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EN24/4340/1.6511 alloy tool steel bar for shaft with diameter 20-100mm Chemical composition(%) C Si Mn S P Cr Mo Ni 0.37~0.44 0.15~0.35 0.5~0.8 ≤0.035 ≤0.035 0.60~0.90 0.15~0.25 1.25~1.65 Application: ...