T91 steel is a Ferritic alloy heat resistant steel developed on the basis of T9 steel by fine crystallization, microalloying and controlled rolling and cooling processes. The steel has good mechanical properties, stable structure after high-temperature aging, and good welding and technological properties. Grade T91 specified in ASTM A213 which do Ferrite and Austenitic boiler superheater and heat exchanger seamless steel tube.

  • Standards: ASTM A213
  • Dimension: 1/8” to 24”
  • Wall thickness: SCH10 to 160
  • Length: 1m to 12m or custom Length
  • Application: For superheater, reheater pipe, header and steam pipe under 600℃ in high pressure, ultra-high pressure and subcritical power station, nuclear power heat exchanger and oil cracking unit furnace pipe.

T91 Equivalent Material

T91 X10CrMoVNNb91 STBA 26 10Cr9Mo1VNbN

ASTM A213 T91 Tube Chemistry Composition

Grade C Mn P,≤ S,≤ Si Cr Mo
T91 0.05–0.15 0.30–0.60 0.025 0.025 0.50–1.00 2.65–3.35 0.80–1.06

ASTM A213 T91 Tube Mechanical Properties

Material Yield   strength

ReH/Rp0,2   N/mm² min

Tensile   strength

Rm   N/mm²

Elongation   A

%   min

T91 220Mpa 415Mpa 30

ASTM A213 covers seamless ferritic and austenitic steel boiler, superheater, and heat-exchanger tubes. WLD steel supplies alloy steel ASTM A213 T91 seamless steel tubes manufactured in hot finished or cold finished in various sizes and specifications and equivalent material for boiler and economizer, heater, superheater and reheater system. If you are looking for this material, please contact us or get a quotation. Not only do we have all kinds of sizes, but we also have all kinds of sizes that are hard to find.