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Effect of the Bloom-Heating Process on the Inclusion Size of Si-Killed Spring Steel Wire Rod

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Abstract

For some Si-killed steel grades, it is desirable to obtain calcium or manganese silico-aluminate inclusions with low-melting temperatures, which form a glassy phase at low temperatures and are easily elongated and reduced in size during hot rolling. However, these inclusions sometimes exhibit coarse crystallization changes during heat treatment before hot rolling, which affects the rheological properties of inclusions. In the present work, the composition, morphology, and size of inclusions in Si-killed spring steel by two types of bloom-heating processes were investigated. It was found that most oxide inclusions in the billet were glassy and had good rolling deformability when a 1523 K × 150 minutes bloom-heating process was adopted. However, when a heating process of 1373 K × 40 minutes was adopted, the oxide inclusions had a high proportion of crystallization, and most of them had poor rolling deformability. Due to the influence of different crystallization ratios and crystal sizes of inclusions, the maximum inclusion sizes of the corresponding wire rods were 20 and 35 μm, respectively. On the basis of these results, it was suggested that to improve the inclusion control of Si-killed spring steel, the heating temperature and time before blooming should be selected in the high-temperature region above the nose temperature of the inclusion TTT transformation curve.

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(adapted from Ref. [22])

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (No. 51974210), the Hubei Provincial Natural Science Foundation (No. 2019CFB697), and the State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology.

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On behalf of all authors, the corresponding author states that there is no conflict of interest.

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Authors and Affiliations

  1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, P.R. China

    Yaoqing Meng, Jianli Li & Hangyu Zhu

  2. Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan, 430081, P.R. China

    Jianli Li & Hangyu Zhu

  3. Technology Center of Zenith Steel Group Co., Ltd., Changzhou, 213000, P.R. China

    Kunpeng Wang

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  1. Yaoqing Meng
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  2. Jianli Li
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Correspondence to Jianli Li or Hangyu Zhu.

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Meng, Y., Li, J., Wang, K. et al. Effect of the Bloom-Heating Process on the Inclusion Size of Si-Killed Spring Steel Wire Rod. Metall Mater Trans B 53, 2647–2656 (2022). https://doi.org/10.1007/s11663-022-02557-8

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