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I Forge Iron

Heat treatment of a File for a plane blade


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The problem with some hoof rasps is they can be case hardened.This means that to re-harden it would require some form of case hardening. Here is hoping you have a HC steel rasp. I would first try a quench from non-magnetic in warm oil, tranny fluid or even used crank case oil may work well. If it does not harden in the oil then use brine. If you have a piece of the rasp remaining then do some testing on it rather than risk the blade. Good luck

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