不锈钢板坯连铸自由线收缩与辊缝研究  

Linear Contraction and the Related Basic Roller Gap for Stainless Slab Casting

作　　者：陈洪智[1] 常运合[1] 张家泉[1] 谢茂恩 杨东 李六一 

机构地区：[1]北京科技大学高效钢铁冶金国家重点实验室,北京100083 [2]西南不锈钢有限责任公司,四川乐山614951

出　　处：《中国冶金》2012年第2期25-30,共6页China Metallurgy

摘　　要：建立了连铸板坯凝固传热与自由线收缩计算模型。揭示了不锈钢板坯连铸凝固与冷却过程线收缩的一般规律,为铸机基础辊缝锥度曲线的设计提供了合理依据。针对304不锈钢板坯连铸,结合实际生产冷却条件的计算分析表明:连铸过程板坯厚度的自由线收缩在二冷初期较为平缓,二冷后期铸坯凝固末端附近为快速线收缩阶段;目标表面温度下,拉速对板坯厚度线收缩量与线收缩率差异影响显著;板坯断面厚度影响次之,浇铸过热度影响不明显。此外,板坯厚度的线收缩沿宽向分布并不均匀,其中角部附近的线收缩量最大,不同部位的线收缩范围构成了该钢种连铸的辊缝设定操作窗口。The computational models for the analysis of heat transfer and related linear contraction of slab casting have been developed for the continuous casting process.The temperature profile,solidification progress and the linear contraction in the thickness direction have been revealed accordingly.Based on the in-situ casting condition of 304 stainless steel,it is shown that the slab linear contraction develops slowly at the initial period of the secondary cooling,but shows quick development at the final stage of the cooling zone while approaching the crater end.The remarkable differences of the total contraction amount and linear contraction rate have been observed for slab under its varied casting speed.The contribution from the thickness of slabs,however,is observed only at the later stage of the slab solidification.There is no remarkable variation of the slab contraction behavior for different casting temperature.Moreover,uneven contraction phenomenon has been revealed in the wide face of the slab casting,in which larger linear contraction is produced away from the centre with maximum at corners.And the different linear contractions in the wide face of the slab constitute the roller gap window of the casting steel.

关 键 词：连铸板坯 不锈钢 凝固线收缩 铸机辊缝 

分 类 号：TF777.1[冶金工程—钢铁冶金]