Abstract
1. The operating capacity of high-strength steel 38Kh5MSFA in structures with the same ultimate breaking strength depends markedly on the structural state. A high and stable structural strength (σbre/σf ≥ 1.0) with ductile breaking of model vessels is achieved after quenching and tempering at 300°C. Tempering at 560°C leads to nonuniform distribution of carbides in the steel structure and to brittle failure of vessels with σbre/σf ≅ 0.74−0.92. An estimate of the tendency towards brittle failure from the characteristics ac, σfc, and KC gives a more complete idea of the operating capacity of the steel structures. 2. A reduction in carbon content in steel type Kh5MFSA from 0.4 to 0.25–0.35 promotes after the optimum heat treatment indicated a marked increase in resistance to brittle failure and an increase in the breaking stress with rupture of specimens with a central crack σfc, and in spite of a reduction in the ultimate breaking strength and yield strength.
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