Slab Surface Quality of 1.35% Al-TRIP Steel
The slab surface defect status of 1.35%Al-TRIP steel during the continuous casting process in a steel plant were investigated by SEMand mold fluxes reactivity were researched by thermodynamic calculations and high temperature static balance experiments.The results show that the reactive mold flux occurred a significant variation on chemical composition during the CC process of 1.35% Al-TRIP steel.This variation leaded to serious deterioration in mold flux properties and inhomogeneous solidification shrinkage on slab shell.As a result,the incidence of indentation and irregular oscillation marks on slab surface were increased.Meanwhile,the present study found some micro-cracks distributed along the grain boundary in indentation surface or subcutaneous.Inclusions contained K,Na were found in some indentationsampleswhile no such inclusions were found in the normal samplessurface.These findings indicatedthat changing the chemical compositions of mold flux such as improvingAl2O3/SiO2on mass can reduce the reactivity of mold flux-steel obviously.In addition,the viscosity of mold flux tended to stable when Al2O3/SiO2 increased to 1.18.After that,increasing Al2O3/SiO2has little influence on mold flux-steel reaction.
Al-TRIP steel surface indentation cracks non-metallic inclusion mold flux reactivity
CUI Heng ZHANG Kaitian WANG Zheng CHEN Bing LIU Baisong QING Jing
Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, B Engineering Research Institute, University of Science and Technology Beijing, Beijing 100083, China Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, B Shougang Technology Research Center, Shougang Corporation, Beijing 100043, China Beijing Shougang Co. Ltd., Beijing 100043, China
国际会议
成都
英文
454-458
2016-11-16（万方平台首次上网日期，不代表论文的发表时间）