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Features: 1) Material: ASTM A105 ASTM A350 LF2 ASTM A516 Gr60, Gr65, Gr70, ASTM A182 F304, F304L, F316, F316L ASTM A182 F51, F53 ASTM A182 F11, F22 2) Specification: ANSI B16.48, API 6A, Norsork L005 ...