 1095 or W2, is known for its ability to hold a sharp edge and for being easy to resharpen. However, it is more susceptible to corrosion than stainless steels.
Maintenance tips:
- Rust Prevention :
- After each use, clean the blade with a dry cloth to remove moisture and residue.
- Apply a thin layer of protective oil, such as mineral oil or a knife-specific lubricant.
- In humid or saline environments, use oils with advanced anti-corrosion properties.
- Cleaning :
- Avoid running water if possible, preferring instead a damp cloth for cleaning.
- Do not leave the blade in contact with acidic or salty liquids, which can accelerate the formation of rust.
- Sharpening :
- Use medium and fine grit stones to sharpen these blades. Carbon steel sharpens easily, but requires more frequent maintenance.
- Protection :
- Store your knife in a dry place, preferably in a leather sheath or scabbard that allows for ventilation.
2. Stainless Steel Blades
Stainless steels, such as 440C, VG-10, or CPM S35VN, offer excellent corrosion resistance, but still require regular maintenance to maintain optimum performance.
Maintenance tips:
- Cleaning :
- After use, wash the blade with warm water and neutral soap. Dry it immediately to avoid water spots or mineral deposits.
- Avoid harsh or abrasive cleaners that may damage the blade coating.
- Sharpening :
- High-end stainless steels can be difficult to sharpen. Use diamond stones or sharpening systems specifically for hard steels (60+ HRC).
- Sharpen with slow, controlled movements to avoid overheating the edge.
- Protection :
- Although resistant to corrosion, a light coating of knife lubricating oil is always advisable, especially in very humid or saline environments.
- Store your knife in a synthetic sheath to prevent the leather from absorbing moisture.
3. Blades in Super Steels and Advanced Materials
Materials such as M390 , LC200N , or Elmax combine high hardness with corrosion resistance, requiring less maintenance than traditional steels.
Maintenance tips:
- Cleaning :
- Use a damp cloth to remove dirt and residue. These steels are highly resistant to corrosion, but it is still a good practice to dry them after use.
- Sharpening :
- Super steels require high-quality stones, such as diamond stones or professional sharpening systems.
- Due to the high hardness, resharpen only when necessary to avoid excessive wear of the edge.
- Protection :
- They do not require constant oiling, but in extreme environments (marine or tropical) it is always better to apply a protective layer.
- Store in a hard case or moisture-proof pouch.
4. Sheaths, Linings and Storage
Proper storage of a knife is essential to prevent deterioration, regardless of the blade material.
Sheath choice:
- Leather : Elegant and durable, but can retain moisture, so is only suitable for dry environments.
- Nylon or Kydex : Waterproof and element-resistant synthetic materials, ideal for outdoor or marine use.
Long term storage:
- Avoid leaving the knife in the sheath for extended periods, as it may retain moisture.
- Use anti-humidity sachets (silica gel) to reduce the risk of corrosion, especially with carbon steels.
- Check the blade periodically to make sure no stains or signs of rust have formed.
5. General Advice
- Regular inspection : Always check the blade for signs of wear, rust or chipping, and address any issues promptly.
- Maintenance after each use : Cleaning and drying the knife after use is the best form of prevention.
- Avoid improper use : Do not use the knife for tasks not intended for the blade (eg lever or screwdriver), which could compromise its structure.
Each type of blade has its own unique needs, but regular care is the key to prolonging the life and ensuring maximum efficiency of your knife. Knowing the blade material and adopting proper maintenance techniques will allow you to preserve your knife for years, keeping it always ready for any challenge.
Conclusions
Choosing the steel for a knife is a crucial decision that directly affects the performance, durability, and effectiveness of the tool. Knowing the properties and characteristics of different steels allows you to choose or build blades perfectly suited to the specific use, whether it is hunting, cooking, survival, or heavy work.
Each type of steel offers a unique compromise between hardness, toughness, corrosion resistance, and ease of sharpening. From traditional carbon steels, which continue to be prized for their strength, to innovative super steels, designed for extreme performance, there is an option for every need.
For those who want to delve deeper into the world of knife steels, I highly recommend reading the book “Knife Engineering: Steel, Heat Treating, and Geometry” . This text is a reference for understanding:
- The effects of steels on knife performance.
- The role of heat treatments in improving hardness and toughness.
- Edge geometries and their impact on cutting efficiency.
The book offers detailed classifications for properties such as toughness, edge retention, and corrosion resistance, providing a comprehensive guide for professionals and hobbyists alike.
Whether you are building your own knife or choosing the perfect one for your needs, remember that the right steel can make the difference between a simple tool and a reliable companion. Study, experiment and choose carefully: your blade tells a story of functionality, style and passion.
Are You Experience?!
Andrea
FAQ: Knife Blade Materials
1. What are the main materials used for knife blades?
The main materials are:
- Carbon steel : excellent edge retention, easy to sharpen, but susceptible to corrosion.
- Stainless Steel : Corrosion resistant, requires less maintenance.
- Alloy steel : combination of different elements to improve specific properties (eg strength, hardness).
- Alternative materials : ceramics, titanium, cobalt alloys, obsidian and plastics (used for specific applications).
2. What is the difference between carbon steel and stainless steel?
- Carbon steel :
- Better sharpening ability and edge holding.
- More susceptible to rust if not cared for properly.
- Stainless steel :
- Corrosion resistant due to high chromium content.
- Slightly more difficult to sharpen than carbon steels.
3. What does the Rockwell Hardness Scale (HRC) mean and why is it important?
The Rockwell scale measures the hardness of a material. A blade with a higher HRC value:
- Advantages : Keeps the thread longer.
- Disadvantages : More fragile and difficult to resharpen. Blades between 56-62 HRC offer a good compromise for general purpose knives.
4. What is Damascus steel and why is it so prized?
Damascus steel is obtained by rolling steels of different hardness to combine:
- Hardness : Thanks to the inner layer.
- Tenacity : Thanks to the softer outer layers. It is also appreciated for its aesthetic appearance with unique wavy patterns.
5. What is the best steel for kitchen knives?
- Japanese stainless steel such as VG-10 or AUS-10 is excellent for high-end kitchen knives.
- Steels such as 14C28N (Sandvik) offer a good balance between corrosion resistance and edge retention.
6. What does “alloy steel” mean?
An alloy steel is enriched with additional elements (eg chromium, vanadium, molybdenum) to improve:
- Corrosion resistance .
- Tenacity .
- Thread retention .
7. What steels are most common in survival knives?
- 1095 (carbon steel) : Durable, easy to resharpen in the field.
- D2 (tool steel) : semi-stainless, excellent edge retention.
- CPM 3V (Advanced Tool Steel) : Excellent toughness and wear resistance.
8. What are “super steels”?
“Super steels” are advanced materials with superior corrosion resistance and edge retention. Examples:
- M390, CPM-20CV, CTS-204P : for premium knives.
- H1 or LC200N : highly resistant to corrosion, ideal for marine environments.
9. How to choose the blade material according to the use?
- General Purpose : 440C, AUS-8.
- Kitchen : VG-10, 14C28N, Sandvik steels.
- Outdoor/survival : 1095, CPM 3V.
- Marine environment : H1, LC200N.
- Collectibles/Aesthetics : Damascus Steel, Cowry-X.
10. What are the most common heat treatments?
- Tempering : Increases hardness.
- Tempering : Reduces brittleness.
- Cryogenic Hardening : Improves internal structure for greater wear resistance.
11. What makes a knife easy to sharpen?
- Steels with moderate vanadium content and fine grain structure are easier to sharpen, for example:
- 1095 (carbon steel) .
- 12C27 (Sandvik) .
12. Is harder steel always better?
Not always. A harder steel holds the edge better, but it can:
- Be more fragile.
- Break or chip under high impacts.
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