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<p>As “green, environmental protection and energy conservation” have emerged as the primary developmental focus of the iron and steel industry, the investigation of fluorine-free slag has become a pressing issue. This study presents a fluorine-free refining slag to address the issue of excessively utilizing fluorite in the production of 316 stainless steel. The effects of MgO content, alkalinity, calcium–aluminum ratio, and the activity of slag components on the metallurgical efficacy of the refining slag were examined, leading to the conclusion that the optimal composition of a fluorine-free slag should be MgO: 3–6 wt%, SiO<sub>2</sub>: 7–10 wt%, Al<sub>2</sub>O<sub>3</sub>: 30–37 wt%, and CaO 47–55 wt%. Industrial testing revealed that the test slag exhibited excellent fluidity, with a desulfurization rate comparable to that of the original slag, exceeding 90%. Comparison with the fluorinated slag, T.O and the density of inclusions of the fluorine-free slag were markedly diminished, with maximum reductions of 9&#xa0;ppm and 5.23 inclusions/mm<sup>2</sup>, and the number of inclusions over 10&#xa0;μm in size was markedly reduced, exceeding 50%. The test results showed that the fluorine-free slag&#xa0;markedly enhanced the cleanliness of liquid steel, which was crucial for augmenting the quality and performance of steel.</p>

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Design and metallurgical effect evaluation of fluorine-free refining slag for 316 stainless steel

  • 期刊论文

  • 发表日期：

    2025年11月1日

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  • Xian-hua Liu,
  • Fang Gao,
  • Chao Gu,
  • Cheng-yu Bi,
  • Li-yan Liu,
  • Yan-ping Bao

摘要

As “green, environmental protection and energy conservation” have emerged as the primary developmental focus of the iron and steel industry, the investigation of fluorine-free slag has become a pressing issue. This study presents a fluorine-free refining slag to address the issue of excessively utilizing fluorite in the production of 316 stainless steel. The effects of MgO content, alkalinity, calcium–aluminum ratio, and the activity of slag components on the metallurgical efficacy of the refining slag were examined, leading to the conclusion that the optimal composition of a fluorine-free slag should be MgO: 3–6 wt%, SiO2: 7–10 wt%, Al2O3: 30–37 wt%, and CaO 47–55 wt%. Industrial testing revealed that the test slag exhibited excellent fluidity, with a desulfurization rate comparable to that of the original slag, exceeding 90%. Comparison with the fluorinated slag, T.O and the density of inclusions of the fluorine-free slag were markedly diminished, with maximum reductions of 9 ppm and 5.23 inclusions/mm2, and the number of inclusions over 10 μm in size was markedly reduced, exceeding 50%. The test results showed that the fluorine-free slag markedly enhanced the cleanliness of liquid steel, which was crucial for augmenting the quality and performance of steel.