Stainless Steel 321 Pipe Fittings
SS 321 is a titanium-stabilized austenitic stainless steel designed to resist intergranular corrosion and carbide precipitation during welding and prolonged exposure to elevated temperatures. Rose Metal Industries manufactures SS 321 buttweld and forged fittings in a range of schedules and sizes, with finishes including pickled, polished and annealed. These fittings are extensively used where welding and post-weld heat cycles are expected — for example in refineries, heat treatment plants and chemical processing units..
Our production and quality assurance processes include full chemical verification, dimensional inspection, NDT where required, hydrostatic testing and supply of Material Test Certificates (MTC). We maintain ready stock of common fittings for rapid dispatch to customers in Chennai, Coimbatore, Bengaluru, Hyderabad, Visakhapatnam, Vijayawada, Puducherry and Port Blair, and can fulfil bulk export orders with export-grade packing and documentation..
Mechanically robust and oxidation resistant, SS 321 fittings perform well in cyclic heating, sulfidation and carburizing atmospheres. Typical applications include high-temperature piping networks, furnace connections, boiler linkages, petrochemical process lines, and marine or offshore assemblies in coastal regions such as Tamil Nadu and the Andaman & Nicobar Islands. Rose Metal Industries also offers custom machining, special end preparations and value-added services like beveling and polishing..
For export and large projects we provide full traceability, third-party inspection (SGS, BV, TUV etc.) on request, and ensure compliance with international standards. With competitive pricing, reliable lead times and technical support from our engineering team, Rose Metal Industries is a preferred partner for SS 321 pipe fittings across South India and global markets..
Specifications & Standards
| Standard | ASTM A403 / ASME SA403 (buttweld fittings), ASME B16.9 (mfg. dims), MSS SP-43 (for fittings), DIN / EN equivalents |
|---|---|
| Grades | SS 321, SS 321H (titanium-stabilized) |
| Types | Elbow (45°/90°), Tee, Reducer, Cap, Stub End, Cross, Forged Fittings |
| Finishes | Pickled & Passivated, Polished, Annealed & Pickled |
| Manufacture | Buttweld, Forged, Socket Weld, Threaded (on request) |
Chemical Composition (Typical wt%)
| Element | Typical Range (%) |
|---|---|
| Carbon (C) | ≤ 0.08 |
| Chromium (Cr) | 17.0 – 19.0 |
| Nickel (Ni) | 9.0 – 12.0 |
| Titanium (Ti) | ≥ 5 × C% |
| Manganese (Mn) | ≤ 2.0 |
| Silicon (Si) | ≤ 0.75 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Iron (Fe) | Balance |
Mechanical Properties (Typical)
| Property | Typical Value |
|---|---|
| Tensile Strength (UTS) | ≥ 515 MPa |
| Yield Strength (0.2% offset) | ≈ 205 MPa |
| Elongation | ≥ 40% (in 50 mm) |
| Hardness | Typical – suitable for forming/welding (HB/HRB varies by temper) |
Equivalent Grades & Cross-References
- UNS: S32100
- EN / WNr: 1.4541 / X6CrNiTi18-10
- JIS: SUS 321
Dimension Chart — Typical Buttweld Fittings Range
| Nominal Size (in) | Common Schedules | Available Types |
|---|---|---|
| 1/2" – 2" | Sch 5S, Sch 10S, Sch 40S | Elbow, Tee, Reducer, Cap |
| 2 1/2" – 6" | Sch 40, Sch 80 | Elbow, Tee, Reducer, Stub End |
| 8" – 24" | Sch 40, Sch 80, Sch 160 (where applicable) | Large Elbows, Tees, Reducers, Caps |
| Special | Custom thicknesses & fabricated spools | Forged fittings, flanged ends, special end prep |
Applications
- High-temperature piping in petrochemical & chemical plants
- Furnace connections, boiler linkages, and heat-treatment piping
- Refinery process lines and heat exchanger connections
- Marine and offshore piping in coastal regions (Tamil Nadu, Andaman & Nicobar)
- Power generation piping, steam lines and industrial process piping
- General fabrication where welded high-temperature joints are required
Rose Metal Industries is a leading and trusted manufacturer, stockist, and global exporter of high-performance Stainless Steel 321 Pipe Fittings, engineered for superior strength and stability in high-temperature service. Manufactured using premium titanium-stabilized austenitic stainless steel, these fittings offer outstanding resistance to intergranular corrosion and carbide precipitation—making them ideal for welded environments. With a strong presence in Tamil Nadu, Andhra Pradesh, Karnataka, Telangana, Puducherry (Pondicherry), and the Andaman & Nicobar Islands, the company is known for delivering world-class SS 321 elbows, tees, reducers, caps, stub ends, and special fabricated fittings to both domestic and international customers..
Stainless Steel 321 is specifically designed to provide excellent performance in environments where frequent heating cycles occur. Its titanium stabilization prevents chromium carbide formation, ensuring strong corrosion resistance even in continuous service up to 900°C. Rose Metal Industries utilizes advanced forging, bending, and buttweld manufacturing processes to produce fittings that meet strict dimensional accuracy and superior surface finish requirements. Our SS 321 fittings are widely chosen for critical applications in chemical processing units, petroleum refineries, boilers, and heat exchanger pipelines..
Q1: What is the difference between SS 321 and SS 321H?
A: SS 321H has higher carbon limits and is specified for higher temperature service where improved creep and rupture strength are required. Choose 321H for sustained high-temperature applications when specified.
Q2: Do you provide Mill Test Certificates (MTC) and third-party inspection?
A: Yes — Rose Metal Industries supplies MTCs (EN 10204 3.1/3.2 or customer format) for all fittings. Third-party inspection (SGS, TUV, BV, Lloyd’s) and PMI/chemical analysis are available on request for export and critical projects.
Q3: Can you supply custom end preparations and finishes?
A: Yes — we offer beveling, facing, special end preps, polishing, passivation and custom packaging to meet project and export requirements.
Q4: Do you supply across South India and islands?
A: Yes — we supply SS 321 pipe fittings to Tamil Nadu, Andhra Pradesh, Karnataka, Telangana, Puducherry (Pondicherry) and the Andaman & Nicobar Islands, as well as to international destinations.
Q5: Which industries commonly use SS 321 fittings?
A: Common users include petrochemical, chemical processing, power plants, furnace manufacturers, marine/offshore operations, and any industry requiring welded high-temperature piping joints.