Effects of Reoxidation of Liquid Steel and Slag Composition on the Chemistry Evolution of Inclusions During Electroslag Remelting

Journal Article · Wed Aug 15 04:00:00 EDT 2018 · Metallurgical and Materials Transactions B, Process Metallurgy and Materials Processing Science

DOI:https://doi.org/10.1007/S11663-018-1296-6· OSTI ID:22857879

Shi, Chengbin ^[1]; Wang, Hui ^[2]; Li, Jing ^[1]

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1. University of Science and Technology Beijing (USTB), State Key Laboratory of Advanced Metallurgy (China)
2. Shougang Research Institute of Technology (China)

Electroslag remelting (ESR) is increasingly used to produce some varieties of special steels and alloys, mainly because of its ability to provide extreme cleanliness and an excellent solidification structure simultaneously. In the present study, the combined effects of varying SiO{sub 2} contents in slag and reoxidation of liquid steel on the chemistry evolution of inclusions and the alloying element content in steel during ESR were investigated. The inclusions in the steel before ESR refining were found to be oxysulfides of patch-type (Ca,Mn)S adhering to a CaO-Al{sub 2}O{sub 3}-SiO{sub 2}-MgO inclusion. The oxide inclusions in both the liquid metal pool and remelted ingots are CaO-Al{sub 2}O{sub 3}-MgO and MgAl{sub 2}O{sub 4} together with CaO-Al{sub 2}O{sub 3}-SiO{sub 2}-MgO inclusions (slightly less than 30 pct of the total inclusions), which were confirmed to originate from the reduction of SiO{sub 2} from the original oxide inclusions by dissolved Al in liquid steel during ESR. CaO-Al{sub 2}O{sub 3}-MgO and MgAl{sub 2}O{sub 4} are newly formed inclusions resulting from the reactions taking place inside liquid steel in the liquid metal pool caused by reoxidation of liquid steel during ESR. Increasing the SiO{sub 2} content in slag not only considerably reduced aluminum pickup in parallel with silicon loss during ESR, but also suppressed the decrease in SiO{sub 2} content in oxide inclusions. (Ca,Mn)S inclusions were fully removed before liquid metal droplets collected in the liquid metal pool.

• OSTI ID: 22857879
• Journal Information: Metallurgical and Materials Transactions B, Process Metallurgy and Materials Processing Science, Journal Name: Metallurgical and Materials Transactions B, Process Metallurgy and Materials Processing Science Journal Issue: 4 Vol. 49; ISSN 1073-5615; ISSN MTBSEO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM
ALUMINIUM OXIDES
CALCIUM OXIDES
CALCIUM SULFIDES
CHEMISTRY
LIQUID METALS
MAGNESIUM OXIDES
MANGANESE SULFIDES
MELTING
OXYSULFIDES
REFINING
SILICON
SILICON OXIDES
SLAGS
SOLIDIFICATION
STEELS