... Carbon steel, Alloy steel, Stainless steel Carbon SteelASTM:ASTM A234 WPB, WPC; ASTM A420 WPL9, WPL3, WPL6, WPHY-42, WPHY ... .0,St35.8,St45.8JIS:PG370, PT410, SS400Alloy SteelASTM:ASTM A234 WP1, WP11, WP12, WP22, WP5, WP9, ... 0488, 1.0566JIS:PA22, PA23,PA24, PA25, PL380Stainless SteelASTM:ASTM A403 WP304/304L, WP316/316L, WP321, WP347, WPS 31254DIN ... ,ASME,CE,HSE Carbon Steel Weld Neck Flange ANSI B16.5