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Girgaon, Mumbai - 400004
Stainless Steel 347 Welded Tubes Manufacturer in India
What Are Stainless Steel 347 Welded Tubes?
Stainless Steel 347 Welded Tubes are stabilized austenitic stainless steel tubes containing chromium, nickel and niobium. Grade 347, identified by UNS S34700, is designed to provide good corrosion resistance and improved resistance to intergranular corrosion after exposure to elevated temperatures.
The addition of niobium stabilizes the stainless steel structure and helps reduce chromium carbide precipitation during welding and high-temperature service. This makes Stainless Steel 347 suitable for welded tube applications where resistance to sensitization and reliable performance under thermal cycling are required.
Stainless Steel 347 Welded Tubes can be supplied according to applicable ASTM and ASME specifications, depending on product form, dimensions and service requirements. These tubes are available in different outside diameters, wall thicknesses, lengths and finishes to meet specific industrial requirements.
Stainless Steel 347 Welded Tubes are commonly used in heat exchangers, chemical processing equipment, power generation systems, aerospace components, refinery equipment and high-temperature process applications. Their combination of corrosion resistance, weldability and thermal stability makes them suitable for demanding service conditions.
Kamal Steels is a reliable Stainless Steel 347 Welded Tubes Manufacturer and Stockist in India, supplying tubes in different sizes, wall thicknesses, lengths and finishes. We cater to domestic and international requirements with suitable MTC, inspection documentation and export packaging.
Table of Contents
- Stainless Steel 347 Welded Tube Specifications
- Stainless Steel 347 Welded Tube Size Chart
- Stainless Steel 347 Welded Tube Standards
- Stainless Steel 347 Welded Tube Features
- Stainless Steel 347 Chemical Composition
- Stainless Steel 347 Mechanical Properties
- Stainless Steel 347 Welded Tube Applications
- Industries Using Stainless Steel 347 Welded Tubes
- Frequently Asked Questions
Stainless Steel 347 Welded Tube Specifications
Stainless Steel 347 Welded Tubes are supplied in different dimensions and material conditions according to applicable standards and customer requirements.
| Specification | Stainless Steel 347 Welded Tubes |
|---|---|
| Material | Stainless Steel |
| Grade | 347 |
| UNS | S34700 |
| Tube Type | Welded |
| ASTM Standard | ASTM A249 / Applicable ASTM Specification |
| ASME Standard | ASME SA249 / Applicable ASME Specification |
| Outside Diameter | As per requirement |
| Wall Thickness | As per requirement |
| Schedule | As required |
| Length | Random, Fixed or Customized |
| Finish | Annealed, Pickled, Polished or As required |
Stainless Steel 347 Welded Tube Size Chart
Stainless Steel 347 Welded Tubes are available in various outside diameters and wall thicknesses for process, fabrication and elevated-temperature applications. Customized dimensions and lengths can also be supplied according to project requirements.
| Tube Size | Outside Diameter (mm) | Wall Thickness | Length |
|---|---|---|---|
| 1/2" | 12.70 | As required | As required |
| 3/4" | 19.05 | As required | As required |
| 1" | 25.40 | As required | As required |
| 1-1/2" | 38.10 | As required | As required |
| 2" | 50.80 | As required | As required |
| 3" | 76.20 | As required | As required |
| 4" | 101.60 | As required | As required |
| 6" | 152.40 | As required | As required |
| 8" | 203.20 | As required | As required |
Stainless Steel 347 Welded Tube Standards
Stainless Steel 347 Welded Tubes can be supplied according to applicable ASTM and ASME requirements based on product form, dimensions and service conditions.
| Standard | Application / Product Requirement |
|---|---|
| ASTM A249 | Welded austenitic stainless steel tubes for heat exchangers, boilers and condensers |
| ASTM A269 | Seamless and welded austenitic stainless steel tubing for general corrosion-resisting service |
| ASME SA249 | Applicable welded austenitic stainless steel tubing requirements |
| ASME SA269 | Applicable austenitic stainless steel tubing requirements for general service |
Stainless Steel 347 Welded Tube Features
Stainless Steel 347 combines niobium stabilization with austenitic stainless steel chemistry, providing reliable corrosion resistance and performance during elevated-temperature exposure.
- Excellent resistance to general corrosion
- Good resistance to intergranular corrosion
- Niobium-stabilized stainless steel grade
- Good elevated-temperature performance
- Good resistance to oxidation
- Excellent weldability
- Good strength and toughness
- Suitable for repeated thermal exposure
- Good fabrication characteristics
- Available in different sizes, wall thicknesses and finishes
Stainless Steel 347 Chemical Composition
The chemical composition of Stainless Steel 347 includes chromium and nickel with niobium added as a stabilizing element. This composition helps provide corrosion resistance and improved resistance to sensitization during elevated-temperature exposure.
| Element | Composition (%) |
|---|---|
| Chromium | 17.0 - 19.0 |
| Nickel | 9.0 - 13.0 |
| Niobium + Tantalum | 10 × C min. to 1.00 max. |
| Carbon | 0.08 max. |
| Manganese | 2.00 max. |
| Silicon | 1.00 max. |
| Phosphorus | 0.045 max. |
| Sulfur | 0.030 max. |
| Iron | Balance |
Stainless Steel 347 Mechanical Properties
Stainless Steel 347 offers a combination of strength, ductility and corrosion resistance for applications involving elevated-temperature exposure. Mechanical requirements depend on product dimensions, material condition and applicable specification.
| Property | Minimum Requirement |
|---|---|
| Tensile Strength | 515 MPa min. |
| Yield Strength | 205 MPa min. |
| Elongation | 40% min. |
| Density | Approx. 8.0 g/cm³ |
Note: Mechanical properties may vary according to product form, dimensions, heat treatment and applicable specification. Final values should be confirmed from the relevant material test certificate.
Stainless Steel 347 Welded Tube Applications
Stainless Steel 347 Welded Tubes are selected for applications requiring corrosion resistance, welded fabrication and reliable performance under elevated-temperature conditions.
Heat Exchangers
Used in heat-transfer equipment exposed to elevated temperatures and thermal cycling.
Chemical Processing
Used in selected process equipment requiring corrosion-resistant stainless steel tubing.
Power Generation
Used in selected high-temperature process and auxiliary equipment.
Aerospace Equipment
Used in selected aerospace components and systems requiring thermal stability.
Refinery Equipment
Used in selected process equipment exposed to elevated temperatures and corrosive conditions.
Industrial Equipment
Used in fabricated tubular components requiring corrosion resistance and thermal stability.
Industries Using Stainless Steel 347 Welded Tubes
Stainless Steel 347 Welded Tubes are supplied to industries requiring corrosion-resistant tubing for elevated-temperature and thermally demanding applications.
Chemical Industry
Used in selected process equipment exposed to corrosive and elevated-temperature conditions.
Power Industry
Used in high-temperature equipment and auxiliary systems requiring thermal stability.
Aerospace Industry
Used in selected aerospace components and systems exposed to elevated temperatures.
Engineering Industry
Used in fabricated equipment and tubular systems designed for demanding thermal service.
Refinery Industry
Used in selected refinery equipment requiring corrosion resistance and thermal stability.
Industrial Equipment Industry
Used in tubular components requiring corrosion resistance and reliable high-temperature performance.
Frequently Asked Questions
Stainless Steel 347 Welded Tubes are niobium (columbium)-stabilized austenitic stainless steel tubes manufactured using advanced welding technology. They are specifically designed for elevated-temperature applications requiring excellent oxidation resistance, superior weld stability, and resistance to intergranular corrosion.
Our Stainless Steel 347 Welded Tubes are manufactured according to ASTM A249, ASTM A269, ASTM A270, ASTM A554, ASME SA249, and ASME SA269 standards.
These welded tubes provide excellent oxidation resistance, superior resistance to thermal fatigue, outstanding weldability, high-temperature strength, and excellent protection against intergranular corrosion.
They are widely used in petrochemical plants, power generation facilities, oil refineries, nuclear power plants, aerospace industries, boilers, heat exchangers, pressure vessels, industrial furnaces, and exhaust systems.
Niobium stabilizes the stainless steel by preventing chromium carbide precipitation during welding and prolonged heating, significantly improving resistance to intergranular corrosion while maintaining excellent high-temperature strength.
Each tube undergoes PMI Testing, Chemical Analysis, Mechanical Testing, Hydrostatic Testing, Ultrasonic Testing (UT), Eddy Current Testing (ECT), Dimensional Inspection, Surface Finish Inspection, and Visual Inspection.
Yes. Every shipment includes EN 10204 3.1/3.2 Mill Test Certificates, inspection reports, complete material traceability, and third-party inspection certificates upon request.
Yes. Kamal Steels supplies Stainless Steel 347 Welded Tubes in various diameters, wall thicknesses, surface finishes, standard lengths, and custom-cut lengths according to customer specifications.
Yes. We export Stainless Steel 347 Welded Tubes worldwide with export-standard packaging, complete documentation, and timely international delivery.
Kamal Steels offers ASTM-compliant Stainless Steel 347 Welded Tubes with ready stock, certified quality, competitive pricing, stringent quality control, export-standard packaging, complete documentation, and dependable worldwide delivery for critical high-temperature industrial applications.