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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%。
Mold feeding technology by controlling the distribution of melt temperature field, inhibition of columnar growth to improve the slab composition segregation, loose core and other defects. Through the experimental design system, the effects of different thickness strip melting process and strip feeding ratio on the slab structure were studied. The results show that the melting process of steel strip in constant temperature molten steel is divided into two stages. The residual strip thickness increases rapidly with the feeding time and increases by 100% at the beginning. When the strip thickness reaches the maximum, the strip begins to decrease slowly, Until the steel melt in the molten steel, then the residual thickness of the steel becomes zero. The original thickness of the strip and superheat of the molten steel affect the end point of the melting temperature of the strip. With the increase of the thickness and the decrease of the superheat, the end of the melting time is prolonged. The maximum melting time is less than 100s in the strip thickness range, With the law of melting. The strip feeding ratio affects the equiaxed grain size of the slab and the equiaxed grain size. The strip feeding ratio increases from 0% to 3%, and the equiaxed grain yield increases from 49.3% to 75.3%, an increase of 52.7 %; The average equiaxed grain size decreases 55.4%, the equiaxed grain size reaches 4.1mm. Steel strip feed ratio is too large lead to defects in the slab core loose, steel feed ratio of 1%.