[en] Austenitic-ferritic stainless steel of the Kh(20-27)N(5-10) type additionally alloyed with vanadium, boron, aluminium, rare earth metals to increase creep resistance at 1100-1150 deg C, strength at room temperature, ductility at cryogen temperatures, plasticity during hot working, has been suggested. High mechanical properties are ensured by narrow limits of delta'-ferrite content (from 12 to 28%). The steel is recommended to be used for production of soldered and welded structures operating at the temperatures from 500 to -196 deg C practically in all branches of machine-building