摘要
通过热力学计算及转炉、LF炉、中间包、铸坯、线材的系统取样与电镜等检测,对LD-LF-CC工艺生产的LX72A钢中夹杂物在各工序的种类、数量进行研究,并对T[O]、N含量随工序的变化情况进行检测。结果表明:随工艺的进行,夹杂物在转炉终点以Al2O3-Si O2-Mn O系为主,LF精炼后,夹杂物转变成熔点较低、易于上浮的球形Al2O3-Si O2-Ca O-Mg O系夹杂,线材中夹杂物演变为Al2O3-Si O2-Ca O-Mg O系。中间包和铸坯中夹杂物急剧减少,说明调碱度对夹杂物的变性有很好的作用。线材中wT[O]=25×10-6,w[N]=40×10-6,符合帘线钢生产要求。
By using the thermodynamic calculation,systematic sampling from BOF,LF,tundish,casting billets and the wire rod combined with SEM analysis,the type and amount of inclusions as well astotal oxygen content and the nitrogen content in LX72 A steel which produced by LD-LF-CC process have been investigated and measured at various production steps. The results show that the type of inclusions at the end of BOF is mainly Al2O3-Si O2-Mn O. After LF treatment,the inclusions translates into spherical Al2O3-Si O2-Ca O-Mg O particles which have a low melting point and easily floating up. At the stage of wire rod production the inclusions evolves into Al2O3-Si O2-Ca O-Mg O system. The amount of inclusions in tundish and casting billets decrease dramatically,indicating that changing basicity benefits to inclusions modification. The total oxygen content was 25 × 10^-6and the nitrogen content was 40 × 10^-6in the wire rod,which meets the requirements for steel cord.
出处
《钢铁钒钛》
CAS
北大核心
2015年第1期92-97,共6页
Iron Steel Vanadium Titanium
