Abstract：To solve the problem of slag-scratch defect on the surface of the 82B steel strand,a three-dimensional mathematical model of 180 mm×180 mm billet mold was built in the light of a continuous casting site. The study was based on the thought of increasing the temperature on the steel-slag interface and improving the melting and lubrication of mold slag. Under the use of mold electromagnetic stirring(M-EMS) process,the distribution of flow field and temperature in mold were compared with different straight bore type submerged entry nozzle. The results showed that,as the SEN internal-external diameter changed from 40/100 mm to 30/70 mm,the flow field zone with speed bigger than 0.15 m/s was enlarged near both sides of SEN,the impact of flow on the wall was weakened as the maximum speed on the horizontal section circumfluence decreased from 0.44 m/s to 0.42 m/s,and the maximum speed of molten steel on the mold surface increased from 0.12 m/s to 0.15 m/s,the area with high temperature was expanded. Comprehensive effects indicated that with the decrease of the inner-outer diameter of SEN,the temperature of molten steel near the slag-steel interface increased while the flow field in the mold has a relatively small impact. According to the field measured data,after decreasing the inner-outer diameter of SEN,the consumption of mold slag increased from 0.189 kg/t to 0.228 kg/t and the occurrence of slag-scratch defect on billet surface decreased obviously. It indicated that the slag melting at the molten steel surface was good and the lubrication effect was improved. The mathematical model can provide a good guide for optimizing the production process.
左小坦, 赵立, 张洪彪, 陶群南, 陈永峰, 王强强. 浸入式水口对82B钢方坯渣沟缺陷的影响[J]. 钢铁, 2020, 55(10): 43-49.
ZUO Xiao-tan, ZHAO Li, ZHANG Hong-biao, TAO Qun-nan, CHEN Yong-feng, WANG Qiang-qiang. Effect of SEN structure on slag-scratch defect of 82B strand surface during continuous casting[J]. Iron and Steel, 2020, 55(10): 43-49.
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2020, Vol. 55 
