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Girgaon, Mumbai - 400004
Stainless Steel 347 Welded Pipes
Stainless Steel 347 Welded Pipe Manufacturer & Stockist in India
Industrial applications involving extensive welding and continuous high-temperature operation require materials that can resist sensitization without compromising corrosion performance. Kamal Steels manufactures and stocks Stainless Steel 347 Welded Pipes designed to perform reliably in such demanding environments. Manufactured in accordance with ASTM A312 and ASME SA312 standards using Stainless Steel 347 (UNS S34700 / WNR 1.4550), our welded pipes offer excellent resistance to intergranular corrosion, dependable weld integrity, and long-term durability for critical industrial piping systems.
The niobium (columbium) stabilized composition of Stainless Steel 347 prevents chromium carbide precipitation during welding and prolonged exposure to elevated temperatures, helping preserve the alloy's corrosion resistance and mechanical properties. This makes SS 347 Welded Pipes a preferred choice for refineries, petrochemical plants, chemical processing units, heat exchangers, pressure vessels, power generation facilities, and other process industries where welded components are exposed to thermal cycling and corrosive media.
Every Stainless Steel 347 Welded Pipe manufactured by Kamal Steels is produced from certified raw materials and undergoes rigorous quality inspections, including weld quality verification, dimensional inspection, hydrostatic testing and complete material traceability. Supported by extensive ready stock, project-specific manufacturing capabilities, and timely delivery, we provide reliable welded piping solutions that meet the performance requirements of customers across India and international markets.
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 |
Features & Benefits of Stainless Steel 347 Welded Pipes
Applications of Stainless Steel 347 Welded Pipes
Stainless Steel 347 Welded Pipes are widely used in industries where excellent resistance to heat, oxidation, and corrosion is essential for long-term reliability and safety.
Kamal Steels supplies Stainless Steel 347 Welded Pipes in standard as well as customized dimensions to meet the exact requirements of industrial projects. Our commitment to quality, timely delivery, and customer satisfaction has made us a preferred supplier for clients across domestic and international markets.
Available Size Range
Kamal Steels manufactures Stainless Steel 347 Welded Pipes in a wide range of dimensions to suit industrial piping systems, pressure applications, and fabrication requirements. Customized sizes are also available according to 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. |
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 |
Why Choose Kamal Steels?
Kamal Steels is committed to supplying Stainless Steel 347 Welded Pipes that deliver consistent quality and dependable performance in critical industrial applications. We utilize certified raw materials, precision manufacturing techniques, and stringent quality control procedures to ensure every pipe meets international standards. Our extensive inventory, customization capabilities, competitive pricing, prompt delivery schedules, and dedicated customer support enable us to serve clients across India and global markets with confidence.
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.