ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Review Article
Deformation of Non-metallic Inclusions in Steel during Rolling Process: A Review
Ying RenWen YangLifeng Zhang
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2022 Volume 62 Issue 11 Pages 2159-2171


Non-metallic inclusions were deformed and broken during hot and cold rolling processes. The deformation of inclusions during the rolling process had an influence on the property of steel products. Investigations on the deformation of inclusions in steel was reviewed in the current study. Physical properties of inclusions were summarized and compared, such as the melting temperature, viscosity, Young’s modulus, hardness, thermal expansion coefficient, crystallization, and Poisson’s ratio. The deformability index of inclusions showed a decreasing tendency with a higher rolling reduction. During the hot rolling process, the deformability index of oxide inclusions was mainly related to the melting temperature and viscosity of inclusions. With the increase of the rolling temperature, the deformability index of oxide inclusions showed an increasing tendency due to the higher liquid fraction and the lower viscosity of inclusions. During the hot rolling process, the deformability index of MnS inclusions increased with a decrease of the rolling temperature until reaching the austenite to ferrite matrix transformation temperature. During the cold rolling process, deformability index of oxide inclusions was mainly influenced by Young’s modulus and hardness of inclusions. Inclusions with a lower Young’s modulus exhibited a higher deformability index during the cold rolling process. Moreover, the focus on the inclusion deformation in the future was proposed in this paper.

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© 2022 The Iron and Steel Institute of Japan.

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