Evolution behavior of oxide inclusions in Si-Mn deoxidized steel during billet heating process
J. Min. Metall. Sect. B-Metall., 61 (1) (2025) 111-124. DOI:10.2298/JMMB250109009N
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Available online 19 jun 2025
(Received 09 January 2025; Accepted 14 June 2025)
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In order to minimize the impact of oxide inclusions on the quality of Si-Mn deoxidized steel, the effects of heat treatment temperature and holding time on the inclusion composition and morphology were studied. LX82A billets were heated isothermally at 1000, 1100, and 1200°C for 8, 10, and 12 hours, respectively. The experimental results show that as the heat treatment temperature increases, calcium treatment and the reduction of the w(Al2O3 + MgO) / w(SiO2 + MnO) ratio enhance the deformability of the oxide inclusions. This causes a gradual transition in inclusion shape from oval to round. At 1200°C, the oxide inclusions are predominantly regular and round. With increasing heat treatment temperature and holding time, the oxide inclusions in Si-Mn deoxidized steel shift from the CaO-SiO2-Al2O3 system to the MnO-SiO2-Al2O3 system. At a constant temperature, the highest inclusion transformation rate and the most uniform composition occur at a 10-hour holding time. At 1200°C, an alternative calcium treatment and the steel matrix-inclusion interface reaction increase the MnO content at the interface, reducing the manganese content in the steel and forming a Mn-depleted zone. This decreases austenite stability, enhances ferrite nucleation, and improves the steel quality and performance. Therefore, controlling the heat treatment temperature around 1200°C is crucial.
Keywords: Si-Mn deoxidized steel; Oxide inclusion; Heat treatment; Temperature; Holding time; Composition changes
Correspondence Address:
J.-L. Li,
Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan, Hubei, China; Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steelmaking, Wuhan University of Science and Technology, Wuhan, Hubei, China;
email: jli@wust.edu.cn
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