... steel, Alloy steel, Stainless steel Carbon SteelASTM:ASTM A234 WPB, WPC; ASTM A420 WPL9, WPL3, WPL6, WPHY-42, WPHY ... , 1.0566JIS:PA22, PA23,PA24, PA25, PL380Stainless SteelASTM:ASTM A403 WP304/304L, WP316/316L, WP321, WP347, WPS ... 1.4571JIS:SUS304, SUS304L, SUS316, SUS316L, SUS321 6.Standard: ASME B16.9, ASME B 16.28, JIS2311, JIS2312, JIS2313, ... ASME,CE,HSE Carbon Steel Weld Neck Flange ANSI B16.5