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I have some old ones that are stamped 1065 on the side but dont know for certain that is designating the steel type. I have heard of some being 1050 or so also. For the ones I have made into hawks I have just heated past non mag with a short soak of a couple minutes or so and quenched in canola oil. It's a bit of a gamble when the steel is not known but so far it has worked ok for me. I usually quench only about 1 inch back from the cutting edge, then temper back.
I usually consider them around 50 points carbon. Oil is safer, but you can sometimes get a nice hamon-ish line with a water edge quench.
Draw the ball out into a cylinder first, then into straight spike, to give you something to hold on to while doing the hammer end into the hawk blade. When the blade is done, drift the eye, then shape the spike.