Alloy 32760 is a super duplex stainless steel supplied in the hot worked and solution annealed condition. As a super duplex stainless steel, it combines the desirable aspects of both austenitic and ferritic grades. The higher chromium, molybdenum and nitrogen contents result in a Pitting Resistance Equivalent number (PREN) of >40, providing pitting and crevice corrosion resistance superior to austenitic and duplex stainless steels in almost all corrosive media, and a Critical Pitting Temperature exceeding 50°C nb.versions of the PREN formula also include W as a positive influence on overall pitting resistance.
It provides higher strength than both austenitic and 22% Cr duplex stainless steels, and is listed in NACE MR 0175 for sour service and ASME for pressure vessel applications.
SuperDuplex stainless steel – with a microstructure of 50:50 austenite and ferrite, the steel has improved strength over ferritic and austenitic steel grades. With a higher than average Molybdenum and Chromium content, the material has greater heat and corrosion resistant qualities.
With reduced production costs when compared with equivalent austenitic and ferritic grades and with greater yield and tensile strength, SuperDuplex is a cost effective solution for the consumer. It is conceivable that material thicknesses for a project may be reduced if SuperDuplex is used, thus reducing cost without compromising quality.
Benefits of UNS S32760 SuperDuplex Stainless Steel
- Increased tensile & yield strength
- Good ductility and toughness
- SSC resistance
- Corrosion resistance is better than Duplex
- Cost effective
Applications
UNS S32760 is used in the oil and gas industry, on offshore platforms, in heat exchangers, chemical processing equipment, pressure vessels and boilers.
- Process industry components in nitric acid, dioxide, polypropylene & PVC production, caustic
- Equipment handling organic & fatty acids
- Marine industry and shipbuilding propellers, shafts, rudders, shaft seals, pumps, bolts, fasteners, valves, instrumentation
- Oil and chemical tankers
- Oil & Gas industry pumps, valves, pipe, vessels, wellhead equipment, subsea equipment
- Pollution control systems, fans and pumps, wet scrubbers, incinerators, flue gas desulphurisation (FGD)
- Pulp & paper industry components such as black liquor heater tubes, digester blow valves, rotary feed valves, I.D.fans, brownstock washers, precipitators, bleaching components
- Food Industry applications including sugar cane centrifuges, corn and vegetable processing plant
- Agrochemicals production such as fertilisers (based on wet phosphoric acid)
- Sewage treatment, seawater cooling, desalination plants
Chemical Composition of S32760
| UNS No | S32750 |
|---|---|
| EN | 1.441 |
| AISI | 2507 |
| Carbon (C) | 0.03 |
| Silicon (Si) | 0.8 |
| Manganese (Mn) | 1.2 |
| Phosphorus (P) | 0.035 |
| Sulphur (S) | 0.02 |
| Chromium (Cr) | 24.0/26.0 |
| Molybdenum (Mo) | 3.0/3.5 |
| Nickel (Ni) | 6.00/8.00 |
| Nitrogen (N) | 0.24/0.32 |
| Other | Cu: 0.50 |
Physical properties of UNS S32760
| Density (Kg/m3) | 7810 |
|---|---|
| Magnetic Permeability (20°C) | 33 |
| Young’s Modulus (kN/mm2) | 199 |
| Specific Electrical Resistance, 20°C (µΩ.m) | 0.8 |
| Mean coefficient of thermal expansion, 20-300°C (m/m/oC) | 11.1 x 10-6 |
| Specific Heat, 20°C (J/kg.K) | 475 |
| Thermal conductivity, 20°C (W/m.K) | 14.2 |
| Fracture Toughness, kQ (MPa/m2) | 98 |