Martenzitické modifikované (9–12)% Cr oceli pro energetiku

development of martensitic modified (9–12)% Cr steels.
They represent prospective structural materials for modern
blocks of thermal power plants for supercritical and
ultra-supercritical steam parameters. They are used
for the production of components from wrought steels
(steam pipes, boiler tubes, rotors, turbine blades)
as well as for the production of castings (turbine cases).
The attention is paid to their chemical composition, heat
treatment regimes, long-term creep behaviour, evolution
of microstructure during heat treatment and long-term
creep exposure, mechanisms of embrittlement and
oxidation resistance. Creep properties of this group
of steels are limited by phenomena of structural instability.
Based on the present knowledge it is supposed that
these steels can be used for the construction of power
plant components up to the service temperature
of ca 625 °C.