Rob Thomas Posted October 21, 2009 Share Posted October 21, 2009 I've been making some knives out of high carbon steel and hardening them once and they keep a very nice edge for a long time and take a lot of abuse, my question is why i've heard to always harden three to five times? When i did my blade tip cracked on the top! I have let my blade cool completely, in the oil. cool enough to handle bare-handed. This blade was also annealed over night in ashes, before i started the hardening process.:confused: Quote Link to comment Share on other sites More sharing options...
ThomasPowers Posted October 21, 2009 Share Posted October 21, 2009 Only a few alloys benefit from multiple hardenings though most alloys benefit from multiple temperings. What alloy are you using? Quote Link to comment Share on other sites More sharing options...
Rich Hale Posted October 21, 2009 Share Posted October 21, 2009 May help if we knew what you did to harden it,,How hot? what did you quench in? what was the temp of the quenchant?, did you normalize before hardening?, and how did you temper?...how hot and how long?..Also would help if you could tell us what the steel was.. Quote Link to comment Share on other sites More sharing options...
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