ASTM A312 TP347H High Temperature Industrial Stainless Steel Seamless Pipe

ASTM A312 TP347H high temperature industrial stainless steel seamless pipe

 

ASTM A312 TP347H pipe is a high-temperature stabilized austenitic stainless steel seamless tube designed for use in environments subject to extreme heat, oxidizing, and intergranular corrosion, such as those found in the power generation and petrochemical industries. It features the addition of niobium (columbium) to prevent chromium carbide precipitation at high temperatures, thereby enhancing its resistance to intergranular corrosion. The "H" designation indicates a higher carbon content, which improves strength, toughness, and creep resistance at high temperatures.

What are the specifications for SS 316 seamless pipe?

 

316 stainless steel pipe has a minimum tensile strength of 515 MPa and a minimum yield strength of 200 MPa. Its density is as high as 8,000 kg/m³. Standard wall thicknesses for these pipes range from 0.5 mm to 6.35 mm. SS 316 seamless pipe does not have fillet welds.

ASTM A312 Stainless Steel Seamless Pipe Chemical Composition

ASTM A312 TP347/TP347H Stainless Steel Seamless Pipe Mechanical Properties

ASTM A312 TP347H seamless stainless steel pipe applications

(1) High-temperature industrial equipment

Boilers and power plants: superheater and reheater pipes, capable of withstanding high-pressure steam (≤ 800°C).

Cracking furnace tubes: radiant section furnace tubes of high-temperature cracking furnaces in the petrochemical industry.

Heat exchangers: used for heat exchange of high-temperature gases or liquids to avoid sensitization corrosion during long-term use.

(2) Chemical and petrochemical industries

Nitric acid production equipment: nitric acid concentration devices, storage tanks and transportation pipelines.

Ammonia synthesis plants: synthesis towers and reactor pipes under high-temperature and high-pressure environments.

(3) Other fields

Food processing: high-temperature sterilization equipment (must meet hygiene standards).

Nuclear industry: auxiliary pipelines of certain nuclear fuel processing systems.

How to Identify "H" Grade Steel
Chemical Composition: "H" grade steel has a higher carbon content (typically 0.04% - 0.10%) than standard 347 grade steel, which is critical for its high-temperature performance.
UNS Number: 347H is designated by the UNS number S34709 to distinguish it from standard 347 grade steel (UNS S34700).

 

About Gnee Steel

Gnee Steel specializes in the production of a wide range of stainless steel products. Gnee Steel's product packaging includes: Steel Strapping: Pipes with an outer diameter of 3 inches or less are typically strapped together with polypropylene film to prevent rust during ocean shipping, and then secured with steel strapping. Wooden Cases/Crates: Pipes are typically packaged in wooden cases or crates to protect the pipes during transportation, especially those that are longer or have larger diameters. Seaworthy Export Packaging: Suppliers typically use standard seaworthy export packaging methods, which may include a variety of materials and techniques to protect the pipes during transportation. Tarpaulin Packaging: This prevents rain, seawater, and other external factors from penetrating the export crates during transportation. Gnee Steel specializes in the production and sale of alloy materials. Gnee Steel's products are widely used in the aerospace, chemical, power, automotive, and nuclear energy sectors, and we can provide customized alloy material solutions based on customer needs. For alloy material pricing or customized alloy material solutions, please contact us for a quote: ru@gneesteelgroup.com