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A350 LF2 Q + T Heat Treatment Forged Ring With Rough Machining Hardness Less Than 187 HB ASTM ASME Standard ASTM/ASME Standard A105 composition C≤0.30% Si:0.15~0.3 Mn:0.6~1.35% S≤0.040% P≤0.035% Cu≤0...