Estimation of the Ultimate Fracture Toughness of Structural Steels under Stress Concentrations

Considering a steel type based on the behavior pattern of an alloy’s basic mechanical characteristics, a correlation has been found between the following: the characteristics of the ultimate fracture toughness of structural steels at the critical embrittlement onset temperature T b in the compound stress state B rNFb and B rC 0 b and the fracture toughness in the uniaxial stress state B rb through parameters that reflect the metal state in the loading elastic–plastic range. A method for the rational selection of structural steels for products that operate under the action of nonuniform force fields of different strengths has been developed.