ASTM A213 T9 Alloy Steel Seamless Tube for Boiler Superheater

ASTM A213 T9 is a standard specification for seamless ferritic and austenitic alloy steel boiler, superheater, and heat-exchanger tubes. The T9 grade is a specific chromium-molybdenum alloy steel known for its excellent elevated temperature strength and oxidation resistance.

1. Key Characteristics & Applications

• Primary Use: These tubes are primarily designed for high-temperature service environments, making them ideal for:

  • Power Generation Boilers: Superheater and reheater tubes.

  • Fossil Fuel Plants: Heat exchangers, condenser tubes, and piping systems.

  • Petrochemical Industry: Components in refineries and chemical processing equipment where resistance to corrosion and heat is critical.

• Main Advantages:

  • Good Elevated Temperature Strength: Maintains structural integrity and resists creep (deformation under long-term stress at high temperatures).

  • Oxidation Resistance: The chromium content provides a protective oxide layer, preventing scaling and degradation in oxidizing atmospheres.

  • Weldability and Formability: Can be welded and fabricated using standard procedures suitable for chromium-molybdenum steels.

2. Chemical Composition

3. Mechanical Properties

4. Manufacturing Standard

The tubes are manufactured as seamless (without a weld seam) through a process like extrusion or piercing, ensuring uniformity and strength throughout the tube's circumference. This makes them highly reliable for high-pressure applications.