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<p>Surface defects are a&#xa0;critical indicator of semi-finished product quality, with the elements Cu and Sn exerting a&#xa0;significant influence through the phenomenon known as hot shortness. The present study quantifies the defect sensitivity caused by Cu and Sn for three different steel grades under continuous casting conditions using the In-situ Material Characterization by Bending (IMC-B) test. Building on this, purposefully pre-damaged samples were subjected to reheating under process-related conditions within a&#xa0;natural-gas combustion atmosphere. The objective is to investigate how surface defects from the casting process evolve depending on their initial depth and the selected final reheating temperature. Finally, metallographic analyses allow for a&#xa0;correlation between the initial defect depth and the surface morphology after reheating.</p>

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Process Chain Sensitivities in Green Steel Production: Tramp Element Impacts on Casting and Reheating

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月4日

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  • Georg Gaiser,
  • Robert Littringer,
  • Peter Presoly,
  • Christian Bernhard,
  • Sergiu Ilie

摘要

Surface defects are a critical indicator of semi-finished product quality, with the elements Cu and Sn exerting a significant influence through the phenomenon known as hot shortness. The present study quantifies the defect sensitivity caused by Cu and Sn for three different steel grades under continuous casting conditions using the In-situ Material Characterization by Bending (IMC-B) test. Building on this, purposefully pre-damaged samples were subjected to reheating under process-related conditions within a natural-gas combustion atmosphere. The objective is to investigate how surface defects from the casting process evolve depending on their initial depth and the selected final reheating temperature. Finally, metallographic analyses allow for a correlation between the initial defect depth and the surface morphology after reheating.