UNS NO32750 (F53) Round Rods
UNS S32750 (F53) Super Duplex Round Rods are one of the most reliable and high-performance stainless steel materials used across highly corrosive and high-pressure environments. Rose Metal Industries is a leading manufacturer, stockist, and global exporter of F53 Round Rods, supplying consistent quality products to major industries across Tamil Nadu, Andhra Pradesh, Karnataka, Telangana, Puducherry (Pondicherry), and the Andaman & Nicobar Islands, as well as worldwide. Known for exceptional strength and superior resistance to pitting and crevice corrosion, these rods are widely chosen for offshore, marine, chemical, and desalination applications..
The chemical composition of UNS S32750 F53 includes a high percentage of Chromium (24–26%), Nickel (6–8%), and Molybdenum (3–5%), enhanced with Nitrogen (0.24–0.32%), giving the alloy a very high PREn (Pitting Resistance Equivalent) value above 40. This unique combination provides outstanding resistance to stress-corrosion cracking, especially in chloride-rich environments like seawater. Rose Metal Industries ensures all material is tested and certified as per global quality standards before dispatch..
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Mechanically, Super Duplex F53 Round Rods offer exceptional strength, featuring yield strength around 500–700 MPa and tensile strength between 750–900 MPa. The dual-phase austenitic-ferritic microstructure enhances toughness while maintaining high resistance to cracking and deformation under load. These properties make F53 rods preferred for applications demanding both structural reliability and chemical resistance. Rose Metal Industries supplies these rods in hot-rolled, cold-drawn, turned, or polished finishes according to customer requirements..
Equivalent grades for UNS S32750 include DIN 1.4410, Super Duplex F53, and sometimes SAF 2507 (composition varies slightly). These grades are commonly referenced across global industries and procurement standards. Rose Metal Industries maintains a wide stock range from small machining diameters to large forging sizes, ensuring immediate availability for urgent requirements across industrial hubs like Chennai, Coimbatore, Bengaluru, Hyderabad, Visakhapatnam, Mangaluru, Puducherry, and Port Blair..
Specifications & Standards
| Property | Typical / Standard |
|---|---|
| Grade | Super Duplex UNS S32750 / F53 / EN 1.4410 |
| Standards | ASTM A276, ASTM A479, ASTM A182, EN 10088-3 |
| Forms | Hot-rolled bars, forged bars, cold-drawn bright bars |
| Surface Finish | Black, bright, peeled, polished, ground |
| Testing | PMI, IGC, Hardness, Tensile, Hydro, MTC EN 10204/3.1 |
Chemical Composition (typical ranges)
| Element | F53 / S32750 (wt %) |
|---|---|
| Carbon (C) | ≤ 0.03 |
| Manganese (Mn) | ≤ 1.20 |
| Silicon (Si) | ≤ 0.80 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.02 |
| Chromium (Cr) | 24.0 – 26.0 |
| Nickel (Ni) | 6.0 – 8.0 |
| Molybdenum (Mo) | 3.0 – 5.0 |
| Nitrogen (N) | 0.24 – 0.32 |
Mechanical Properties (typical)
| Property | Typical Value | Notes |
|---|---|---|
| Tensile Strength (UTS) | ≥ 795 MPa | Very high strength |
| Yield Strength (0.2% Proof) | ≥ 550 MPa | Almost 2X higher than stainless steel |
| Elongation | 15 – 25% | Good ductility for duplex |
| Hardness | ≤ 32 HRC | Solution annealed |
Equivalent Grades & Designations
| Common Name | ASTM / AISI | EN | UNS |
|---|---|---|---|
| Super Duplex F53 | A182 F53 / A479 S32750 | 1.4410 | S32750 |
| Super Duplex 2507 | — | X2CrNiMoN25-7-4 | S32750 |
Dimension Chart — Round Bar (Common sizes)
Standard diameters supplied in mm & inch.
| Diameter (mm) | Diameter (inch) | Lengths (mm) | Tolerance |
|---|---|---|---|
| 6–20 | 1/4"–3/4" | 1000–6000 | ASTM / EN |
| 22–50 | 1"–2" | 1000–6000 | ±0.2–0.6 mm |
| 55–100 | 2.25"–4" | 1000–6000 | Custom |
| 110–250 | 4.5"+ | Mill / cut lengths | Custom |
Typical Applications
- Desalination plants, offshore platforms (ideal for Tamil Nadu & Puducherry coastal industries)
- Chemical & petrochemical plants in Andhra Pradesh, Karnataka & Telangana
- Pulp & paper, high-pressure equipment, pumps & shafts
- Heat exchangers, marine engineering, shipbuilding (suitable for Andaman & Nicobar Islands)
- Structural parts requiring high corrosion + high strength performance
- Oil & gas exploration, subsea components
In terms of dimensions, UNS S32750 Round Rods are available from 6 mm to over 250 mm diameter, with flexibility to supply cut-to-length sizes, custom tolerances, and machined components. This makes the material suitable for a wide variety of applications including pump shafts, valve stems, marine hardware, chemical processing equipment, heat exchanger components, and offshore structural parts. Rose Metal Industries ensures proper seaworthy export packaging and fast dispatch to both domestic and international customers..
Across India’s coastal and industrial regions—especially Tamil Nadu, Andhra Pradesh, Karnataka, Telangana, Puducherry, and the Andaman & Nicobar Islands—F53 Round Rods are widely used for projects exposed to seawater and harsh climatic conditions. With strong global supply capabilities, Rose Metal Industries continues to support oil & gas, desalination, petrochemical, power generation, and marine industries with premium-grade UNS S32750 (F53) Round Rods and technical guidance for material selection.
Frequently Asked Questions (FAQ)
Q1: What is the difference between F53 (S32750) and Duplex 2205?
A: F53 (UNS S32750) is a Super Duplex grade with higher chromium, molybdenum and nitrogen content, offering significantly superior corrosion resistance and nearly double the strength compared to Duplex 2205. It is preferred for harsh seawater, offshore and chemical processing applications.
Q2: Do you provide mill test certificates (MTC) for UNS S32750 bars?
A: Yes — Rose Metal Industries supplies MTCs as per EN 10204/3.1 and can also arrange third-party inspections, PMI testing, hardness tests and IGC tests as required by customers.
Q3: What standards do your F53 Super Duplex Round Rods comply with?
A: Our F53 round rods comply with ASTM A276, A479, A182, ASME SA182 and EN 10088-3 standards. We also supply materials as per project-specific and global offshore industry requirements.
Q4: Can you supply custom diameters, lengths and machined components?
A: Yes — we offer cut-to-length bars, precision machining, polishing, turned/ground finishes and made-to-order sizes. Custom tolerances and special surface finishes are available on request.
Q5: Where is F53 (S32750) commonly used?
A: F53 is widely used in offshore platforms, desalination plants, subsea components, heat exchangers, high-pressure vessels and marine engineering. It is ideal for coastal regions like Tamil Nadu, Karnataka, Andhra Pradesh, Puducherry and the Andaman & Nicobar Islands.