Control practice of residual boron element in high strength automotive steel
In view of the problem that the residual boron element content of 420MPa high strength auto?motive steel produced by a steel plant in Tangshan exceeds the standard(>10ppm), which leads to the low performance of the finished plate, the composition of molten iron, alloy materials and auxiliary materi-als in the steel-making process is detected, and the turnover and use situation of the ladle are counted and analyzed. In this paper, according to the results of composition detection and data analysis, the main factors affecting the abnormal increase of residual boron element content in steel are determined to be the type of alloy used and the number of ladle turnover, and process improvement measures accordingly are proposed. Through optimizing the type of alloy used and limiting the number of ladle turnover, the target that the residual boron element content of high strength automotive steel is not more than 10ppm is achieved,the alloy cost is reduced while meeting the product property requirements.
high strength automotive steelresidual boron elementtype of alloynumber of ladle turn-over