Q420C连铸方坯表面开裂分析  

Analysis of Surface Cracking of Q420C Continuous Casting Square Billet

作　　者：艾星辉[1] 宋海武[2] 李秀华[1] 张丽颖[1] 

机构地区：[1]唐山科技职业技术学院冶金系,河北唐山063001 [2]唐山钢铁集团有限责任公司技术中心,河北唐山063016

出　　处：《热加工工艺》2017年第9期245-247,256,共4页Hot Working Technology

摘　　要：Q420C方坯连铸时出现了严重的表面开裂现象,轧后表现为角钢的边部开裂。本文应用Gleeble3500热/力模拟试验机研究了该钢的高温塑性。分析表明,Q420C钢在连铸时的严重开裂,除与材料本身具有的极强裂纹敏感性有关外,还与二冷区的冷却强度过大以及喷嘴位置配置得不合理有关。避免或减轻Q420C钢在连铸生产时开裂的改进措施是采用柔和的冷却策略。Serious surface cracking occurs in the continuous casting of Q420C square billet. After rolling, the angle steel has edge cracking. The high temperature plasticity of the steel was studied by using Gleeble3500 thermal and mechanical simulator. The results show that the serious cracking of Q420C billet in continuous casting is related to the strong crack sensitivity of the material, too high cooling intensity of the secondary cooling zone and unreasonable nozzle position. The measures to avoid or reduce the cracking of Q420C steel in continuous casting production are application of soft cooling strategy.

关 键 词：连铸 高温塑性 Q420C 表面开裂 弯曲矫直塑性 

分 类 号：TG111.91[金属学及工艺—物理冶金]