Abstract: In accordance with the quality problem of austenite stainless steel during concasting, the taper of mould for 1260 mm×160 mm slab casting at No3 steelmaking shop,Taiyuan Iron and Steel was analyzed. It is obtained that to adopt two taper mould,that is to use larger taper at 80～200 mm near liquid surface and use minor taper at mould bottom 200~800 mm from liquid surface,is more suitable for the law of shrinkage of casting slab in mould than single taper mould by calculation of shrinkage of stainless steel casting slab in mould and analysis of effect of process parameters such as casting speed,degree of molten steel overheating on shrinkage of casting slab.Based on this foundation the curve taper mould has been designed,and the production test showed that the quality of casting slab was obviously improved by two taper mould design to eliminate narow face bulging and concave of slab.

Key words: Austenite Stainless Steel, Slab, Concasting, Taper of Mould

摘要： 针对奥氏体不锈钢连铸中的质量问题 ,对太钢三炼钢 1260mm× 160mm板坯结晶器的锥度进行了分析。通过不锈钢铸坯在结晶器内收缩的计算和拉坯速度、过热度等工艺参数对铸坯收缩影响的分析 ,得出采用双锥度结晶器比单锥度结晶器更符合铸坯在结晶器内的收缩规律 :液面附近 80～200mm区域采用较大锥度 ,液面下 200～800mm的结晶器下部 ,采用较小锥度 ,并在此基础上设计了曲线锥度结晶器。生产试验表明 ,双锥度设计显著改善了铸坯质量 ,消除了窄面鼓肚和中间凹陷等缺陷

关键词: 奥氏体不锈钢, 板坯, 连铸, 结晶器锥度