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49.3%增加到75.3%,提高了52.7%;平均等轴晶晶粒尺寸减小55.4%,等轴晶晶粒尺寸达到4.1mm。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 14.6 mm.Equiaxed grain rate of cast ingot raises 49.3% from 51.2% to 75.3% with 3% strip fed.Size of refined grain decreases to 4.1 mm.A suitable area rate of steel strip-feeding recommended is 1%.
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