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D2, is an air-hardening, high carbon , high chromium tool steel with extremely high wear resisting properties. It is a very deep hardening steel and will be practically free from size change after proper treatment. The high percentage of chromium gives it mild corrosion resisting properties in the harden condition.
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Composition
1.5% C, 11.0–13.0% Cr; 0.45% Mn, 0.030% P, 0.030%S, 1.0% V, 0.9% Mo, 0.30% Si