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Super Duplex UNS S32760 Round Bar Supplier in Mumbai, India
Nicorex Alloys is an ISO 9001 and ISO 14001 certified stockist and supplier of super duplex bar and rod products, based in Mumbai, India. We provide S32760 round bar manufactured to ASTM A276, ASTM A479, and ASME SA276/SA479. UNS S32760 is also designated as F55 (forging grade per ASTM A182), Zeron 100 (Rolled Alloys), Alloy 32760, and Werkstoff Nr. 1.4501.
UNS S32760 is a tungsten and copper-bearing super duplex stainless steel with a balanced austenitic-ferritic microstructure. Key alloying elements include 24-26% chromium, 6-8% nickel, 3-4% molybdenum, with intentional additions of tungsten (0.5-1.0%), copper (0.5-1.0%), and nitrogen (0.20-0.30%). The tungsten and copper additions are what make S32760 a reliable option for crevice corrosion resistance in stagnant seawater, while copper improves performance in reducing acids. The extended PREN formula yields a value of ≥40, confirming super duplex status. Impact toughness holds strong at sub-zero temperatures down to -46°C.
S32760 mechanical properties per ASTM A276 include a minimum yield strength of 550 MPa (80 ksi) and a minimum tensile strength of 750 MPa (109 ksi). Diameters range from 6 mm to 350 mm in round, hex, flat, square, bright, and black bar forms, with lengths from 1 to 6 metres (custom cut available). All bars ship in solution-annealed condition. Standards include ASTM A276, A479, A182 F55, EN 10088-3, NACE MR0175, and NORSOK MDS D54/D57. Applications range from subsea oil and gas, shipbuilding, chemical plants, power stations, and pollution control, because of the alloy’s high corrosion resistance and structural integrity.
Super Duplex Steel UNS S32760 Round Bar Specifications
| Standards | ASTM A276, A479, ASME SA276, SA479 |
|---|---|
| Forging Grade | ASTM A182 F55 |
| Diameter | 6 mm – 350 mm |
| Length | 1 – 6 metres, custom cut |
| Forms | Round, Hex, Flat, Square, Bright, Black |
| Finish | Hot Rolled, Cold Drawn, Centreless Ground, Peeled |
| Condition | Solution Annealed |
Chemical Composition of UNS S32760 Round Bar
| Element | Carbon (C) | Manganese (Mn) | Silicon (Si) | Phosphorus (P) | Sulphur (S) | Chromium (Cr) | Nickel (Ni) | Molybdenum (Mo) | Nitrogen (N) | Tungsten (W) | Copper (Cu) | Iron (Fe) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Percentage (%) | 0.030 max | 1.00 max | 1.00 max | 0.030 max | 0.010 max | 24.0-26.0 | 6.0-8.0 | 3.0-4.0 | 0.20-0.30 | 0.50-1.00 | 0.50-1.00 | Balance |
Mechanical Properties of F55 Bar
| Property | Tensile Strength (min) | Yield Strength 0.2% (min) | Elongation (min) | Hardness (max) | Impact Toughness (typical, -46°C) |
|---|---|---|---|---|---|
| Value | 750 | 550 | 15 | 310 | 45 |
| Unit | MPa (109 ksi) | MPa (80 ksi) | % | HBW (32 HRC) | J (Charpy V-notch) |
Super Duplex S32760 (Zeron 100) Round Bar Equivalent Grades
| Standard / System | UNS | Werkstoff Nr. | EN | AFNOR | ASTM (Bar) | ASTM (Forging) |
|---|---|---|---|---|---|---|
| Designation | S32760 | 1.4501 | X2CrNiMoCuWN25-7-4 | Z3CND25.06Az | A276, A479 | A182 F55 |
Physical Properties of Super Duplex S32760 Bar
| Property | Density | Melting Range | Thermal Conductivity (20°C) | Specific Heat | Electrical Resistivity | Thermal Expansion (20-100°C) | Elastic Modulus |
|---|---|---|---|---|---|---|---|
| Value | 7.8 | 1350-1450 | 14.0 | 470 | 0.85 | 13.0 × 10⁻⁶ | 190 |
| Unit | g/cm³ | °C | W/m·K | J/kg·K | µΩ·m | /°C | GPa |
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Available Forms of F55 Bar and Rod
UNS S32760 Round Bar
Duplex Steel UNS S32760 Rod
UNS S32760 Bright Bar
Super Duplex S32760 Flat Bar
F55 Alloy Square Bar
Machining, Welding, and Fabrication of UNS S32760 Bar
S32760 is machinable but work-hardens rapidly. It employs rigid machining setups, positive-rake carbide inserts, and flood cooling. Cutting speeds need to be reduced by 40-50% compared to 316L to account for the increased yield strength and strong work hardening rate
For welding, use ER2594 or matching Zeron 100X filler. GTAW or SMAW are preferred. Heat input: 0.5-2.0 kJ/mm. No preheat needed above 0°C. Interpass temperature: 150°C max. Hot work at 1100-1230°C; do not work below 1000°C. Solution anneal at 1100-1140°C followed by rapid water quench.
Post-fabrication testing per ASTM G48A: no pitting at 50°C, weight loss < 4.0 g/m². Ferrite content in weldments: 35-55% per ASTM E562.
Industries and Applications for F55 Round Bar
- Tungsten and copper additions in S32760 make this bar grade suited to stagnant or low-velocity seawater and aggressive acid mixtures.
- Christmas tree bodies, subsea manifold connector bolts, downhole tool components, choke valve stems. NORSOK MDS D54/D57 and NACE MR0175 compliant. Originally developed for North Sea pump service.
- Industries that produce propeller shafts, rudder stocks, shaft seals, and seawater pump impeller shafts. S32760 bar resists crevice corrosion in stagnant seawater better than S32750 due to its tungsten content.
- Reactor stirrer shafts, heat exchanger tie rods, and pressure vessel studs in nitric acid, dioxide, and polypropylene production.
- Fan shafts, wet scrubber fasteners, and flue gas ducting bolts exposed to sulphuric acid condensate.
- Black liquor heater studs, digester blow valve shafts, and bleach plant bolting in chlorine dioxide service.
- Turbine shaft components, penstock fasteners, and cooling water pump shafts in power station environments.
How to Order Super Duplex Steel S32760 Round Bar from Nicorex Alloys
Kindly provide following 10 details to place an order for Super Duplex Steel S32760 Round Bar
- Bar Form - Round bar, hex bar, flat bar, square bar, bright bar, rod
- Grade and UNS - S32760, F55, Zeron 100
- Applicable Standard - ASTM A276, A479, NORSOK MDS D54
- Diameter and length - In mm or inches
- Surface Finish - Hot rolled, cold drawn, bright, peeled
- Condition - Solution Annealed / Solution Treated & Precipitation Hardened
- Quantity - number of pieces, kg, or MT
- Test Certificates Required - EN 10204 3.1/3.2, NACE, PMI, ASTM G48A report
- Additional testing - Impact at -46°C, ferrite count, IGC test
- NORSOK compliance requirements if applicable
Frequently Asked Questions
What is Zeron 100 and How Does it Relate to S32760?
Zeron 100 is the trade name originally developed by Mather & Platt (later Weir Pumps) for UNS S32760 super duplex steel. The trademark is now held by Rolled Alloys Inc. All S32760 bar meeting ASTM A276/A479 is equivalent to Zeron 100 in chemical and mechanical terms.
Is S32760 Round Bar Qualified for NORSOK Applications?
Yes. S32760 bar qualifies under NORSOK M-650 data sheets MDS D54 (solution annealed) and MDS D57 (hot finished). Qualification requires ASTM G48A testing at 50°C with no pitting and weight not exceeding 4.0 g/m², plus ferrite content between 35-55%.