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A105 Normalized Steel Forged Ring With Rough Machining Hardness Less Than 187 HB ASTM ASME Standard Composition of ASTM/ASME Standard A105 C≤0.35% Si≤0.35% Mn:0.6~1.05% S≤0.05% P≤0.04% Cu≤0.4% Ni≤0.4% ...