doublegunshop.com - home Forums General Discussion DoubleGun BBS @ doublegunshop.com Who is doing quality color case hardening?

MH - excellent discussion. Thanks.

Sticking with your example above, is the frame mild steel or does it have enough carbon to do some through hardening? When you anneal the frame, are you actually annealing only the case "skin," or do you actually soften the frame some? Do you have a process more compicated than passing the frame through critical temperature and then cooling slowly? In theory, it would seem that the "skin" would anneal as soon as it reaches critical and that the pre-annealing would not be necessary; any ideas as to why the first annealing step is necessary? Since the frame already has a case "skin" of high carbon steel from the factory case process, why do you soak it again? Does warpage come from unequal "skin" stress early in the heat or from unequal "skin" stress coming out of heat, like in quench? Or, does it come from within the base metal? Thanks, if you care to answer these.