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ASTM A182 F304 China weld neck flanges. Standards: API5L and API5T Type: weld neck(WN) Materials: Carbon steel: ASTM A105, 20#, Q235, 16Mn, ASTM A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2, ASTM A694 F42, F46, ...