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Metallurgical and Materials Transactions B

, Volume 49, Issue 5, pp 2533–2549 | Cite as

Three-Dimensional Distribution of Hooks in Al-Killed Low-Carbon Continuous Casting Steel Slabs

  • Xubin Zhang
  • Qiangqiang Wang
  • Wen Yang
  • Shengdong Wang
  • Lifeng Zhang
Article

Abstract

In the current study, steel samples were etched and hooks on several successive layers of longitudinal and transverse slab sections were obtained to investigate the three-dimensional (3-D) distribution of hooks in low-carbon continuous casting slabs. The data from industrial trials and numerical calculation were used to explain the variation in the distribution and morphology of hooks. Around the slab perimeter, the mean depth of hooks at the center and edge of the wide face and the edge of the narrow face was larger than that of other locations. The 3-D hook demonstrated a varied characteristic on different layers, as the observed surface changed in the longitudinal direction. By several layers of the transverse section being polished off, hooks in the transverse direction below the slab surface were obtained, in which the truncated hook and the joint hook between the wide face and narrow face were observed at the slab corner. The same oscillation mark could show as hook type and depression type, depending on the occurrence of the overflow between the solidified meniscus and the copper plate. Industrial trials and the numerical calculation illustrated that the transient variation of hooks in the 3-D space was related to the level fluctuation of molten steel in the mold and temperature fluctuation with casting time and the fluid flow and temperature near the meniscus. Finally, the influence area and volume of hooks on the capture of inclusions and bubbles were discussed.

Notes

Acknowledgments

The authors are grateful for the support from the National Key R&D Program of China (2017YFB0304000 and 2017YFB0304001), National Natural Science Foundation of China (Grant No. 51725402), National Postdoctoral Program for Innovative Talents (Grant No. BX201700028), Young Elite Scientists Sponsorship Program by CAST (No. 2017QNRC001), China Postdoctoral Science Foundation (No. 2017M620016), and High Quality Steel Consortium (HQSC), University of Science and Technology Beijing (USTB), China.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2018

Authors and Affiliations

  1. 1.School of Metallurgical and Ecological EngineeringUniversity of Science and Technology Beijing (USTB)BeijingChina
  2. 2.College of Materials Science and EngineeringChongqing UniversityChongqingChina

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