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Super Duplex S32750 (F53) Round Bar Supplier in Mumbai, India – ASTM A276 UNS S32750
Nicorex Alloys is an ISO 9001 and ISO 14001 certified supplier, stockist, and trading company based in Mumbai, India, specialising in super duplex stainless steel bar and rod products. We supply S32750 (F53) round bar according to ASTM A276, ASTM A479, and ASME SA276/SA479 specifications.
UNS S32750 is also designated as F53 (forging grade per ASTM A182), SAF 2507 (Sandvik), Alloy 2507, and Werkstoff Nr. 1.4410. Mill test certificates per EN 10204 3.1 accompany each shipment. S32750 is a super duplex stainless steel with an austenitic-ferritic dual-phase microstructure (approximately 50:50 ratio). It is designed for aggressive chloride environments. Key alloying elements include 25% chromium, 7% nickel, 3–5% molybdenum, and controlled nitrogen additions of 0.24–0.32%. The PREN value reaches approximately 42, which exceeds the >40 threshold required for super duplex classification. This delivers superior pitting and crevice corrosion resistance in seawater and chloride-bearing process media.
S32750 mechanical properties as per ASTM A276 include a minimum yield strength of 550 MPa (80 ksi), minimum tensile strength of 795 MPa (115 ksi), and hardness up to 310 HBW. 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). The S32750 round bars are known for their high strength and excellent corrosion resistance, making them ideal for industries like offshore oil and gas, chemical processing, desalination, marine engineering, and power generation.
Super Duplex 2507 Bar Specifications
| Standards | ASTM A276, A479, ASME SA276, SA479 |
|---|---|
| Forging Grade | ASTM A182 F53 |
| Diameter | 6 mm – 350 mm |
| Length | 1 – 6 metres, custom cut |
| Forms | Round, Hex, Square, Flat, Bright, Black |
| Finish | Hot Rolled, Cold Drawn, Centreless Ground, Polished, Peeled |
| Condition | Solution Annealed |
Chemical Composition of Super Duplex S32750 Round Bar
| Element | Carbon (C) | Manganese (Mn) | Silicon (Si) | Phosphorus (P) | Sulphur (S) | Chromium (Cr) | Nickel (Ni) | Molybdenum (Mo) | Nitrogen (N) | Copper (Cu) | Iron (Fe) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Percentage (%) | 0.030 max | 1.20 max | 0.80 max | 0.035 max | 0.020 max | 24.0–26.0 | 6.0–8.0 | 3.0–5.0 | 0.24–0.32 | 0.50 max | Balance |
PREN = %Cr + 3.3 × %Mo + 16 × %N ≈ 42 (minimum). This exceeds the >40 threshold required for super duplex classification.
Mechanical Properties of ASTM A479 S32750 Round Bar and Rod
| Property | Tensile Strength (min) | Yield Strength 0.2% (min) | Elongation (min) | Hardness (max) |
|---|---|---|---|---|
| Value | 795 | 550 | 15 | 310 |
| Unit | MPa (115 ksi) | MPa (80 ksi) | % | HBW (32 HRC) |
Grade F53 Super Duplex Round Bar Equivalent Grades
| Standard / System | UNS | Werkstoff Nr. | EN | AFNOR | ASTM (Forging) |
|---|---|---|---|---|---|
| Designation | S32750 | 1.4410 | X2CrNiMoN 25-7-4 | Z3CND 25-06Az | A182 F53 |
Physical Properties of Super Duplex Stainless Steel UNS S32750
| Property | Density | Melting Range | Thermal Conductivity (20°C) | Specific Heat Capacity | Electrical Resistivity | Thermal Expansion (20–100°C) | Elastic Modulus |
|---|---|---|---|---|---|---|---|
| Value | 7.8 | 1350–1400 | 14.2 | 480 | 0.85 | 13.0 × 10⁻⁶ | 200 |
| Unit | g/cm³ | °C | W/m·K | J/kg·K | µΩ·m | /°C | GPa |
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Available Forms of Super Duplex UNS S32750 Bar and Rod
Super Duplex S32750 Round Bar
S32750 Bright Bar
UNS S32750 Hex Bar
Super Duplex F53 Flat Bar
Alloy 2507 Square Bar
Super Duplex S32750 Black Bar
Hot Working, Cold Forming, and Heat Treatment of S32750 Bar
Hot work S32750 bar at 1100–1230°C. Do not work below 1000°C. Reheat between passes if the temperature drops below this threshold. Solution anneal at 1050–1120°C followed by rapid water quench to restore phase balance and corrosion resistance.
Cold forming is possible but requires higher forces than austenitic grades. Stress relieve at the solution annealing temperature after heavy cold work. For welding, use matching filler ER2594 (AWS A5.9). Control heat input between 0.5–2.5 kJ/mm with interpass temperature below 150°C. No PWHT is required for most applications. Avoid extended exposure above 300°C due to 475°C embrittlement risk.
Industries and Applications Using Super Duplex S32750 (F53) Round Bar and Rod
- Subsea bolting, Christmas tree components, valve stems, pump shafts, and wellhead connectors. S32750 bar is NACE MR0175 compliant for sour service and is machined into critical fasteners for topside and subsea equipment.
- Agitator shafts, mixer shafts, reactor internals, heat exchanger tie rods, and pressure vessel studs in chloride-bearing organic and inorganic acids.
- Pump shafts in reverse osmosis systems, high-pressure fasteners for membrane housings, and valve components in brine handling circuits.
- Propeller shafts, rudder stocks, seawater pump components, and mooring hardware. S32750 bar resists seawater-induced pitting at temperatures exceeding 50°C CPT.
- Flue gas desulphurisation scrubber internals, absorber tower fasteners, and fan shaft components exposed to acidic condensates.
- Bleach plant equipment shafts, digester bolting, and process vessel studs in chlorine dioxide environments.
How to Order Super Duplex UNS S32750 (F53) Round Bar and Rod from Nicorex Alloys
- Bar Form - Round bar, hex bar, flat bar, square bar, bright bar, rod
- Grade and UNS - S32750, F53, SAF 2507
- Applicable Standard - ASTM A276, A479, or EN 10088-3
- Diameter and length - In mm or inches
- Surface Finish - Hot rolled, cold drawn, bright, peeled, polished
- Condition - Solution Annealed / Solution Treated & Precipitation Hardened
- Quantity - number of pieces, kg, or MT
- Test Certificates Required - EN 10204 3.1, NACE compliance, PMI report
- Additional testing - impact test, IGC per ASTM A262, ferrite count
- Delivery Destination - Domestic India / international export
Frequently Asked Questions
What is the Price of Super Duplex S32750 (F53) Round Bar per kg in India?
Super duplex S32750 round bar prices in India typically range from ₹800 to ₹1,500 per kg. The price depends on the diameter, quantity, finish, and current nickel/chromium surcharges. Smaller diameters and bright-finished bars cost more.
What ASTM Standard covers S32750 Round Bar?
ASTM A276/A276M (general-purpose bars) and ASTM A479/A479M (bars for boilers and pressure vessels) both cover UNS S32750. The ASME equivalents are SA276 and SA479. Forged products fall under ASTM A182 Grade F53.
What is the Maximum Service Temperature for S32750 Round Bar?
S32750 bar is suitable for continuous service up to 300°C (572°F). Extended exposure above this temperature risks 475°C embrittlement and sigma phase precipitation. This degrades toughness and corrosion resistance.
What is the Difference between S32750 and S32760 Round Bar?
Does S32750 Bar Require Post-Weld Heat Treatment?
No. PWHT is generally not required when the correct procedures are followed. Use matching filler ER2594, control heat input between 0.5–2.5 kJ/mm, and maintain interpass temperature below 150°C. Ferrite content of 35–65% in the weld zone confirms acceptable phase balance.