Stainless Steel 347 Seamless Pipes Manufacturer in India

Stainless Steel 347 Seamless Pipes Manufacturer in India

Kamal Steels is a trusted Manufacturer and Stockist of Stainless Steel 347 Seamless Pipes, offering premium-quality seamless pipes manufactured in accordance with ASTM A312 and ASME SA312 standards. Produced from Stainless Steel 347 (UNS S34700 / WNR 1.4550), our seamless pipes are engineered for applications requiring excellent corrosion resistance, high-temperature strength and dependable performance under prolonged thermal exposure. The addition of niobium (columbium) stabilizes the alloy against carbide precipitation, providing enhanced resistance to intergranular corrosion and making SS 347 an excellent choice for welded components and elevated temperature service.

Available in a comprehensive range of sizes, schedules, wall thicknesses and custom lengths, our Stainless Steel 347 Seamless Pipes are widely used in chemical processing plants, petrochemical facilities, refineries, heat exchangers, boilers, pressure vessels, power generation units, aerospace components and high-temperature process piping systems. Every pipe is manufactured using certified raw materials, undergoes stringent quality inspections and is supplied with complete inspection documentation to ensure dimensional accuracy, long service life, and compliance with international quality standards.

With extensive ready stock, project-specific manufacturing capabilities and timely delivery, Kamal Steels supports customers across India and international markets with Stainless Steel 347 Seamless Pipes designed to deliver reliable performance in demanding industrial applications where corrosion resistance, weld stability and elevated temperature service are essential.

• What are Stainless Steel 347 Seamless Pipes?
• Why Stainless Steel 347 Stands Apart
• Applications of SS 347 Seamless Pipes
• SS 347 Seamless Pipe Specifications
• Equivalent Grades
• Chemical Composition
• Mechanical Properties
• Why Choose Kamal Steels?
• FAQs

A Stainless Steel 347 Seamless Pipe is a niobium (columbium) stabilized austenitic stainless steel pipe manufactured from a solid billet without any welded joint. The seamless manufacturing process provides a uniform grain structure, excellent mechanical strength, and reliable performance under high pressure and elevated temperatures.

The addition of niobium helps stabilize the stainless steel by preventing chromium carbide precipitation during welding and prolonged exposure to heat. This gives SS 347 Seamless Pipes excellent resistance to intergranular corrosion, oxidation and thermal fatigue, making them suitable for applications where conventional stainless steel grades may become sensitized.

Manufactured in accordance with ASTM A312, ASTM A358, ASME SA312, and other international standards, Stainless Steel 347 Seamless Pipes are available in various sizes, schedules, wall thicknesses, and surface finishes. They are widely used in refineries, petrochemical plants, power generation facilities, chemical processing industries, heat exchangers, boilers, aerospace components and marine applications where long-term reliability is essential.

Stainless Steel 347 belongs to the austenitic stainless steel family but offers an important advantage over conventional grades such as SS 304. It is stabilized with niobium (columbium) and tantalum, which help prevent chromium carbide precipitation during welding and prolonged exposure to elevated temperatures. This stabilization significantly improves resistance to intergranular corrosion while maintaining excellent strength and oxidation resistance.

Because of these properties, SS 347 Seamless Pipes are widely used in applications operating between 800°F and 1500°F (427°C to 816°C), where ordinary stainless steel grades may lose performance. The material also offers excellent weldability, good formability and long service life in demanding industrial environments.

Compared to SS 304, Grade 347 provides superior high-temperature stability and better resistance to sensitization after welding. When compared with SS 321, which uses titanium as the stabilizing element, SS 347 uses niobium to achieve similar protection against intergranular corrosion and is often preferred for applications involving extensive welding and continuous high-temperature service.

These characteristics make Stainless Steel 347 Seamless Pipes an excellent choice for refineries, petrochemical plants, power stations, heat exchangers, pressure vessels, aerospace components and chemical processing equipment where reliability under thermal stress is essential.

Stainless Steel 347 Seamless Pipes are widely used in industries where high-temperature strength, oxidation resistance, and protection against intergranular corrosion are essential. Their seamless construction, combined with niobium stabilization, makes them suitable for critical process piping systems operating under demanding thermal and pressure conditions.

Thanks to their excellent mechanical strength and high-temperature corrosion resistance, Stainless Steel 347 Seamless Pipes are the preferred choice for applications requiring long service life, reliable weldability and dependable performance in aggressive industrial environments.

Kamal Steels manufactures and supplies Stainless Steel 347 Seamless Pipes in accordance with ASTM, ASME, and international standards. Our pipes are available in a wide range of sizes, schedules, lengths, and surface finishes to meet the requirements of high-temperature and corrosion-resistant industrial applications.

Stainless Steel 347 Seamless Pipes are manufactured in accordance with internationally recognized material standards, ensuring compatibility across global engineering projects. Grade 347 is identified by UNS S34700 and Werkstoff No. 1.4550, making it suitable for applications that require excellent oxidation resistance, weldability and long-term performance at elevated temperatures.

The chemical composition of Stainless Steel 347 Seamless Pipes is carefully controlled to ensure excellent corrosion resistance, high-temperature strength, and long-term structural stability. The key element in Grade 347 is niobium (columbium), which stabilizes the alloy and prevents carbide precipitation during welding and heat exposure.

Stainless Steel 347 Seamless Pipes offer strong mechanical performance along with excellent stability at elevated temperatures. The addition of niobium improves creep resistance and helps maintain strength even under long-term thermal exposure, making it suitable for demanding industrial environments.

Stainless Steel 347 Seamless Pipes are widely used in industries where high temperature strength, corrosion resistance and long-term stability are critical. Thanks to their niobium-stabilized composition, these pipes perform reliably in environments involving continuous heat exposure and cyclic thermal stress.

• Aerospace Industry: Exhaust systems, jet engine components and high-temperature assemblies
• Oil & Gas Industry: Refinery piping systems, heat exchangers and process equipment
• Power Generation: Boiler tubes, superheaters and steam pipelines
• Chemical Processing: Reactors, pressure vessels and corrosive fluid handling systems
• Marine Industry: Equipment exposed to saltwater and corrosive marine environments
• Industrial Equipment: High-temperature fabrication and thermal processing systems