In the 1980s, Sandvik created SAF2507, which later became S32750 (UNS S32750, DIN 1.4410, ASTM F53). The UK company Mather & Platt created S32760 (UNS S32760, DIN 1.4501, ASTM F55) as Zeron 100 in the 1970s. Compared to Super Duplex S32750 Flanges, Super Duplex S32760 Flanges has a little greater copper and tungsten content.