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Super Duplex stainless steel S32760 (UNS S32760, DIN 1.4501, ASTM F55) was originally developed as Zeron 100 by the UK company Mather & Platt in the 1970s. It contains a slightly higher copper and tungsten content compared with S32750. UNS S32760 contains 25% chromium, 7% nickel, 3.6% molybdenum as well as copper, tungsten, and nitrogen. This is a super duplex grade with a ferritic-austenitic microstructure.
Stainless steel grade F55 has excellent corrosion resistance to a wide range of areas, especially resistance to pitting and crevice corrosion in seawater and other chloride containing environments, with critical pitting temperature that is more than 50°C (122°F). This material is known to also have high strength and extended lifecycle. It is 10% lighter than grade 316 steel, ideal for sub-zero service, and more cost effective than nickel alloys. Stainless steel grade F55 can be easily machined and welded.
Grade | C≤ | Si≤ | Mn≤ | P≤ | Cr | Ni | S≤ | N | Cu | Mo | W |
S32760 | 0.03 | 1.0 | 1.0 | 0.03 | 24.0-26.0 | 6.0-8.0 | 0.01 | 0.2 -0.3 | 0.5-1.0 | 3.0-4.0 | 0.5-1.0 |
Grade | Tensile, min, ksi[MPa] | Yield, min, ksi[MPa] | Elongation, %(min) | Hardness, HB（max） |
S32760 | 108 [750] | 80 [550] | 25 | 310 |
Density: 8.8 g/cm3
Super Duplex stainless steel S32760 Equivalent Grades
STANDARD | WERKSTOFF NR. | UNS | EN |
Super Duplex S32760 | 1.4501 | S32760 | X2CrNiMoCuWN25-7-4 |
Super Duplex stainless steel S32760 ASTM Specifications
Pipe | Tube | Sheet/Plate | Bar /Rod | Forging /Flange | BW Fittings |
ASTM A790 | ASTM A789 | ASTM A240 | ASTM A276/A479 | ASTM A182 | ASTM A815 |
Super Duplex stainless steel S32760 Application：
Desalination plants
Seawater systems
Heat exchangers
Subsea pipework systems
Flue gas desulphurisation (FGD) plants
Centrifuges and agitators
Storage tanks and pressure vessels
