Analysis of element segregation behavior in casting billet and rolled product
ZHANG Haibo1, WANG Min*1,2, GAO Yubo1,3, ZHANG Mengyun1, YAO Cheng1, BAO Yanping1
1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing,Beijing 100083,China; 2. Technical Support Center for Prevention and Control of Disastrous Accidents in Metal Smelting,Beijing 100083,China; 3. Technology Center,Zenith Steel Co.,Ltd.,Changzhou 213000,China
Abstract：Due to the high content of carbon in tire cord steel, it is very easy to cause central segregation, looseness and shrinkage hole defects in the continuous casting process, which affect the stability of the finished products. At present, as one of the effective ways to improve the internal quality of casting billets, the soft reduction process is widely used in continuous casting production. Taking LX86 tire cord steel as an example, the experimental schemes under soft reduction at different tensile speeds were formulated to carry out industrial tests. The elemental segregation in casting billet and rolled product was examined after industrial tests by carbon-sulfur analyzer and electron probe micro analyzer (EPMA). The results showed that when the tensile speed was set at 2.2 m/min, the center segregation index of carbon in casting billet decreased from 1.136 to 1.062. The segregation index of carbon and silicon in the rolled product was improved. The uniformity of internal elements in the casting billet was effectively improved. This study provided support for the quality stability of the subsequent finished products.
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