UNS S32760 is a tungsten and copper-alloyed super duplex stainless steel offering enhanced corrosion resistance compared to standard 25Cr super duplex grades. With additions of tungsten (0.5-1.0%) and copper (0.5-1.0%), it achieves a PRE (Pitting Resistance Equivalent) ≥ 40 while providing excellent resistance to crevice corrosion, stress corrosion cracking, and erosion in seawater and sour service environments. This grade combines high mechanical strength (yield strength ≥ 550 MPa) with good ductility and sub-zero toughness down to -50°C, making it the preferred material for subsea pipework, desalination plants, and high-pressure oil & gas equipment .
1. Product Specifications & Physical DataZYTC Alloy supplies Super Duplex 2760 (UNS S32760) in bar and forging stock for critical applications requiring verified corrosion resistance and mechanical properties. Available Forms: Bar (6mm - 270mm diameter), forging stock, plate, pipe, tube, and fittings . Specifications: UNS S32760, EN 10088-3 1.4501 (X2CrNiMoCuWN25-7-4), ASTM A182 F55, NORSOK MDS D51-D58, NACE MR0175/ISO 15156 .
| Chemical Composition (Weight %) | Super Duplex 2760 Specification |
|---|
| Chromium (Cr) | 24.0 - 26.0 | | Nickel (Ni) | 6.0 - 8.0 | | Molybdenum (Mo) | 3.0 - 4.0 | | Tungsten (W) | 0.5 - 1.0 | | Copper (Cu) | 0.5 - 1.0 | | Nitrogen (N) | 0.20 - 0.30 | | Carbon (C) | 0.030 max. | | Manganese (Mn) | 1.0 max. | | Silicon (Si) | 1.0 max. | | Phosphorus (P) | 0.030 max. | | Sulfur (S) | 0.010 max. | | Iron (Fe) | Balance |
| Physical Properties | Metric | Imperial |
|---|
| Density | 7.8 g/cm³ | 0.281 lb/in³ | | Modulus of Elasticity | 200 GPa | 29.0 × 10⁶ psi | | Thermal Conductivity | 15 W/m·K | 104 BTU·in/hr·ft²·°F | | Coefficient of Expansion (20-100°C) | 13.0 µm/m·°C | 7.2 µin/in·°F |
| Mechanical Properties (Minimum) | Metric | Imperial |
|---|
| Tensile Strength | 860 MPa | 125 ksi | | Yield Strength (0.2% offset) | 550 - 620 MPa | 80 - 90 ksi | | Elongation | 16% | 16% | | Hardness (Brinell) | 270 max. | 270 max. | | Impact Strength (Charpy V, -50°C) | 40 J | 29.5 ft·lbf |
2. Fabrication & Material ComparisonHeat Treatment: Solution anneal 1100-1140°C (2012-2084°F), water quench; rapid cooling essential to maintain phase balance and prevent sigma phase formation . Welding: Good weldability with controlled heat input; matching super duplex filler metals (with W and Cu) required to maintain corrosion resistance . Forming: Higher strength requires more powerful equipment; good cold formability with appropriate allowances for springback . Machining: Higher cutting forces than standard duplex; requires rigid setups, sharp tools, and adequate coolant . Material Comparison: vs. Super Duplex 2507 (S32750): Tungsten and copper additions provide enhanced corrosion resistance in specific environments; comparable strength . vs. Duplex 2205: Higher alloy content provides superior pitting resistance (PRE 40+ vs. 35) and strength . vs. 254 SMO: Higher strength; comparable pitting resistance with better SCC performance . vs. Alloy 625: Lower cost alternative for many applications; excellent corrosion resistance at significant cost savings .
3. ApplicationsOil & Gas: Subsea pipework systems, manifolds, flowlines, Christmas trees, valves, pumps Desalination: High-pressure RO plants, seawater intake systems, evaporators Marine: Seawater cooling systems, propeller shafts, pump components, heat exchangers Chemical Processing: Centrifuges, agitators, reactors, vessels for aggressive media Power Generation: Flue gas desulfurization (FGD) plants, scrubbers, absorber towers Pressure Vessels: Storage tanks, pressure vessels for corrosive service Offshore Platforms: Process equipment, fire-fighting systems, ballast water systems
Contact ZYTC Alloy for certified Super Duplex 2760 (UNS S32760) materials with complete traceability, ASTM/EN/NORSOK specifications, technical datasheets, and competitive pricing on standard bar sizes or custom-forged components. Email: daisy@zytcsteel.com WhatsApp/WeChat: +86 17335753350 |
