轻压下对管线钢连铸坯中心偏析影响的研究  

Study on the effect of dynamic soft reduction on the centerline segregation of continuously casting pipeline steel slab

作　　者：张开钧[1] 王新华[1] 刘洋[1] 李秀刚[1] 张炯明[1] 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083

出　　处：《炼钢》2009年第1期51-54,65,共5页Steelmaking

摘　　要：介绍了不同的动态轻压下位置对铸坯内部质量的影响。通过对试验铸坯横断面的低倍枝品检验和沿铸坯厚度方向上的化学成分分析，发现动态轻压下对连铸板坯中心偏析的改善效果十分明显。枝晶检验结果表明，5块X70管线钢试验铸坯中心偏析等级均在B0．5以下，中间裂纹和三角区裂纹等级也都小于0．5。虽然5块铸坯的轻压下位置有所不同，但铸坯内部质量均为良好，达到内控标准。同时根据化学成分分析结果计算元素沿厚度方向上的偏析比发现：浇铸管线钢板坯较佳的动态轻压下位置应为fs=0．5～0．8。This paper introduces the effect of different position of dynamic soft reduction on the inner quality of continuously casting slab. By etching the testing sample of the slab and checking and examining the dendrites over the cross section of the slab sample as well as analyzing the chemical compositions of the sample along the gauge direction it＇s found out that the effect of dynamic soft reduction on the improvement in the central line segregation of the slab is extremely prominent. Results of the dendrite examination show that the central line segregation grades of all five testing samples of the slab for X70 pipeline steel are below B0.5 and both the internal crack grade and crack grade over the triangular zone are less than 0.5. Although the positions of the dynamic soft reduction for the five testing slabs are different, yet the internal quality of all the slabs are excellent and they are all in conformity with the inner control standards. In the meanwhile by calculating the segregation ratio of the elements along the gauge direction according to the analysis of the chemical compositions of the sample it＇s found that the more desirable position of the dynamic soft reduction for the pipe line slab should be fs= 0. 5-0. 8.

关 键 词：连铸板坯 管线钢 动态轻压下 中心偏析 

分 类 号：TF777.1[冶金工程—钢铁冶金]