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EN 10085 1.8519 DIN 17211 1.8519 Forged Sleeve Forged Steel Pipe Cylinder Forging (1) 31CrMoV9 Element: Brand composition(%) C Si ≤ Mn P ≤ S ≤ Cr Mo V 31CrMoV9 0.27~0.34 0.4 0.4~0.7 0.025 0.035 2.3~2...