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Optimizing RH refining process to maximize cleanliness of low-carbon low-silicon Al killed steel
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Zhao, Shuo, Wang, Bingshan, Zhu, Shibin, Song, Gaoyang, Wang, Shuai and Li, Zushu (2023) Optimizing RH refining process to maximize cleanliness of low-carbon low-silicon Al killed steel. Ironmaking & Steelmaking, 50 (5). pp. 451-460. doi:10.1080/03019233.2022.2122772 ISSN 0301-9233.
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Official URL: https://doi.org/10.1080/03019233.2022.2122772
Abstract
In the LD–RH–CC process for producing low-carbon low-silicon steel, the cleanliness level of the slab was studied by optimizing the compositions of the refining slag and oxygen blowing flow in trial heats through judicious control. In order to realize RH without oxygen blowing, the oxygen content of molten steel should reach 475–525 ppm before RH degassing to guarantee that the free oxygen is in the range of 100–150 ppm after the carbon–oxygen reaction. When the slag compositions were controlled to CaO = 41–50 wt-%, Al2O3 = 29–36 wt-%, SiO2 = 5–11 wt-% and MgO = 6–10 wt-% in the RH treatment without feeding calcium, the total oxygen content in the plate was 18 ppm, and the nitrogen content decreased to 17 ppm in the improved process. The micro-inclusions in the slab mainly consisted of MgO–Al2O3–(MnS) and Al2O3–(MnS), and the particle size was mainly concentrated below 3 μm. The average total amount of large electrolytic inclusions in the slab was 1.384 mg kg steel−1. The large inclusions were mainly SiO2, Al2O3, SiO2–Al2O3–(K2O), and MgO–Al2O3.
Item Type: | Journal Article | |||||||||||||||
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Subjects: | T Technology > TN Mining engineering. Metallurgy T Technology > TS Manufactures |
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | |||||||||||||||
Library of Congress Subject Headings (LCSH): | Precision casting, Steel -- Metallurgy -- Oxygen processes, Slag, Carbon steel, Steel, Structural | |||||||||||||||
Journal or Publication Title: | Ironmaking & Steelmaking | |||||||||||||||
Publisher: | Taylor & Francis | |||||||||||||||
ISSN: | 0301-9233 | |||||||||||||||
Official Date: | 2023 | |||||||||||||||
Dates: |
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Volume: | 50 | |||||||||||||||
Number: | 5 | |||||||||||||||
Page Range: | pp. 451-460 | |||||||||||||||
DOI: | 10.1080/03019233.2022.2122772 | |||||||||||||||
Status: | Peer Reviewed | |||||||||||||||
Publication Status: | Published | |||||||||||||||
Reuse Statement (publisher, data, author rights): | This is an Accepted Manuscript of an article published by Taylor & Francis in Ironmaking & Steelmaking on 04/10/2022, available online: http://www.tandfonline.com/10.1080/03019233.2022.2122772 | |||||||||||||||
Access rights to Published version: | Restricted or Subscription Access | |||||||||||||||
Date of first compliant deposit: | 5 September 2022 | |||||||||||||||
Date of first compliant Open Access: | 4 October 2023 | |||||||||||||||
RIOXX Funder/Project Grant: |
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