Influence of Heat System on MnS Inclusion in Heavy Rail Steel

摘要：

　　Influence of heat system on MnS inclusions in high rate heavy rail steel was systematically studied in the current study.The change process of MnS inclusions in casting bloom and steel rail were in-situ observed by confocal laser scanning microscope.According to the results of in-situ observation,the effect of heat and insulation treatment on MnS inclusions in casting bloom and steel rail was studied in the electrical resistance furnace.The laboratory results show that MnS inclusions begin to dissolve in the steel at about 1170-1180℃ and the slender MnS can be controlled through heat and insulation treatment in rail steel.Based on laboratory results,the plant trial of bloom heating and rolling under various gas temperature and holding time was performed.The morphology and distribution of MnS inclusions were compared.The exorbitant heating temperature leads to the formation of the strip MnS inclusions or reticular MnS along the grain boundaries during the cooling process.Thus,the key of MnS inclusions control in heavy rail steel is proper heating temperature and holding time to achieve the dissolution of MnS in the bloom edge and avoid the aggregation precipitation of the central MnS inclusions.

关键词： heavy rail steel heat system MnS inclusion dissolution

作者: Jianghua QI Jie WU Wangjun ZHU Maosong DONG Junjie FEI Guangyou CHEN

作者单位: Research Institute of Wuhan Iron & Steel(Group)Corporation,Wuhan 430080,China Long Product Plant of Wuhan Iron & Steel(Group)Corporation,Wuhan 430083,China

会议类型: 国际会议

会议名称: the 6th International Congress on the Science and Technology of Steelmaking,ICS2015(第六届国际炼钢科技大会)

会议地点: 北京

会议语种:英文

页码: 763-766

在线出版日期: 2015-05-12（万方平台首次上网日期，不代表论文的发表时间）