AISI 431不锈钢生产过程夹杂物转变机理

doi:10.13228/j.boyuan.issn0449-749x.20220798

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Abstract Large-sized inclusions formed in steelmaking and mold casting have a significant effect on the metallurgical quality of steel. Stainless steel AISI 431 produced by a domestic steel plant has severe defects,and these defects were found to be large-sized oxide inclusions after microscopic analysis. In order to investigate the source of large-sized inclusions in AISI 431 stainless steel bars, the inclusion evolution mechanism during production was investigated in this study based on full process sampling analysis. OTSInca inclusion analysis system and commercial thermodynamic software FactSage 8.2 were employed to investigate and analyze inclusions in every production process. It was found that the inclusions at the end of AOD were mainly CaO-SiO₂-Al₂O₃ complex inclusions with high SiO₂ content,which transformed to spinel and calcium aluminate after Al deoxidation at the beginning of LF. After the casting process,the decrease of dissolved Al concentration in steel is very obvious,and new large-sized Al₂O₃ and Na- and K-containing SiO₂-based complex inclusions can be detected in steel. Al₂O₃ originated from a new aluminum-oxygen reaction in the molten steel after contact with air,and Na- and K-containing SiO₂-based complex inclusions is from the entrapment of mold flux. During the subsequent process,the maximum size of both types of inclusions further increased. Al₂O₃was elongated as long lines along the rolling direction,while the Na- and K-containing SiO₂-based complex inclusions were deformed and broken. Analysis of the defects in AISI 431 stainless steel bars further verified that these two types of large size inclusions can directly lead to bar defects. Finally,this study proposes to consider process optimization in terms of reducing the exposure time of the steel flow,controlling the intensity of the gas supply during casting,the design of the casting mold flow field and the control of LF soft blowing argon.

Key words： stainless steel thermodynamic inclusion secondary oxidation spinel

Received: 25 December 2022

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	WANG Ju
	LI Yang
	JIANG Zhouhua
	SUN Meng
	MAO Yunqie
	MA Shuai

Cite this article:

WANG Ju,LI Yang,JIANG Zhouhua等. Inclusion transformation mechanism of AISI 431 stainless steel during production[J]. Iron and Steel, 2023, 58(7): 54-63.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20220798 OR http://www.chinamet.cn/Jweb_gt/EN/Y2023/V58/I7/54

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