Standards :
ASTM A312 TP347 Pipes, ASTM A213 TP347 Tubes
Standards :
ASTM A312 TP347 Pipes, ASTM A213 TP347 Tubes
Equivalent Grade :
UNS S34700 Pipe
Variants :
SS 347H Pipes and Tubes (higher carbon for enhanced creep strength)
Forms :
SS 347H Boiler Tubes, SS 347 Instrumentation Tubes and SS 347 High-Temperature Pipes
Industrial process facilities operating under elevated temperatures require piping materials capable of maintaining corrosion resistance and mechanical integrity over prolonged service. As a trusted SS 347 Pipes and Tubes Supplier, KVN Steels manufactures premium-quality stainless steel piping solutions engineered for demanding applications where oxidation resistance, weldability, and long-term structural stability are essential. Our products comply with internationally recognised ASTM and ASME specifications and support industrial projects across Dubai, Abu Dhabi, Sharjah, Ajman, Fujairah, Ras Al Khaimah, Al Ain, and throughout the UAE.
Engineered for High-Temperature Industrial Service
SS 347 is a titanium-free, niobium-stabilised austenitic stainless steel specifically developed to minimise chromium carbide precipitation during welding and prolonged exposure to elevated temperatures. This stabilised composition provides superior resistance to intergranular corrosion while preserving excellent mechanical properties in thermal processing environments.
As an established Stainless Steel 347 Pipe Supplier, KVN Steels manufactures seamless and welded pipes that deliver dependable performance in refinery units, pressure piping systems, heat exchangers, superheaters, and chemical processing facilities operating under demanding service conditions.
Comprehensive Portfolio of SS 347 Pipes and Tubes
Our product portfolio encompasses precision-engineered piping solutions manufactured to internationally recognised standards, accommodating a broad spectrum of industrial specifications and critical process requirements.
Manufactured in multiple schedules, wall thicknesses, diameters, and custom lengths, our products are available for both standard and project-specific engineering requirements.
International Manufacturing Standards
Every product is manufactured under stringent quality management systems and complies with internationally accepted specifications, including:
Comprehensive quality assurance includes Positive Material Identification (PMI), Hydrostatic Testing, Eddy Current Testing, Ultrasonic Testing (UT), Dimensional Verification, Chemical Analysis, Mechanical Property Evaluation, and complete material traceability before dispatch.
Why Industries Choose KVN Steels
Selecting a reliable SS 347H Pipes and Tubes Supplier requires confidence in manufacturing capability, certified raw materials, and consistent product quality. KVN Steels supports EPC contractors, fabrication companies, refinery operators, OEMs, and industrial engineering firms by supplying piping products that meet stringent technical specifications.
Our advantages include:
Applications Across Critical Industries
Our High Temperature SS 347 Pipes are extensively specified for industries requiring exceptional resistance to thermal cycling and elevated operating temperatures.
Typical applications include:
Their outstanding creep resistance, oxidation resistance, and excellent weldability make them particularly suitable for continuous high-temperature service.
Why SS 347 is Preferred for Elevated-Temperature Service
The incorporation of niobium stabilises the austenitic stainless steel microstructure by inhibiting chromium carbide precipitation during welding and prolonged exposure to elevated temperatures, thereby preserving corrosion resistance and long-term structural integrity. This significantly improves resistance to intergranular corrosion while maintaining excellent mechanical strength, oxidation resistance, and fabrication characteristics. Compared with conventional austenitic stainless steels, SS 347 provides enhanced long-term reliability in elevated-temperature industrial environments where structural stability is critical.
Your Trusted SS 347 Pipes and Tubes Supplier
Whether your project requires ASTM A312 TP347 Seamless Pipes, a dependable 347 Stainless Steel Tubes Supplier, an experienced SS 347 Seamless Pipe Exporter, or a trusted SS 347 Pipe Supplier in UAE, KVN Steels delivers precision-engineered piping solutions supported by international quality standards, technical expertise, and dependable logistics. Our commitment to engineering excellence has established us as a preferred supplier of ASME SA312 TP347 Pipes and Tubes for mission-critical industrial projects across the UAE.
| STANDARD | UNS | WNR. | EN | JIS | GOST |
|---|---|---|---|---|---|
| SS 347 | S34700 | 1.4550 | X6CrNiNb18-10 | SUS 347 | 08Ch18N12B |
| SS 347H | S34709 | 1.4961 | X6CrNiNb18-12 | SUS 347H | - |
SS 347/347H Seamless Pipes
Designed for high-temperature and pressure applications requiring excellent corrosion and oxidation resistance.
SS 347 ERW Pipes
Manufactured for industrial piping systems demanding dimensional accuracy and reliable mechanical performance.
SS 347 Round Pipes
Suitable for structural, process, and fluid transfer applications requiring durable stainless steel construction.
SS 347 Welded Pipes
Engineered for thermal and chemical processing systems exposed to elevated operating temperatures.
SS 347 EFW Pipes
Produced for large-diameter industrial applications requiring strong weld integrity and heat resistance.
SS 347/347H ERW Pipes & Tubes
SS 347/347H ERW Pipes & Tubes are precision-welded stainless steel solutions offering uniform thickness, reliable strength, and excellent performance in high-temperature and industrial applications.
Standards :
ASTM A312 TP347 Pipes, ASTM A213 TP347 Tubes
Equivalent Grade :
UNS S34700 Pipe
Variants :
SS 347H Pipes and Tubes (higher carbon for enhanced creep strength)
Forms :
SS 347H Boiler Tubes, SS 347 Instrumentation Tubes and SS 347 High-Temperature Pipes
Thickness Range :
Available from ultra-thin 0.3 mm up to heavy-duty 50 mm thickness, including standard schedules such as SCH 5, SCH 10, SCH 40, SCH 80, SCH 80S, SCH 160, XS, XXS and custom requirements.
Manufacturing Types :
Offered in multiple production formats including seamless, ERW (Electric Resistance Welded), welded, and custom-fabricated pipes to suit diverse industrial applications.
Available Shapes & Forms :
Supplied in a wide variety of profiles such as round, square, rectangular, oval, and hydraulic configurations, ensuring compatibility with structural and process requirements.
Length Options :
Delivered in standard single random and double random lengths, as well as fully customized cut-to-length solutions based on project specifications.
End Finishes :
Options include plain end, beveled end, and threaded ends, designed for easy installation and secure connections.
End Protection :
Each pipe is equipped with protective plastic caps to prevent damage during handling and transportation.
Surface Finishes :
Available in multiple finishes including 2B, No.1, No.4, and mirror polish (No.8), along with customized surface treatments as per client requirements.
Delivery Condition :
Supplied in various metallurgical conditions such as annealed & pickled, bright annealed, polished, and cold drawn, ensuring optimal performance across applications.
Inspection & Testing :
All materials undergo rigorous quality checks supported by comprehensive documentation, including: Mill Test Certificates (MTC) as per EN 10204 3.1 and Chemical and mechanical test reports.
Packaging Standards :
Securely packed using wooden crates, plastic wrapping, or steel-strapped bundles to ensure safe transit. Custom packaging solutions are also available based on client needs.
Custom Manufacturing :
Non-standard sizes, grades, and specifications can be developed and supplied on request, tailored to meet specific project or industry demands.
Chemical Composition of Stainless Steel 347/347H Seamless Pipes And Tubes
| Element | C | Cr | Mn | Ni | P | S | Si | Cb/Ta |
|---|---|---|---|---|---|---|---|---|
| 347 | 0.08 max | min: 17.0 max: 20.0 |
2.0 max | min: 9.0 max: 13.0 |
0.04 max | 0.30 max |
0.75 max |
min:10x C max: 1.0 |
| 347H | min: 0.04 max: 0.10 |
min: 17.0 max: 20.0 |
2.0 max | min: 9.0 max: 13.0 |
0.03 max | 0.30 max |
0.75 max |
min:10x C max: 1.0 |
Mechanical Properties Of Stainless Steel 347/347H Seamless Pipes and Tubes
|
Grade |
Tensile Strength ksi (MPa) min |
Yield Strength 0.2% ksi offset ksi (MPa) min |
Elongation (% in 50mm) min |
Hardness (Brinell) MAX |
|
347/347H |
75 |
30 |
40 |
201 |
Physical Properties of 347/347H Stainless Steel Pipes And Tubes
| Density lbm/in3 |
Coefficient of Thermal Expansion (min/in)-°F |
Thermal Conductivity BTU/hr-ft-°F | Specific Heat BTU/lbm -°F | Modules of Elasticity (annealed)2-psi | |
|---|---|---|---|---|---|
| at 68 °F | at 68 – 212°F | at 68 – 1832°F | 68-932°F | at 32 – 212°F | in tension (E) |
| 0.288 | 9.2 | 11.4 | 14.7 | 0.12 | 28 x 106 |
Our SS 347 Pipes and Tubes Supplier are used in a wide range of applications and various industries. Below are a few of them:
Application Industries
Aerospace Industry
Food Processing Industry
Pulp & Paper Indusry
Energy Industry
Pharmaceuticals Industry
Power Plant Industry
Chemical Industry
Oil and Gas Industry
Get clear answers to common queries about our steel products, services, and delivery processes.
SS 347 Pipes and Tubes are stabilised with niobium (columbium), which prevents chromium carbide precipitation during welding and prolonged exposure to elevated temperatures. This metallurgical stability enhances resistance to intergranular corrosion, oxidation, and creep, making the alloy particularly suitable for high-temperature process piping in refineries, power generation facilities, and petrochemical plants.
Both grades are niobium-stabilised austenitic stainless steels; however, SS 347H contains a higher carbon content, providing improved creep strength and mechanical performance at elevated temperatures. SS 347 is generally selected for corrosion-resistant process piping, whereas SS 347H is preferred for applications involving prolonged service under high thermal stress.
SS 347 Pipes and Tubes are extensively specified across industries operating under sustained thermal and mechanical loading, including petroleum refining, petrochemical processing, power generation, chemical manufacturing, fertilizer production, pressure vessel fabrication, heat exchanger assemblies, and industrial process piping. Their niobium-stabilised microstructure ensures excellent resistance to intergranular corrosion, oxidation, and thermal fatigue, making them a preferred material for critical high-temperature engineering applications.
SS 347 Pipes and Tubes are commonly manufactured in accordance with ASTM A312, ASTM A213, ASTM A269, ASTM A358, ASME SA312, and ASME SA213 specifications. Compliance with these internationally recognised standards ensures dimensional accuracy, mechanical reliability, pressure integrity, and consistent material quality for industrial applications.
To ensure compliance with internationally recognised engineering and quality standards, SS 347 Pipes and Tubes undergo a comprehensive quality assurance programme comprising Positive Material Identification (PMI), Hydrostatic Pressure Testing, Ultrasonic Testing (UT), Eddy Current Testing (ECT), Dimensional Verification, Chemical and Mechanical Property Evaluation, Surface Inspection, and complete material traceability prior to final dispatch.
Our Location
Flat no 5, Swapna HSG Soc
Ltd., Charkop, Kandivali West,
Mumbai, Maharashtra, India.
400067
