T92/P92 (X10CrWMoVNb9-2)

 Definition

Grade T/P92 is a ferritic-martensitic (9 % chromium, 1.75 % tungsten, 0.5 % molybdenum) steel micro-alloyed with vanadium and niobium, and has controlled boron and nitrogen contents according to ASTM A 335, A 213 or to EN 10216-2 standard under the designation X10CrWMoVNb9-2.

 Application

In fossil-fuelled power plants, this grade is mainly used for high-temperature applications in superheater and reheater tubes, headers and steam piping (main steam and hot reheat).
 
 
 
 

 Challenges

Grade T/P92 exhibits excellent elevated-temperature strength and creep behavior up to 600 °C - 620 °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/P92 has higher heat transfer and lower thermal expansion coefficients.