UNS S32760, W.Nr. 1.4410, F55
UNS S32760 is a duplex stainless steel especially designed for service in aggressive chloride-containing environments and has additions of W and Cu compared to UNS S32750. It has very good resistance to localized corrosion and stress corrosion cracking in combination with high mechanical strength. The pitting resistance and yield strength of the S32760 material makes its allowing for leaner design in load bearing applications, widely used in various fields.
| Material | C | Si | Mn | P | S | Cr | Ni | C |
|---|---|---|---|---|---|---|---|---|
| S32760 | 0.30 max | 1.00 max | 1.00 max | 0.030 max | 0.01 max | 24.0-26.0 | 6.00-8.00 | 0.20-0.30 |
| Material | Tensile strength | Yield strength 0,2 | Elongation | Hardness HB30 |
|---|---|---|---|---|
| S32760 | 650-880 N/mm² | 450 N/mm² | 25% | 270HB |
UNS S32760 is highly resistant to corrosion by organic acids, such as formic and acetic acid, suitable for use at high concentrations and temperatures, where austenitic stainless steels corrode at a high rate. In certain concentration ranges, its resistance to inorganic acids is comparable to that of high alloy austenitic stainless steels. Compared with other duplex stainless steels of the 25Cr type, the super duplex S32760 offers stronger pitting and crevice corrosion resistance. Also, its has excellent resistance to chloride induced stress corrosion cracking, erosion corrosion and corrosion fatigue.
UNS S32760 cannot be hardened by conventional heat treatments, though this is a work hardening steel. Super duplex can be solution annealed at 1110-1140ºC, water quench, to maximize its strength and durability.
Heating of UNS S32760, a kind of super duplex stainless steel, is performed for various purposes, including heat treatment, welding, and shaping processes. For heat treatment, the material is heated to specific temperatures and held for a certain duration to achieve desired mechanical properties and improve corrosion resistance. During welding, preheating the base material and maintaining interpass temperatures help ensure proper fusion and prevent cracking. Heating is also employed in hot forming processes to enhance the material's malleability, and in brazing or soldering to join components with filler metals. Following recommended temperature ranges and procedures is essential for safe and effective heating of S32760 material, considering specific application requirements and guidelines from material manufacturers or industry standards.
Pickling is a common process used to remove surface impurities and oxide layers from super duplex UNS S32760 stainless steel. It 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 shows excellent hot formability with relatively low forming loads up. The recommended hot forming temperature range is from 1230°C to 1000°C (2250°F to 1830°F). If the temperature is too high, the dimensional stability of material will be affected and the material will become too soft for certain forming operations. If the temperature is too low, deformation accumulates in the weaker but less ductile ferrite, which can result in cracking of the ferrite in the deformed region, and large amount of sigma phase can be precipitated.
Cold Forming: Most of the common stainless steel forming methods can be used for cold working UNS S32760 to increases strength and hardness. The materials as a higher yield strength and lower ductility than the austenitic steels so fabricators may find that higher forming forces, increased radius of bending, and increased allowance for springback are necessary. Deep drawing, stretch forming, and similar processes are more difficult to perform on UNS S32760 than on an austenitic stainless steel.
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.
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