UNS NO32750 (F53) Flat Bars
UNS S32750, widely known as Super Duplex F53, is a premium stainless steel alloy that offers exceptional corrosion resistance, high tensile strength, and excellent mechanical performance. Rose Metal Industries is a leading manufacturer, stockist, and exporter of F53 flat bars, catering to industries in Tamil Nadu, Andhra Pradesh, Karnataka, Telangana, Puducherry (Pondicherry), and the Andaman & Nicobar Islands, as well as clients worldwide. These flat bars are designed to withstand aggressive chemical, marine, and offshore environments, making them suitable for critical structural and industrial applications..
F53 flat bars are extensively used in chemical processing, offshore platforms, desalination plants, marine constructions, power generation, and structural fabrication. Their duplex microstructure ensures high resistance to pitting, crevice corrosion, and stress corrosion cracking, particularly in chloride-rich and industrial environments. Typical uses include bracing, structural supports, machine bases, and fabrication of corrosion-resistant frameworks, ensuring long-term reliability in demanding applications.
 Flat Bars.webp)
Rose Metal Industries supplies UNS S32750 flat bars according to international standards such as ASTM A276 / A479 and EN 1.4410. Flat bars are available in various widths, thicknesses, and lengths to meet diverse project requirements. Surface finishes include pickled, polished, and bright annealed, providing both aesthetic appeal and enhanced corrosion resistance. Customized sizes, tolerances, and finishes are available for specialized industrial and marine applications..
The chemical composition of F53 flat bars is optimized for maximum corrosion resistance and mechanical strength. Typical composition includes 24–26% Chromium, 6–8% Nickel, 3–5% Molybdenum, and 0.24–0.32% Nitrogen, with carbon content ≤0.03% to prevent sensitization during welding. Minor elements such as Manganese, Silicon, Phosphorus, and Sulfur are tightly controlled to maintain toughness, structural integrity, and long-term durability in aggressive offshore, chemical, and coastal environments..
Specifications & Standards
| Property | Typical / Standard |
|---|---|
| Grades | UNS S32750 / ASTM A182 F53 / EN 1.4410 |
| Standards | ASTM A276, ASTM A479, EN 1.4410, ASME/UNS |
| Forms | Flat Bars, Structural Profiles |
| Surface Finish | Pickled, Polished, Bright Annealed |
| Testing | Dimensional, Tensile, Hardness, PMI, MTC |
Chemical Composition (typical ranges)
| Element | F53 / UNS S32750 (wt %) |
|---|---|
| Carbon (C) | ≤ 0.03 |
| Chromium (Cr) | 24–26 |
| Nickel (Ni) | 6–8 |
| Molybdenum (Mo) | 3–5 |
| Nitrogen (N) | 0.24–0.32 |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.02 |
Mechanical Properties (typical)
| Property | Typical Value | Notes |
|---|---|---|
| Tensile Strength (UTS) | 795–800 MPa | Depends on size and form |
| Yield Strength | 550 MPa | High load-bearing capacity |
| Elongation | ≥15% | Good ductility |
| Hardness | Up to 310 HB | Varies with treatment |
Dimension Chart — Flat Bars (Common Sizes)
| Width (mm) | Thickness (mm) | Length (mm) | Tolerance |
|---|---|---|---|
| 20–200 | 5–50 | 1000–6000 | ±0.5–1.5 mm |
Applications
- Offshore platforms and marine structures
- Chemical and petrochemical plant fabrication
- Desalination and water treatment plants
- Power plant structural supports
- Coastal construction and industrial frameworks
- High-strength, corrosion-resistant structural fabrication
F53 flat bars offer tensile strength of 795–800 MPa, yield strength around 550 MPa, elongation ≥15%, and hardness up to 310 HB, making them suitable for high-pressure and heavy-load applications. Equivalent grades include ASTM A182 F53 / UNS S32750 and EN 1.4410, ensuring compliance with international standards and suitability for critical industrial, offshore, and marine projects.
Rose Metal Industries provides UNS S32750 flat bars to both domestic and international clients. Industries in Tamil Nadu, Andhra Pradesh, Karnataka, Telangana, Puducherry (Pondicherry), and the Andaman & Nicobar Islands benefit from the company’s extensive inventory, prompt export capabilities, and quality assurance. The company also offers mill test certificates (MTC), third-party inspections, and project-specific customization, delivering ready-to-use flat bars for offshore, chemical, marine, and industrial infrastructure projects worldwide..
Frequently Asked Questions (FAQ)
Q1: What is the difference between UNS S32750 (F53) and standard stainless steel?
A: UNS S32750 (F53) is a super duplex stainless steel offering higher corrosion resistance, superior strength, and excellent resistance to pitting and stress corrosion cracking compared to standard austenitic stainless steels such as 304 or 316.
Q2: Do you provide mill test certificates (MTC)?
A: Yes — Rose Metal Industries issues MTCs for all F53 flat bars and can facilitate third-party inspection and PMI/chemical analysis on request.
Q3: What standards do your flat bars comply with?
A: Our UNS S32750 flat bars comply with ASTM A276 / A479 and EN 1.4410 standards, ensuring international quality and performance for industrial, offshore, and marine applications.
Q4: Can you supply custom widths, thicknesses, and surface finishes?
A: Yes — we offer cut-to-length flat bars, pickled, polished, bright annealed finishes, and custom tolerances. Contact our sales team for lead times and minimum order quantities.
Q5: Which industries and applications are suitable for F53 flat bars?
A: UNS S32750 flat bars are widely used in offshore platforms, chemical processing plants, desalination plants, marine structures, power generation, and industrial fabrication where high corrosion resistance and strength are required.