在CSP产线生产的Q235B钢卷表面发现点状缺陷。通过对点状缺陷进行EPMA、SEM、EDS和金相等分析,并结合现场的轧制工艺情况,对Q235B钢的点状缺陷形成原因进行综合分析。分析结果表明:在加热过程中,较高的C在加热的氧化气氛中易脱碳产生CO、CO2气体,导致表面的氧化铁皮出现起皮现象,除鳞难以改善,在后续的轧制过程中碾压,形成了点状缺陷。 Spot defects were found on the surface of Q235B coils produced on the CSP line. Through the analysis of point defects EPMA, SEM, EDS and gold, combined with the scene of the rolling process, Q235B steel point defects on the causes of a comprehensive analysis. The results show that during the heating process, the higher C is easy to decarbonize in the heated oxidizing atmosphere to produce CO and CO2 gas, which leads to the peeling phenomenon of the scale on the surface and the descaling difficult to be improved. In the subsequent rolling process Rolling, the formation of punctate defects.