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Girgaon, Mumbai - 400004
Stainless Steel 347H Welded Pipes Manufacturer in India
Stainless Steel 347H Welded Pipe Manufacturer & Stockist in India
High-temperature processing industries require piping materials that can withstand prolonged thermal exposure without compromising mechanical strength or corrosion resistance. Kamal Steels manufactures and stocks Stainless Steel 347H Welded Pipes engineered for applications where elevated temperatures, pressure and continuous service demand exceptional material performance. Manufactured in accordance with ASTM A312 and ASME SA312 standards using Stainless Steel 347H (UNS S34709 / WNR 1.4961), our welded pipes offer outstanding creep strength, oxidation resistance and long-term structural stability for critical industrial operations.
Stainless Steel 347H is a high-carbon, niobium-stabilized austenitic stainless steel developed specifically for elevated-temperature service. The combination of controlled carbon content and niobium stabilization improves resistance to intergranular corrosion, enhances stress rupture strength, and helps maintain mechanical integrity during prolonged exposure to heat. These characteristics make SS 347H Welded Pipes an excellent choice for boilers, superheaters, heat exchangers, refinery units, petrochemical plants, power generation facilities, furnace equipment and other demanding thermal processing applications.
Every Stainless Steel 347H Welded Pipe manufactured by Kamal Steels is produced using certified raw materials and undergoes comprehensive quality inspections, including weld integrity verification, dimensional accuracy checks, hydrostatic testing and complete material traceability. Supported by extensive ready stock, project-specific manufacturing capabilities and timely delivery, we supply dependable welded piping solutions that meet the performance expectations of customers across India and international markets.
Stainless Steel 347H Welded Pipe Specifications
| Product | Stainless Steel 347H Welded Pipe |
|---|---|
| Material Grade | 347H (UNS S34709 / WNR 1.4961) |
| Standards | 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 (AP), Bright Annealed (BA), 2B, No.1 & Polished |
| Inspection | Hydro Test, PMI, Radiography, Eddy Current Test & EN 10204 3.1 MTC |
Features & Benefits of Stainless Steel 347H Welded Pipes
Applications of Stainless Steel 347H Welded Pipes
Stainless Steel 347H Welded Pipes are widely used in high-temperature industrial systems where superior oxidation resistance, creep strength, and long-term reliability are essential.
Available Size Range
Kamal Steels offers Stainless Steel 347H Welded Pipes in a comprehensive range of sizes and wall thicknesses to meet the requirements of process piping, pressure systems, fabrication, and high-temperature industrial installations. Custom dimensions are also available to suit project-specific applications.
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
To satisfy different industrial and fabrication requirements, Stainless Steel 347H Welded Pipes are supplied in multiple surface finishes. Each finish enhances the pipe's appearance, corrosion resistance, and suitability for specific operating environments.
| Surface Finish | Description |
|---|---|
| Annealed & Pickled (AP) | Heat-treated and chemically cleaned for improved corrosion resistance. |
| Bright Annealed (BA) | Smooth, bright finish produced in a controlled atmosphere. |
| 2B Finish | Standard cold-rolled finish widely used for industrial piping applications. |
| No.1 Finish | Hot-rolled finish suitable for high-temperature process equipment. |
| Polished Finish | Available in various grit finishes for decorative and hygienic installations. |
Manufacturing Standards
Kamal Steels manufactures Stainless Steel 347H Welded Pipes in accordance with globally accepted specifications to ensure dimensional consistency, product reliability, and compliance with international quality requirements.
| Standard | Description |
|---|---|
| ASTM A312 | Specification for seamless, welded, and heavily cold-worked stainless steel pipes. |
| ASME SA312 | Pressure piping specification for austenitic stainless steel pipes. |
| ASTM A358 | Electric fusion welded stainless steel pipe for elevated temperature service. |
| ASTM A778 | Specification covering welded austenitic stainless steel tubular products. |
| ASME B36.19M | Dimensions for stainless steel pipes. |
| ASME B36.10M | Dimensions for welded and seamless steel pipes. |
Quality Assurance & Testing
Every Stainless Steel 347H Welded Pipe supplied by Kamal Steels is subjected to detailed inspection and testing before dispatch. Our quality assurance process verifies material integrity, dimensional accuracy, and compliance with applicable ASTM and ASME standards.
Stainless Steel 347H Welded Pipe Chemical Composition
Stainless Steel 347H is a high-carbon, niobium-stabilized austenitic stainless steel developed for elevated temperature service. Its controlled chemical composition enhances creep strength, oxidation resistance, and long-term structural stability while maintaining excellent weldability.
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.04 – 0.10 |
| 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) | 8 x C Min – 1.00 Max |
| Nitrogen (N) | 0.10 Max |
| Iron (Fe) | Balance |
Mechanical Properties of Stainless Steel 347H Welded Pipe
The enhanced carbon content of Stainless Steel 347H provides improved mechanical strength and creep resistance, making it suitable for prolonged operation under high-temperature conditions.
| Property | Value |
|---|---|
| Tensile Strength | 515 MPa Minimum |
| Yield Strength (0.2% Offset) | 205 MPa Minimum |
| Elongation | 40% Minimum |
| Hardness | 201 HB Maximum |
| Density | 7.96 g/cm³ |
| Melting Range | 1398 – 1446°C |
Equivalent Grades of Stainless Steel 347H Welded Pipe
| Standard | Grade |
|---|---|
| ASTM / ASME | 347H |
| UNS | S34709 |
| Werkstoff No. | 1.4961 |
| EN | X7CrNiNb18-10 |
| JIS | SUS 347H |
| ISO | 347H |
Why Choose Kamal Steels?
Kamal Steels is committed to supplying Stainless Steel 347H Welded Pipes that meet the highest standards of quality, performance, and reliability. Our manufacturing process utilizes certified raw materials, advanced production technology, and rigorous quality inspections to ensure every pipe delivers consistent results in demanding industrial applications. With an extensive inventory, customized manufacturing capabilities, competitive pricing, timely delivery, and complete inspection documentation, we provide dependable piping solutions for customers across India and international markets.
Frequently Asked Questions
Stainless Steel 347H Welded Pipe is a high-carbon, niobium-stabilized austenitic stainless steel pipe designed for elevated temperature applications requiring improved creep strength and oxidation resistance.
SS 347H contains a higher carbon content than standard SS 347, providing better high-temperature strength and improved creep resistance during prolonged service.
These pipes are manufactured according to ASTM A312, ASME SA312, ASTM A358, ASTM A778, ASME B36.19M, and other internationally recognized specifications.
Stainless Steel 347H Welded Pipes are available from 1/8" NB to 24" NB with multiple wall thicknesses, schedules, and custom lengths to suit project requirements.
They are widely used in power plants, refineries, petrochemical facilities, fertilizer plants, boilers, pressure vessels, heat exchangers, and chemical processing industries.
Yes. SS 347H offers excellent oxidation resistance, creep strength, and structural stability, making it suitable for continuous operation at elevated temperatures.
Each pipe undergoes hydrostatic testing, PMI, radiographic testing, eddy current testing, dimensional inspection, and visual examination before delivery.
Yes. All Stainless Steel 347H Welded Pipes are supplied with EN 10204 3.1 Mill Test Certificates. Third-party inspection certificates are also available upon request.
Yes. We manufacture customized welded pipes in different diameters, wall thicknesses, lengths, schedules, end preparations, and surface finishes according to customer specifications.
Kamal Steels is a trusted manufacturer and stockist of Stainless Steel 347H Welded Pipes, offering certified materials, strict quality control, competitive pricing, ready stock, timely delivery, and reliable support for industrial projects worldwide.