论述了鞍钢 7号高炉自焙炭块 -陶瓷砌体复合炉缸的结构特征 ;指出了结构设计中需改进的问题 ;分析了五年中修停炉后对复合炉缸结构状况的调查结果 ,认为风口下三层局部区域自焙炭块疏松脆化的主要原因是疏松层部位没有达到自焙温度、碱金属侵入蚀损所致·停炉打水浸泡后 ,使疏松程度加剧 The structural characteristics of self-baking carbon block-ceramic masonry composite hearth in No.7 blast furnace of Anshan Iron and Steel Co., Ltd. are pointed out. The problems that need to be improved in the structural design are pointed out. The investigation results of the structure of the composite hearth, It is considered that the main reason for the loose embrittlement of self-baking charcoal in the three areas under the tuyere is that the parts of the slack layer do not reach the self-baking temperature and the alkali metal intrudes and loses the corrosion.