UNS NO32760 (F55) Flat Bars
UNS S32760 (commonly called Super-Duplex F55) flat bars are high-performance stainless steel products engineered to deliver a rare combination of very high mechanical strength and exceptional resistance to localized corrosion (pitting, crevice corrosion and chloride stress-corrosion cracking). Rose Metal Industries manufactures, stocks and exports F55 flat bars for demanding sectors — serving projects and customers across Tamil Nadu, Andhra Pradesh, Karnataka, Telangana, Puducherry (Pondicherry) and the Andaman & Nicobar Islands, as well as international markets in the Middle East, Southeast Asia, Europe and beyond. These flat bars are chosen where designers need long life in aggressive, chloride-bearing environments while keeping section sizes and weight to a minimum.
F55 flat bars are widely used in offshore and marine structures, chemical and petrochemical plants, desalination and seawater systems, power plant equipment, heat exchanger supports and heavy industrial fabrications. Their superior PREN (pitting resistance equivalent number) and duplex microstructure make them ideal for seawater cooling lines, brine handling frames, structural supports in topside and subsea installations, pump bases, machine frames and any application where exposure to chlorides or acidic service would prematurely degrade conventional 304/316 grades.
Rose Metal Industries supplies UNS S32760 flat bars to internationally recognized standards and customer specifications (common references include ASTM and EN family standards). Product forms include hot-rolled and cold-finished flat bars, cut-to-length lengths, and special machining or surface finishes (pickled, polished, bright). Typical project documentation is provided (Mill Test Certificate / MTC), and third-party inspection, PMI and NDT can be arranged for export or critical projects to ensure traceability and compliance with client QA/QC requirements..
The alloy chemistry that gives F55 its performance generally centers on ~24–26% Chromium (Cr), ~6–8% Nickel (Ni), ~3–4% Molybdenum (Mo) and Nitrogen ≈ 0.20–0.30%, with carbon kept ≤ 0.03% and controlled levels of Mn, Si, P and S. Minor constituents such as copper or tungsten may appear in some specifications to further improve localized corrosion resistance. This blend results in PREN values typically ≥ 40, delivering markedly better resistance to pitting and crevice corrosion than standard duplex or austenitic stainless steels.
In the solution-annealed condition F55 flat bars typically show yield strength in the order of ~500–600 MPa and ultimate tensile strength commonly ~750–950 MPa, with good ductility (elongation often ≥15–25%) and duplex-range hardness (~HB 270–310 depending on section and treatment). Common equivalent / cross-reference designations you will see in engineering specifications include UNS S32760 and EN 1.4501 family descriptors — project teams often specify these equivalents to ensure material interchangeability on global contracts..
Rose Metal Industries stocks a practical range of flat bar widths and thicknesses and can supply custom dimensions, cut-to-length services and special machining for structural packs and fabrication. Typical commercial dimension coverage ranges from narrow strip/flat gauges up to heavy structural flat bars (widths e.g. 20–200 mm and thicknesses e.g. 4–50 mm — exact availability depends on mill/stock). The company supports domestic deliveries across Tamil Nadu, Andhra Pradesh, Karnataka, Telangana, Puducherry and the Andaman & Nicobar Islands and coordinates export logistics, packaging, MTCs and inspection for international projects — positioning F55 flat bars as a reliable, long-life choice for corrosive, high-stress applications worldwide..
Frequently Asked Questions (FAQ)
Q1: What advantages does F55 offer over standard 304 / 316 flat bars?
A: F55 flat bars deliver significantly higher strength and much better resistance to pitting, crevice corrosion and chloride stress-corrosion cracking — critical for seawater, chemical, offshore or chloride-containing environments.
Q2: Do you supply Mill Test Certificates (MTC) and test reports?
A: Yes — Rose Metal Industries provides full MTCs, chemical analysis reports (PMI), mechanical test results, and optional third-party inspection for export projects.
Q3: Can you supply custom sizes, cut-to-length, and special surface finish?
A: Yes — we offer cut-to-length flat bars, custom width/ thickness combinations, pickled or polished finishes, and special machining per project requirements.
Q4: Which industries use F55 flat bars most commonly?
A: Offshore & marine, desalination, chemical & petrochemical, power generation, seawater-exposed structural work, and heavy industrial fabrication requiring high corrosion resistance and structural strength.
Q5: Do you supply to export markets as well as Indian states?
A: Yes — apart from domestic supply in Tamil Nadu, Andhra Pradesh, Karnataka, Telangana, Puducherry, Andaman & Nicobar Islands, we export F55 flat bars globally with full export documentation, packaging and logistics support.