P91

(UNS K90901)

AVAILABILITY:

Seamless Pipe: 1/2”-24” STD | sch40 | XS | sch80 | XXS | sch160 | ASTM / ASME A/SA-335-P91
Butt-Weld Fittings: 1/2”-24” STD | sch40 | XS | sch80 | XXS | sch160 | ASTM / ASME A/SA-234-WP91
Flanges: 1/2”-24” |  150# | 300# | 600# | 900# | 1500# | ASTM / ASME A/SA-182-F91
Pressure Fittings: 1/4”-4” 3000# | 6000# | ASTM / ASME A/SA-182-F91
Plate: 1/4”-2 1/2” Thick | ASTM / ASME A/SA-387
Bar: 1/2"-6" | ASTM / ASME A/SA-182-F91

DESCRIPTION:

Grade T/P91 is a ferritic-martensitic (9 % chromium, 1 % molybdenum) steel micro-alloyed with vanadium and niobium, and has a controlled nitrogen content according to ASTM A 335, A 213 or to EN 10216-2 standard under the designation X10CrMoVNb9-1. Grade T/P91 exhibits excellent elevated-temperature strength and creep behavior up to 580 °C - 600 °C. Its 9 % chromium content offers better corrosion and oxidation resistance than grade 22. In addition, the reduced weight of boiler and piping components resulting from the steel's superior performance compared with other standard steels allows higher resistance to thermal fatigue. Compared with austenitic steels, grade T/P91 has higher heat transfer and lower thermal expansion coefficients.

CHEMICAL COMPOSITION, %