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P20 1.2311 Plastic Mould Steel Plate thickness 10-300mm CHEMICAL COMPOSITION CHEMICAL COMPOSITIONS(%) C Si Mn P S Cr Mo W V Ni Other 0.20-0.40 0.20-0.80 0.60-1.00 ≤0.030 ≤0.030 1.40-2.00 0.30-0.55 - - ...