Reduced-Activation Steels: Future Development for Improved Creep Strength

Abstract

Reduced-activation steels for fusion applications were developed in the 1980s to replace the elevated-temperature commercial steels first considered. The reduced-activation steels were patterned after the commercial steels, with the objective that the new steels have strengths (yield stress and ultimate tensile strength) and impact toughness in a Charpy test comparable or better than the steels they were replacing. That objective was achieved in steels developed in Japan, Europe, and the United States. Although tensile and impact toughness of the reduced-activation steels exceed those of the commercial steels they were patterned after, their creep-rupture properties are inferior to some commercial steels they replaced. They are even more inferior to commercial steels developed since the 1980s. In this paper, compositional differences between reduced-activation steels and new commercial steels are examined, and compositions are proposed for development of improved reduced-activation steels.