New generation of vanadium modified low-alloy chromium-molybdenum steels for hydrogen reactors has been reviewed. Three steels: 2.25Cr-1Mo-0.25V, 3Cr-1Mo-0.25V-Ti-B, 3Cr-1Mo-0.25V-Nb-Ca standardized according to ASME Boiler and Pressure Vessels Code, Section VIII Division 2 are presented and compared with conventional 2.25Cr-1Mo steel. Metallurgical characteristics, main properties and application limits of the steels has been shown. Microstructure and its effects on in-service degradation phenomena has been indicated.
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