重型机械Issue(3)：38-42,5.
基于二冷区凝固冷却的连铸大方坯表面裂纹控制研究
Research on surface crack control of continuous casting billets based on solidification cooling in the secondary cooling zone
摘要
Abstract
Severe surface cracks were observed on continuous casting blooms produced at a steel plant.Distinct decarburized layers on both sides of the cracks indicated that the cracks formed during the continuous casting process.The ductility temperature range of this steel grade was determined to be 985～1 290℃ via Gleeble high-temperature tensile testing.Fracture surface morphologies within this range exhibited numerous dimples of varying depths,characteristic of ductile fracture.Based on these findings,an optimization scheme for secondary cooling water distribution was proposed.The scheme included increasing the water flow rates in the second and third cooling zones to 1.3 times their original values,controlling the straightening point temperature within the ductility range of 985～1290℃,andlimitingthetemperaturereboundineachzoneto≤100℃/m.Industrial trial results demonstrated that after optimization,surface cracks on the blooms were essentially eliminated,and the first-pass yield for the surface inspection of the rolled products increased from78.2％to85.6％.关键词
连铸大方坯/表面裂纹/塑性区间/二冷配水优化/裂纹控制Key words
continuous casting bloom/surface crack/plasticity interval/secondary cooling water distribution optimization/crack control分类
矿业与冶金引用本文复制引用
杜肖臣,李新强,王文学,姚成功,孙宇秋,高朝辉..基于二冷区凝固冷却的连铸大方坯表面裂纹控制研究[J].重型机械,2026,(3):38-42,5.基金项目
国机重型机械装备集团股份有限公司青年科技基金项目(QNJJ-2024-09) （QNJJ-2024-09）
