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为解决生产的钢板出现较多探伤不合格的问题,采用高倍金相检验、扫描电镜及能谱分析等手段对探伤不合格的中厚板进行取样分析。发现探伤不合格的原因有:钢板的内部存在较严重的偏析,偏析带形成异常组织导致内部产生微裂纹;钢板夹杂物含量高,特别是硫化物夹杂严重影响钢板探伤质量;钢板存在较严重的疏松,在轧制过程中未完全焊合;钢板晶粒特别粗大,影响探伤检验结果;钢板虽然内部质量满足标准要求,但是由于表面氧化铁皮较厚,也会影响钢板探伤质量。通过优化精炼、连铸及轧制工艺后,钢板探伤三级合格率达到95.7%,探伤正品率达到了99.6%。
In order to solve the problem of more unqualified steel sheets produced by the test, high-power metallographic examination, scanning electron microscopy and energy spectrum analysis were used to sample and analyze the unqualified medium and heavy plates. The reasons for the unqualified flaw detection are as follows: the segregation inside the steel plate is more severe, the segregation zone forms abnormal structure and leads to microcracks in the interior; the content of steel plate inclusions is high, especially the sulfide inclusions seriously affect the flaw detection quality; Loose, not fully welded in the rolling process; particularly coarse steel plate, affecting the test results; Although the internal quality of steel to meet the standard requirements, but the thicker the surface of the oxide scale will also affect the quality of steel flaw detection. After optimizing the refining, continuous casting and rolling processes, the three-pass rate of steel flaw detection reaches 95.7%, and the true rate of flaw detection reaches 99.6%.