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Speical Alloy Tool Mould Die Steel Alloy Steel Plate 1.7225 4140 SCM440 Hot Rolled Black Surface ► Chemical Composition(%): C Si Mn Cr P S Mo 0.38-0.45 0.17-0.37 0.50-0.80 0.90-1.20 ≤0.035 ≤0.035 0.15...