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I Forge Iron

Quench and tempering Rex 49 (ANSI M4)

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I got my grandpa's tools when he passed away and I found a square stock of crucible Rex 49 what I gather from my research is that it's tool steel I was thinking of making either a hot cut chisel or a knife from it has anyone forged this steel before and know any heat treat info like air, oil, water quench and tempering and what temp for how long ECT

Title edited to reflect common name of steel


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Personally I would keep it around just as it is. I have some that I use for spacers, parallels, etc.. For hot cuts, etc you can use old axles, jackhammer bits, etc. some have used mild since it is still harder than yellow hot steel. Anything heat treated will lose the edge hardness after being in contact with forging temp steel.

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