Abstract
Non-metallic inclusions with high melting points can easily be crack sources and reduce the service life of spring wire. Refining slag can adjust the composition and melting point of inclusion through the reaction with molten steel. Therefore, studying the optimization of refining slag systems and controlling the low melting point of inclusions have great significance. Before the optimization, the basicity (1.1–1.3) and Al2O3 content (>8%) of refining slag in VD (vacuum degassing) are high. By optimizing the composition of the slag, the basicity is controlled at 0.8–1.0, and the content of Al2O3 is less than 6%. After optimization, the results of the plant trials show that the content of dissolved Al in steel is less than 0.0020%, the inclusion ratio with a melting point less than 1400 ℃ increased from 8.33 to 25.58%, and the ratio with the melting point less than 1550 ℃ increased from 61.11 to 84.88%.
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© 2022 The Minerals, Metals & Materials Society
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Wang, C. et al. (2022). Optimization of VD Refining Slag and Control of Non-metallic Inclusions for 55SiCrA Spring Steel. In: Peng, Z., et al. 12th International Symposium on High-Temperature Metallurgical Processing. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-92388-4_40
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DOI: https://doi.org/10.1007/978-3-030-92388-4_40
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