From quantitative analysis and decrease of defects for continuous casting slabs to the concept of digital application
Under the carbon peaking and carbon neutrality goals,it is required to increase the hot delivery of slabs in continuous casting,which is meaningful only when the quality of the slabs is promised.Therefore,it is strongly necessary to develop digital and intelligent tools for improving the quality of slabs by analyzing the slab defects.Taking the slabs of a caster in Baoshan Base as the research object,statistical methods and thermodynamic calculations were firstly adopted to conduct a quantitative defect analysis from the perspective of composition and solidification structure.It was found the control range of influencing factors to obtain the low defect occurrence index,including adjusting the main alloy elements to control the carbon equivalent to the non-defect sensitive range,controlling Mn/S ratio and Ti/N ratio to go beyond the threshold of 500 and 3.2,and the Al × N product(％×％)to go below the threshold of 24 × 10-5(with Ti)and 8 × 10-5(without Ti).Using the above component optimization meanwhile ensuring the status of on-site equipment,the occurrence of hot rolling defects has been reduced by 75％.Then a digital intelligent application concept for continuous casting slabs to lower crack defects was proposed.This application achieves defect decrease and hot delivery improvement through the development of three modules,including smart process design,smart defect traceability,and smart defect prediction,which benefits the realization of highly efficient,green and intelligent in steelmaking process,safeguarding high-quality products of steels.
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