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Girgaon, Mumbai - 400004
Stainless Steel 347H Welded Pipes Manufacturer in India
What are Stainless Steel 347H Welded Pipe?
Stainless Steel 347H Welded Pipe is a high-carbon, stabilized austenitic stainless steel pipe manufactured by forming stainless steel strip, sheet or plate into a tubular shape and joining the edges by welding. Grade 347H contains columbium (niobium) as a stabilizing element, while its higher carbon content provides improved strength for elevated-temperature service. The stabilization helps reduce chromium-carbide precipitation during prolonged exposure to high temperatures.
Stainless Steel 347H Welded Pipes offer good corrosion resistance, oxidation resistance and elevated-temperature strength. They are commonly selected for high-temperature process piping, heat exchangers, furnace equipment, refinery systems, chemical processing equipment and other industrial applications where reliable performance is required under prolonged elevated-temperature conditions.
Kamal Steels is a Stainless Steel 347H 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 347H Welded Pipe Specifications
- Stainless Steel 347H Welded Pipe Weight Chart
- Stainless Steel 347H Welded Pipe Size Range
- ASTM A312 TP347H Welded Pipe
- Stainless Steel 347H vs 347 Welded Pipe
- Stainless Steel 347H Welded Pipe Chemical Composition
- Mechanical Properties of Stainless Steel 347H Welded Pipe
- Features of Stainless Steel 347H Welded Pipes
- Stainless Steel 347H Welded Pipe Applications
- Industries Using Stainless Steel 347H Welded Pipe
- Frequently Asked Questions
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 |
Stainless Steel 347H Welded Pipe Weight Chart
The weight of Stainless Steel 347H Welded Pipes depends on the outside diameter, wall thickness and pipe length. The following weight chart provides approximate theoretical weights for commonly used pipe sizes. Actual 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 |
ASTM A312 TP347H Welded Pipe
ASTM A312 TP347H Welded Pipe is manufactured from Stainless Steel 347H for high-temperature and general corrosive service. Grade TP347H is a stabilized austenitic stainless steel with columbium (niobium) added to improve resistance to chromium-carbide precipitation during elevated-temperature exposure. The higher carbon content of 347H provides higher strength than the standard 347 grade at elevated temperatures.
ASTM A312 TP347H Welded Pipes are available in different nominal sizes, wall thicknesses and schedules to meet industrial piping requirements. They are commonly supplied for process piping, heat exchangers, refinery equipment, furnace systems and other applications where elevated-temperature strength and corrosion resistance are required.
| Parameter | ASTM A312 TP347H Welded Pipe |
|---|---|
| Material Grade | Stainless Steel 347H |
| UNS Number | S34709 |
| Product Form | Welded Pipe |
| Material Type | Austenitic Stainless Steel |
| Specification | ASTM A312 / ASME SA312 |
| Stabilizing Element | Columbium (Niobium) |
| Carbon Content | Higher than Grade 347 |
| Service | High-Temperature and Corrosive Service |
| Certification | Material Test Certificate available as required |
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.
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 |
Features of Stainless Steel 347H Welded Pipes
Stainless Steel 347H Welded Pipe Applications
| Application | Typical Use |
|---|---|
| High-Temperature Process Piping | Process and fluid-transfer piping exposed to prolonged elevated temperatures |
| Heat Exchangers | High-temperature heat-transfer equipment and process connections |
| Furnace Systems | High-temperature piping and furnace equipment components |
| Boiler & Superheater Systems | Selected high-temperature steam and process piping applications |
| Exhaust Systems | High-temperature exhaust piping and fabricated components |
| Refinery Process Piping | Process lines and equipment operating at elevated temperatures |
| Chemical Process Equipment | Corrosive and high-temperature process piping systems |
| Thermal Processing Equipment | Piping and components used in heat-treatment and thermal processing |
Industries Using Stainless Steel 347H Welded Pipe
| Industry | Typical Applications |
|---|---|
| Oil & Gas | High-temperature process piping and refinery systems |
| Petrochemical | Process lines, heat-transfer systems and plant piping |
| Chemical Processing | High-temperature and corrosive-service process systems |
| Power Generation | Boiler, superheater and high-temperature utility systems |
| Refineries | Furnace systems, process piping and thermal equipment |
| Heat Exchanger Manufacturing | High-temperature heat-transfer equipment and piping connections |
| Fertilizer Industry | Process piping and elevated-temperature equipment systems |
| Aerospace | Selected high-temperature exhaust and fabricated components |
| Industrial Equipment Manufacturing | Thermal processing equipment and high-temperature fabricated systems |
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.