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Effect of Oxides on Characteristics of MnS and Transverse Mechanical Properties in Commercial Al-Killed Non-Quenched and Tempered Steel

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Abstract

In this paper, the characteristics of tensile fractures and the typical inclusions in as-cast blooms and as-rolled bars are carefully investigated to figure out the causes of different transverse tensile properties in two commercial non-quenched and tempered steels. In low Ca bearing steel (3 ppm), MgO–Al2O3 (MA) + MnS are main inclusions and MA oxides express high ability for MnS heterogeneous nucleation. Consequently, the MnS inclusions in as-rolled bars are larger in size and smaller in number, the transverse ductility is satisfied due to the high space distance between the MnS inclusions. However, the transverse ductility of high Ca bearing steel (9 ppm) is much poor because MnS inclusions are agminated in distribution, causing severe stress concentration. The calculation results show that CaO in CaO–MgO–Al2O3 oxides (CMA) would react with Al and S in molten steels, suppressing the formation of MnS inclusions on surface of CMA oxides. An integrated illumination including the evolution processes of typical oxides in molten steels, the generation behaviors of MnS during the solidification, the deformation behaviors of sulfides and the relationship between sulfides and crack initiation have been conducted based on observation results and thermodynamic calculation.

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Acknowledgements

The authors are grateful for financial support provided by National Natural Science Foundation of China (Grant No. 51674024). The authors also appreciate the Xining Special Steel Co. Ltd. for the technical help. The comments from the anonymous reviewer are also greatly appreciated.

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Authors and Affiliations

  1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, 100083, People’s Republic of China

    Jinlong Lu & Guoguang Cheng

  2. Research and Development Department, Xining Special Steel Co., Ltd., 52 Chaidamu West Road, Xining, 810005, Qinghai, People’s Republic of China

    Julong Che, Liansheng Wang & Guojian Xiong

Authors
  1. Jinlong Lu
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  2. Guoguang Cheng
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  3. Julong Che
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  4. Liansheng Wang
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  5. Guojian Xiong
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Correspondence to Guoguang Cheng.

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Lu, J., Cheng, G., Che, J. et al. Effect of Oxides on Characteristics of MnS and Transverse Mechanical Properties in Commercial Al-Killed Non-Quenched and Tempered Steel. Met. Mater. Int. 25, 473–486 (2019). https://doi.org/10.1007/s12540-018-0191-7

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