Analysis of the oxygen content and inclusions in 443 ultra-pure ferritic stainless steel

Abstract

Abstract:

Samples taken from the end of AOD, the end of the VOD, LF after calcium treatment, LF alloying by Nb-Ti and tundish of the AOD-VOD-LF-tundish process during 443 ultra pure ferritic stainless steel were investigated to analyze the total oxygen and to characterize the inclusions type and morphology. The results show that the variation law for total oxygen is in good agreement with the equilibrium oxygen content. The total oxygen content and the equilibrium oxygen content decrease throughout the process. The types of inclusions change at different stages. The inclusion in AOD are mainly CaO-SiO₂-Al₂O₃-MgO and Al₂O₃. The inclusion in VOD are mainly Al₂O₃and CaO-Al₂O₃-MgO-SiO₂.The inclusion type are mainly CaO-Al₂O₃-MgO-SiO₂after calcium treatment in LF. The inclusion in tundish are mainly CaO-Al₂O₃-MgO-TiO₂,while in LF after alloying by Nb-Ti. Evolution process for the inclusions in the 443 stainless steel are proposed based on the inclusions type.

Key words:

443 ultra-pure , ferritc stainless steel, the equilibrium oxygen content, the total oxygen, inclusion, origin, ion-molecule coexistence theory

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[4]	. Composition evolution of inclusions in 316L stainless steel refining process [J]. Steelmaking, 2021, 37(2): 16-22.
[5]	. Study on inclusion controlling of thin gauge high strength steel by CSP process [J]. Steelmaking, 2021, 37(2): 51-57.
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Analysis of the oxygen content and inclusions in 443 ultra-pure ferritic stainless steel

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