VoL22 No.6 朱志远等：板坯连储结晶器内还壳厚度及枝晶间距 *5194 差最大为2.4mm,平均相差145mm.用结晶器 内钢水添加硫的方法确定坯壳厚度分布时，疏 扩散层的厚度为1.4mm,硫扩散层高度为4.8 mm. (4)板坯铸机结晶器内在考虑疏扩散时，内 弧的凝固系数为20.37mm/min,外弧的凝固系 数为24.85 mm/min2.在不考忠硫扩散层的情况 下，外弧的凝固系数为20.72 mm/min”,内弧的 凝固系数为16.91mm/mina. (⑤结晶器内坯壳一次枝晶间距为133m, 田5漏钢还亮外弧低倍组织 饱和苦味酸溶液+洗涤剂2滴80-0℃漫蚀2m血 二次枝晶间距为53m,由方程-29.0R5Gn Table 5 Macro-structure of steel shell in outside face 和la=112Ra”G51,结合推导所得的凝固速度 和温度梯度可以近似描述坯壳的一次和二次枝 表3枝墨询距测童结果 晶间距， Table 3 Result of the space between the dendrites um 测量值 计算值 参考文献 一次 二次 一次 二次 1 Morton SK,Weinberg F.Continuous of Steel.Joumal of the Iron and Steel Institute,1973(1):13 133 53 内弧160 内颤43 外弧132 外到35 2蔡开科，浇注与凝固.北京：冶金工业出版社，1992 3 陈家样，连线铸钢手册.北京：冶金工业出版社，1995 3结论 4 Eric A Brandes.Smithells Metals Reference Book.NY: ()用漏钢还亮厚度确定坯壳厚度分布的方 Butterworth&Co(Publishers)Ltd,1983 5 Tsuyoshi Saeki,Shigeru Oguchi,Shoao Mizoguchi,et al.Ef- 法易产生较大误差，用结晶器内钢水添加硫的 fect of Irregularity in Solidified Shell Thickress on Longi- 方法确定的坯壳厚度分布较为合理， tudinal Surface Cracks in CC Slabs.Tetsu-To-Hagane, (②)在不考虑疏扩散的情况下，在弯月面终 1982,6813):99 点下5mm以内，坯壳增长得很快.在离开弯月 6 Wolf MM.A Review of Published Work on the Solidific- 面终点5mm以下后，坯壳增长的速度减慢.至 ation Control of Steel in Continuous Casting Moalds by Heat Flux Measurement.Transactions ISIJ,1980,20:718 弯月面以下300mm处，坯壳厚度大约为 7 Lait JE,Brimacombe J K,Weinberg F.Mathematical 9-10mm.弯月面下120mm处坯壳厚度沿宽度 Modelling of Heat Flow in the Continuous Casting of 方向波动值为0.5mm. Steel.Ironmaking and Steelmaking.1974(2):90 (3)硫印法测得的结晶器外弧侧的坯壳厚度 8卢盛意连铸坯质量.北京：冶金工业出版社，1994 明显大于内弧侧坯壳厚度，两侧的坯壳厚度相 Shell Thickness Distribution in Mold and Space between Dendrites in the Shell of Continuous Casting Slab ZHU Zhiyuan,WANG Xinghua, WANG Wanjun, ZHANG Jiongming Metallurgy SchoolUSTBeijing Beijing 100083,China ABSTRACT The distribution thickness of steel shell was gotten by added the sulfur into the mould of con- tinuous casting slab.Use the steel shell thickness,the shape of meniscus,solidification coefficient of mould, solidification velocity and the gradient of temperature in shell were calculated. KEYWORDS continuous casting;slab;mold;steel shell