Effect of rare earth on inclusion evolution in industrial production of HRB500E steel

被引：15

作者：

Kang, Jian ^{[1
]}

Yu, Yan-Chong ^{[1
]}

Zhang, Jin-Ling ^{[1
]}

Chen, Chao ^{[1
]}

Wang, She-Bin ^{[1
]}

机构：

[1] Taiyuan Univ Technol, Coll Mat Sci & Engn, Taiyuan 030024, Peoples R China

来源：

METALLURGICAL RESEARCH & TECHNOLOGY | 2021年 / 118卷 / 02期

基金：

中国博士后科学基金; 中国国家自然科学基金;

关键词：

rare earth; HRB500E steel; inclusions; thermodynamic; evolution mechanism;

D O I：

10.1051/metal/2021022

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The effect of rare earth (RE) on inclusion in HRB500E steel was studied based on plant trials. The results showed that S decreased by 47.6% after 0.0059% RE treatment. In samples without RE treatment, the inclusions change from Al2O3-MnO to ellipsoidal Al2O3-MnO-CaO complex inclusion, and the size of such inclusions is <= 2 mu m and isolated strip MnS inclusion with the size of >= 2 mu m. With RE treatment, Al2O3-MnO-CaO inclusions are transformed into spherical or ellipsoidal REAlO3 and REAlO3-MnS. The size of such inclusions is approximate to 1.5 mu m and single MnS inclusions were not found. The number density and size of inclusions changed significantly after RE treatment. Thermodynamic calculations show that the Gibbs free energy of RE inclusions is more negative and more stable. The transformation model of inclusions is established to illustrate the modification of inclusions during the smelting process.

引用

页数：8

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