应用有限元法分析计算了STB等底枪型复吹转炉中,底吹喷嘴砖周围的热应力及其影响因素。喷吹过程中热应力主要集中在喷嘴出口附近;在各热应力分量中,环向挤压分量最为显著,而且在喷嘴出口附近远远超出镁碳砖所能承受的范围,因而必然产生裂纹,使砖容易剥落。 The thermal stress around the bottom blown nozzle bricks and its influencing factors were calculated and analyzed by using finite element method. In the process of blowing, the thermal stress mainly concentrates near the exit of the nozzle. Among the components of the thermal stress, the circumferential extrusion component is the most significant, and it is far beyond the range that the magnesia-carbon brick can bear near the exit of the nozzle, Bricks easily peel off.