Ok. Here is what I did. 1/8" 5160 steel, ground to 120 grit. Heatted in my gas forge till it was a light orange color (mid afternoon with overcast skies.) Let soak for 5-8 min, quenched in peanut oil. Did that twice and checked with file. File cut very nice. Not hard. Repeat a third time with same results. One idea was that I over cooked it. And to top it off, they warped! I can deal with the warp, but I do not know what I did with the hardness.