UNS NO32750 (F53) Pipe Fittings
UNS S32750, commonly known as Super Duplex F53, is a high-performance stainless steel alloy designed for use in challenging environments requiring superior corrosion resistance and mechanical strength. Rose Metal Industries manufactures, stocks, and exports F53 pipe fittings, offering seamless and welded options for diverse industrial applications. These fittings are particularly suitable for Tamil Nadu, Andhra Pradesh, Karnataka, Telangana, Puducherry, and the Andaman & Nicobar Islands, where coastal and industrial conditions demand materials that can resist chlorides, seawater, and chemical attack..
F53 pipe fittings are widely used in oil and gas pipelines, chemical processing, petrochemical plants, seawater desalination, offshore and marine projects, and high-pressure piping systems. Their exceptional resistance to pitting, crevice corrosion, and stress corrosion cracking makes them ideal for critical applications such as bends, elbows, tees, reducers, and flanges, ensuring safe and reliable flow management in aggressive environments.
 Pipe Fittings.webp)
Rose Metal Industries supplies UNS S32750 pipe fittings according to international standards such as ASTM A182, ASTM A403, and ASME B16.9/B16.11. The fittings are available in various sizes, schedules, and wall thicknesses, and are manufactured to meet customer-specific requirements. Available finishes include pickled, polished, and bright annealed, ensuring both performance and aesthetic quality for industrial and marine installations.
The chemical composition of Super Duplex F53 fittings is engineered for maximum corrosion resistance and mechanical strength. Typically, these fittings contain 24–26% Chromium, 6–8% Nickel, 3–5% Molybdenum, and 0.24–0.32% Nitrogen. Low carbon content (≤0.03%) prevents sensitization during welding, while other elements such as Manganese, Silicon, Phosphorus, and Sulfur are controlled to maintain structural integrity and reliability in aggressive chemical or seawater environments..
Specifications & Standards
| Property | Typical / Standard |
|---|---|
| Grades | SS 304 (AISI 304 / EN 1.4301 / UNS S30400), SS 304L (AISI 304L / EN 1.4307 / UNS S30403) |
| Standards | ASTM A276, ASTM A479, EN 10088, ASME/UNS |
| Forms | Hot-rolled bar, cold-drawn bright bar, turned & polished bar |
| Surface Finish | Hot-rolled, bright, polished |
| Testing | Dimensional, tensile, hardness, PMI, MTC |
Chemical Composition (typical ranges)
| Element | SS 304 (wt %) | SS 304L (wt %) |
|---|---|---|
| Carbon (C) | ≤ 0.08 | ≤ 0.03 |
| Manganese (Mn) | ≤ 2.00 | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.045 | ≤ 0.045 |
| Sulfur (S) | ≤ 0.03 | ≤ 0.03 |
| Chromium (Cr) | 18.0 – 20.0 | 18.0 – 20.0 |
| Nickel (Ni) | 8.0 – 10.5 | 8.0 – 12.0 |
| Nitrogen (N) | ≤ 0.10 | ≤ 0.11 |
Mechanical Properties (typical)
| Property | Typical Value | Notes |
|---|---|---|
| Tensile Strength (UTS) | 485 – 620 MPa | Depends on product form |
| Yield Strength | 205 – 310 MPa | Cold drawn higher |
| Elongation | 40% min | High ductility |
| Hardness | HRB 80–95 | Varies with condition |
Equivalent Grades & Designations
| Common Name | ASTM / AISI | EN | UNS |
|---|---|---|---|
| Stainless Steel 304 | AISI 304 / ASTM A276 | 1.4301 | UNS S30400 |
| Stainless Steel 304L | AISI 304L / ASTM A276 | 1.4307 | UNS S30403 |
Dimension Chart — Round Bar (Common sizes)
Standard diameters supplied in mm & inch.
| Diameter (mm) | Diameter (inch) | Lengths (mm) | Tolerance |
|---|---|---|---|
| 6–16 | 1/4"–1/2" | 1000–3000 | ASTM/EN |
| 18–30 | 3/4"–1" | 1000–3000 | ±0.1–0.5 mm |
| 32–45 | 1.25"–1.5" | 1000–3000 | ±0.2–0.6 mm |
| 50–75 | 2"–2.5" | 2000–3000 | Custom |
| 80–200 | 3"+ | Mill / cut | Custom |
Typical Applications
- Food processing & dairy equipment
- Architectural railings & structures
- Piping components & fittings
- Automotive components
- Heat exchangers & vessels
- General machining & fabrication
F53 pipe fittings provide excellent mechanical performance, with yield strength around 550 MPa, tensile strength of 795–800 MPa, and elongation of at least 15% depending on wall thickness and processing. The hardness typically reaches up to 310 HB. These properties ensure that fittings can withstand high pressures, thermal stresses, and mechanical loads, making them suitable for critical applications in chemical plants, offshore rigs, and coastal pipelines..
Rose Metal Industries caters to both domestic and international clients, supplying UNS S32750 pipe fittings to industries across Southern India — including Tamil Nadu, Andhra Pradesh, Karnataka, Telangana, Puducherry, and the Andaman & Nicobar Islands — as well as to global markets in the Middle East, Southeast Asia, and Europe. Custom solutions, third-party inspection, MTC certification, and export-ready packaging ensure that customers receive high-quality fittings ready for industrial, marine, and offshore deployment..
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.