ER70-Ti钢铸坯表面横向裂纹分析及控制  

Analysis and Control of Transverse Crack on Surface of ER70-Ti Welding Wire Steel Billet

作　　者：朱立光 张晓仕 刘增勋 王杏娟 朴占龙 张明博 康爱元 Zhu Liguang;Zhang Xiaoshi;Liu Zengxun;Wang Xingjuan;Piao Zhanlong;Zhang Mingbo;Kang Aiyuan(College of Metallurgy and Energy,North China University of Science and Technology,Tangshan 063210,Hebei,China;Hebei University of Science and Technology,Shijiazhuang 050000,Hebei,China;Hebei Iron and Steel Company Wire Division,Chengde 067000,Hebei,China)

机构地区：[1]华北理工大学冶金与能源学院,河北唐山063210 [2]河北科技大学,河北石家庄050000 [3]河钢集团承钢公司线材事业部,河北承德067000

出　　处：《钢铁钒钛》2020年第3期166-171,共6页Iron Steel Vanadium Titanium

基　　金：国家自然科学基金(51974133,51774141);河北省自然科学基金(E2019209543)。

摘　　要：承钢生产ER70-Ti焊丝钢小方坯过程中铸坯出现了严重的横向裂纹。利用FactSage热力学模拟软件对ER70-Ti钢的凝固特性进行分析,针对钢本身特性、保护渣和连铸工艺参数进行分析,研究横向裂纹缺陷产生的原因。利用全自动炉渣熔点熔速测定仪测得保护渣的熔速为145 s,利用旋转粘度计测试粘度为0.71 Pa·s,利用红外传热系统测试热流密度为184 kW/m^2。这种熔速慢、控制传热效果差的保护渣严重影响保护渣的渣层厚度和保护渣熔化的均匀性,通过改变保护渣的碱度、C含量以及配碳模式。将保护渣的热流密度降低到118 kW/m^2,熔速提高到55 s。实际生产表明调整后的保护渣使铸坯的表面质量明显改善。In the process of producing ER70-Ti titanium-containing welding wire steel billet in Chengde Iron and Steel Company,serious transverse cracks occurred in the slab.In order to find out the causes of lateral crack defects,the solidification characteristics of ER70-Ti steel were analyzed by FactSage thermodynamic simulation software,and the characteristics of steel itself,mold flux and continuous casting process parameters were analyzed.The measured melting rate of the mold flux is 145 s by using a fully automatic slag melting point melting rate tester.The measured viscosity is 0.71 Pa·s by using a rotational viscometer and the heat flux density is 184 kW/m^2 measured by an infrared heat transfer system.This kind of slag with slow melting rate and poor heat transfer control effect seriously affects the thickness of slag layer and the uniformity of slag melting.By changing the basicity,carbon content and carbon distribution mode of the mold flux,and the heat flux density of the mold flux is reduced to 118 kW/m^2,the speed is increased to 55 s as well.After adjusting the mold flux,U the surface quality of the billet is obviously improved.

关 键 词：连铸 小方坯 焊丝钢 ER70-Ti 横向裂纹 保护渣 熔速 

分 类 号：TF76[冶金工程—钢铁冶金]