ASTM A213 T91 Seamless Alloy Tube
ASTM A213 T91 seamless alloy steel tube for boiler, superheater, and heat-exchanger service at elevated temperatures. Widely used in oil & gas, power generation, fertilizer, chemical, and process industries where high creep strength and long-term thermal stability are required.
Standard & Grade
- Standard: ASTM A213 / ASME SA213
- Grade: T91
- Product type: Seamless ferritic alloy steel tube
Applications
- Oil & gas processing
- Power generation plants
- Boilers and superheaters
- Heat exchangers
- Fertilizer and chemical plants
- Paper & pulp, pharmaceuticals, water treatment, and other process industries
Manufacturing
- Manufactured by the seamless process
- Supplied hot finished or cold finished, as specified
Heat Treatment
- Heat treatment performed separately in addition to hot forming
- Ferritic alloy steels reheated in accordance with ASTM A213
- Austenitic stainless tubes (where applicable in scope) supplied heat treated
- Alternative rapid cooling or quenching permitted after hot forming, as specified
Testing & Inspection
- Tension test
- Hardness test
- Flattening test
- Flaring test
- Each tube subjected to non-destructive electric testing or hydrostatic testing
Dimensional Scope (ASTM A213)
- Inside diameter: from 1/8 in. (3.2 mm)
- Outside diameter: up to 5 in. (127 mm)
- Wall thickness: 0.015 – 0.500 in. (0.4 – 12.7 mm)
- Other sizes available on request
Related Standards (Context)
- ASTM A209: Carbon-molybdenum alloy boiler and superheater tubes
- ASTM A210: Medium-carbon steel boiler and superheater tubes
- ASTM A213: Ferritic and austenitic alloy steel boiler, superheater, and heat-exchanger tubes
