UNS NO32750 (F53) Hexagon Rods
UNS S32750 (F53) hexagon rods are a premium super-duplex stainless steel product combining very high mechanical strength with outstanding resistance to localized corrosion (pitting, crevice) and stress-corrosion cracking in chloride-bearing environments. Rose Metal Industries manufactures, stocks and exports S32750 hex rods in multiple finishes (black, bright, peeled, polished and ground) to meet industrial and offshore requirements. This alloy’s balanced ferrite–austenite microstructure gives it performance advantages over common austenitic grades, making it a preferred choice for severe service applications. .
Chemically, S32750 (F53) is characterized by high chromium (≈24–26%), molybdenum (≈3–5%), nickel (≈6–8%) and deliberately elevated nitrogen (≈0.24–0.32%) levels—elements that raise the Pitting Resistance Equivalent (PREn) well above 40 and deliver excellent seawater and chloride resistance. Rose Metal Industries ensures each lot is PMI-verified when requested and supplied with full mill test certificates (MTC) to demonstrate composition and traceability for domestic and export customers
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Mechanically, S32750 hexagon rods offer substantially higher strength than typical 300-series stainless steels: minimum 0.2% proof (yield) values commonly sit around 515–550 MPa with tensile strengths typically in the 730–800 MPa range and elongation ≈15% (depending on product form and heat treatment). These properties make hexagon bars excellent for load-bearing fasteners, shafts, flanges and high-stress machined components where both strength and corrosion resistance are required. Rose Metal Industries supplies mechanical test reports with each shipment.
Availability and dimensional options for hexagon rods are broad: S32750 is produced and stocked in hex (A/F), round, square and flat forms with sizes commonly ranging from small machining bars up to large bars suitable for forging or heavy machining. Typical stock lengths run from 1000 mm up to 6000 mm (cut-to-length available), and finishes include hot-rolled, cold-drawn bright and polished to facilitate precision machining. Rose Metal Industries maintains inventory and fast dispatch services to industrial centres across Tamil Nadu, Andhra Pradesh, Karnataka, Telangana, Puducherry (Pondicherry) and the Andaman & Nicobar Islands, and handles export packaging and documentation for global shipments.
Specifications & Standards
| Property | Typical / Standard |
|---|---|
| Grade | UNS S32750 (F53) Super Duplex Stainless Steel |
| Standards | ASTM A276 / A479 / A182, EN 10088 / EN 1.4410, ASME SA-479 |
| Forms | Hexagon rods / bars |
| Finishes | Hot-rolled / Bright / Peeled / Polished / Turned / Ground |
| Testing & Certification | PMI, Chemical Analysis, Tensile & Hardness tests, MTC (EN 10204), Traceability |
Chemical Composition (typical ranges, wt %)
| Element | S32750 (F53) |
|---|---|
| Chromium (Cr) | 24.0 – 26.0 |
| Nickel (Ni) | 6.0 – 8.0 |
| Molybdenum (Mo) | 3.0 – 5.0 |
| Nitrogen (N) | 0.24 – 0.32 |
| Manganese (Mn) | ≤ 1.2 |
| Carbon (C) | ≤ 0.03 |
| Silicon (Si) | ≤ 0.8 |
| Balance | Iron (Fe) + residuals |
Mechanical Properties (typical)
| Property | Typical Value |
|---|---|
| Tensile Strength (UTS) | ≥ 780 – 820 MPa |
| Yield Strength (0.2% proof) | ≥ 510 – 560 MPa |
| Elongation (in 50 mm) | ≥ 15% |
| Hardness | ≈ 280 – 320 HB (varies with finish/form) |
Actual values depend on heat treatment, product form and finish. Rose Metal Industries provides test certificates with each batch.
Equivalent Grades & Designations
| Standard | Designation / Equivalent |
|---|---|
| UNS | S32750 |
| EN / DIN | 1.4410 / X2CrNiMoN25-7-4 |
| ASTM / ASME | F53 / A182 F53 / A479 S32750 |
| Common Trade Name | Super Duplex F53 / Super Duplex S32750 |
Dimension Chart — Hexagon Rods (Typical Stock Sizes)
| Across Flats (mm) | Approx. Weight (kg/m) | Typical Lengths (mm) |
|---|---|---|
| 10 mm | 0.78 | 1000 / 3000 |
| 16 mm | 2.00 | 1000 / 3000 |
| 20 mm | 3.12 | 1000 / 3000 |
| 25 mm | 4.85 | 1000 / 3000 |
| 32 mm | 8.00 | 2000 / 3000 |
| 40 mm | 12.50 | 2000 / 3000 |
| 50 mm | 19.60 | 2000 / 3000 |
| 60 mm | 28.27 | 2000 / 3000 |
Custom sizes, custom lengths, and special tolerances available on request — contact Rose Metal Industries for availability.
Applications
- Offshore & topside oil & gas components — fasteners, connectors, flanges.
- Seawater and desalination plant equipment, pipes, pumps, valves — especially in coastal states like Tamil Nadu, Andhra Pradesh, Karnataka, Kerala, Puducherry, Andaman & Nicobar Islands.
- Chemical & petrochemical plant hardware exposed to chloride / acid / brine environments.
- Marine engineering, shipbuilding, coastal structural components and marine hardware.
- High-pressure pumps, shafts, couplings, mechanical components in desalination, power and process plants.
- Heat exchangers, pressure vessels and process-plant structural parts requiring high corrosion resistance and strength.
Typical applications for UNS S32750 (F53) hexagon rods include offshore and topside oil & gas components (fasteners, connector bodies, valve parts), pump shafts and couplings, desalination and seawater systems, chemical process equipment, heat exchanger manifolds and marine hardware. In coastal Indian markets (Chennai, Visakhapatnam, Mangalore, Port Blair, etc.) and international projects (Middle East, SE Asia, Europe), the alloy’s combination of high strength and localized corrosion resistance reduces maintenance cycles and lifetime cost of ownership..
For procurement, Rose Metal Industries supplies UNS S32750 (F53) hexagon rods to ASTM/ASME and EN standards (examples: ASTM A182/A479, EN 1.4410) and can provide EN 10204/3.1 MTCs, NACE/ISO15156 compliance on request, and third-party inspection. Whether you need standard hexagon sizes for fasteners or large hex bars for bespoke machining, Rose Metal Industries supports technical selection, value engineering and timely export from India to global markets. Contact their sales team with required size, finish and quantity for an expedited quotation..
Frequently Asked Questions (FAQ)
Q1: What is UNS S32750 (F53) Duplex Stainless Steel?
A: UNS S32750, also known as F53 or Super Duplex 2507, is a super duplex stainless steel grade containing high chromium, molybdenum, and nitrogen. It offers exceptional corrosion resistance, especially in chloride-rich and marine environments.
Q2: Do you provide mill test certificates for F53 Hexagon Rods?
A: Yes — Rose Metal Industries supplies F53 hexagon rods with complete Mill Test Certificates (EN 10204 3.1). We also provide third-party inspection, PMI testing, and chemical/ mechanical reports upon request.
Q3: What standards do your S32750 (F53) Hex Bars comply with?
A: Our hexagon rods comply with ASTM A276, ASTM A479, ASTM A582, ASME SA479, and equivalent EN / ISO standards depending on customer requirements and export destination.
Q4: Can you supply custom sizes, machining, and cut-to-length services?
A: Yes — we offer customized lengths, precise machining, CNC cutting, export-ready packaging, and special tolerances for industries across Tamil Nadu, Karnataka, Telangana, Andhra Pradesh, Puducherry, and the Andaman & Nicobar Islands.
Q5: Where are F53 Hexagon Rods commonly used?
A: F53 hex bars are widely used in offshore platforms, desalination units, pump shafts, marine components, heat exchangers, chemical processing, high-pressure systems, and industries requiring superior strength and corrosion resistance.