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Volume 13 Issue 4
Aug.  2022
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JU Yinjun, LYU Ziyu, XING Lidong, WANG Min, BAO Yanping. Evolution analysis of inclusions in the whole process of 20CrMnTiH smelting[J]. Nonferrous Metals Science and Engineering, 2022, 13(4): 20-27. DOI: 10.13264/j.cnki.ysjskx.2022.04.003
Citation: JU Yinjun, LYU Ziyu, XING Lidong, WANG Min, BAO Yanping. Evolution analysis of inclusions in the whole process of 20CrMnTiH smelting[J]. Nonferrous Metals Science and Engineering, 2022, 13(4): 20-27. DOI: 10.13264/j.cnki.ysjskx.2022.04.003
shu

Evolution analysis of inclusions in the whole process of 20CrMnTiH smelting

  • 1.

    Hunan Valin Xiangtan Iron and Steel Co., Ltd., Xiangtan 411101, Hunan, China

  • 2.

    China State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China

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  • Received Date: October 10, 2021
  • Revised Date: November 22, 2021
  • Available Online: September 02, 2022
    Graphical Abstract
    • Abstract
  • To clarify the evolution behavior of nonmetallic inclusions in gear steel in the whole process, achieve effective control of the characteristics of inclusions in steel and improve product quality, 20CrMnTiH gear steel was taken as the research object. It was sampled in the "BOF-CAS-LF-VD-CC-rolling" smelting process, and SEM was used to systematically analyze and study the composition, size, morphology and quantity of its inclusions at different stages. The results showed that after the converter smelting and before the CAS refining, there were only Al2O3 inclusions in clusters in the steel. When the LF white slag was produced for 5 min, calcium wire was added for Ca treatment, which promoted the morphological change of the inclusions, forming Al2O3, Al2O3-CaO inclusions and Al2O3-MgO inclusions. When the LF exited the station, it had been combined into spherical Al2O3-MgO-CaO and CaS-MnS composite inclusions and TiN inclusions. When in the middle package position, in addition to spherical Al2O3-MgO-CaO composite inclusions and CaS inclusions, there were also fine and small-sized oxidized inclusions.
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