Zhu Liguang, Zhang Xiaoshi, Liu Zengxun, Wang Xingjuan, Po Zhanlong, Zhang Mingbo, Kang Aiyuan. Analysis and Control of Transverse Crack on Surface of ER70-Ti Welding Wire Steel Billet[J]. IRON STEEL VANADIUM TITANIUM, 2020, 41(3): 166-171. doi: 10.7513/j.issn.1004-7638.2020.03.029
Citation:
Zhu Liguang, Zhang Xiaoshi, Liu Zengxun, Wang Xingjuan, Po Zhanlong, Zhang Mingbo, Kang Aiyuan. Analysis and Control of Transverse Crack on Surface of ER70-Ti Welding Wire Steel Billet[J]. IRON STEEL VANADIUM TITANIUM, 2020, 41(3): 166-171. doi: 10.7513/j.issn.1004-7638.2020.03.029
Zhu Liguang, Zhang Xiaoshi, Liu Zengxun, Wang Xingjuan, Po Zhanlong, Zhang Mingbo, Kang Aiyuan. Analysis and Control of Transverse Crack on Surface of ER70-Ti Welding Wire Steel Billet[J]. IRON STEEL VANADIUM TITANIUM, 2020, 41(3): 166-171. doi: 10.7513/j.issn.1004-7638.2020.03.029
Citation:
Zhu Liguang, Zhang Xiaoshi, Liu Zengxun, Wang Xingjuan, Po Zhanlong, Zhang Mingbo, Kang Aiyuan. Analysis and Control of Transverse Crack on Surface of ER70-Ti Welding Wire Steel Billet[J]. IRON STEEL VANADIUM TITANIUM, 2020, 41(3): 166-171. doi: 10.7513/j.issn.1004-7638.2020.03.029
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/m2 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/m2,the speed is increased to 55 s as well.After adjusting the mold flux,U the surface quality of the billet is obviously improved.
DownLoad: