论文部分内容阅读
用扫描电镜(SEM/EDS)分析了高钛焊丝钢连铸水口结瘤物和钢液中夹杂物的形貌和组成,结果表明:结瘤物的主要组成是Ti Ox和凝钢;精炼结束后钢液中的夹杂物主要是Mn O-Al2O3-Si O2-Ti Ox、Mg O-Al2O3-Ti Ox和Ti Ox类夹杂物;钢液中大量的高熔点含钛夹杂物是导致水口结瘤的主要原因。对钢液中的Al-Ti-O平衡和钢渣间的平衡进行了热力学计算,结果表明:当w([Al])/w([Ti])<0.15时,氧优先与钛结合,反之优先与铝结合;当钢包渣中的w((Fe O))<0.05%、w((Si O2))<15%时,可避免钛被炉渣氧化。通过对冶炼工艺参数和操作过程的优化,钢液中Ti Ox的质量分数从0.002 4%降低到0.001 0%以下,钢液的可浇性得到明显改善。
The morphology and composition of inclusions in the continuous casting nozzle and the liquid steel of the high titanium wire were analyzed by scanning electron microscopy (SEM / EDS). The results show that the main components of the nodules are Ti Ox and steelmaking; The inclusions in the liquid steel are mainly inclusions of Mn O-Al2O3-Si O2-Ti Ox, Mg O-Al2O3-Ti Ox and Ti Ox. A large amount of high-melting titanium-containing inclusions in the molten steel cause nodules The main reason. Thermodynamic calculations of the balance of Al-Ti-O in the molten steel and steel slag show that oxygen preferentially binds with titanium when w ([Al]) / w ([Ti] With aluminum; when the w ((FeO)) in the ladle slag is less than 0.05% and w (Si O2) is less than 15%, the titanium can be prevented from being oxidized by the slag. Through the optimization of smelting process parameters and operation process, the mass fraction of Ti Ox in the molten steel decreased from 0.002 4% to below 0.001 0%, the pourability of the molten steel was significantly improved.