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Cold Rolled Hardened Spring Steel Flat Wide Applications Polished Bright 65MN Chemical composition C(%) 0.62-0.70 Si(%) 0.17-0.37 Mn(%) 0.90-1.20 P(%) ≤0.035 S(%) ≤0.035 Cr(%) 0.25max Ni(%) 0.25max ...