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VACUUM ›› 2025, Vol. 62 ›› Issue (2): 77-85.doi: 10.13385/j.cnki.vacuum.2025.02.12

• Vacuum Metallurgy and Thermal Engineering • Previous Articles     Next Articles

Effect of Micro-Deoxidizing Elements on the Inclusions in Q355B Steel

ZHANG Xiangjun1, LI Tianrui1,2, WU Wenping2, YANG Yong2, CHEN Zhiqiang1, XU Yong1, LU Yong1   

  1. 1. MCC Huatian Engineering & Technology Corporation, Nanjing 210019, China;
    2. School of Metallurgical Engineering, Anhui University of Technology, Ma'anshan 243000, China
  • Received:2024-08-02 Online:2025-03-25 Published:2025-03-24

Abstract: To explore the influence of different types and additive amounts of alloy elements on the morphology, composition, and distribution of inclusions in Q355B steel, different amounts of elements （Ti, Zr, Mg, and Ce） were added individually employing the method of vacuum induction melting. Spectral analyzer, scanning electron microscope, energy dispersive spectrometer, and image analyzer were used to observe and analyze the composition and morphological characteristics of typical inclusions in Q355B deoxidized steels. The results indicate that the addition of deoxidizing elements promotes the presence of MnS in Q355B steel in the form of composite inclusions. MnS+TiN/Ti-O/Al-Si-O, MnS+ZrO2, MnS+Al-Mg-O and MnS+Ce2O3 were formed in Ti-, Zr-, Mg- and Ce-deoxidized steels, respectively. Proper control of the amount （mass fraction）of deoxidizing elements can achieve better control of inclusions. Oxides of Ti or Ce have a better refinement effect on the size of MnS inclusions, while excessive amounts of Zr or Mg can lead to the aggregation of ZrO2 or the formation of MgO+SiO2+MnO composite inclusions, resulting in the formation of coarse inclusions. Additionally, the reasonable range of elemental addition for Q355B steel when using single deoxidizing elements is preliminarily determined. 0.010%Ti, 0.005 2%-0.008 8%Zr, 0.003 2%Mg, and 0.007 1%-0.008 8%Ce are more conducive to the stability of inclusion size as well as the microstructure refinement in Q355B steel.

Key words: Q355B, micro-alloy element, oxide metallurgy, microstructure, inclusion, VIM

CLC Number:  TF76

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