UNS NO32760 (F55) Square Rods
UNS S32760 (F55) Square Rods are high‑performance super‑duplex stainless steel products, engineered to provide a balanced combination of superior corrosion resistance, high strength, and toughness. The F55 grade is particularly suited for aggressive environments — including seawater, chloride‑bearing media, chemical process fluids, and offshore/marine conditions — thanks to its enhanced alloying and duplex microstructure. As a manufacturer, stockist, and exporter, Rose Metal Industries supplies F55 square rods to industries across India and international markets, serving clients in Tamil Nadu, Andhra Pradesh, Karnataka, Telangana, Puducherry (Pondicherry), and Andaman & Nicobar Islands..
Super‑duplex F55 offers significantly higher resistance to pitting, crevice corrosion, and stress‑corrosion cracking compared with standard austenitic or duplex stainless steels, making it ideal for critical structural and mechanical components. The balanced ferrite–austenite microstructure, along with carefully controlled composition, gives F55 square rods the robustness required for high‑demand industrial, marine, offshore, and chemical applications..
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Rose Metal Industries is a recognized manufacturer, stockist, and exporter of UNS S32760 (F55) square rods, catering not only to major Indian states like Tamil Nadu, Andhra Pradesh, Karnataka, Telangana, Puducherry (Pondicherry), and Andaman & Nicobar Islands, but also exporting globally to Europe, the Middle East, Southeast Asia, and North America. The company maintains a consistent inventory of standard and custom sizes, enabling fast delivery for industrial, marine, chemical, and offshore projects. Strict quality control and international certification ensure that products meet ASTM, ASME, EN, and UNS standards required by global clients..
Despite its high strength, UNS S32760 (F55) exhibits excellent machinability and weldability when proper procedures are followed. Preheating is generally not required, and post-weld solution annealing preserves corrosion resistance. This makes F55 square rods highly versatile for fabrication into custom structures, machinery frames, brackets, and other industrial components. The material can also be surface-treated, polished, or pickled for aesthetic or functional requirements, providing flexibility for both industrial and architectural applications.
Specifications & Standards
| Property | Typical / Standard |
|---|---|
| Grades | UNS S32750 (F53) Angles & Channels, Super Duplex Stainless Steel |
| Standards | ASTM A276, ASTM A479, EN 10088, ASME/UNS |
| Forms | Angles, Channels, Custom sizes |
| Surface Finish | Hot-rolled, Pickled, Polished |
| Testing | Dimensional, Tensile, Hardness, PMI, MTC |
Chemical Composition (typical ranges)
| Element | F53 (wt %) |
|---|---|
| Carbon (C) | ≤ 0.03 |
| Chromium (Cr) | 24–26 |
| Nickel (Ni) | 6–8 |
| Molybdenum (Mo) | 3–4 |
| Nitrogen (N) | 0.20–0.30 |
| Copper (Cu) | 0.5–1 |
| Tungsten (W) | 0.5–1 |
Mechanical Properties (typical)
| Property | Typical Value | Notes |
|---|---|---|
| Yield Strength | ≈ 520–550 MPa | Annealed condition |
| Tensile Strength (UTS) | ≈ 750–950 MPa | Depends on size & form |
| Elongation | > 15% | Good ductility |
| Hardness | 290–310 HB | Varies with condition |
Equivalent Grades & Designations
| Common Name | ASTM / AISI | EN | UNS |
|---|---|---|---|
| Super Duplex Stainless Steel | ASTM A276 / A479 | 1.4501 | UNS S32750 |
Dimension Chart — Angles & Channels (Common sizes)
Standard sizes supplied in mm & custom lengths.
| Size (mm) | Thickness (mm) | Length (mm) | Tolerance |
|---|---|---|---|
| 20×20 – 150×150 | 3–20 | 2000–6000 | ±0.1–0.5 mm |
| 50×25 – 200×75 | 5–25 | 2000–6000 | Custom |
Typical Applications
- Offshore and marine structural frameworks
- Chemical and petrochemical plant supports
- Desalination and water treatment structures
- Power generation equipment supports
- Heavy machinery frameworks
- Corrosion-resistant structural components
F55 square rods provide superior pitting and crevice corrosion resistance compared with standard duplex or austenitic stainless steels, thanks to higher Cr, Mo, and N content. The alloy performs exceptionally well in chloride-rich environments, such as seawater exposure in marine construction or offshore oil and gas installations. It is also resistant to stress corrosion cracking, which is a critical property for components subjected to tensile stresses in chemically aggressive environments..
UNS S32760 (F55) square rods are extensively used in chemical processing plants, desalination plants, offshore platforms, power generation units, and marine structures. The combination of high mechanical strength and corrosion resistance reduces maintenance costs and extends service life. In addition, the material’s duplex microstructure offers excellent fatigue resistance, making it suitable for cyclic loading applications in machinery, offshore structures, and structural frameworks..
Frequently Asked Questions (FAQ)
Q1: What is the difference between 304 and 304L?
A: 304L has a lower maximum carbon content (≤0.03%) which reduces the risk of sensitization during welding, making it preferable for heavy gauge welded components. Mechanical properties are similar; choose 304L when welding without post-weld anneal is required.
Q2: Do you provide mill test certificates (MTC)?
A: Yes — Rose Metal Industries issues MTCs and can facilitate third-party inspection and PMI/chemical analysis on request.
Q3: What standards do your round bars comply with?
A: We supply material to customer-specified standards including ASTM A276 / A479 and EN standards (e.g., EN 10088 series) depending on product form and destination requirements.
Q4: Can you supply custom diameters, lengths and surface finishes?
A: Yes — we offer cut-to-length, turned/bright finish, polishing and custom tolerances. Contact sales for lead times and minimum order quantities.
Q5: How should I select 304 vs 316 for corrosion resistance?
A: 304 is suitable for many indoor and mildly corrosive environments. For chloride-rich environments (marine, salt-spray, swimming pools) or higher corrosion resistance needs, consider 316 (higher Mo content). Our sales team will advise based on application.