RH精炼工艺对无取向硅钢MgO·Al2O3夹杂物演变影响及控制

doi:10.13228/j.boyuan.issn0449-749x.20140091

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摘要基于BOF→RH→CSP生产工艺，研究了RH精炼过程钢中夹杂物类型演变及MgO?Al2O3夹杂物形成规律，同时对MgO?Al2O3夹杂物的形成条件进行了热力学计算，借助CFD数值模拟软件研究了RH精炼过程卷渣行为。研究发现，RH精炼过程20和30 min时，[w([MgO])/w([Al2O3])]为0.005～0.020，未发现MgO?Al2O3夹杂物；RH出站后夹杂物[w([MgO])/w([Al2O3])]为0.3～0.5，且RH精炼结束后MgO?Al2O3夹杂物占夹杂物总量的58.4%；另外，RH精炼过程钢液表面速度CFD模拟结果为0.57 m/s，大于临界卷渣速度0.45 m/s，且顶渣成分与夹杂物成分相近，存在卷渣现象。热力学计算表明，钢液与炉渣平衡时钢中[w([Al])]为0.31%～0.37%，[w([Mg])]为0.000 24%～0.000 28%，在MgO?Al2O3生成区域之内。减少RH处理过程卷渣，浇铸过程下渣及控制顶渣和包衬相中MgO质量分数可抑制MgO?Al2O3夹杂物形成。

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	曾亚南
	孙彦辉
	蔡开科
	徐蕊

关键词 ：镁铝尖晶石, 无取向硅钢, 热力学, Al脱氧, 卷渣

Abstract：Based on the practical production of non-oriented silicon steel, the evolution of inclusion type and the formation of MgO?Al2O3 inclusion were analyzed in the process of BOF→RH→CSP. The thermodynamic conditions for forming MgO?Al2O3 inclusion were discussed and the behavior of slag entrapment of molten steel was also simulated by CFD software during RH refining. The results showed that the value of [w([MgO])/w([Al2O3])] was in the range of 0.005?0.020 and no MgO?Al2O3 inclusion was observed at 20 and 30 min in RH refining; on the contrary, the value of [w([MgO])/w([Al2O3])] was in the range of 0.3?0.5 and the MgO?Al2O3 inclusion accounts for 58.5% of total amount of inclusions after RH refining. The compositions of slag were similar to the composition of inclusions; furthermore, the simulation results of CFD software show that the surface velocity was 0.57 m/s, which was greater than the critical velocity of 0.45 m/s. When the test steel was in equilibrium with slag, the [w([Mg])] was 0.000 24%?0.000 28% and [w([Al])] was 0.31%?0.37%, which was in theoretically calculated MgO?Al2O3 formation zone, thereby leading to formation of MgO?Al2O3 inclusion in steel. Thus, the MgO?Al2O3 inclusion was inhibited by reducing the quantity of slag entrapment and roughing slag in casting and controlling composition of slag and the MgO content in the ladle refractory.

收稿日期: 2014-02-21 出版日期: 2014-09-10

引用本文:

曾亚南，孙彦辉，蔡开科，徐蕊. RH精炼工艺对无取向硅钢MgO·Al2O3夹杂物演变影响及控制[J]. 钢铁, 2014, 49(9): 38-43. ZENG Ya-nan, SUN Yan-hui, CAI Kai-ke, XU Rui. Effect of RH Refining on Evolution and Control of MgO·Al2O3 Inclusion in Non-Oriented Silicon Steel. Iron and Steel, 2014, 49(9): 38-43.

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