Scholarlink

<p>Heavy rail steel grades were generally killed by Si–Ca–Ba alloys, <i>viz.</i> Si–Ca–Ba deoxidation process. In this study, a new deoxidation method using Si–Mn only (Si–Mn deoxidation process) was proposed. In order to compare these deoxidation methods, industrial experiments were carried out. The dissolved and total oxygen contents as well as the evolution of inclusions and the large-sized inclusions were investigated. The result showed that when the refining slag was similar, the dissolved oxygen activities of the two processes were quite close due to the steel-slag equilibrium, while the total oxygen contents of blooms in Si–Mn deoxidation process were even much lower. The evolution trend of inclusions during the refining process was similar as well, namely transforming from MnO–SiO<sub>2</sub>-based inclusions into CaO–SiO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub>–MgO-based inclusions. The evolution of inclusions in the Si–Ca–Ba deoxidation process was relatively quicker, thus MnO–SiO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub>–based inclusions were newly found in the Si–Mn deoxidation process. Compared to the Si–Ca–Ba deoxidation process, the Si–Mn deoxidation process resulted in smaller size of the micro-inclusions, lower total amount of macro-inclusions (especially for the globular BaO-containing inclusions) in blooms, and improved index of inclusions in the final rails. Besides, it resulted in not only a better steel cleanliness, but also a lower cost.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Effect of Deoxidation Method on Nonmetallic Inclusions in Heavy Rail Steel

  • 期刊论文

  • 发表日期：

    2026年2月11日

查看全文
  • Zhenzhuo Zhang,
  • Zhiyin Deng,
  • Zhigang Liang,
  • Miaoyong Zhu

摘要

Heavy rail steel grades were generally killed by Si–Ca–Ba alloys, viz. Si–Ca–Ba deoxidation process. In this study, a new deoxidation method using Si–Mn only (Si–Mn deoxidation process) was proposed. In order to compare these deoxidation methods, industrial experiments were carried out. The dissolved and total oxygen contents as well as the evolution of inclusions and the large-sized inclusions were investigated. The result showed that when the refining slag was similar, the dissolved oxygen activities of the two processes were quite close due to the steel-slag equilibrium, while the total oxygen contents of blooms in Si–Mn deoxidation process were even much lower. The evolution trend of inclusions during the refining process was similar as well, namely transforming from MnO–SiO2-based inclusions into CaO–SiO2–Al2O3–MgO-based inclusions. The evolution of inclusions in the Si–Ca–Ba deoxidation process was relatively quicker, thus MnO–SiO2–Al2O3–based inclusions were newly found in the Si–Mn deoxidation process. Compared to the Si–Ca–Ba deoxidation process, the Si–Mn deoxidation process resulted in smaller size of the micro-inclusions, lower total amount of macro-inclusions (especially for the globular BaO-containing inclusions) in blooms, and improved index of inclusions in the final rails. Besides, it resulted in not only a better steel cleanliness, but also a lower cost.