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Heat treating at home

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Dennis1

06-05-2000 04:41:45




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I tried to read Heat Treating by U.S. steel & it was beyond me. Is a manual available that a mechanic could understand. thanks, Dennis 1.....




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Fred OH

06-06-2000 07:41:44




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 Re: heat treating at home in reply to Dennis1, 06-05-2000 04:41:45  
If you're just gonna heat treat something like an old car spring, (high carbon) heat it to a dull to bright cherry red and quench it in a oil bath. (any light to medium viscosity oil should work).You can use water for high carbon but don't heat it too high as it might crack. Check it with a file for hardness and draw it (called tempering) by heating it to 400 to 500 degrees while watching color bands running through it and quench it again. Usually straw to purple color. Takes some practice to get efficient at it. Some exotic tool steels require methods such as Steve described. L8R---- Fred

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Steve U.S. Alloys

06-05-2000 14:50:45




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 Re: heat treating at home in reply to Dennis1, 06-05-2000 04:41:45  
Hi Dennis,
Jeffersons Welding Encyclopedia would help you with some of the language by explaining such things as the different grain structure transformations (martensite, austenite, bainite, etc.) and other terms like eutectic point and so on.

I don't know what type of equipment you may have but temps need to be measured and held for periods of time per inch of thickness and then ramped down via computer program in some cases. Some materials will also require an inert gaseous atmosphere such as argon to be present in the oven while heat treatment takes place. The procedure varies depending on the type of metal and the desired end result. (tempering, annealing etc.)

Some materials can be successfully flame hardened without any elaborate equipment if hardness is what you are after.

HTH
Steve

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