Butt welding Fitting Standard: ANSI B 16.9, ANSI B 16.28, MSS SP-43, MSS SP-75 Material quality: Carbon steel ASTM A234 WPB, WPC; ASTM A420 WPL1, WPL3, WPL6, WPHY-42, 46, 52, 56, 60, 65, 70 Stainless steel ASTMA403WP304/304L, WP316/316L, WP321, WP347, WPS31254, 304/304L/304H, 304N1, 304N2,...