Analysis of inclusions in the whole process of 20MnCr5 gear steel

Bai Xuxu; Zhang Min; Zeng Jianhua; Yang Shufeng; Li Jingshe

doi:10.7513/j.issn.1004-7638.2022.06.021

Volume 43 Issue 6

Jan. 2023

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Bai Xuxu, Zhang Min, Zeng Jianhua, Yang Shufeng, Li Jingshe. Analysis of inclusions in the whole process of 20MnCr5 gear steel[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(6): 143-148. doi: 10.7513/j.issn.1004-7638.2022.06.021

Citation:

Bai Xuxu, Zhang Min, Zeng Jianhua, Yang Shufeng, Li Jingshe. Analysis of inclusions in the whole process of 20MnCr5 gear steel[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(6): 143-148. doi: 10.7513/j.issn.1004-7638.2022.06.021

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Analysis of inclusions in the whole process of 20MnCr5 gear steel

doi: 10.7513/j.issn.1004-7638.2022.06.021

1.
State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Pangang Group Research Institute Co., Ltd., Panzhihua 617000, Sichuan , China
2.
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 10083, China

Received Date: 2021-08-20
Publish Date: 2023-01-13

Abstract

Abstract

In order to effectively improve the cleanliness of gear steel and product quality, it is necessary to clarify the evolution behavior of non-metallic inclusions in the smelting process of gear steel. This paper takes 20MnCr5 gear steel as the research object. Through sampling and analysis of the whole LF-VD-CC gear steel production process, a scanning electron microscope is used to systematically analyze the characteristics of inclusion composition, morphology, size, and quantity at different stages of the smelting process. When LF enters the station, the primary inclusions are Al₂O₃-MnS composite inclusions, among which many MnS inclusions are distributed. After 20 minutes of refining, Al₂O₃-MgO-MnS composite and Al₂O₃ inclusions were observed. At the end of LF, the product is unchanged. After VD breaking, the primary inclusions observed are MnS inclusions, which are nearly spherical and consist of MnS inclusions with Al₂O₃ as the core. There are many magnesia-aluminum spinels, some of which have a small amount of CaO, and some have a small amount of MnS. However, the main component is the magnesia-aluminum spinel.
- gear steel,
- non-metallic inclusion,
- composition,
- morphology,
- whole process analysis

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References(16)

References

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