Analysis of the total oxygen content and inclusions in 410S ferritic stainless steel during smelting process

The total oxygen content and inclusions in 410S ferritic stainless steel produced by the route of hot metal pretreatment→AOD→LF→CC were studied.The results show that the total oxygen content,inclusions quantity and the inclusions size decrease throughout the AOD→LF→CC process.The inclusions after the AOD reduction and are mainly CaO-SiO2-MgO-Al2O3 compounds,while in LF refining and tundish.Additionally,the types of inclusions change at the different stage of the process.The variation of the composition of the inclusions during the route of AOD→LF→CC are related to the smelting process.The technology improvement measures in manufacture have been accepted on the basis of the research.The inclusion level of the steel are improved effectively and significantly reduce the occurrence of surface defects of cold-rolling plates.