7 causes that generate cracks when the knife is turned off after the hardening

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7 causes that generate cracks when turning off the knife after the hardening just came out of the oven.

The cracks, cracks or cracks of the steel parts of the knives in service while you use it or while you are producing it occur very rarely fortunately, it is much easier than it does not temprite properly but when the steel blade “cracks”, the consequences are disastrous.

Translated, you have to throw away the blade!

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Ms-TT Tempering Oven by Prederi

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Ms-TT Tempering Oven by Prederi Ms-TT tempering oven from Prederi for knives.

Today the post is about this additional possibility for those who decide to do the thermal treatments of their own home made blades.

Prederi Vittorio & Sons is a company that was founded in Milan in 1960.

Prederi Vittorio & Sons is a leading international company for the design and production of electrical and industrial furnaces, applied to the thermal treatment sectors, scientific laboratories and research, goldsmith sector. Continue reading “Ms-TT Tempering Oven by Prederi”

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Turning off the hardening blade in oil or water?

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Turning off the hardening blade in oil or water?

Turning off the hardening blade in oil or water?

The shutdown phase after the temper is a key moment for a successful hardening!

There are several types of tempering treatments:

  • hard or ordinary,
  • vacuum one and
  • induction temper

are among the most used.

Today it is also very fashionable among knife makers cryogenic hardening but we will make a specific post for this type of heat treatment.

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The knife maker’s inconel and candy

InconelThe inconel and the candy of the knife maker.

The knife maker’s candy is called inconel, and it is the “tight dress” for the knife when it goes into temper.

Now it’s not something you need but if you want to take the level and quality of the temper to the next level this is one way.

The aim is to create a dress at the knife trying to bring out all the air inside what is called “candy” in the jargon. Continue reading “The knife maker’s inconel and candy”

The temper in forge and the color scale of incandescence

HardeningThe incandescent color scale depending on the temperature is one way to understand at what temperature is the steel you are heating to perform the tempering operation.

This is usually an unused method for those with knifemaker tempering ovens but uses a forge to reach the correct temperature that is crucial to perform a quality tempering process. Continue reading “The temper in forge and the color scale of incandescence”

Steel C70 and its alternative K720

C70

The C70 is one of the steels widely used in the cheap knifeshop.

It is used on low-end knives while having excellent qualities.

So-called carbon steel is a alloy consisting essentially of Fe (iron) and C (carbon) plus some other chemical element depending on the classification and the manufacturer.

It is a“simple”steel(at least on paper!)to work both for forging and for removal from a bar. Continue reading “Steel C70 and its alternative K720”