结晶器喂带技术通过控制熔体温度场的分布、抑制柱状晶生长来改善连铸坯的成分偏析、芯部疏松等缺陷。通过试验设计系统研究了不同厚度钢带在钢液中的熔化过程以及钢带喂入比对铸坯组织的影响。结果表明：钢带在恒温钢液中的熔化过程分为两个阶段，开始时钢带残余厚度随喂入时间快速增加，增加比达到100%；钢带厚度达到最大值后开始缓慢减小，直到钢带在钢液中全部溶化，此时钢带残余厚度变为零。钢带原始厚度和钢液过热度影响钢带融化终点时间，随着厚度增加和过热度减小，融化终点时间延长；研究钢带厚度范围内，最大融化时间小于100s，过热度增加没有改变钢带融化规律。钢带喂入比影响铸坯等轴晶率和等轴晶晶粒大小，钢带喂入比从0%增加到3%，铸坯等轴晶率从493%增加到753%，提高了527%；平均等轴晶晶粒尺寸减小554%，等轴晶晶粒尺寸达到41mm。钢带喂入比过大导致铸坯芯部疏松缺陷，钢带合适喂入比为1%。
Steel strip-feeding in mold process was a effective technical to improve quality of continuous casting product. Melting process of steel strip in mold was general researched. Ingot structure was tested simultaneously. Results show that feeding-strip melting in molten steel presents two stages: the solidified stage and melted stage. Remaining strip shows a thickness increase of 100 percent in solidifying stage. Terminal time of strip melted in molten steel is decided by strip thickness and degree of superheat. It is less than 100 s with maximal thickness of 146 mm. Equiaxed grain rate of cast ingot raises 493% from 512% to 753% with 3% strip fed. Size of refined grain decreases to 41 mm. A suitable area rate of steel strip-feeding recommended is 1%.
参考文献
| [1] | |
| [2] | Ian Christmas.钢铁工业面临的挑战.2005中国钢铁年会论文集[M]，北京，冶金工业出版社.2005: 1-6 [2]李延生.连铸坯缺陷的成因及防止对策[J].炼钢，1998, 3:55-58 [3]蔡开科.连铸铸钢(M).北京，科学出版社，1991: 248-255 [4]裴云毅. 宝钢的连铸生产[J]. 宝钢技术, 1996(4): p. 6-10. [5]朱诚意, 李光强, 饶江平, et al. 连铸薄板坯的质量缺陷及其改善措施研究[J]. 上海金属, 2006. 28(2): p. 15-20. [6]金铁城,于阳. 转炉炼钢新工艺、新技术与质量控制实用手册[M]. 2004(4), 北京: 当代中国音像出版社. [7]李维彪, 王芳, 齐凤升和李宝宽. 结晶器喂钢带连铸坯凝固过程的数学模拟[J]. 金属学报, 2007. 43(11): p. 1191-1194. |
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