... ASME JIS BS MSS DIN SH etc.Material: stainless steel flange, duplex stainless steel flange, nickel alloy steel flange. Stainless steel: ASTM A403 WP304,304L,316,316L,321 ... 316L,321,904L,347, 904L,etc Duplex steel: ASTM A182 F51/SAF 2205/UNS S31803,F53/SAF 2507/UNS S32750, F55/UNS S32760 ... ,F904L/SAF 8904,F60/UNS S32205, etcNickel alloy steel: Alloy 20, ...