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Girgaon, Mumbai - 400004
Stainless Steel 347 Welded Pipes Manufacturer in India
What are Stainless Steel 347 Welded Pipe?
Stainless Steel 347 Welded Pipe is an austenitic stainless steel pipe manufactured by forming stainless steel strip, sheet or plate into a tubular shape and joining the edges by welding. Grade 347 is a stabilized chromium-nickel stainless steel containing columbium (niobium), which helps reduce chromium-carbide precipitation during exposure to elevated temperatures and provides improved resistance to intergranular corrosion after welding and heating.
Stainless Steel 347 Welded Pipes offer good corrosion resistance, oxidation resistance, weldability and reliable performance in elevated-temperature service. They are commonly selected for high-temperature process piping, heat exchangers, furnace equipment, chemical processing, refinery systems, exhaust applications and other industrial equipment exposed to prolonged elevated temperatures.
Kamal Steels is a Stainless Steel 347 Welded Pipe Manufacturer and Stockist in India, supplying pipes in different sizes, schedules, wall thicknesses, lengths, end preparations and surface finishes. Material Test Certificates, inspection documents, testing and export-standard packaging can be provided according to project and customer requirements.
Table of Contents
- Stainless Steel 347 Welded Pipe Specifications
- Stainless Steel 347 Welded Pipe Weight Chart
- Stainless Steel 347 Welded Pipe Size Range
- Stainless Steel 347 Welded Pipe Schedules
- Surface Finish of Stainless Steel 347 Welded Pipes
- Stainless Steel 347 Welded Pipe Manufacturing Standards
- ASTM A312 TP347 Welded Pipe
- Stainless Steel 347 Welded Pipe Chemical Composition
- Mechanical Properties of Stainless Steel 347 Welded Pipe
- High-Temperature Properties of Stainless Steel 347
- Stainless Steel 347 vs 321 Welded Pipe
- Equivalent Grades of Stainless Steel 347 Welded Pipe
- Features of Stainless Steel 347 Welded Pipes
- Stainless Steel 347 Welded Pipe Applications
- Industries Using Stainless Steel 347 Welded Pipe
- Frequently Asked Questions
Stainless Steel 347 Welded Pipe Specifications
| Product | Stainless Steel 347 Welded Pipe |
|---|---|
| Material Grade | 347 (UNS S34700) |
| Standard | ASTM A312 / ASME SA312 |
| Outside Diameter | 1/8" NB to 24" NB (6 mm to 610 mm) |
| Wall Thickness | SCH 5S to SCH XXS |
| Pipe Type | Welded, ERW, EFW & Fabricated |
| Length | Single Random, Double Random & Custom Cut Length |
| End Type | Plain End, Beveled End & Threaded |
| Surface Finish | Annealed & Pickled, Bright Annealed, 2B, No.1 & Polished |
| Inspection | Hydro Test, PMI, Radiography, Eddy Current Test & EN 10204 3.1 MTC |
Stainless Steel 347 Welded Pipe Weight Chart
The weight of Stainless Steel 347 Welded Pipes depends on the outside diameter, wall thickness and length of the pipe. The following chart provides approximate theoretical weights for commonly used pipe sizes. Actual pipe weight may vary according to dimensional tolerances, manufacturing standards and supplied length.
| Nominal Pipe Size | Outside Diameter | Wall Thickness | Approx. Weight |
|---|---|---|---|
| 1/2" NB | 21.3 mm | 2.77 mm | 1.27 kg/m |
| 1" NB | 33.4 mm | 3.38 mm | 2.54 kg/m |
| 2" NB | 60.3 mm | 3.91 mm | 5.32 kg/m |
| 3" NB | 88.9 mm | 5.49 mm | 11.29 kg/m |
| 4" NB | 114.3 mm | 6.02 mm | 16.31 kg/m |
| 6" NB | 168.3 mm | 7.11 mm | 28.83 kg/m |
| 8" NB | 219.1 mm | 8.18 mm | 43.42 kg/m |
| 10" NB | 273.0 mm | 9.27 mm | 60.76 kg/m |
| 12" NB | 323.9 mm | 9.53 mm | 72.92 kg/m |
Available Size Range
Kamal Steels manufactures Stainless Steel 347 Welded Pipes in a wide range of sizes and dimensions to meet the requirements of industrial piping systems, process applications and fabrication projects. Pipes can also be supplied in customized dimensions and cut lengths according to customer drawings and project specifications.
Available Pipe Schedules
| Pipe Schedule | Availability |
|---|---|
| SCH 5S | ✔ Available |
| SCH 10S | ✔ Available |
| SCH 20 | ✔ Available |
| SCH 40S | ✔ Available |
| SCH 60 | ✔ Available |
| SCH 80S | ✔ Available |
| SCH 120 | ✔ Available |
| SCH 160 | ✔ Available |
| XS | ✔ Available |
| XXS | ✔ Available |
Surface Finish of Stainless Steel 347 Welded Pipes
Kamal Steels supplies Stainless Steel 347 Welded Pipes in multiple surface finishes to meet the needs of industrial processing, fabrication, pharmaceutical, food processing, and architectural applications.
| Surface Finish | Description |
|---|---|
| Annealed & Pickled (AP) | Improves corrosion resistance by removing welding scale and surface impurities. |
| Bright Annealed (BA) | Produces a smooth, reflective finish with enhanced cleanliness. |
| 2B Finish | Standard cold-finished surface suitable for most industrial applications. |
| No.1 Finish | Hot rolled finish commonly used in high-temperature processing equipment. |
| Polished Finish | Available in different grit finishes for decorative and hygienic applications. |
Manufacturing Standards
Every Stainless Steel 347 Welded Pipe manufactured by Kamal Steels complies with internationally recognized specifications to ensure outstanding quality, dimensional precision, and reliable service performance.
| Standard | Description |
|---|---|
| ASTM A312 | Standard specification for seamless, welded, and cold-worked austenitic stainless steel pipes. |
| ASME SA312 | Pressure piping specification for stainless steel welded pipes. |
| ASTM A358 | Electric fusion welded stainless steel pipe for high-temperature service. |
| ASTM A778 | Specification covering welded austenitic stainless steel tubular products. |
| ASME B36.19M | Dimensions for stainless steel pipe. |
| ASME B36.10M | Dimensions for welded and seamless steel pipe. |
ASTM A312 TP347 Welded Pipe
ASTM A312 TP347 Welded Pipe is manufactured from Stainless Steel 347 material for applications requiring seamless or welded austenitic stainless steel pipe suitable for high-temperature and general corrosive service. TP347 is a stabilized grade containing columbium (niobium), which helps reduce chromium-carbide precipitation during elevated-temperature exposure.
Stainless Steel 347 Welded Pipes supplied to ASTM A312 requirements are available in different nominal sizes, wall thicknesses and schedules. The specification covers requirements related to chemical composition, mechanical properties, dimensions, heat treatment and applicable testing.
| Parameter | ASTM A312 TP347 Welded Pipe |
|---|---|
| Material Grade | Stainless Steel 347 |
| UNS Number | S34700 |
| Product Form | Welded Pipe |
| Material Type | Austenitic Stainless Steel |
| Product Specification | ASTM A312 / ASME SA312 |
| Stabilizing Element | Columbium (Niobium) |
| Service | High-Temperature and Corrosive Service |
| Certification | Material Test Certificate available as required |
Quality Assurance & Testing
Quality is the foundation of every product manufactured by Kamal Steels. Our Stainless Steel 347 Welded Pipes undergo comprehensive testing and inspection procedures to ensure compliance with customer specifications and international quality standards.
Stainless Steel 347 Welded Pipe Chemical Composition
Stainless Steel 347 is a niobium-stabilized austenitic stainless steel grade developed for improved resistance to intergranular corrosion after welding. Its balanced chemical composition delivers excellent oxidation resistance and reliable performance in elevated temperature applications.
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.08 Max |
| Manganese (Mn) | 2.00 Max |
| Silicon (Si) | 0.75 Max |
| Phosphorus (P) | 0.045 Max |
| Sulfur (S) | 0.030 Max |
| Chromium (Cr) | 17.00 – 19.00 |
| Nickel (Ni) | 9.00 – 13.00 |
| Niobium + Tantalum (Nb+Ta) | 10 × C Min – 1.00 Max |
| Nitrogen (N) | 0.10 Max |
| Iron (Fe) | Balance |
Mechanical Properties of Stainless Steel 347 Welded Pipe
SS 347 Welded Pipes combine excellent mechanical strength with superior resistance to thermal fatigue and oxidation, making them suitable for continuous service in demanding industrial environments.
| Property | Value |
|---|---|
| Tensile Strength | 515 MPa Minimum |
| Yield Strength (0.2% Offset) | 205 MPa Minimum |
| Elongation | 40% Minimum |
| Hardness | 92 HRB Maximum |
| Density | 7.96 g/cm³ |
| Melting Range | 1398 – 1446°C |
Equivalent Grades of Stainless Steel 347 Welded Pipe
| Standard | Equivalent Grade |
|---|---|
| ASTM / ASME | 347 |
| UNS | S34700 |
| Werkstoff No. | 1.4550 |
| EN | X6CrNiNb18-10 |
| JIS | SUS 347 |
| BS | 347S31 |
Features of Stainless Steel 347 Welded Pipes
Stainless Steel 347 Welded Pipe Applications
| Application | Typical Use |
|---|---|
| High-Temperature Process Piping | Process and fluid-transfer piping exposed to elevated temperatures |
| Heat Exchangers | Process connections and high-temperature heat-transfer systems |
| Furnace Equipment | High-temperature piping and fabricated furnace components |
| Exhaust Systems | High-temperature exhaust piping and related components |
| Chemical Process Piping | Corrosive-service piping exposed to elevated temperatures |
| Refinery Process Lines | Process piping and equipment operating under elevated-temperature conditions |
| Thermal Processing Equipment | Piping and components used in heat-treatment and thermal processing systems |
| Pressure Piping | Industrial pressure piping where applicable design requirements are met |
Industries Using Stainless Steel 347 Welded Pipe
| Industry | Typical Applications |
|---|---|
| Oil & Gas | Process piping, refinery systems and high-temperature service applications |
| Petrochemical | Process lines, heat-transfer systems and plant piping |
| Chemical Processing | Corrosive-service piping and elevated-temperature process equipment |
| Power Generation | High-temperature utility, process and heat-transfer systems |
| Refineries | Process piping, furnace systems and thermal equipment |
| Pharmaceutical | Selected process and utility piping applications |
| Aerospace | Selected high-temperature exhaust and fabricated components |
| Heat Exchanger Manufacturing | Heat-transfer equipment and process connection systems |
| Industrial Equipment Manufacturing | Thermal processing equipment and corrosion-resistant fabricated systems |
Frequently Asked Questions
Stainless Steel 347 Welded Pipe is a niobium-stabilized austenitic stainless steel pipe designed to resist intergranular corrosion and oxidation, especially after welding and during high-temperature service.
Niobium stabilizes the stainless steel by preventing chromium carbide precipitation during welding, which improves corrosion resistance and enhances long-term performance at elevated temperatures.
Kamal Steels manufactures Stainless Steel 347 Welded Pipes according to ASTM A312, ASME SA312, ASTM A358, ASTM A778, ASME B36.19M and other internationally recognized standards.
Our SS 347 Welded Pipes are available from 1/8" NB to 24" NB in various wall thicknesses, schedules and customized lengths to meet specific project requirements.
These pipes are widely used in petrochemical plants, refineries, chemical processing units, heat exchangers, boilers, pressure vessels and high-temperature piping systems.
Yes. Stainless Steel 347 offers excellent oxidation resistance and mechanical stability, making it suitable for continuous high-temperature service.
Each pipe undergoes hydrostatic testing, PMI, radiographic inspection, eddy current testing, dimensional verification and visual inspection before dispatch.
Yes. Every shipment is supplied with an EN 10204 3.1 Mill Test Certificate and third-party inspection certificates are available upon request.
Yes. We manufacture and supply customized welded pipes in different diameters, schedules, wall thicknesses, lengths, end preparations and surface finishes.
Kamal Steels is a trusted manufacturer, supplier, stockist and exporter offering premium-quality Stainless Steel 347 Welded Pipes with certified materials, strict quality control, competitive pricing, fast delivery, and reliable technical support for industrial projects worldwide.