What Are ASTM A213 T9 Alloy Steel Seamless Tubes?

ASTM A213 T9 Alloy Steel Seamless Tubes are specialised chromium-molybdenum (often referred to as Chrome-Moly T9 Tube) ferritic alloy steel tubes. Identified by the UNS designation K90941, these tubes are specifically designed for critical high-temperature service. Their composition, primarily featuring 9% chromium and 1% molybdenum, provides excellent resistance to heat, oxidation, and corrosion at elevated temperatures, making them indispensable for applications such as boilers, superheaters, and heat exchangers.

The ASTM A213 specification is the industry standard governing seamless ferritic and austenitic alloy-steel boiler, superheater, and heat-exchanger tubes. Grade T9 within this standard signifies a specific ferritic alloy composition. These tubes are also frequently specified under the equivalent ASME standard, ASME SA 213 T9. The “seamless” nature of these tubes, achieved through processes like hot rolling or cold drawing, ensures a homogenous structure without weld seams, offering superior strength and integrity under high-pressure conditions.

ASTM A213 T9 Alloy Steel Seamless Tubes Specification

Types & Forms of ASTM A213 T9 Tubes Available

We supply ASTM A213 T9 Alloy Steel Seamless Tubes in various forms to suit diverse application requirements:

• Form: Primarily Seamless (manufactured to ensure integrity without weld seams).
• Types:
  • Round Tubes: The most common form for a wide array of applications.
  • U-Tubes: Specifically manufactured for ASTM A213 T9 heat exchange tube bundles, facilitating efficient thermal transfer.
  • Coiled Tubes: Available for specific applications requiring continuous lengths (please inquire).
• Ends:
  • Plain Ends (PE): Cleanly cut ends.
  • Bevelled Ends (BE): Prepared for butt-welding.
• Surface Finish: Typically supplied in annealed and pickled condition, with other finishes available by request.