高碳钢盘条中心偏析的控制

Segregation Controlling of High Carbon Steel Wire Rod

研究了不同铸坯中心偏析成分在控冷过程中的相变行为,结果表明,铸坯中心成分偏析是导致高碳钢盘条中心出现马氏体的主要原因,而马氏体又是导致盘条拉伸出现尖状断口的主要原因;铸坯中心碳偏析指数不能超过1.12及综合偏析指数小于1.20,才能在控冷过程中不出现中心马氏体;通过降低过热度、实施末端电磁搅拌、轻压下并适当调整盘条控冷工艺等措施,连铸坯中心碳偏析指数由1.18减小到1.10,盘条的中心马氏体、尖断明显减少。

The main cause of martensite formation in central part of wire rod is central segregation in the bloom as determined by this study and martensite makes sharp fracture of the wire rod. It was shown that index of carbon central segregation in bloom should be less than 1.12 and index of total central segregation should be less than 1.20, to avoid martensite, the index of central carbon segregation in the bloom can be reduced from 1.18 to 1.10 by reducing over heat of molten steel in tundish and using electromagnetic stirring and soft reduction, to reduce sharp fracture.