March 13, 20224 yr I have an old file that I would like to identify. The only mark on it is a 5 point star with the letters SF over CO inside the star. Anybody know which file maker used this logo? I have forged it into a knife and ready for heat treatment. Trying to determine what steel it is
March 13, 20224 yr I can't help you on the history, but Heres my thoughts on heat treating an unknown piece of steel,,, if you dont want to test a piece or spark test it. I usually assume old files and even new ones are a high carbon steel. If I'm feeling bold and brave I treat it like a W-1/1095 tool steel and water quench. Safest is assume its an O-1 and oil quench. Lol, no matter what happens, its "jest an ole piece of Iron,,,,"
March 13, 20224 yr It may help to know where in the world you are located. I imagine files made in say Europe or China have very different steel's also some of the cheapest files are just case hardened, not good knife stock. A picture of the logo may also help.
March 13, 20224 yr Should have already done the spark test getting it from a rough forged blade to ready to heat treat---what were the results?
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