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
creep-resisting steels.
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
applications.
Alloy type
12%Cr creep resisting steel also with nominally
1%Mo-0.5%W-0.3%V. The matching base material is
generically called X20.
Microstructure
In the PWHT condition the microstructure consists of
tempered martensite.
Materials to be welded
EN W.Nr.: X20CrMoV 12 1 (1.4935):
G-X22CrMoV 12 1 (1.4931) cast.. ASTM: AISI Type 422.
