Abstract
1. Within the investigated limits (0.002–0.098%) sulfur has practically no influence on the static strength and ductility of steel at normal temperature. 2. With an increase in sulfur content from 0.007 to 0.098% the impact strength of 17G1S steel continuously decreases and there is a simultaneous drop in the critical temperature T50. With a reduction in sulfur content from 0.007 to 0.002% there is sharp decrease both in impact strength and in the share of fibrous structure in the fracture, which is related not only to the decrease in sulfur content but also to obtaining coarser ferrite grains after normalizing. 3. The use of a special heat treatment makes it possible to obtain a fine-grained structure in steel with 0.002% S and correspondingly to increase the impact strength. At the same time, the positive influence of sulfur on the critical brittleness temperature is maintained (T50 drops).
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