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Cold Drawn 40Cr Steel Round Bar ASTM SAE 5140 Steel Rod JIS G4104 SCr440 Tool For Making Shaft 1,Chemical composition(%): C Si Mn S P Cr Ni Cu 0.37-0.44 0.17-0.37 0.70-0.90 <=0.040 <=0.035 0.80-1.10 <...