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<p>This study focuses on optimizing hot rolling processes to enhance Charpy V-notch (CVN) impact toughness in naval-grade high-strength low-alloy steel. Two industrial trials were conducted by JSW Steel Ltd., involving slabs cast into plates of 20 and 14&#xa0;mm thicknesses. Initial trials (P1–P3) revealed inconsistent CVN toughness due to elevated finishing temperatures, partial recrystallization, and heterogeneous grain structures. Microstructural analysis via Microsim-PM software identified coarse grains (22–28&#xa0;µm for 20&#xa0;mm plates; 16.6&#xa0;µm for 14&#xa0;mm) as a primary factor for reduced toughness. A second trial (P4–P6) adjusted process parameters, notably lowering finishing temperatures to ~ 825&#xa0;°C, reducing rolling speeds, and optimizing pass schedules. These modifications yielded refined grain sizes (2–3&#xa0;µm smaller), reduced heterogeneity, and significantly improved CVN values (nearly double the first trial) while maintaining required tensile strength. The findings underscore the critical role of controlled rolling temperatures and strain accumulation in achieving uniform microstructures and enhanced toughness for naval applications.</p>

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Tailoring Rolling Parameters to Enhance CVN Toughness in Naval-Grade HSLA Steel

  • 期刊论文

  • 发表日期：

    2025年7月27日

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  • Subhnit Kumar Roy,
  • R. K. Ragasree,
  • Vivek Kumar Yadav,
  • Pradeep Agarwal,
  • Rajesh Goyal

摘要

This study focuses on optimizing hot rolling processes to enhance Charpy V-notch (CVN) impact toughness in naval-grade high-strength low-alloy steel. Two industrial trials were conducted by JSW Steel Ltd., involving slabs cast into plates of 20 and 14 mm thicknesses. Initial trials (P1–P3) revealed inconsistent CVN toughness due to elevated finishing temperatures, partial recrystallization, and heterogeneous grain structures. Microstructural analysis via Microsim-PM software identified coarse grains (22–28 µm for 20 mm plates; 16.6 µm for 14 mm) as a primary factor for reduced toughness. A second trial (P4–P6) adjusted process parameters, notably lowering finishing temperatures to ~ 825 °C, reducing rolling speeds, and optimizing pass schedules. These modifications yielded refined grain sizes (2–3 µm smaller), reduced heterogeneity, and significantly improved CVN values (nearly double the first trial) while maintaining required tensile strength. The findings underscore the critical role of controlled rolling temperatures and strain accumulation in achieving uniform microstructures and enhanced toughness for naval applications.