Abstract
The mechanisms of formation and the methods of controlling nonmetallic inclusions (NIs) in bearing steel are considered. The number and composition of NIs in electric furnace ShKh15SG-V steel bars made using various versions of heat and out-of-furnace treatment are studied by fractional gas analysis and number estimation according to State Standard GOST 801-79. A high calcium content is found to result in large globular NI numbers in the bars. Fractional gas analysis is shown to correctly determine the oxide inclusion content in steel.
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