SUS 310

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SUS 310 is martensitic stainless steel that is designed for high temperature service and excellent oxidation resistance at normal temperatures. It's a general use steel which Spyderco uses as cladding for higher-performance, but less corrosion resistant, steels. It isn't very hard, so scratches easily.

SUS 310 consists of:

Carbon Chromium Cobalt Copper Manganese Molybdenium Nickel Nitrogen Phosphorus Silicon Sulfur Tungsten Vanadium
0.25 24.00-26.00 / / 2.00 / 19.00-22.00 / 0.045 1.50 0.03 / /