Occurrence of characteristic defects of grinding balls from rejects of continuously cast billets of rail steel

On the basis of metallographic studies, authors determined characteristic defects grinding balls rolled from rejects continuously cast billets K76F rail steel. Relationship presence internal with their impact resistance was established. Defects in form cracks accumulations non-metallic inclusions area localization and flocks have greatest on reduction resistance. Such are cause destruction during tests 62 17 % cases, respectively. The effect without significant quenching microcracks located along boundaries phase interface estimated at 12 9 %. regularities mechanism influence chemical composition steel probability produced them were An increase sulfur content studied reduces them, as it contributes to formation non-plastic sulfides that concentrate cracks. hydrogen naturally an flocks, which significantly reduce stability shock loads. carbon initial affects copra tests. It is explained by cementite-type carbides when corresponding eutectoid reached. In general, relative degree 48