ASTM A213 TP321 is a seamless austenitic stainless steel tube specifically engineered for high-temperature and corrosive service environments. The grade is stabilized with titanium, which provides exceptional resistance to intergranular corrosion and makes it suitable for a wide range of demanding industrial applications, from boilers to chemical processing equipment.

This product is manufactured in strict compliance with the latest international standards:

• Primary Standard: ASTM A213/A213M - Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes.
• Related Standard: ASTM A312/A312M for seamless austenitic stainless steel pipes.
• Key Designation: The "TP" stands for "Tube, Pipe." The "H" variant (TP321H) has a higher carbon content for improved creep-rupture strength at elevated temperatures.
• Common Size Range: While custom sizes are available, typical tubing supplied to this specification has an outside diameter ranging from 3.2 mm (1/8 in) to 127 mm (5 in) with wall thicknesses from 0.4 mm to 12.7 mm.

TP321 is a titanium-stabilized derivative of the classic 18-8 (Cr-Ni) stainless steel. The addition of titanium (at least 5 times the carbon content) prevents chromium carbide precipitation at grain boundaries during high-temperature exposure, thereby maintaining its corrosion resistance.

A typical chemical composition is shown in the table below:

ASTM A213 TP321 tubes are required to undergo mechanical testing, including tension and flattening tests, and are supplied in a heat-treated condition. The following table outlines its key mechanical properties at room temperature.

Due to its stability and strength under heat, TP321 seamless tubes are critical components in several heavy industries:

• Heat Exchangers & Boilers: Widely used in boiler superheater and reheater tubes, heat exchangers, and condenser tubes.
• Petrochemical Industry: Ideal for refinery piping, furnace components, and equipment handling corrosive chemicals.
• Power Generation: Suitable for high-temperature steam and feedwater lines in fossil fuel power plants.
• Automotive & Aerospace: Used in engine exhaust systems and other high-temperature assemblies.