连铸生产工艺优化降低SWRH82B 高碳钢C偏析实践

ownstream customers of the company frequently encounter fracture problems when using SWRH82B wire rods for steel strand drawing. The fracture surfaces show brittle fractures and pen-tip-shaped fractures. Therefore, inspection and analysis of chemical composition, inclusions, and metallographic structure are carried out on the original wire rods used by customers and the semi-finished products with drawing fractures. The results show that the brittle fractures reported by customers this time are mainly caused by collisions on the original wire rods, resulting in obvious appearance defects such as scratches. The pen-tip-shaped fractures reported by customers are mainly caused by C segregation, which is caused by unreasonable parameters such as superheat during production, drawing speed, secondary cooling water distribution, and electromagnetic stirring. Therefore, technicians have improved the process, effectively reducing the central segregation and C segregation index, and significantly reducing the probability of fractures during the drawing of SWRH82B wire rods.