as a wall hanger, you could just use mild steel. but what little knowledge I have on the subject, they were not a high carbon steel, like 1084/95 because of rough use ( prying, opening c-rat cans, ammo crates, etc.) and when "fixed" a harder steel could fail considering it was attached to a 4' rifle, I would think that 5160 would be more of the "type" of steel that would have been used. but its your bayonet so do as you please. will be interesting to see the finished product, good luck jimmy