大方坯连铸轻压下工艺技术开发与应用

连铸轻压下技术为改善铸坯内部质量,减少中心疏松、中心缩孔和中心偏析的重要手段。简述了连铸轻压下冶金技术的基本原理与主要控制参数。介绍了韶关钢铁(SGIS)大方坯连铸轻压下工艺技术开发方法,以及在研究过程中存在的问题和应用的效果。通过大方坯轻压技术的开发, 掌握了轻压下工艺控制方法与要点,以及轻压下工艺参数与铸坯中心疏松、中心偏析的关系。结果表明,大方坯连铸采用轻压下工艺,轴承钢内部质量得到明显的改善,其中轴承钢总压下量达到了12 mm。采用轻压下工艺后,低于1.5级的中心疏松比例提升了18.8%,中心偏析指数由0.877~1.247优化为0.944~1.038。研究结果为韶关钢铁开发高质量、高性能、高附加值的特钢产品提供了重要的技术支撑。

Development and application of soft reduction technology in bloom continuous casting

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.