If you know what steel it is it would make it easier. Go with the highest grade steel that is in the billet.
Heat to non-mag and quench. ( assumming you have test quenched a piece and it is hardenable)
Draw the temper at 350dg sharpen a bit of the edge do the brass rod test if it chips, back in the oven, and up it to 400dg, do this until you get a flexible edge.
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