炼钢

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镁处理对钢中非金属夹杂物的控制效果

  

  1. (1.东北大学 材料与冶金学院,辽宁 沈阳 110004;2.山钢集团莱芜钢铁集团有限公司,山东 莱芜 271104)
  • 接受日期:1900-01-01 出版日期:2014-10-05

Control Performance of Nonmetallic Inclusion in Molten Steel using Mg-treatment

  • Accepted:1900-01-01 Online:2014-10-05

摘要: 以热力学计算为基础,在120 t钢包内进行了镁处理工业试验。结果表明采用缓释含镁包芯线技术可以实现镁合金的平稳喂入。钢中检测到w(T.Mg)=0.001 0 %~0.001 6 %。喂线过程中无钢水增氮趋势,T.O降低显著,降低幅度约50 %,钢水洁净度明显提高。镁处理后,SPHC钢中夹杂物由氧化铝转变为镁铝尖晶石或纯的氧化镁,尺寸从3~5 μm降至1~2 μm,夹杂物中镁含量与镁合金喂入量呈较好的对应关系。

关键词: 镁处理, 铝镇静钢, 夹杂物, 洁净度

Abstract: On the basis of thermodynamic calculations, Mg-treatment experiments were carried out in 120 t ladle. The results showed that the slow-release cored wires containing magnesium can be injected smoothly into molten steel. Total magnesium mass fraction in molten steel was measured in the range of 0.001 0 %-0.001 6 %. During the process, nitrogen pick-up was not found. However total oxygen mass fraction was decreased 50 %, also cleanliness of steel was improved. After Mg-treatment, inclusions in SPHC changed from Al2O3 to spinel or pure MgO, and the size decreased from 3-5 μm to 1-2 μm. The magnesium mass fraction in inclusions presented a good correspondence with addition of magnesium alloy.

Key words: Mg-treatment, Al-killed steel, inclusion, cleanliness