Stainless Steel 347H Seamless Pipes

Stainless Steel 347H Seamless Pipe is manufactured from a high-carbon, niobium-stabilized austenitic stainless steel developed for elevated temperature service. Its seamless construction provides a uniform pipe structure without a longitudinal weld, offering excellent creep strength, oxidation resistance and dependable mechanical performance under high-pressure and high-temperature operating conditions.

Kamal Steels supplies Stainless Steel 347H Seamless Pipes in a wide range of sizes, schedules, wall thicknesses and custom lengths to satisfy industrial project requirements. ASTM A312 TP347H Seamless Pipe is widely used in boilers, superheaters, heat exchangers, refineries, petrochemical plants, power generation facilities and other high-temperature process piping systems where long-term thermal stability and corrosion resistance are essential.

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Stainless Steel 347H Seamless Pipes are available in standard nominal pipe sizes with dimensions manufactured according to ASTM, ASME and ANSI specifications. The appropriate pipe size should be selected based on the required flow rate, operating pressure, and process design conditions.

The weight of SS 347H Seamless Pipes depends on the nominal pipe size, outside diameter, wall thickness, schedule, and pipe length. Pipes with thicker walls provide greater pressure resistance but also have higher theoretical weight per metre.

The weights listed above are approximate theoretical values. Actual weights may vary depending on manufacturing tolerances, dimensional standards, and production methods specified by ASTM A312 and related international standards.

Stainless Steel 347H Seamless Pipes are manufactured in a variety of schedules to satisfy different pressure and temperature requirements. Selecting the appropriate schedule depends on operating pressure, temperature, corrosion allowance, and applicable piping standards such as ASTM A312 and ASME B36.19M.

ASTM A312 TP347H Seamless Pipe is a high-carbon niobium-stabilized austenitic stainless steel pipe designed for elevated-temperature service. The higher carbon content of TP347H improves creep strength and stress rupture resistance, making it suitable for prolonged operation at high temperatures while maintaining excellent oxidation and corrosion resistance.

ASTM A312 TP347H seamless pipes are widely used in power generation, petrochemical plants, refineries, heat exchangers, pressure vessels, superheaters, boilers, steam pipelines, and chemical processing industries. The seamless manufacturing process provides uniform strength, enhanced reliability, and excellent resistance to internal pressure in critical applications.

Kamal Steels supplies ASTM A312 TP347H Seamless Pipes in a comprehensive range of sizes, schedules, lengths, wall thicknesses, and finishes. Every pipe is manufactured to international quality standards and is available with EN 10204 3.1 Material Test Certificates and optional third-party inspection for domestic and export projects.

Chemical Composition of SS 347H Seamless Pipe

Mechanical Properties of SS 347H Seamless Pipe

SS 347H Seamless Pipes combine excellent high-temperature strength, oxidation resistance, and corrosion resistance with good weldability and toughness. Their stabilized composition minimizes chromium carbide precipitation during welding, making them suitable for continuous service in elevated-temperature environments found in refineries, boilers, power plants and petrochemical industries.

SS 347H and SS 347 are both niobium-stabilized austenitic stainless steel grades offering excellent resistance to intergranular corrosion and oxidation. The primary difference is the higher carbon content in SS 347H, which provides improved creep strength and stress rupture resistance, making it the preferred choice for prolonged high-temperature service. SS 347 is generally selected for applications requiring good corrosion resistance under moderate operating temperatures.

The major difference between SS 347H seamless pipes and welded pipes is the manufacturing process. Seamless pipes are produced from solid billets without any welded joint, providing superior strength and reliability for high-pressure and elevated-temperature applications. Welded pipes are manufactured by forming stainless steel plates or coils into a tubular shape and joining the edges through welding, making them a cost-effective solution for many industrial services.

The selection between seamless and welded pipes depends on project requirements, operating pressure, service temperature, corrosion conditions, budget, and applicable industry standards. Seamless pipes are generally preferred for critical services where higher strength and reliability are essential.

Stainless Steel 347H Seamless Pipes are extensively used in industries operating under high temperatures and pressure conditions. Their excellent creep strength, oxidation resistance, and corrosion resistance make them suitable for critical industrial piping systems and thermal processing equipment.