Super Duplex UNS S32760 /F55 Flanges are made up of the super duplex grade of stainless steel. The material has 24% chromium, 6% nickel, 3% molybdenum, copper, tungsten, carbon, nitrogen, manganese, silicon, phosphorus, iron and sulfur. The ASTM A182 F55 Flange has high strength and high corrosion resistance. The flanges are made under ANSI Ba6.5, ANSI B16.47 and other international standards.