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The precipitation and effect of nano nitrides in HSLC steel

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Abstract

The existing forms of N and Al in HSLC (high strength low carbon) steel produced by TSCR (thin slab casting and rolling process), the precipitation thermodynamics and kinetics of AlN, and its effects on structure and mechanical property are studied. The experimental results show that only a small quantity of nitrogen is combined into AlN in HSLC steel produced by TSCR and most of the nitrogen in steel is still free nitrogen. Aluminum-nitride is mainly precipitated during the period of slow air cooling after coiling, but not during rolling and water cooling. The acid-soluble aluminum has no obvious effect on the grain size and mechanical property of HSLC steel produced by TSCR whose acid-soluble aluminum content is 0.005%–0.043%. The precipitation of AlN is not the main cause of grain refinement of HSLC steel produced by TSCR, nor is AlN the dominating precipitate that has precipitation strengthening effect. The nano nitrides are not pure AlN, but have complex compositions.

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Authors and Affiliations

  1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Jie Fu, YangChun Liu & HuaJie Wu

  2. Shougang Technology Research Institute, Shougang (Group) Corporation, Beijing, 100041, China

    YangChun Liu

  3. Metallurgical Engineering Research Institute, University of Science and Technology Beijing, Beijing, 100083, China

    HuaJie Wu

Authors
  1. Jie Fu
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  2. YangChun Liu
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  3. HuaJie Wu
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Corresponding author

Correspondence to Jie Fu.

Additional information

Supported by the National Natural Science Foundation of China (Grant No. 50334010) and the State Foundation for Key Projects: New Generation of Steels (Grant No. G1998061500)

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Fu, J., Liu, Y. & Wu, H. The precipitation and effect of nano nitrides in HSLC steel. Sci. China Ser. E-Technol. Sci. 51, 989–998 (2008). https://doi.org/10.1007/s11431-008-0059-z

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  • DOI: https://doi.org/10.1007/s11431-008-0059-z

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