2507 Super Duplex Stainless Steel
2507 is a ferritic austenitic duplex stainless steel identified as UNS S32750 and EN 1.4410. It contains 24% to 26% chromium, 6% to 8% nickel, 3% to 5% molybdenum, and 0.24% to 0.32% nitrogen. Its duplex structure combines high strength with resistance to chlorides, seawater, sulfuric acid, hydrochloric acid, organic acids, and alkaline media. The source lists long term service below 600℃, high toughness, fatigue resistance, good weldability, and carbon limited to ≤0.03% for resistance to intergranular corrosion.
Product details
Chemical composition
| Duplex 2507 | C | Si | Mn | P | S | Ni | Cr | Mo | Cu | N |
|---|---|---|---|---|---|---|---|---|---|---|
| min | – | – | – | – | – | 6.0 | 24.0 | 3.0 | – | 0.24 |
| max | 0.03 | 0.8 | 1.2 | 0.035 | 0.02 | 8.0 | 26.0 | 5.0 | 0.5 | 0.32 |
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Grade equivalents
| English Item | UNS | W.Nr. | JIS | GB/T | Other Grades |
|---|---|---|---|---|---|
| Duplex 2507 | S32750 | 1.4410 | NAS74N | 022Cr25Ni7Mo4N | X2CrNiMoN25-7-4 |
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Physical properties
| Density g/cm³ | 7.98 |
|---|---|
| Melting range ℃ | 1300-1390 |
| Thermal conductivity (100℃) λ/(W/m•℃) | 17 |
| Specific heat J/kg•℃ | 287 |
| Elastic modulus GPa | 200 |
| Electrical resistivity μΩ•m | 0.8 |
| Linear expansion coefficient a/10-6℃-1 | 13 |
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Mechanical properties
| Tensile strength Rm N/mm | ≥795 |
|---|---|
| Yield strength RP0.2 N/mm | ≥550 |
| Elongation % | ≥15 |
| Hardness HB | ≤310 |
| *After solution heat treatment | |
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Applications
- Oil and gas production: downhole equipment, oil and gas pipelines, and offshore-platform structures exposed to hydrogen sulfide or brine
- Chemical processing: reactors, heat exchangers, and storage tanks handling strong acids, alkalis, and chloride media
- Seawater desalination: high-pressure reverse-osmosis equipment and seawater piping requiring chloride-corrosion resistance
- Environmental engineering: waste-incineration flue gas desulfurization units and wastewater treatment equipment exposed to hot, humid corrosion
- Marine engineering: offshore-wind foundations, seawater treatment systems, and ship components exposed to seawater
- Food and pharmaceutical processing: hygienic, corrosion-resistant food-processing equipment and pharmaceutical piping
- Power generation: flue gas desulfurization systems at thermal power plants and auxiliary nuclear-power equipment requiring intergranular-corrosion resistance
Available product forms
- Round Bar
- Wire
- Forgings
- Plate
- Strip
- Seamless Pipe
- Welded Pipe
- Capillary Tube
- Flanges
- Pipe Fittings
- Non-standard Custom Parts
Values follow the Milike materials catalogue and are provided for preliminary review. Confirm the applicable purchase specification, heat treatment condition, and inspection requirements before final material selection.
- Heat and batch traceability
- PMI testing available
- Cut-to-size processing
- Material certificates on request
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