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.
