研究了不同凝固组织下管线钢的中心偏析情况.低倍组织腐蚀结果表明,连铸板坯的中心偏析由相对独立的、大小不一的半宏观偏析点组成,且不同凝固组织的半宏观偏析特征有所差别.化学成分分析表明,中心等轴晶时板坯中心为负偏析,且贯穿于整个等轴晶区中,而中心为柱状晶时则表现为正偏析.通过对比化学成分和半宏观偏析面积比发现,板坯的半宏观偏析面积比随C和Mn最大偏析度的增加而增加,由于化学成分分析只能反应局部位置的偏析情况,因此半宏观偏析面积比的方法对生产实践更具有指导意义.对不同过热度下不同凝固组织的半宏观偏析面积比的统计结果显示,在合理使用轻压下技术的前提下,中心为柱状晶更有利于减轻半宏观偏析面积比,进而改善管线钢连铸板坯的中心偏析. The center segregation of pipeline steel under different solidification microstructures was studied.The results of low magnification show that the center segregation of continuous slab consists of relatively independent semi-macroscopic segregation points with different sizes and the semi-macroscopic segregation of different solidified structures The chemical composition analysis shows that the central equiaxed slab center is negative segregation, and runs through the entire equiaxed zone, while the center columnar crystals showed positive segregation.By comparing the chemical composition and half Macroscopic segregation area ratio found that the semi-macro segregation area ratio of slab increases with the increase of maximum segregation degree of C and Mn. Because chemical composition analysis can only reflect the segregation of local locations, the method of semi-macro segregation area ratio It is more instructive.The statistical results of the semi-macropore segregation area ratios of different solidified tissues under different superheating temperatures show that the center columnar crystal is more conducive to reduce the semi-macro segregation area ratio under the premise of rational use of soft reduction technology, and thus Improve center segregation of continuous casting slab in pipeline steel.