UNS NO32760 (F55) Angles and Channels
In the solution-annealed condition F55 structural sections typically show yield strength ≈ 500–600 MPa, tensile strength ≈ 750–950 MPa (size and fabrication dependent), elongation generally ≥15–25% and hardness in the duplex range (approx. HB 270–310). Equivalent/linked designations you may see in project specs include UNS S32760, EN 1.4501 family descriptors or trade names referencing “Super-Duplex F55”; engineering teams commonly specify these equivalents to assure interchangeability and compliance with international codes..
The alloying for F55 angles & channels is focused on high resistance to localized corrosion: Cr ~24–26%, Ni ~6–8%, Mo ~3–4%, N ~0.20–0.30%, with carbon kept very low (≤0.03%). Small controlled additions (Cu/W where specified) and limits on Mn/Si/P/S preserve toughness and weldability. This chemistry yields a high Pitting Resistance Equivalent Number (PREN ≥ ~40), which is why F55 is preferred for seawater, brackish and chloride-bearing chemical services.
UNS S32760 (commonly called F55) angles and channels are super-duplex stainless steel structural sections that combine very high mechanical strength with outstanding resistance to pitting, crevice corrosion and chloride stress-corrosion cracking. Rose Metal Industries manufactures, stocks and exports F55 angles and channels for heavy-duty and corrosive environments — supplying projects across Tamil Nadu, Andhra Pradesh, Karnataka, Telangana, Puducherry (Pondicherry) and the Andaman & Nicobar Islands as well as international markets. These profiles are used where designers require lighter, stronger structures than those possible with conventional austenitic steels (304/316) while gaining superior lifetime performance in marine and chemical service..
Rose Metal Industries supplies UNS S32760 angles & channels to common international specifications and customer requirements (typical references: ASTM A276/A479 for bars and profiles, EN 1.4501 equivalents, ASME/UNS designations and project-specific drawings). Forms supplied include hot-rolled and forged angles and channels, cut-to-length pieces, pickled or polished finishes, and deliveries with Mill Test Certificates (MTC), PMI and optional third-party inspection for export projects..
Specifications & Standards
| Property | Typical / Standard |
|---|---|
| Grade | UNS S32760 (F55) — Super Duplex Stainless Steel |
| Standards | ASTM A276 / A479, EN equivalents (EN 1.4501 family), ASME/UNS project specs |
| Forms | Angles, Channels, cut-to-length, hot-rolled, pickled / polished |
| Finishes | Hot-rolled, pickled, polished, custom machining |
| Testing | Dimensional, tensile, hardness, PMI, MTC (EN 10204 3.1 / 3.2 on request) |
Chemical Composition (typical ranges, wt %)
| Element | F55 (typical) |
|---|---|
| Chromium (Cr) | 24.0 – 26.0 |
| Nickel (Ni) | 6.0 – 8.0 |
| Molybdenum (Mo) | 3.0 – 4.0 |
| Nitrogen (N) | 0.20 – 0.30 |
| Carbon (C) | ≤ 0.03 |
| Copper (Cu) | ≈ 0.2 – 1.0 (where specified) |
| Tungsten (W) | ≈ 0.0 – 1.0 (where specified) |
| Iron (Fe) | Balance |
Mechanical Properties (typical — solution annealed)
| Property | Typical Value | Notes |
|---|---|---|
| Yield Strength (0.2% proof) | ≈ 500 – 600 MPa | Depends on section & processing |
| Tensile Strength (UTS) | ≈ 750 – 950 MPa | Section & heat treatment dependent |
| Elongation | ≥ 15 – 25% | Good ductility |
| Hardness | ≈ HB 270 – 310 | Typical duplex hardness range |
Equivalent Grades & Designations
| System | Designation / Equivalent |
|---|---|
| UNS | S32760 |
| EN / DIN | EN 1.4501 family (X2CrNiMoCuWN25-7-4 variants depending on spec) |
| ASTM / ASME | F55 (trade designation), used under ASTM A276/A479 references |
| Trade | Super-Duplex F55 / 32760 |
Dimension Chart — Typical Commercial Sizes
Commercial ranges vary by mill and stock. Rose Metal Industries offers custom sizes and cut-to-length supply.
| Profile | Size Range (mm) | Thickness (mm) | Length (mm) |
|---|---|---|---|
| Angles | 20 × 20 up to 200 × 200 | 3 – 25 | 2000 – 6000 (cut to length available) |
| Channels | 50 × 25 up to 300 × 100 | 4 – 30 | 2000 – 6000 (custom lengths available) |
Typical Applications
- Offshore platform structural frameworks, topside and subsea supports
- Desalination plant structures, seawater intakes and brine handling supports
- Chemical & petrochemical plant support frames and corrosive service structures
- Power plant structural supports and cooling system frameworks
- Coastal civil works, bridges and infrastructure exposed to saline atmospheres
- Heavy machinery frames and high-strength corrosion-resistant structural applications
Standard commercial coverage for angles and channels varies by mill and stockist: typical angles run from 20×20 mm up to ~200×200 mm with thicknesses from 3–25 mm, and channels often span 50×25 mm up to ~300×100 mm with comparable thickness ranges; standard lengths are 2000–6000 mm or cut-to-length per order. Rose Metal Industries offers customized sizes, tolerances and special machining/finishes for structural packs and export orders, with full MTC traceability..
F55 angles and channels are specified for offshore platforms, topside and subsea structures, desalination and seawater systems, chemical/petrochemical plant structural frames, power-plant supports, and coastal civil/industrial works where chloride exposure and mechanical loads coincide. Rose Metal Industries supports project supply from single replacement pieces to bulk structural packages, providing MTCs, PMI, NDT/inspection and export documentation — servicing domestic projects in Tamil Nadu, Andhra Pradesh, Karnataka, Telangana, Puducherry and the Andaman & Nicobar Islands and exports to the Middle East, Southeast Asia, Europe and beyond. For SEO and cataloging include keywords such as “UNS S32760 angles, F55 channels, super duplex structural sections, Rose Metal Industries, Tamil Nadu stainless supplier, export super duplex” in product pages and meta descriptions..
Frequently Asked Questions (FAQ)
Q1: How does F55 (S32760) differ from F53 (S32750)?
A: F55 (S32760) typically contains higher Cr, Mo and N than F53 (S32750), resulting in increased pitting/crevice resistance (higher PREN) and greater mechanical strength — making F55 the preferred choice for very aggressive chloride environments and higher load structural uses.
Q2: Do you supply Mill Test Certificates (MTC) and third-party inspection?
A: Yes — Rose Metal Industries issues full MTCs (EN 10204 3.1/3.2 on request), performs PMI and can arrange third-party inspection and NDT as required for export and project compliance.
Q3: Can you provide custom sizes and machining for angles and channels?
A: Yes — we offer cut-to-length, bespoke machining, drilled/slot profiles, special surface finishes and packing to suit domestic (Tamil Nadu, Andhra Pradesh, Karnataka, Telangana, Puducherry, Andaman & Nicobar Islands) and international project requirements.
Q4: Which industries most commonly use F55 angles & channels?
A: Main users include offshore oil & gas, desalination, chemical & petrochemical plants, marine construction, power generation and heavy industrial fabrication where chloride exposure and structural loads coincide.
Q5: Do you export F55 structural packs?
A: Yes — Rose Metal Industries exports F55 angles & channels with complete documentation, export packaging and logistics support to markets in the Middle East, Southeast Asia, Europe and other global destinations.