O-1

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O-1 is a tool steel that consists of:

Carbon Chromium Cobalt Copper Manganese Molybdenium Nickel Nitrogen Phosphorus Silicon Sulfur Tungsten Vanadium
0.85-1.00 0.40-0.60 / / 1.00-1.40 / 0.30 / / 0.50 / 0.50 0.30

O-1 is a very good cold work steel and also makes very good knives. It can be hardened to about 57-61 HRC.