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Instructions for Hardening and Tempering 12C27 Steel12c27 is a popular Stainless Steel, made by Sandvik in Sweden. There are several hardening profiles suggested by Sandvik, the below is one of these, providing good hardening with a temperature controlled gas forge. 12c27 is possibly one of the easiest stainless steels to heat treat at home.*Disclaimer; I am an amateur knife maker, the below is only my understanding and experience, and not to be seen as authoritative advice. Heat …