Cause analysis and control measures of surface transverse crack of Q345E steel plate
In the process of Tianjin Iron and Steel Group Co., Ltd. organizing the production of Q345E steel plate, it was found that transverse cracks frequently appeared on the surface of the finished steel plate. In order to find out the cause of production of the steel plate surface crack, scanning electron mi⁃croscope and energy spectrum analyzer were used to detect the transverse cracks on the surface of Q 345E finished steel plate and the corresponding continuous casting billet. According to the detection results of scanning electron microscope and energy spectrum analyzer, as well as the process tracking and investi⁃gation situation, this paper analyzes the causes of production of the cracks of Q345E steel plate, and con⁃firms that the surface cracks of this finished steel plate are caused by the surface cracks of the continu⁃ous casting billet, while the unqualified physical and chemical indicators of mold fluxes and the exces⁃sive flow of cooling water in the mold are the main reasons for producing the continuous casting billet sur⁃face transverse cracks of Q345E steel. Through adjusting the physical and chemical indexes of Q345E steel mold fluxes also strictly inspecting, and appropriately reducing the cooling water flow of the mold, the transverse cracks on the surface of Q345E steel plate and continuous casting billet were effectively controlled.
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