12%CrMoV steels are used for critical heat and creep
resisting service up to at least 550ºC. The high
chromium level confers superior steam and fireside
corrosion performance compared with 2-9%CrMo
Used in cast and wrought form for high pressure
steam piping and headers, heat exchangers and
turbine components, particularly in the power
generation industry and sometimes in petrochemical
12%Cr creep resisting steel also with nominally
1%Mo-0.5%W-0.3%V. The matching base material is
generically called X20.
In the PWHT condition the microstructure consists of
Materials to be welded
EN W.Nr.: X20CrMoV 12 1 (1.4935):
G-X22CrMoV 12 1 (1.4931) cast.. ASTM: AISI Type 422.