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MorphologyMorphologies, spatial distribution, and elemental distribution of both “void” defects in slabs and banded structureBanded structure defects in hot-rolled coils were characterized. The results suggest that “void” defects\"Void\" defects appear at the center of the slab thickness, with the most severe instances at the 1/4 width position, resembling the distribution of coarse banded structuresBanded structure in hot-rolled coils. The significant segregationSegregation of C, Mn, and Nb appears in both “void” and coarse banded structuresBanded structure. A clear correlation between the two phenomena is indicated by the statistical analysis of industrial production. The banded structureBanded structure can be indirectly assessed through the observation of the size and quantity of void in slabs, which can be combined with metallographic statistics for a more accurate evaluation of product quality. Furthermore, banded structuresBanded structure can be diminished by addressing the “void” defects in slabs. In summary, this paper presents a novel method to evaluate and control the banded structuresBanded structure.

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Study on Banded Segregation of High-Strength Hot-Rolled Grade Steel and the “Void” Defect in Casting Slabs

  • 会议论文

  • 发表日期：

    2025年

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  • Fei-fei Yang,
  • Zhan-peng Yin,
  • Yan-zhao Luo,
  • Xin Li,
  • Guo-biao Di

摘要

MorphologyMorphologies, spatial distribution, and elemental distribution of both “void” defects in slabs and banded structureBanded structure defects in hot-rolled coils were characterized. The results suggest that “void” defects\"Void\" defects appear at the center of the slab thickness, with the most severe instances at the 1/4 width position, resembling the distribution of coarse banded structuresBanded structure in hot-rolled coils. The significant segregationSegregation of C, Mn, and Nb appears in both “void” and coarse banded structuresBanded structure. A clear correlation between the two phenomena is indicated by the statistical analysis of industrial production. The banded structureBanded structure can be indirectly assessed through the observation of the size and quantity of void in slabs, which can be combined with metallographic statistics for a more accurate evaluation of product quality. Furthermore, banded structuresBanded structure can be diminished by addressing the “void” defects in slabs. In summary, this paper presents a novel method to evaluate and control the banded structuresBanded structure.