Stainless Steel 347 Pipe
Rose Metal Industries is a leading manufacturer, stockist, and global exporter of Stainless Steel 347 Pipes, supplying premium-quality piping solutions for industries requiring high-temperature and corrosion-resistant materials. SS 347 is a niobium-stabilized austenitic stainless steel that offers excellent resistance to intergranular corrosion after exposure to high temperatures. With strong manufacturing capability and extensive ready stock, Rose Metal Industries delivers SS 347 pipes across Tamilnadu, Andhra Pradesh, Karnataka, Telangana, Puducherry (Pondicherry), and the Andaman & Nicobar Islands, as well as major global markets..
Stainless Steel 347 Pipes are widely preferred in industries operating in extreme temperature ranges, thanks to their exceptional stability against chromium carbide precipitation. The niobium stabilization ensures that the steel remains resistant to sensitization, even during welding or prolonged exposure to temperatures between 425°C and 850°C. Rose Metal Industries produces seamless, welded, ERW, and EFW 347 pipes, maintaining strict international standards such as ASTM A312 / ASME SA312, making them suitable for petrochemical plants, refineries, and thermal power facilities..
Industrial hubs like Chennai, Coimbatore, Visakhapatnam, Hyderabad, Bengaluru, Mysuru, Vijayawada, and Port Blair rely heavily on corrosion-resistant stainless steel products due to coastal conditions and high industrial loads. Rose Metal Industries supplies SS 347 pipes to critical sectors in these regions, offering reliable quality, quick deliveries, and complete documentation. The material’s high creep strength and resistance to oxidation make it ideal for boiler tubes, heat exchanger systems, furnace components, and other high-pressure applications..
The company maintains a strong inventory of multiple pipe sizes, wall thicknesses, and schedules, including Sch 10, Sch 40, Sch 80, and custom thicknesses. This allows Rose Metal Industries to support urgent project requirements and large-scale industrial deployments. With advanced finishing processes such as pickling, passivation, and polishing, SS 347 pipes are delivered with a smooth, corrosion-free surface suitable for food processing, pharmaceuticals, and chemical transfer lines..
Specifications
| Property | Typical Value / Standard |
|---|---|
| Grade | Stainless Steel 347 (AISI/UNS S34700) |
| Standards | ASTM A312 / ASME SA312, ASTM A213 (where applicable), EN 1.4550 (approx. equivalent) |
| Forms available | Seamless pipe, ERW welded pipe, EFW welded pipe, custom-cut lengths |
| Surface finish | Mill finish, pickled & passivated, polished (on request) |
| Supply range | NPS 1/2" to 12" (and larger on request), various schedules - Sch 10, Sch 40, Sch 80, Sch XS |
Chemical Composition (Typical)
| Element | Typical % (approx.) |
|---|---|
| Carbon (C) | ≤ 0.08 |
| Chromium (Cr) | 17.0 – 19.0 |
| Nickel (Ni) | 9.0 – 13.0 |
| Manganese (Mn) | ≤ 2.0 |
| Silicon (Si) | ≤ 1.0 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.03 |
| Niobium + Tantalum (Nb + Ta) | ≥ 0.10 (stabilizing addition; typical 0.10–1.0) |
| Iron (Fe) | Balance |
Mechanical Properties (Typical, Annealed)
| Property | Typical Value |
|---|---|
| Tensile strength (UTS) | ~ 515 – 700 MPa (depending on product form & processing) |
| Yield strength (0.2% offset) | ~ 205 – 275 MPa |
| Elongation (in 50 mm) | ≥ 35 – 45% |
| Hardness (HV) | Typically ≤ 200 HV (annealed condition) |
| Operating Temperature | Good performance up to ~800°C for intermittent service; consult engineering for continuous high-temp service |
Equivalent Grades
- UNS: S34700
- EN (approx.): 1.4550 (check specific standard tables for direct mapping)
- AISI/ASTM designation: 347 / ASTM A312 TP347
Dimension Chart — Common Pipe Sizes
Below are common nominal pipe sizes (NPS), outside diameters and typical Schedule 40 wall thicknesses — Rose Metal Industries can supply other schedules and custom thicknesses on request.
| NPS (Nominal) | Outside Diameter (OD) | Typical Wall (Sch 40) |
|---|---|---|
| 1/2" | 21.3 mm | 2.77 mm (Sch 40) |
| 3/4" | 26.7 mm | 2.87 mm (Sch 40) |
| 1" | 33.4 mm | 3.38 mm (Sch 40) |
| 1 1/2" | 48.3 mm | 3.68 mm (Sch 40) |
| 2" | 60.3 mm | 3.91 mm (Sch 40) |
| 3" | 88.9 mm | 5.49 mm (Sch 40) |
| 4" | 114.3 mm | 6.02 mm (Sch 40) |
| 6" | 168.3 mm | 7.11 mm (Sch 40) |
| 8" | 219.1 mm | 8.18 mm (Sch 40) |
| 10" | 273.1 mm | 9.27 mm (Sch 40) |
| 12" | 323.9 mm | 10.31 mm (Sch 40) |
Typical Applications
- Boilers, superheaters, and heat exchanger tubing
- Furnace and oven components
- Petrochemical process piping, refinery equipment
- Pressure vessels and structural piping in high-temperature services
- Coastal and offshore installations where stabilization against sensitization is important
- Food processing and pharmaceutical piping where high-temperature cleaning cycles occur
Stainless Steel 347 Pipes are also preferred in chemical and petrochemical processing units due to their resistance to acidic, alkaline, and oxidizing environments. The alloy performs reliably in environments containing nitric acid and other strong oxidizers. Industries in coastal states like Tamilnadu, Karnataka, Puducherry, and the Andaman & Nicobar Islands, where humidity and salinity levels are high, benefit significantly from the alloy’s corrosion resistance and long service life..
As a dedicated supplier and exporter, Rose Metal Industries ensures that every batch of SS 347 pipes undergoes stringent quality checks including chemical analysis, mechanical testing, hardness testing, hydrostatic testing, and NDT examinations. Mill Test Certificates (MTC) as per EN 10204 3.1 / 3.2 are provided for export shipments, ensuring transparency and traceability. The company caters to domestic clients and also exports SS 347 pipes to global markets across the Middle East, Africa, Europe, and Southeast Asia..
Frequently Asked Questions (FAQ)
Q1: What makes Stainless Steel 347 Pipe different from standard 304/316 grades?
A: SS 347 is stabilized with niobium, which prevents carbide precipitation during high-temperature exposure and welding. This makes it superior to 304/316 for continuous service above 425°C and for applications requiring resistance to intergranular corrosion.
Q2: Do you provide Mill Test Certificates (MTC) with SS 347 Pipes?
A: Yes — Rose Metal Industries provides MTCs as per EN 10204 3.1/3.2 along with chemical composition, mechanical test results, and heat numbers. Third-party inspection (TPI) and PMI testing can also be arranged on request.
Q3: What standards do your Stainless Steel 347 Pipes comply with?
A: Our SS 347 Pipes are supplied according to ASTM A312 / ASME SA312, ASTM A213 (where applicable), and equivalent international standards. We meet global export requirements for industrial projects.
Q4: Can you supply custom sizes, schedules, and finishes?
A: Yes — we offer customized OD, wall thickness (Sch 10, 20, 40, 80, XS), lengths, and finishes such as pickled & passivated or polished. Custom tolerances and fabrication support are available upon request.
Q5: Do you deliver to Tamilnadu, Andhra Pradesh, Karnataka, Telangana, Puducherry and Andaman & Nicobar Islands?
A: Yes — Rose Metal Industries supplies SS 347 Pipes across South India including Chennai, Coimbatore, Bengaluru, Hyderabad, Visakhapatnam, Puducherry, Port Blair and all nearby industrial zones, as well as to global markets.