With an unknown metal. heat to non-magnetic, quench in warm to the touch oil Test with file to see if it is hard, if not and sure it was non-mag, then redo the hardening process, using water rather than oil. We warm the quench liquid because thermal transfer if better than room temp would be.
after you are sure it hardened, place in oven at around 350F to 375F for 2 hours (you can add a frozen pizza so the wife isn't upset at the oven being on), ou can temper higher but I suggest a 2 stage temper, this is the stress refeif. dont wait to temper because it may crack while you are waiting.
IF you plan on heavy abuse to this, like hitting it with a hammer, I suggest using a torch heat the hammer contact side to high temp to soften this end a bit more, which should help to prevent chipping. Do not allow the cutting side to get hot. The easy way that I do this is to place the cutting edge into about 1 inch of water, while you heat the other exposed end. Heat the contact end to blule or purple.