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<p>In the production of Si-containing welding wire steel, the key procedures can influence the oxidation behaviors, and subsequent descaling performances of steel billets and wire rods significantly. In this study, based on the evolution of the oxide scales during isothermal heat treatment at 1000-1150&#xa0;°C, it was concluded that oxidation kinetics exhibited a linear correlation with the designed duration. The outer oxide layer consists mainly of dense Fe<sub>3</sub>O<sub>4</sub>, while the inner layer consists loose oxides (FeO + Fe<sub>3</sub>O<sub>4</sub> + Fe<sub>2</sub>SiO<sub>4</sub>). Continuously distributed spot-like oxides formed in the internal oxidation layer. With elevated oxidation temperature and extended holding time, the thickness of the Si-rich layer was evidently increased. In addition, the influence of designed finish rolling temperatures on oxidation behaviors was investigated at 850-900&#xa0;°C. It was found that Si enrichment occurs at the interface between oxide scale and substrate. Under air cooling, a higher finishing temperature (900&#xa0;°C) leads to thermal expansion, enhancing residual stresses and weakening scale adhesion, while under furnace cooling, a lower finishing temperature (850&#xa0;°C) minimizes the voids formed at the oxide scale-substrate interface, and thereafter reduces the descaling time. These conclusions offer guidelines for improving the descaling performance.</p>

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Effects of Key Production Parameters on Surface Oxidation Behaviors of Si-Containing Welding Wire Steel

  • 期刊论文

  • 发表日期：

    2026年1月26日

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  • Yue Wang,
  • Lisong Zhu,
  • Hongqiang Liu,
  • Li Sun,
  • Hongwei Cao,
  • Cheng Ma,
  • Yinbao Tian,
  • Lisong Zhou,
  • Jian Han,
  • Zhengyi Jiang

摘要

In the production of Si-containing welding wire steel, the key procedures can influence the oxidation behaviors, and subsequent descaling performances of steel billets and wire rods significantly. In this study, based on the evolution of the oxide scales during isothermal heat treatment at 1000-1150 °C, it was concluded that oxidation kinetics exhibited a linear correlation with the designed duration. The outer oxide layer consists mainly of dense Fe3O4, while the inner layer consists loose oxides (FeO + Fe3O4 + Fe2SiO4). Continuously distributed spot-like oxides formed in the internal oxidation layer. With elevated oxidation temperature and extended holding time, the thickness of the Si-rich layer was evidently increased. In addition, the influence of designed finish rolling temperatures on oxidation behaviors was investigated at 850-900 °C. It was found that Si enrichment occurs at the interface between oxide scale and substrate. Under air cooling, a higher finishing temperature (900 °C) leads to thermal expansion, enhancing residual stresses and weakening scale adhesion, while under furnace cooling, a lower finishing temperature (850 °C) minimizes the voids formed at the oxide scale-substrate interface, and thereafter reduces the descaling time. These conclusions offer guidelines for improving the descaling performance.