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Study on formation of non-metallic inclusions with lower melting temperatures in extra low oxygen special steels

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Abstract

Investigations were made both in laboratorial and industrial scales on formation of non-metallic inclusions with relatively lower melting temperatures to improve the fatigue property of the special steels which contained extra low oxygen. It was found in laboratory studies that steel/slag reaction time largely affected non-metallic inclusions in steel. With the slag/steel reaction time increasing from 30 to 90 min, inclusions of MgO-Al2O3 spinel were gradually changed into CaO-MgO-Al2O3 system inclusions which were surrounded by lower melting temperature softer CaO-Al2O3 surface layers. By using high basicity and as much as 41 mass% Al2O3 refining slag, the ratio of the lower melting temperature CaO-MgO-Al2O3 system inclusions was remarkably increased to above 80%. In the industrial experiments, it was found that the inclusions changed in the order of “Al2O3→MgO-Al2O3 system→CaO-MgO-Al2O3 system” in the secondary refining, and the change from MgO-Al2O3 system to CaO-MgO-Al2O3 system took place from the outside to the inside. The diffusion of CaO and MgO inside the layer of CaO-MgO-Al2O3 was considered as the controlling step of the inclusion transfer. Through LF and RH refining, most inclusions could be transferred to lower melting temperature CaO-Al2O3 and CaO-MgO-Al2O3 system inclusions.

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Authors and Affiliations

  1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    XinHua Wang & Min Jiang

  2. Technical Research Institute, Shougang Corporation, Beijing, 100041, China

    Bing Chen & HaiBo Li

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  1. XinHua Wang
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  2. Min Jiang
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  3. Bing Chen
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  4. HaiBo Li
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Correspondence to XinHua Wang.

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Wang, X., Jiang, M., Chen, B. et al. Study on formation of non-metallic inclusions with lower melting temperatures in extra low oxygen special steels. Sci. China Technol. Sci. 55, 1863–1872 (2012). https://doi.org/10.1007/s11431-012-4874-x

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  • DOI: https://doi.org/10.1007/s11431-012-4874-x

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