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P20 / 1.2311 Pre-hardened Hot Rolled Plastic Mold Steel Big Plate Chemical Composition(%) Grade C Si Mn S P Cr Mo 1.2311 0.28-0.40 0.20-0.80 0.6-1.00 ≤0.030 ≤0.030 1.40-2.00 0.30-0.55 Equivalent ...