研究了钢锭成材特厚板的尾部超声探伤缺陷的性质,介绍了模铸法生产大钢锭过程中,炉外精炼工艺、浇铸工艺以及浇铸用辅助材料对大钢锭内部质量的影响。通过对模铸用辅助材料、成品样及汤道样的能谱及化学分析可知,尾部面积缺陷的主要来源应该是钢液中的脱氧产物Al2O3以及少量没有被渣料吸附的复合化合物。针对缺陷的形成原因,制定了有效的改进措施,每月探伤的钢板尾部面积缺陷发生率由1.25%~2.25%降低到0.38%,最高降低幅度达到83.11%。 In this paper, the defects of ultrasonic flaw detection on the tailings of the slab ingot slab are studied. The influence of the external refining process, casting process and auxiliary materials for casting on the ingot quality during ingot ingot production is introduced. Through the energy spectrum and chemical analysis of the auxiliary materials, finished samples and soup samples, we can see that the main source of tail area defects should be the deoxidation product Al2O3 in the molten steel and a small amount of composite compounds not adsorbed by the slag. According to the formation reason of the defects, effective improvement measures were formulated. The incidence of tail defects per month for steel flaws was reduced from 1.25% to 2.25% to 0.38% with the maximum reduction reaching 83.11%.