HIGH-TEMPERATURE RADIATION-RESISTANT FERRITE-MARTENSTEAL STEELS

摘要

The invention relates to compositions of new high-temperature radiation-resistant ferritic-martensitic steels. New steels generally contain 9.0-12.0 wt.% Cr; 0.001-1.0 wt.% Mn; 0.001-2.0 wt.% Mo; 0.001-2.5 wt.% W and 0.1-0.3 wt.% C, the rest is mainly Fe. More specifically, steels containing 10.0–12.0 wt.% Cr are considered particularly advantageous. A small amount of N, Nb, V, Ta, Ti, Zr and B may also be present or not present, depending on the particular embodiment. Impurities may be present in any embodiment, in particular, impurities of less than 0.01 wt.% S, less than 0.04 wt.% P, less than 0.04 wt.% Cu, less than 0.05 wt.% Co and less than 0 are permissible. 03 wt.% As. Examples of these steels show improved fracture toughness and reduced thermal creep and swelling.