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ASME B16.5 WN A350 LF6 Carbon Steel Forged Flange With NicePacking Or Un-standard Flange ASTM/ASME Standard A350 LF6(%) C≤0.22 Si:0.15~0.30 Mn:1.15~1.50 S≤0.025 P≤0.025 Ni≤0.40 Mo≤0.12 Cu≤0.40 Nb≤0.02 ...