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Improvement of Castability and Surface Quality of Continuously Cast TWIP Slabs by Molten Mold Flux Feeding Technology

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Abstract

An innovative continuous casting process named POCAST (POSCO’s advanced CASting Technology) was developed based on molten mold flux feeding technology to improve both the productivity and the surface quality of cast slabs. In this process, molten mold flux is fed into the casting mold to enhance the thermal insulation of the meniscus and, hence, the lubrication between the solidifying steel shell and the copper mold. Enhancement of both the castability and the surface quality of high-aluminum advanced high-strength steel (AHSS) slabs is one of the most important advantages when the new process has been applied into the commercial continuous casting process. A trial cast of TWIP steel has been carried out using a 10-ton scale pilot caster and 100-ton scale and 250-ton scale commercial casters. The amount of mold flux consumption was more than 0.2 kg/m2 in the new process, which is much larger than that in the conventional powder casting. Trial TWIP castings at both the pilot and the plant caster showed stable mold performances such as mold heat transfer. Also, cast slabs showed periodic/sound oscillation marks and little defects. The successful casting of TWIP steel has been attributed to the following characteristics of POCAST: dilution of the reactant by increasing the slag pool depth, enlargement of channel for slag film infiltration at meniscus by elimination of the slag bear, and decrease of apparent viscosity of the mold slag at meniscus by increasing the slag temperature.

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Acknowledgments

This work was carried out as an internal research project of POSCO Ltd. The authors sincerely thank POSCO for permission to publish this work.

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Authors and Affiliations

  1. Technical Research Laboratories of POSCO, Pohang, 37895, Republic of Korea

    Jung-Wook Cho (Principal Researcher, Associate Professor)

  2. Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea

    Jung-Wook Cho (Principal Researcher, Associate Professor), Shin Yoo (Senior Researcher), Min-Seok Park (Principal Researcher), Joong-Kil Park (Senior Principal Researcher) & Ki-Hyeon Moon (Senior Principal Researcher)

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  1. Jung-Wook Cho
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  2. Shin Yoo
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  3. Min-Seok Park
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  4. Joong-Kil Park
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  5. Ki-Hyeon Moon
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Corresponding authors

Correspondence to Jung-Wook Cho or Joong-Kil Park.

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Manuscript submitted July 25, 2016.

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Cho, JW., Yoo, S., Park, MS. et al. Improvement of Castability and Surface Quality of Continuously Cast TWIP Slabs by Molten Mold Flux Feeding Technology. Metall Mater Trans B 48, 187–196 (2017). https://doi.org/10.1007/s11663-016-0818-3

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  • DOI: https://doi.org/10.1007/s11663-016-0818-3

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