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Girgaon, Mumbai - 400004
Stainless Steel 347 Seamless Tubes Manufacturer in India
What Are Stainless Steel 347 Seamless Tubes?
Stainless Steel 347 Seamless Tubes are niobium-stabilized austenitic stainless steel tubes manufactured without a longitudinal weld for applications where reliable corrosion resistance and stability during elevated-temperature service are required. Grade 347 is identified by UNS S34700 and is based on a chromium-nickel austenitic stainless steel composition with niobium added to improve resistance to intergranular corrosion after exposure to elevated temperatures.
The niobium stabilization of Stainless Steel 347 helps control chromium carbide precipitation during heating and welding, making the grade suitable for applications involving thermal cycling and prolonged exposure to elevated temperatures. It provides good general corrosion resistance together with useful high-temperature performance, while its seamless construction supports pressure and fluid-handling applications where a continuous tube structure is preferred.
Stainless Steel 347 Seamless Tubes are supplied to relevant ASTM and ASME specifications according to the intended service and product requirements. Common specifications include ASTM A213 and ASTM A269, with applicable ASME SA specifications available where required. Tubes can be supplied in different outside diameters, wall thicknesses, schedules, finishes and lengths.
These tubes are selected for heat exchangers, refinery equipment, chemical processing systems, power-generation equipment, high-temperature process lines, petrochemical plants and thermal processing equipment. The stabilized chemistry of 347 makes it particularly useful in environments where repeated heating or elevated-temperature operation could otherwise increase the risk of sensitization.
Kamal Steels is a Manufacturer and Stockist of Stainless Steel 347 Seamless Tubes, supplying standard and customized tubing for domestic and international requirements. Tubes can be provided with MTC, inspection documentation, testing reports and export-standard packaging according to project requirements.
Table of Contents
- Stainless Steel 347 Seamless Tube Specifications
- Stainless Steel 347 Seamless Tube Size Chart
- Stainless Steel 347 Seamless Tube Standards
- Stainless Steel 347 Seamless Tube Features
- Stainless Steel 347 Chemical Composition
- Stainless Steel 347 Mechanical Properties
- Stainless Steel 347 Seamless Tube Applications
- Industries Using Stainless Steel 347 Seamless Tubes
- Frequently Asked Questions
Stainless Steel 347 Seamless Tube Specifications
Stainless Steel 347 Seamless Tubes are available in different dimensions, material conditions and finishes to match applicable standards and customer requirements.
| Specification | Stainless Steel 347 Seamless Tubes |
|---|---|
| Material | Stainless Steel |
| Grade | 347 |
| UNS | S34700 |
| Tube Type | Seamless |
| ASTM Standards | ASTM A213, ASTM A269 |
| ASME Standards | ASME SA213, Applicable ASME SA Specifications |
| Outside Diameter | As per requirement |
| Wall Thickness | As per requirement |
| Schedule | As required |
| Length | Random, Fixed or Customized |
| Finish | Annealed, Pickled, Bright Annealed, Polished or As required |
| Form | Round Tube |
Stainless Steel 347 Seamless Tube Size Chart
Stainless Steel 347 Seamless Tubes are available in different outside diameters and wall thicknesses. Standard and customized dimensions can be supplied based on equipment design, pressure, temperature and service 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 Seamless Tube Standards
The applicable specification is selected according to the intended application, dimensions, manufacturing requirements and service conditions. Common standards include:
| Standard | Application / Product Requirement |
|---|---|
| ASTM A213 | Seamless ferritic and austenitic alloy-steel boiler, superheater and heat-exchanger tubes |
| ASTM A269 | Seamless and welded austenitic stainless steel tubing for general corrosion-resisting service |
| ASME SA213 | Applicable seamless ferritic and austenitic alloy-steel tubing requirements |
| ASME SA269 | Applicable austenitic stainless steel tubing requirements for general service |
Stainless Steel 347 Seamless Tube Features
The stabilized structure of Stainless Steel 347 gives these seamless tubes useful performance in applications involving elevated temperatures, thermal cycling and corrosive service conditions.
- Niobium-stabilized austenitic stainless steel
- Good resistance to intergranular corrosion
- Good performance during elevated-temperature exposure
- Excellent resistance to sensitization after heating
- Good general corrosion resistance
- Suitable for repeated thermal cycling
- Good oxidation resistance at elevated temperatures
- Good weldability and fabrication characteristics
- Suitable for pressure and fluid-handling applications
- Available in different sizes, wall thicknesses and finishes
Stainless Steel 347 Chemical Composition
The chemical composition of 347 combines chromium and nickel with a controlled niobium addition. This stabilization helps the material maintain corrosion resistance following exposure to elevated temperatures.
| 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 provides a balance of strength, ductility and corrosion resistance, with its stabilized chemistry supporting reliable performance in elevated-temperature environments. Typical minimum mechanical requirements include:
| Property | Minimum Requirement |
|---|---|
| Tensile Strength | 515 MPa min. |
| Yield Strength | 205 MPa min. |
| Elongation | 40% min. |
| Density | Approx. 8.0 g/cm³ |
Note: Final mechanical values should be verified against the applicable material specification, dimensions and material test certificate.
Stainless Steel 347 Seamless Tube Applications
The combination of niobium stabilization, corrosion resistance and thermal stability makes Stainless Steel 347 Seamless Tubes suitable for equipment exposed to heat and corrosive process conditions.
Power Generation
Used in selected high-temperature equipment and process systems in power-generation facilities.
Heat Exchangers
Suitable for heat-transfer equipment operating under elevated-temperature conditions.
Refinery Equipment
Used in refinery process equipment exposed to heat and corrosive process media.
Chemical Processing
Used in process systems requiring stabilized stainless steel tubing for thermal service.
Thermal Processing
Used in tubular equipment subjected to heating, cooling and repeated thermal cycles.
Petrochemical Systems
Used in selected high-temperature process and fluid-handling applications.
Industries Using Stainless Steel 347 Seamless Tubes
Stainless Steel 347 seamless tubing is used across industries where equipment requires corrosion resistance together with stability during elevated-temperature operation.
Power Industry
Used in selected high-temperature process and power-generation equipment.
Refinery Industry
Used in process systems exposed to elevated temperatures and corrosive media.
Chemical Industry
Used in equipment requiring stabilized stainless steel tubing for demanding service.
Petrochemical Industry
Used in process and fluid-handling systems involving thermal exposure.
Heat Processing Industry
Used in equipment subjected to repeated heating and thermal cycling.
Engineering Industry
Used in specialized tubular systems designed for elevated-temperature operation.
Frequently Asked Questions
Stainless Steel 347 Seamless Tubes are niobium (columbium)-stabilized austenitic stainless steel tubes manufactured from Stainless Steel 347 (UNS S34700 / WNR 1.4550). They offer excellent corrosion resistance, superior oxidation resistance, and outstanding performance in elevated-temperature applications.
Our Stainless Steel 347 Seamless Tubes are manufactured according to ASTM A213, ASTM A269, ASME SA213, and ASME SA269 international standards.
SS 347 Seamless Tubes provide excellent resistance to oxidation, scaling, thermal fatigue, and intergranular corrosion while maintaining high mechanical strength and excellent weldability for elevated-temperature service.
They are widely used in boilers, heat exchangers, petrochemical plants, refineries, aerospace exhaust systems, nuclear facilities, chemical processing industries, and power generation plants.
SS 347 Seamless Tubes are available in various outside diameters, wall thicknesses, schedules, surface finishes, and custom cut lengths to meet diverse industrial requirements.
Each tube undergoes Hydrostatic Testing, Ultrasonic Testing (UT), Eddy Current Testing (ECT), Positive Material Identification (PMI), Chemical Analysis, Mechanical Testing, Flattening Test, Flaring Test, Intergranular Corrosion (IGC) Testing, and Dimensional Inspection.
SS 347 is stabilized with niobium (columbium), whereas SS 321 is stabilized with titanium. Both grades resist intergranular corrosion, but SS 347 is often preferred for prolonged high-temperature applications because of its excellent thermal stability.
Yes. Every shipment includes EN 10204 3.1 Mill Test Certificates, inspection reports, complete material traceability, and third-party inspection certificates upon request.
Yes. Kamal Steels exports Stainless Steel 347 Seamless Tubes worldwide with export-standard packaging, complete documentation, and timely international delivery.
Kamal Steels offers ASTM-compliant Stainless Steel 347 Seamless 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.