管线钢作为石油、天然气等管道运输的主要材料，其元素分布及组织结构对管线钢强度和韧性有较大影响。实验采用原位统计分布分析技术对管线钢连铸板坯板宽中心到板宽1／4处的中心区域中C、Mn、P、S、V、Ti、Nb元素的偏析和分布状态进行了定量统计分析研究。采用最大偏析度、统计偏析度、统计均匀度等指标对各元素的偏析分布进行了定量表征。研究结果表明，C、Mn、P、S、V、Nb元素的偏析分布形式基本类似，都在板厚中心线附近和板宽1／4处的厚度方向存在由局部富集区域组成的带状偏析带。其中，C、P、S元素的偏析较为严重，统计偏析度达到20％以上。Ti元素没有观察到明显的偏析，在整个分析区域分布比较均匀。%T he pipe line steel is the main material of pipeline transportation for petroleum and natural gas . The elemental distribution and structure has great influence on the strength and toughness of pipe line steel .The segregation and distribution of C ,Mn ,P ,S ,V ,Ti and Nb in central area from center to 1/4 slab width of continuous casting slab of pipe line steel were quantitatively analyzed and investigated by o-riginal position statistic distribution analysis technology . The segregation distribution of elements was quantitatively characterized using the indexes including maximum segregation degree ,statistical segrega-tion degree and statistical homogeneity degree .The results indicated that the segregation distribution form of C ,Mn ,P ,S ,V and Nb was almost similar .A ribbon segregation area composed of partial rich regions existed near centre line and 1/4 width in slab thickness direction for all elements .The segregation of C ,P and S was relatively severe ,and the statistical segregation degree was above 20% .The obvious segrega-tion of Ti was not observed ,and its distribution in whole analysis area was uniform .
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