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Strength of Materials

, Volume 50, Issue 1, pp 176–183 | Cite as

Study on the Cracking Mechanism of YQ450NQR1 High-Strength Weathering Steel

  • J. S. Qing
  • X. D. Duan
  • M. F. Xiao
  • J. Q. Li
  • M. Liu
  • Q. Liu
  • H. F. Shen
Article

YQ450NQR1 high-strength weathering steel is prone to cracking. The cracking patterns and morphology were detected by metallographic and scanning electron microscopies. The decarburized layer around the cracks is indicative of their origination in the continuous casting bloom. Then, the controlling factors were established by analyzing the carbon content of molten steel, residual elements in the alloy, purity and performance of the mold powder, and secondary cooling water flow of the mold. Results show that the process optimization reduced the cracking reject ratio from 3.5 to 0.78%.

Keywords

high-strength weathering steel cracking decarburization layer 

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • J. S. Qing
    • 1
  • X. D. Duan
    • 2
  • M. F. Xiao
    • 2
  • J. Q. Li
    • 2
  • M. Liu
    • 2
  • Q. Liu
    • 3
  • H. F. Shen
    • 1
  1. 1.Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, School of Materials Science and EngineeringTsinghua UniversityBeijingChina
  2. 2.Pansteel Group Co. Ltd.PanzhihuaChina
  3. 3.State Key Laboratory of Advanced MetallurgyUniversity of Science and TechnologyBeijingChina

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