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Rough Machining Forged Steel Rings For Mechanical Manufacture 50Kg-14000Kg Forged Steel Rings Details <1>.chemical composition: C:0.43~0.5% Si:0.17~0.37% Mn:0.6~0.9% S:≤0.05% P:≤0.04% Cr:≤0.25% Ni:≤0...