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| Development and application of soft reduction technology in bloom continuous casting |
| YE De-xin, ZENG Ling-yu, QIU Wen-sheng, LIU Zhi-ming |
| Baowu Group Guangdong Shaoguan Iron and Steel Co., Ltd., Shaoguan 512123, Guangdong, China |
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Abstract Soft reduction technology of continuous casting is an important method to improve the internal quality of blooms and reduce the center porosity, center shrinkage and center segregation. Basic principle and main control parameters of continuous casting with soft reduction technology are described.Development method of soft reduction technology for bloom continuous casting at SGIS, the problems existing in the development process and the effect of application are introduced. Control method and key points of the soft reduction process, as well as the relationship between the parameters of the soft reduction process and the center porosity and center segregation of the bloom are mastered through the research on the soft reduction technology of bloom. The results show that the internal quality of bearing steels can be improved obviously by using the soft reduction technology in bloom continuous casting. The ratio of central porosity below 1.5 is increased by 18.8%, and the central segregation index is optimized from 0.877-1.247 to 0.944-1.038. The research results provide important technical support for SGIS to develop high quality, high performance and high added value products.
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Received: 17 February 2020
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2020, Vol. 39 
