2507, UNS S32750, W.Nr. 1.4410
2507 is combining high strength with exceptional corrosion resistance. In high chloride and hot environments, the material is very highly resistant to general corrosion and localised corrosion including pitting and crevice corrosion. Its duplex structure also makes its excellent resistance to stress corrosion cracking. Same as other duplex (ferritic/austenitic) grades, Super duplex 2507 is not suitable for high or low temperature service and not recommended for temperatures below -50°C or above +300°C, because of the risk of a reduction in toughness.
| Material | C | Si | Mn | P | S | Cr | Ni | N |
|---|---|---|---|---|---|---|---|---|
| 2507 | 0.30 max | 0.80 max | 1.20 max | 0.035 max | 0.02 max | 24.0-26.0 | 6.00-8.00 | 0.24-0.32 |
| Material | Tensile strength | Yield strength 0,2 | Elongation | Hardness HB30 |
|---|---|---|---|---|
| 2507 | 750 N/mm² | 550 N/mm² | 25% | 270HB |
2507 provides excellent resistance to chloride-induced localized corrosion. An indicator of excellent chloride pitting and crevice corrosion is its high Pitting Resistance Equivalent Number (PREN) etermined by the following chemical equation: (Cr%) + (Mo%) + (N%). Also, super duplex 2507 offers excellent resistance to uniform corrosion in various organic acids such as formic and acetic acids andinorganic acids containing chlorides. Compared with austenitic stainless steels such as types 304 and 316, 2507 stainless steel provides improved resistance in in high-chloride, high-temperature conditions and provides good intergranular corrosion resistance.
Duplex 2507 should be solution annealed and quenched after either hot or cold forming. Solution annealing should be done at a minimum of 1925ºF Annealing should be followed immediately by a rapid air cooling or water quench. To obtain maximum corrosion resistance, heat treated products should be pickled and rinsed.
Heating of 2507 stainless steel serves various purposes such as 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 duplex 2507, 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 duplex 2507 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: 2507 should be heated uniformly to a temperature range between 1875°F and 2250°F, to minimize the risk of thermal stress and distortion. Then use hot rolling, hot forging, hot bending and other hot forming technologies to achieve the desired shape. After the forming process, solution anneal at 1925ºF minimum and a rapid air cooling or water quench, to optimize the material's structure and properties.
Cold Forming: Compared to hot forming, the cold forming of duplex 2507 offers advantages such as improved dimensional accuracy and surface finish. Most of the common stainless steel forming methods can be used for cold working duplex 2507 stainless steel 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 2507 stainless steel than on an austenitic stainless steel.
Super duplex 2507 can be machined, although it presents some challenges due to its high strength and work-hardening tendency. Machining techniques such as tool selection, optimized cutting parameters, coolant/lubrication usage, and chip control need to be carefully considered. With appropriate tools, techniques, and cutting parameters, satisfactory machining results can be achieved, but it is advisable to consult material and tooling guidelines to ensure optimal performance.
Duplex 2507 stainless steel 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. Welding must be carried out without preheating and subsequent heat treatment is normally not necessary. When a filler metal is required, consider AWS E/ER 2509. Oxyacetylene welding is not recommended because carbon pickup in the weld may occur.
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