钙处理及保护浇铸工艺对钢液洁净度影响

摘要/Abstract

摘要：

通过对国内某钢厂采用BOF→LF→CC工艺生产的510L汽车大梁钢现场3炉试验取样，采用一系列方法分析全氧、氮、酸溶铝、镁、钙等元素含量的变化趋势，研究探讨了全流程过程夹杂物种类、数量、形貌等的演变规律。通过关闭中间包长水口、塞棒、上水口板间吹氩，并且使用岩棉封堵中间包包盖烘烤孔、塞棒孔和包盖缝隙等措施，可以经济有效的减少连铸过程由于吸气造成的二次氧化，使钢水吸氮质量分数从22×10^-6降至2×10^-6以内。采用钙处理工艺可以将以Al₂O₃-MgO为主的高熔点不变形夹杂物改性为低熔点的Al₂O₃-MgO-CaO复合夹杂物，但是需要严格控制钙处理操作工艺，操作不当会造成钢液二次氧化严重，夹杂物增多。经过钙处理后，铸坯中3~7 μm夹杂物数量增加，但是大于7 μm的大尺寸夹杂物减少。

关键词: 钢液洁净度, 夹杂物, 全氧, 钙处理

Abstract:

Steel and slag samples during refining and casting of three heats of 510L beam steel produced by BOF→LF→CC process was taken and analyzed. The variation of total oxygen (T.O), nitrogen and dissolved content of Al, Mg and Ca content in steel were investigated. The evolution of number density, composition and size of inclusions in steel at different steps was discussed. Reoxidation during continuous casting could be controlled economically and effectively by covering the top of tundish with cotton and stoping blowing argon from stopper rod, by which the nitrogen absorbtion from air reduced from 22×10^-6 to 2×10^-6. Calcium treatment was used to modify high-melting point Al₂O₃-MgO inclusions to Al₂O₃-MgO-CaO complex inclusions with low-melting temperature. However, proper operations during calcium treatment and during subsequent continuous casting were needed, otherwise, severe reoxidation occurred during continuous casting destroyed the effect of successful calcium treatment during steel refining during the industrial trials of the current study. After calcium treatment, 3—7 μm inclusions in slab increased while above 7 μm inclusions decreased.

Key words: steel cleanliness, inclusions, total oxygen, calcium treatment

李菲1，任强1，李雅翀1，潘东腾1，王新成1，2, 张立峰1. 钙处理及保护浇铸工艺对钢液洁净度影响[J]. 炼钢.

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钙处理及保护浇铸工艺对钢液洁净度影响

Influence of calcium treatment and protective castingon steel cleanliness during continuous casting process

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