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Stainless Steel 347 | Product Overview
Introduction To Austenitic Stainless Steel 347
MOKSH TUBES & FITTINGS LLP is a leading manufacturer, supplier, exporter, importer, and stockist of Austenitic Stainless Steel 347 products including pipes & tubes, sheets, plates, bars, and fittings.
Austenitic Stainless Steel 317, is an austenitic stainless steel stabilized with niobium (columbium) and tantalum to provide excellent resistance to intergranular corrosion. It retains good mechanical properties after exposure to high temperatures and is commonly used in high-temperature environments such as boilers, heat exchangers, and furnace parts. This alloy offers improved resistance to stress corrosion cracking compared to 304 stainless steel.
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Technical Specifications – Stainless Steel 347 (UNS S34700 / EN 1.4550)
| Category | Details |
|---|---|
| Material | Austenitic Stainless Steel 347 |
| UNS No. | S34700 |
| EN / DIN | 1.4550 |
| Alloy Type | Nb-Stabilized Austenitic SS |
| Chromium | 17 – 19 % |
| Nickel | 9 – 13 % |
| Stabilizing Element | Niobium (Columbium) |
| Magnetic Properties | Non-Magnetic |
| Heat Treatable | ❌ No |
| Strengthening Method | Cold Working |
| Intergranular Corrosion | Excellent |
| High-Temperature Stability | Very Good |
| Typical Use | Boilers, Heat Exchangers, High-Temp Equipment |
Chemical Composition of Stainless Steel 347
| Element | Composition (%) |
|---|---|
| Carbon (C) | ≤ 0.08 |
| Chromium (Cr) | 17.0 – 19.0 |
| Nickel (Ni) | 9.0 – 13.0 |
| Niobium (Nb) + Tantalum (Ta) | 0.10 min. |
| Manganese (Mn) | ≤ 2.0 |
| Silicon (Si) | ≤ 1.0 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.03 |
| Nitrogen (N) | ≤ 0.10 |
Physical Properties of Stainless Steel 347
| Property | Imperial Units | Metric Units |
|---|---|---|
| Density | 0.289 lb/in³ | 8.0 g/cm³ |
| Melting Point | 2500 – 2550 °F | 1371 – 1399 °C |
| Modulus of Elasticity | 28 × 10³ ksi | 193 GPa |
| Poisson’s Ratio | 0.27 | — |
Heat Treatment & Fabrication of Stainless Steel 347
| Process | Temperature Range | Purpose |
|---|---|---|
| Solution Annealing | 1010 – 1120°C | Restore corrosion resistance |
| Cooling | Water / Rapid Air | Prevent sensitization |
| Stress Relieving | 300 – 450°C | Reduce residual stress |
| Cold Working | — | Increase strength |
| Welding | TIG / MIG / SMAW | Excellent weldability |
📌 SS 347 is preferred over SS 304 for high-temperature welded applications due to niobium stabilization.
Mechanical Properties of Stainless Steel 347 (Annealed)
| Property | Annealed | Cold-Drawn | Sheet |
|---|---|---|---|
| Tensile Strength | 485 – 620 MPa | 550 – 760 MPa | 515 – 690 MPa |
| Yield Strength (0.2%) | 205 – 345 MPa | 310 – 485 MPa | 240 – 415 MPa |
| Elongation | 40 – 60 % | 20 – 40 % | 35 – 55 % |
| Brinell Hardness | 120 – 180 | 160 – 210 | 140 – 190 |
| Rockwell Hardness | 80 – 95 B | 90 – 105 B | 85 – 95 B |
Available Forms & Size Range – Stainless Steel 347
| Product Form | Size Range |
|---|---|
| Pipes & Tubes | OD 6 – 600 mm, WT 0.8 – 40 mm |
| Sheets & Plates | 0.5 – 100 mm |
| Coils & Strips | 0.1 – 6 mm |
| Bars (Round / Flat / Hex) | Ø 6 – 350 mm |
| Wire & Mesh | Standard & custom sizes |
| Fittings & Flanges | ASME / DIN standards |
| Custom Fabrication | As per drawing |
International Standards & Equivalent Grades – SS 347
| Standard | Equivalent Grade |
|---|---|
| UNS | S34700 |
| ASTM | A240, A312, A276 |
| EN | 1.4550 |
| DIN | X6CrNiNb18-10 |
| JIS | SUS 347 |
| BS | 347S31 |
| ISO | X6CrNiNb18-10 |
Products in Austenitic Stainless Steel 347
Austenitic Stainless Steel 347 is available in:
Austenitic Stainless Steel 347 products are produced to the following global standards:
Uses and Advantages
Excellent resistance to intergranular corrosion due to niobium stabilization
Retains mechanical properties at high temperatures
Good resistance to stress corrosion cracking
Good weldability and fabricability
Suitable for use in severe environments with high temperature exposure
Applications of Austenitic Stainless Steel 347
Austenitic Stainless Steel 347 is used in environments requiring excellent resistance to intergranular corrosion and stability at elevated temperatures, including:
Power Generation
Boiler tubes, superheater tubes, heat exchangers.
Chemical & Petrochemical Industry
Processing equipment exposed to high temperatures and corrosive media.
Aerospace and Automotive
Exhaust systems, turbine components.
Food Processing
Equipment subjected to elevated temperatures and corrosive environments.
Oil & Gas
Components requiring high temperature strength and corrosion resistance.
WHY CHOOSE US?
STAINLESS STEEL 347 PRICE PER KG (INDIA)
Typical Range: ₹380 – ₹720 per kg
(Price varies by OD, wall thickness, form, and finish)
Contact us for exact quotation based on size and quantity.
FAQ's
What is Stainless Steel 347 and how is it different from 304 or 316?
Stainless Steel 347 is a niobium stabilized austenitic stainless steel offering excellent resistance to intergranular corrosion and high temperature strength. Unlike 304 or 316, SS 347 provides superior performance in elevated temperature applications such as boilers, heat exchangers, and furnace parts.
What are the key advantages of using Stainless Steel 347?
The main benefits of SS 347 include resistance to intergranular corrosion, stress corrosion cracking, and oxidation at high temperatures. It also maintains mechanical strength in severe environments, making it ideal for power generation, chemical, petrochemical, and aerospace applications.
In which industries is Stainless Steel 347 commonly used?
SS 347 is widely used in power plants, chemical and petrochemical industries, aerospace, automotive exhaust systems, oil & gas, and food processing equipment due to its durability in high temperature and corrosive environments.
What forms of Stainless Steel 347 products are available at MOKSH TUBES & FITTINGS LLP?
We supply Stainless Steel 347 in various forms such as seamless and welded pipes, tubes, sheets, plates, coils, strips, bars, pipe fittings, flanges, fasteners, and custom fabricated components, all manufactured to global quality standards.
Why should I choose MOKSH TUBES & FITTINGS LLP for Stainless Steel 347 products?
MOKSH TUBES & FITTINGS LLP is a trusted manufacturer, supplier, and exporter with a wide stock range, international certifications, competitive pricing, and timely worldwide delivery. We provide expert guidance for selecting the right SS 347 products for your application.
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For inquiries or quotes on Austenitic Stainless Steel 347 products, contact Moksh Tubes & Fittings LLP — your trusted stainless steel partner. Get in Touch