Alloy 2507, UNS S32750 | Super Duplex Stainless Steel
The equation is PREN = Cr + 3.3Mo + 16N. Alloy 2507 (S32750) is termed " super " duplex stainless steel since its PREN value is no less than 40, usually in the 40~45 range. Alloy 2507 also exhibits promising resistance to crevice corrosion in chloride solutions. The crevice corrosion occurs in gasket joints, under deposits and in bolted ...