What is T91 seamless steel pipe

T91 seamless steel pipe is usually used as boiler, superheater and heat exchanger pipe with minimum wall thickness.

T91 seamless steel pipe standard: ASTM A213 - American Society for testing and materials.

Chemical composition of T91 seamless steel pipe: C 0.07-0.14, Mn 0.30-0.60, P ≤ 0.020, S ≤ 0.010, Si 0.20-0.50, Ni ≤ 0.40, Cr 8.0-9.5, Mo 0.85-1.05, V 0.18-0.25, Nb 0.06-0.10, N 0.030-0.070, Al ≤ 0.02, Ti ≤ 0.01, Zr ≤ 0.01.

Mechanical properties of T91 seamless steel pipe: Tensile strength ≥ 585 MPa, yield strength ≥ 415 MPa, elongation ≥ 20%.

Application of T91 seamless steel pipe: it is suitable for seamless iron element and austenitic steel pipe with minimum wall thickness for boiler and superheater and austenitic steel pipe for heat exchanger.