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Girgaon, Mumbai - 400004
Stainless Steel 347H Welded Tubes Manufacturer in India
What Are Stainless Steel 347H Welded Tubes?
Stainless Steel 347H Welded Tubes are high-carbon, niobium-stabilized austenitic stainless steel tubes designed for improved strength and reliable performance at elevated temperatures. Grade 347H, identified by UNS S34709, combines the corrosion resistance of the 347 grade with higher carbon content for enhanced high-temperature strength.
The addition of niobium stabilizes the alloy and helps reduce chromium carbide precipitation during elevated-temperature exposure. The controlled higher carbon content provides improved creep and stress-rupture properties, making Stainless Steel 347H suitable for welded tube applications involving prolonged high-temperature service.
Stainless Steel 347H 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 347H Welded Tubes are commonly used in heat exchangers, power generation equipment, refinery systems, chemical processing equipment, aerospace components and high-temperature process applications. Their combination of niobium stabilization, corrosion resistance and elevated-temperature strength makes them suitable for demanding service conditions.
Kamal Steels is a reliable Stainless Steel 347H 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 347H Welded Tube Specifications
- Stainless Steel 347H Welded Tube Size Chart
- Stainless Steel 347H Welded Tube Standards
- Stainless Steel 347H Welded Tube Features
- Stainless Steel 347H Chemical Composition
- Stainless Steel 347H Mechanical Properties
- Stainless Steel 347H Welded Tube Applications
- Industries Using Stainless Steel 347H Welded Tubes
- Frequently Asked Questions
Stainless Steel 347H Welded Tube Specifications
Stainless Steel 347H Welded Tubes are supplied in different dimensions and material conditions according to applicable standards and customer requirements.
| Specification | Stainless Steel 347H Welded Tubes |
|---|---|
| Material | Stainless Steel |
| Grade | 347H |
| UNS | S34709 |
| 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 347H Welded Tube Size Chart
Stainless Steel 347H Welded Tubes are available in various outside diameters and wall thicknesses for high-temperature process and industrial 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 347H Welded Tube Standards
Stainless Steel 347H 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 347H Welded Tube Features
Stainless Steel 347H combines niobium stabilization with controlled higher carbon content, providing improved strength and reliable performance during prolonged elevated-temperature service.
- Excellent resistance to general corrosion
- Good resistance to intergranular corrosion
- Niobium-stabilized stainless steel grade
- Enhanced high-temperature strength
- Improved creep resistance
- Good stress-rupture properties
- Good resistance to oxidation
- Suitable for prolonged elevated-temperature service
- Good weldability and fabrication characteristics
- Available in different sizes, wall thicknesses and finishes
Stainless Steel 347H Chemical Composition
The chemical composition of Stainless Steel 347H includes chromium and nickel with niobium added for stabilization. Its controlled higher carbon content contributes to improved strength during elevated-temperature service.
| Element | Composition (%) |
|---|---|
| Chromium | 17.0 - 19.0 |
| Nickel | 9.0 - 13.0 |
| Niobium + Tantalum | 8 × C min. to 1.00 max. |
| Carbon | 0.04 - 0.10 |
| Manganese | 2.00 max. |
| Silicon | 1.00 max. |
| Phosphorus | 0.045 max. |
| Sulfur | 0.030 max. |
| Iron | Balance |
Stainless Steel 347H Mechanical Properties
Stainless Steel 347H provides good mechanical strength with improved high-temperature performance. 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 347H Welded Tube Applications
Stainless Steel 347H Welded Tubes are selected for applications requiring corrosion resistance, welded fabrication and improved mechanical performance during elevated-temperature service.
Heat Exchangers
Used in heat-transfer equipment operating under elevated-temperature conditions.
Power Generation
Used in high-temperature process and auxiliary equipment requiring enhanced material strength.
Refinery Equipment
Used in selected refinery systems exposed to elevated temperatures and corrosive process conditions.
Chemical Processing
Used in process equipment requiring corrosion-resistant tubing for demanding thermal service.
Aerospace Equipment
Used in selected aerospace components exposed to elevated temperatures and thermal cycling.
Industrial Equipment
Used in fabricated tubular components requiring corrosion resistance and high-temperature stability.
Industries Using Stainless Steel 347H Welded Tubes
Stainless Steel 347H Welded Tubes are supplied to industries requiring corrosion-resistant tubing with improved strength for prolonged elevated-temperature applications.
Power Industry
Used in high-temperature equipment and auxiliary systems requiring enhanced material strength.
Refinery Industry
Used in selected refinery equipment exposed to elevated-temperature and corrosive conditions.
Chemical Industry
Used in process equipment and tubular systems requiring corrosion resistance and 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.
Industrial Equipment Industry
Used in tubular components requiring corrosion resistance and improved high-temperature performance.
Frequently Asked Questions
Stainless Steel 347H Welded Tubes are high-carbon, niobium (columbium)-stabilized austenitic stainless steel tubes designed for elevated-temperature applications requiring enhanced creep strength, excellent oxidation resistance, and superior mechanical stability.
Our Stainless Steel 347H Welded Tubes are manufactured according to ASTM A249, ASTM A269, ASTM A270, ASTM A554, ASME SA249, and ASME SA269 standards.
These welded tubes provide enhanced creep strength, excellent oxidation resistance, superior resistance to thermal fatigue, outstanding weldability, and reliable long-term performance in continuous high-temperature environments.
They are widely used in thermal power plants, petrochemical facilities, oil refineries, industrial boilers, superheaters, heat exchangers, pressure vessels, industrial furnaces, and steam generation systems.
Stainless Steel 347H contains a higher carbon content than SS 347, providing improved creep resistance and enhanced mechanical strength during prolonged exposure to elevated temperatures while maintaining excellent resistance to intergranular corrosion.
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 347H Welded Tubes in various diameters, wall thicknesses, surface finishes, standard lengths, and custom-cut lengths according to customer specifications.
Yes. We export Stainless Steel 347H Welded Tubes worldwide with export-standard packaging, complete documentation, and timely international delivery.
Kamal Steels offers ASTM-compliant Stainless Steel 347H 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.