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<p>To advance the engineering application of next-generation weathering steels for railway vehicles, this study systematically evaluated the corrosion behavior of Q450AWR5 and Q450NQR1 steels using multi-scale analytical methods. By integrating ten-year in-service corrosion data from actual vehicles with laboratory accelerated corrosion test results, a comprehensive assessment of the corrosion performance of these two steels was conducted. The results show that Q450AWR5 exhibits a significant comprehensive performance advantage, and its accelerated corrosion weight loss rate is about 10% lower than that of Q450NQR1. X-ray diffraction (XRD) analysis confirms that the proportion of α-FeOOH in the rust of Q450AWR5 is higher than that of Q450NQR1, and that the proportion of γ-FeOOH is lower than that of Q450NQR1. Under the synergistic effect of corrosion and wear, the average corrosion resistance of Q450AWR5 is ~2.5 times that of Q450NQR1. The average cross-sectional area of Q450AWR5 (516.6 μm²) is only 52.1% of that of Q450NQR1 (992.3 μm²), and the average depth of wear track of Q450AWR5 (0.63 μm) is only 30.1% of that of Q450NQR1 (2.09 μm) as shown by white light interference 3D reconstruction. This study provides key data to support the selection of weathering steels for severe service environments.</p>

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Comparative analysis of corrosion failure in Q450AWR5 and Q450NQR1 weathering steels under wet coal haulage conditions

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月10日

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  • Tao Cong,
  • Xueliang Shang,
  • Ruiqi Zhang,
  • Xuemin Wang

摘要

To advance the engineering application of next-generation weathering steels for railway vehicles, this study systematically evaluated the corrosion behavior of Q450AWR5 and Q450NQR1 steels using multi-scale analytical methods. By integrating ten-year in-service corrosion data from actual vehicles with laboratory accelerated corrosion test results, a comprehensive assessment of the corrosion performance of these two steels was conducted. The results show that Q450AWR5 exhibits a significant comprehensive performance advantage, and its accelerated corrosion weight loss rate is about 10% lower than that of Q450NQR1. X-ray diffraction (XRD) analysis confirms that the proportion of α-FeOOH in the rust of Q450AWR5 is higher than that of Q450NQR1, and that the proportion of γ-FeOOH is lower than that of Q450NQR1. Under the synergistic effect of corrosion and wear, the average corrosion resistance of Q450AWR5 is ~2.5 times that of Q450NQR1. The average cross-sectional area of Q450AWR5 (516.6 μm²) is only 52.1% of that of Q450NQR1 (992.3 μm²), and the average depth of wear track of Q450AWR5 (0.63 μm) is only 30.1% of that of Q450NQR1 (2.09 μm) as shown by white light interference 3D reconstruction. This study provides key data to support the selection of weathering steels for severe service environments.