Stainless Steel 347 Seamless Pipes

Stainless Steel 347 Seamless Pipe is manufactured from niobium-stabilized austenitic stainless steel that provides excellent resistance to intergranular corrosion after exposure to elevated temperatures. The seamless construction eliminates longitudinal welds, offering superior pressure handling capability, excellent mechanical strength and reliable performance in high-temperature industrial applications.

Kamal Steels supplies Stainless Steel 347 Seamless Pipes in a wide range of sizes, wall thicknesses, schedules and custom lengths to meet diverse project requirements. ASTM A312 TP347 Seamless Pipe is widely used in heat exchangers, pressure vessels, petrochemical plants, power generation, refineries, aerospace and chemical processing industries where oxidation resistance, weldability and elevated temperature strength are essential.

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Actual pipe dimensions, tolerances, and outside diameters are determined according to ASTM, ASME, and ANSI dimensional standards. The appropriate size should be selected based on pressure rating, flow capacity, and process requirements.

The weight of SS 347 Seamless Pipes varies according to the outside diameter, wall thickness, schedule, and overall pipe length. Higher schedules provide greater wall thickness and improved pressure-handling capability, resulting in increased weight per metre.

The values shown above are approximate theoretical weights. Actual pipe weights may vary depending on manufacturing tolerances, dimensional standards and production processes.

Stainless Steel 347 Seamless Pipes are manufactured in a wide range of pipe schedules to suit varying operating pressures and temperatures. Selecting the correct schedule is essential for ensuring the required strength, wall thickness, and long-term performance in industrial piping systems. The schedule should always be selected according to design pressure, service temperature, and applicable piping standards.

Actual wall thickness varies according to the nominal pipe size and dimensional standards such as ASME B36.19M. Kamal Steels supplies SS 347 seamless pipes in multiple schedules to meet project-specific requirements.

ASTM A312 TP347 Seamless Pipe is a niobium (columbium) stabilized austenitic stainless steel pipe designed for high-temperature service and excellent resistance to intergranular corrosion. The addition of niobium minimizes chromium carbide precipitation during welding, allowing the material to maintain superior corrosion resistance without requiring post-weld heat treatment in many applications.

ASTM A312 TP347 seamless pipes are widely used in refineries, petrochemical plants, power generation facilities, heat exchangers, pressure vessels, boilers, chemical processing units, thermal processing equipment, and other applications involving continuous exposure to elevated temperatures. The material provides excellent oxidation resistance, good mechanical strength, outstanding weldability, and long service life under demanding operating conditions.

Kamal Steels supplies ASTM A312 TP347 Seamless Pipes in various sizes, wall thicknesses, schedules, surface finishes, and custom lengths with complete Material Test Certificates (MTC), third-party inspection, and export-quality packaging to meet domestic and international project requirements.

Chemical Composition of SS 347 Seamless Pipe

Mechanical Properties of SS 347 Seamless Pipe

The chemical composition and mechanical properties of SS 347 Seamless Pipes conform to ASTM A312 and related international specifications. Every pipe supplied by Kamal Steels can be accompanied by an EN 10204 3.1 Material Test Certificate (MTC) to verify compliance with the required standards and project specifications.

SS 347 and SS 321 are stabilized austenitic stainless steel grades specifically developed for elevated-temperature service and resistance to intergranular corrosion after welding. The primary difference lies in their stabilizing elements. SS 347 contains niobium (columbium), while SS 321 contains titanium. SS 347 generally offers improved creep resistance and superior performance during prolonged exposure to high temperatures, making it a preferred material for pressure vessels, boilers, and refinery equipment. SS 321 is widely selected for heat exchangers, exhaust systems, and general high-temperature process piping.

Stainless Steel 347 pipes are available in both seamless and welded construction. Seamless pipes are manufactured from solid billets without a longitudinal weld seam, providing excellent strength for high-pressure and high-temperature applications. Welded pipes are produced by forming stainless steel plate or strip and welding the joint, making them a cost-effective solution for general industrial applications where design specifications permit.

The selection between seamless and welded SS 347 pipes depends on the operating pressure, service temperature, corrosion environment, project specifications, and applicable piping standards. Kamal Steels supplies both seamless and welded stainless steel pipes in accordance with ASTM and ASME standards.

Stainless Steel 347 Seamless Pipes are extensively used in industries requiring excellent oxidation resistance, superior high-temperature strength, and long-term reliability under demanding operating conditions. Their resistance to intergranular corrosion makes them ideal for welded structures and elevated-temperature process systems.