Control of manganese sulfide inclusions in steel

Manganese sulfide (MnS) inclusions have a significant impact on the mechanical properties, machinability, and service life of steel. Therefore, the formation and evolution of MnS inclusions are controlled to enhance the overall performance of steel. By regulating the quantity, morphology, and distribution of MnS inclusions, it is possible to optimize steel’s machinability, improve fatigue resistance, and mitigate the negative effects of stress concentration on steel toughness. Moreover, appropriate control of MnS inclusions can significantly enhance the electromagnetic properties and corrosion resistance of steel. Therefore, the formation mechanism of MnS inclusions, the factors affecting their precipitation, and their effects on the steel properties were analyzed. Through a systematic analysis of recent researches, the main mor-phological classifications of MnS inclusions and their evolution under various processing conditions were summarized. Additionally, strategies for effective control of MnS inclusions through the addition of chemical elements and process adjustments were discussed. The goal of regulating MnS inclusions is to improve the mechanical and machinability properties of steel, providing theoretical and practical guidance for the optimization of future steelmaking processes.