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Blacksmithing and Metallurgy

Heat Treating Instructions Needed

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Old 02-01-2018, 11:51:25 PM
DustyBar DustyBar is offline
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Default Heat Treating Instructions Needed

I need to harden a 2" diameter by 1/8" disc and need the maximum hardness possible. I heated them red hot and dropped them into water but they didn't get real hard. One is D2 which is air hardening. Do I just heat it red and let it air cool? The other one is 440 Stainless which I understand is oil quenched. Do I also heat it red and drop it in something like 30w motor oil? Do I have to hold it at red heat for a while first? I'm looking for maximum hardness for wear resistance.
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Old 02-02-2018, 08:37:56 AM
I like oldstuff I like oldstuff is offline
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Default Re: Heat Treating Instructions Needed

Got a smart phone? Download this free app from the ASM. It's a guide for heat treating many metals and is gospel.
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Old 02-02-2018, 04:51:53 PM
Larry Rusch Larry Rusch is offline
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Default Re: Heat Treating Instructions Needed

Here are a couple of instructions from presumably reliable sources.
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Old 02-02-2018, 11:17:55 PM
Pete Spaco Pete Spaco is offline
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Default Re: Heat Treating Instructions Needed

Both of those materials are to be hardened at about 1900 degrees F.
The stainless is to be oil quenched, but the D2 is an air hardening material that apparently can be oil quenched.

A "red heat" is a pretty loose term, for a number of reasons:

First, a "read heat" can be anything from 500 to 950 C (932F - 1742F).

Secondly, your eyes and brain may vary in their interpretation of what "red" is.

Since you have already unsuccessfully attempted to harden your parts, you really do need to normalize them before attempting to harden them again.
Another reason to dig into the specs suggested by previous posters.

Pete Stanaits
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