Analysis and Control of Transverse Crack on Surface of ER70-Ti Welding Wire Steel Billet
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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/m2。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/m2,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。Abstract: 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.
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Key words:
- continuous casting /
- billet /
- wire steel /
- ER70-Ti /
- transverse cracks /
- slag /
- melting speed
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