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A pre number that is approximately 40 or higher There are different grades of standard duplex and super duplex materials. These grades are roughly equal to the 6%mo super austenitic grades in their resistance to localised chloride attack and they are often used for applications that involve seawater exposure, chemical process, pollution control, acid leach minin
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The increase of chromium enhances the alloys’ oxidation and corrosion resistance, while greater nickel improves toughness and ductility. Since the super duplex material has more chromium, nickel and molybdenum content, it is expensive than the standard duplex grades Super duplex, meanwhile, contains 25% chromium, 7% nickel and 4% molybdenum
The higher levels of these elements is what gives super duplex its enhanced resistance to corrosion against duplex stainless steel.
Uns s32750, often referred to as alloy 2507, is one of the most common super duplex stainless steel grades This high molybdenum, chromium and nitrogen contents provide excellent resistance to chloride pitting and crevice corrosion attack and the duplex structure provides 2507 with exceptional resistance to chloride stress corrosion cracking. With even more chromium, molybdenum, and nitrogen than standard duplex, this grade offers excellent resistance to pitting and crevice corrosion, making it suitable for highly corrosive environments, such as those encountered in the marine and chemical processing industries.
