Issue |
Metall. Res. Technol.
Volume 118, Number 2, 2021
|
|
---|---|---|
Article Number | 220 | |
Number of page(s) | 8 | |
DOI | https://doi.org/10.1051/metal/2021022 | |
Published online | 09 April 2021 |
Regular Article
Effect of rare earth on inclusion evolution in industrial production of HRB500E steel
College of Materials Science and Engineering, Taiyuan University of Technology,
Taiyuan
030024, PR China
* e-mail: shebinwang@163.com
Received:
4
December
2020
Accepted:
12
March
2021
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 µm and isolated strip MnS inclusion with the size of ≥ 2 µm. With RE treatment, Al2O3-MnO-CaO inclusions are transformed into spherical or ellipsoidal REAlO3 and REAlO3-MnS. The size of such inclusions is ≈ 1.5 µm 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.
Key words: rare earth / HRB500E steel / inclusions / thermodynamic / evolution mechanism
© EDP Sciences, 2021
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