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Apr 3 2024UNS S32760 (W.Nr. 1.4410, F55) is a type of duplex stainless steel that is specifically engineered to withstand harsh environments containing chloride. It contains additional elements like tungsten (W) and copper (Cu) compared to UNS S32750. This particular steel exhibits excellent resistance to localized corrosion and stress corrosion cracking, while also possessing high mechanical strength. Due to its exceptional pitting resistance and high yield strength, S32760 enables more efficient and lightweight designs in load-bearing applications. As a result, it finds extensive usage across diverse fields.
Marine Industry and Shipbuilding: Propellers, shafts, rudders, shaft seals, pumps, bolts, fasteners, valves, instrumentation
Oil & Gas: Pumps, valves, pipe, vessels, wellhead equipment, subsea equipment
Pollution Control Systems: Fans and pumps, wet scrubbers, incinerators, flue gas desulphurisation (FGD)
Pulp & Paper Industry: Black liquor heater tubes, digester blow valves, rotary feed valves, I.D.fans, brownstock washers, precipitators, bleaching components
Food Industry: Sugar cane centrifuges, corn and vegetable processing plant
Agrochemicals Production: Components in nitric acid, dioxide, polypropylene & PVC production, caustic evaporators
|
Material |
C |
Si |
Mn |
P |
S |
Cr |
Ni |
N |
|
S32760 |
0.30max |
1.00max |
1.00max |
0.030max |
0.01max |
24.0-26.0 |
6.00-8.00 |
0.20-0.30 |
|
Material |
Tensile strength |
Yield strength 0,2 |
Elongation |
Hardness HB30 |
|
650-880N/mm² |
450N/mm² |
25% |
270HB |
UNS S32760 demonstrates remarkable resistance to corrosion caused by organic acids, including formic and acetic acid, even at elevated concentrations and temperatures. This makes it suitable for applications where austenitic stainless steels would corrode rapidly. In certain concentration ranges, its resistance to inorganic acids is comparable to that of highly alloyed austenitic stainless steels. When compared to other duplex stainless steels with a chromium content of 25%, the super duplex S32760 surpasses them in terms of superior resistance to pitting and crevice corrosion. Additionally, it exhibits excellent resistance to chloride-induced stress corrosion cracking, erosion corrosion, and corrosion fatigue.
UNS S32760, despite being a work-hardening steel, cannot be hardened through conventional heat treatments. However, it can undergo a solution annealing process to optimize its strength and durability. This involves heating the material to a temperature range of 1110-1140ºC and then rapidly quenching it in water. This solution annealing treatment helps maximize the material's mechanical properties and enhance its overall performance.
Heating is a necessary step when working with UNS S32760, a type of super duplex stainless steel, for various purposes such as heat treatment, welding, and shaping processes. Heat treatment involves subjecting the material to specific temperatures and durations to achieve desired mechanical properties and enhance corrosion resistance. During welding, preheating the base material and maintaining interpass temperatures are important to ensure proper fusion and prevent cracking. Heating is also employed in hot forming processes to improve the material's malleability, as well as in brazing or soldering to join components using filler metals. It is crucial to follow recommended temperature ranges and procedures for the safe and effective heating of S32760, considering specific application requirements and guidelines provided by material manufacturers or industry standards.
Pickling is a commonly employed method to eliminate surface impurities and oxide layers from super duplex UNS S32760 stainless steel. This process involves immersing the material in a pickling solution, typically an acid-based solution, to dissolve contaminants and restore the material's corrosion resistance.
Hot Forming: UNS S32760 exhibits excellent hot formability with relatively low forming loads. The recommended temperature range for hot forming is between 1230°C to 1000°C (2250°F to 1830°F). It is important to avoid excessively high temperatures as it can affect the dimensional stability of the material and make it too soft for certain forming operations. Conversely, if the temperature is too low, deformation can accumulate in the weaker but less ductile ferrite phase, leading to cracking in the deformed region and the precipitation of a large amount of sigma phase.
Cold Forming: UNS S32760 can be cold worked using most common stainless steel forming methods to increase its strength and hardness. However, it should be noted that this material has higher yield strength and lower ductility compared to austenitic steels. As a result, fabricators may need to apply higher forming forces, use increased bending radii, and allow for greater springback. Deep drawing, stretch forming, and similar processes can be more challenging to perform on UNS S32760 compared to austenitic stainless steels.
UNS S32760 can be machined using appropriate techniques and tools. However, it is important to consider that super duplex S32760 stainless steel has higher strength and hardness compared to conventional austenitic stainless steels, which can present challenges during machining.
UNS S32760 possesses good weldability and can been welded by by shielded metal arc welding, gas tungsten arc welding, plasma arc welding, flux cored wire, submerged arc welding, or other standard welding processes. Preheating of super duplex S32760 is not necessary except to prevent condensation on cold metal. When a filler metal is required, consider S32760/P100, because it will produce the appropriate duplex weld structure.
Ø Bar & Rod
Ø Plate & Sheet
Ø Coil & Strip
Ø Pipe & Tube
Ø Fitting: Flange, Tee, Elbow, Reducer etc.
Ø Forging: Ring, Shaft, Circle, Block etc.
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