宽厚板坯窄面鼓肚分析及解决措施

Analysis on Narrow Side Bulging of Slab and Improvement Measures

重钢3#连铸机浇300 mm厚16Mn系钢时窄面出现高达7～8 mm的鼓肚,分析发现浇注过程中存在结晶器窄面冷却强度弱、窄面锥度太小、窄面足辊跑锥等问题。通过对窄面足辊结构、结晶器锥度设定、窄面足辊与窄面铜板对弧、窄面足辊二冷水等参数进行优化,保证整个结晶器工作正常。实践表明,改进后结晶器最大跑锥0.5 mm,铸坯窄面鼓肚小于2 mm。

Bulging of 7 - 8 mm appeared at the narrow side during casting 300 mm thick 16Mn slabs with 3# caster of Chongqing Iron and steel Company. Problems during casting were identified, such as weak cooling intensity of mold especially at narrow side, too small taper at the narrow side and taper change of narrow side foot miler. After optimizing the structure of narrow side foot roller, taper of mold, alignment of copper plate and narrow side foot roller and secondary cooling of narrow side foot roller, the mold was brought to normal operation. Operating practice indicated that the greatest taper change of the improved mold was merely 0.5 mm and bulging at narrow side smaller than 2mm.