Egang Steel's slab casting equipment has been in operation for over ten years.However,since the second half of 2020,discontinuous cracks deviating from the edge by 50-100 mm have been observed in 300 mm thick slabs.The cracking ratio of the rolled steel plates with a thickness of 300 mm reached 19.8％,resulting in a signifi-cant amount of slabs that could not be delivered as hot-rolled plates after edge cutting.Upon identifying the crucial factors through multiple rounds of testing and analysis,it was found that the increase in speed,steel composition,and nitrogen content had a certain impact on the formation of steel plate cracks.By modifying the process parame-ters,adjusting the molten steel composition,and controlling the nitrogen content,the deviating edge cracks on the 300 mm thick hot-rolled plates were essentially eliminated,and the edge crack rate was controlled to below 2％.
关键词
连铸板坯/偏离角裂纹/金相检验/N含量/裂纹控制
Key words
continuous casting slab/deviation angle crack/metallographic examination/nitrogen content/crack control
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