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Precipitation behavior of MnS on oxide inclusions in Si/Mn deoxidized steel

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Abstract

The precipitation behavior of the MnS phase of MnO-SiO2 oxides in Si/Mn deoxidized steels was examined. MnS phase formation in the oxide phase was clearly identified, and the Mn content in both phases increased with isothermal holding at 1,200°C. With increased cooling rate, both the size of inclusions and the precipitation ratio of the MnS phase in the oxides decreased. More than 90% of MnO-SiO2 oxides contain MnS phases and MnS precipitation is accompanied by an Mn-depleted zone around the oxides. This zone was created not just around the MnS, but around the whole oxide inclusion. One can tentatively conclude that the majority of the MnS islands after isothermal holding are formed by the diffusion of Mn and S from the matrix into the inclusions.

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Authors and Affiliations

  1. Department of Materials Science and Metallurgical Engineering, Pohang University of Science and Technology, San 31 Hyoja-dong, 790-784, Nam-ku, Pohang, Korea

    Han S. Kim & Hae-Geon Lee

  2. Technical Research Laboratories, Pohang Iron & Steel Co. Ltd., P.O. Box 36, 790-785, Nam-ku, Pohang, Korea

    Kyung-Shik OH

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  1. Han S. Kim
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  2. Hae-Geon Lee
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  3. Kyung-Shik OH
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Kim, H.S., Lee, HG. & OH, KS. Precipitation behavior of MnS on oxide inclusions in Si/Mn deoxidized steel. Metals and Materials 6, 305–310 (2000). https://doi.org/10.1007/BF03028076

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