高碳工具钢板坯连铸生产工艺优化
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摘要
以某钢厂板坯连铸机生产高碳钢BJS55C为研究对象,结合钢种高温力学实验,优化了高碳钢BJS55C连铸生产工艺。其中对铸机弯曲段二次冷却强度减弱,调整各区冷却水分配,使板坯通过矫直区避开了脆性温度区间,板坯角部裂纹发生率降低41%;优化动态轻压下压下区间,压下量在原有基础上增加15%,板坯低倍指数由2.6改善到2.0;高碳钢保护渣熔点由1 100℃降低到980℃,保护渣黏度(Pa·s,1 300℃)由0.14降低到0.08,保护渣熔化效果与透气性得到明显改善。解决了板坯连铸生产高碳钢的一些关键难题,实现了高碳钢连铸的批量稳定生产。
Combined with the high temperature mechanical experiments of steel grades,the production process of high carbon steel BJS55C was optimized in a steel plant. The secondary cooling intensity of bending section was weakened,and the distribution of cooling water in each zone was adjusted to avoided the brittle temperature range. As a result,the incidence of corner cracks of slab was reduced by 41%. The dynamic soft reduction zone was optimized. Meanwhile,the reduction increased by 15%. As a result,the macrostructure index of slab improved from 2.6 to 2.0. The melting point of high carbon steel mold flux was decreased from 1 100 ℃ to 980 ℃,and the viscosity of mold flux at 1 300 ℃decreased from 0.14 Pa · s to 0.08 Pa · s. The melting effect and permeability of mold flux were obviously improved.Some key problems in the production of high carbon steel slab were solved,and the batch stable production of high carbon steel by continuous casting was realized.
Combined with the high temperature mechanical experiments of steel grades,the production process of high carbon steel BJS55C was optimized in a steel plant. The secondary cooling intensity of bending section was weakened,and the distribution of cooling water in each zone was adjusted to avoided the brittle temperature range. As a result,the incidence of corner cracks of slab was reduced by 41%. The dynamic soft reduction zone was optimized. Meanwhile,the reduction increased by 15%. As a result,the macrostructure index of slab improved from 2.6 to 2.0. The melting point of high carbon steel mold flux was decreased from 1 100 ℃ to 980 ℃,and the viscosity of mold flux at 1 300 ℃decreased from 0.14 Pa · s to 0.08 Pa · s. The melting effect and permeability of mold flux were obviously improved.Some key problems in the production of high carbon steel slab were solved,and the batch stable production of high carbon steel by continuous casting was realized.
引文
[1]刘国梁,倪有金,马文俊,等.迁钢板坯连铸高碳钢的生产技术[J].连铸,2017,42(2):72.
[2]任迅.减少高碳钢质量异议的攻关实践[J].连铸,2003,(5):37.
[3]刘国梁,马文俊,倪有金,等.高碳钢板坯表面缺陷控制技术研究[C]//2016年(第十九届)全国炼钢学术会议论文集.北京:中国金属学会,286.
[4]朱苗勇,祭程,罗森.连铸坯的偏析机器控制[M].北京:冶金工业出版社,2015.
[5]杨学富.宝钢1 930 mm连铸生产高碳钢技术探讨[J].2005年中国钢铁年会论文集,398.
[2]任迅.减少高碳钢质量异议的攻关实践[J].连铸,2003,(5):37.
[3]刘国梁,马文俊,倪有金,等.高碳钢板坯表面缺陷控制技术研究[C]//2016年(第十九届)全国炼钢学术会议论文集.北京:中国金属学会,286.
[4]朱苗勇,祭程,罗森.连铸坯的偏析机器控制[M].北京:冶金工业出版社,2015.
[5]杨学富.宝钢1 930 mm连铸生产高碳钢技术探讨[J].2005年中国钢铁年会论文集,398.