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ASTM ASME SA355 P22 Hot Forged Ring Forged Disc Flange Heat treatment And Proof Machined ASTM/ASME SA355P22 1. Chemical elements: C:0.05~0.15% Si≤:0.5% Mn:0.3~0.6% S≤0.025% P≤0.025% Cr:1.9~2.6% Mo:0...