... steel flange, duplex stainless steel flange, nickel alloy steel flange. Stainless steel: ASTM A403 WP304, ... alloy steel: Alloy 20, Alloy 200/Nickel 200/uns s2200,alloy400/monel 400/uns s4400, alloy 600/inconel 600/uns s6600, alloy 625/inconel 625/uns s6625, alloy ... 800/incoloy 800/uns s8800, alloy 825/ incoloy 825/uns s8825,alloy ...