高碳铬轴承钢全流程夹杂物演变机理及关键控制工艺

doi:10.13228/j.boyuan.issn1006-9356.20230584

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Abstract To study the evolution of inclusions in GCr15 bearing steel, the Aztec-Feature inclusion automatic software configured with Zeiss Ultra55 scanning electron microscope was used to statistically analyze samples in EAF-LF-RH-CC each process with over 200 mm² scanning area. The evolution of inclusion morphology, composition, quantity, size and distribution, etc. in each process was analyzed. The result indicates that, the main inclusions in GCr15 bearing steel are mainly Al₂O₃ in EAF exit. In the LF refining process, the main inclusions are MgO-Al₂O₃ and Al₂O₃-MgO-CaO with a little CaO. After RH start, the content of CaO in the inclusions increases, forming Al₂O₃-CaO-MgO inclusions. Finally, the average composition of inclusions in the tundish is 56Al₂O₃-22CaO-7MgO-8CaS. At the same time, the LF-RH refining stage and the early stage of RH soft blowing have significant removal effect on inclusions in steel, with removal rate of 95.6%. However, with the increase of RH soft blowing time, it has little effect on the removal of T[O] and [N] in the steel, and even large inclusions may be involved, leading to T[O] and average size of inclusions increase. According to the calculation of FactSage equilibrium thermodynamics, when w(T[O])=7×10^-6,w([Mg])≥0.4×10^-6 and w([Ca])≥0.16×10^-6 in GCr15 bearing steel liquid, magnesium aluminum spinel and solid calcium aluminate inclusions can be generated respectively. The research results provide theoretical guidance and reference to the production of bearing steel.

Key words： bearing steel inclusion evolution law aluminum oxide magnesium oxide

Received: 25 September 2023

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	LIU Hongbo
	LIU Ying
	XIE Rongyuan
	ZHANG Caidong
	CHE Xiaorui
	LI Min
	GAO Peng
	TIAN Zhiqiang
	ZHANG Jie

Cite this article:

LIU Hongbo,LIU Ying,XIE Rongyuan等. Evolution mechanism and key control processes of inclusions in high carbon chromium bearing steel during whole process[J]. China Metallurgy, 2024, 34(2): 117-125.

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http://www.zgyj.ac.cn/EN/10.13228/j.boyuan.issn1006-9356.20230584 OR http://www.zgyj.ac.cn/EN/Y2024/V34/I2/117

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