Dross Posted June 26, 2009 Share Posted June 26, 2009 OK so I'm finishing off my first railroad spike knife, and I know that the metal is to soft to hold an edge for long. Any hints on how to temper the edge with a propane torch? Quote Link to comment Share on other sites More sharing options...
Finnr Posted June 26, 2009 Share Posted June 26, 2009 Don't temper just harden. Still a fancy letter opener but a wee bit better. Finnr Quote Link to comment Share on other sites More sharing options...
jimmy seale Posted June 26, 2009 Share Posted June 26, 2009 makea soulition of salt water...cold and "harden" bout the best ya can do for that steel Quote Link to comment Share on other sites More sharing options...
Dross Posted June 26, 2009 Author Share Posted June 26, 2009 Thanks guys. Quote Link to comment Share on other sites More sharing options...
ThomasPowers Posted June 26, 2009 Share Posted June 26, 2009 Don't know if a propane torch will be enough, you need to heat the blade till it's glowing, slightly above the temperature where a magnet will lose it's attraction to it and then quench in cold salt water. This will harden it. Probably not need much tempering but if you want to I would ssuggest 325 deg F in a kitchen oven for 1 hour. Quote Link to comment Share on other sites More sharing options...
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