Sandvik SAF 2507® is a super-duplex (austenitic-ferritic) stainless steel for service in highly corrosive conditions. The grade is characterized by excellent resistance to stress corrosion cracking (SCC) in chloride-bearing environments, excellent resistance to pitting and crevice corrosion, high resistance to general corrosion, very high mechanical strength, physical properties that offer design advantages, high resistance to erosion corrosion and corrosion fatigue and good weldability.
The standards are: UNS: S32750, EN Number: 1.4410, EN Name: X 2 CrNiMoN 25-7-4 and SS: 2328.
The product standards are: Seamless tube and pipe: EN 10216-5, Seamless and welded tube and pipe: ASTM A789; A790, Flanges: ASTM A182, Fittings: ASTM A182; (ASTM A815 applied for), Plate, sheet and strip: ASTM A240, EN 10088-2, Bar steel: ASTM A479, EN 10088-3 and Forged billets: EN 10088-3.
It is approved by the American Society of Mechanical Engineers (ASME) for use in accordance with ASME Boiler and Pressure Vessel Code, Section VIII, div. 1. There is no approval for UNS S32750 in the form of plate. However, according to ASME paragraph UG-15, the design values for seamless tube according to ASME Section VIII, div. 1 are also allowed to be used for plate.
