低碳钢和超低碳钢连铸板坯皮下凝固钩的特征与控制研究  

Characteristic and control of hooks at the subsurface of low-carbon and ultra-low carbon steel continuous casting slab

作　　者：张旭彬 张立峰 ZHANG Xubin;ZHANG Lifeng(College of Materials Science and Engineering of Chongqing University,Chongqing 400044,China;State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao 066004,China)

机构地区：[1]重庆大学材料科学与工程学院,重庆400044 [2]燕山大学亚稳材料制备技术与科学国家重点实验室,河北秦皇岛066004

出　　处：《炼钢》2021年第2期1-9,共9页Steelmaking

摘　　要：以低碳钢和超低碳钢连铸板坯皮下的凝固钩结构为研究对象,呈现了凝固钩的典型特征形貌,发现了凝固钩捕获气泡和夹杂物的现象,得到了振痕与夹杂物的位置关系,通过试验和数值模拟的方法对比了不同浇铸参数对凝固钩深度的影响,并拟合得到了计算凝固钩深度的回归公式。结果表明:凝固钩主要存在完整叶状、弯曲型、双凝固钩型及熔断型等类型;凝固钩对大于20μm夹杂物的捕获能力更为显著;凝固钩的深度主要分布在距连铸坯表面3.0 mm以下,通过增大拉速、提高浇铸过热度、施加电磁制动、减小冷却水流量等措施,可以减小连铸坯皮下的凝固钩深度,从而改善连铸坯的表层质量。The hook structure at the subsurface of low carbon steel and ultra-low carbon steel continuous casting slab was studied,the typical morphology of hook was obtained.The entrapment of bubbles and inclusions by hooks was observed,and the location relationship between oscillation marks and inclusions was obtained.The influence of different casting parameters on hook depth was compared through the experimental method and numerical simulation,and the regression formula was fitted to calculate the hook depth.It was found that types of hooks included whole leaf-like type,bent type,double-hook type and truncated type.The entrapment tendency of over 20μm inclusions by hooks was larger.The depth of hooks was mainly below 3.0 mm from the surface of the continuous casting slab,and the increase of casting speed and casting superheat,the application of EMBr and the decrease of water flow rate in the mold could lead to the decrease of hook depth at the subsurface of continuous casting slab,which then improved the surface quality of the slab.

关 键 词：连铸板坯 超低碳钢 凝固钩 夹杂物 浇铸参数 

分 类 号：TF777.1[冶金工程—钢铁冶金]