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butt welded ASTM A234 WPB elbow specifications 1.Standard: ASME/ANSI B16.9, B16.11, B16.28, B16.5; MSS SP-43, 83, SY/T051-1998, SY5257-91 2.Size: 1/2" ~ 48"( Seamless); 16" ~ 72"(Welded) 3.Wall ...