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Microstructures and properties of 550 MPa grade high strength thin-walled H-beam steel

  • Metallic materials
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Abstract

The microstructures and mechanical properties of 550 MPa grade lightweight high strength thin-walled H-beam steel were experimentally studied. The experimental results show that the microstructure of the air-cooled H-beam steel sample is consisted of ferrite, pearlite and a small amount of granular bainites as well as fine and dispersive V(C,N) precipitates. The microstructure of the water-cooled steel sample is consisted of ferrite and bainite as well as a small amount of fine pearlites. The microstructure of the water-cooled sample is finer than that of the air-cooled sample with the average intercept size of the surface grains reaching to 3.5 μm. The finish rolling temperature of the thin-walled high strength H-beam steel is in the range of 750 °C–850 °C. The lower the finish rolling temperature and the faster the cooling rate, the finer the ferrite grains, the volume fraction of bainite is increased through water cooling process. Grain refinement strengthening and precipitation strengthening are used as major strengthening means to develop 550 MPa grade lightweight high strength thinwalled H-beam steel. Vanadium partially soluted in the matrix and contributes to the solution strengthening. The 550 MPa grade high-strength thin-walled H-beam steel could be developed by direct air cooling after hot rolling to fully meet the requirements of the target properties.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Key Lab of Metals and Processing of Anhui Province, Anhui University of Technology, Ma’anshan, 243002, China

    Jiping Chen  (陈继平), Jianqing Qian & Shengzhi Li

  2. School of Materials Science and Engineering, State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China

    Yonglin Kang

  3. Ma’anshan Iron and Steel Co. Ltd, Ma’anshan, 243005, China

    Haifan Qian

Authors
  1. Jiping Chen  (陈继平)
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  2. Yonglin Kang
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  3. Jianqing Qian
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  4. Shengzhi Li
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  5. Haifan Qian
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Corresponding author

Correspondence to Jiping Chen  (陈继平).

Additional information

Funded by the “11th Five” National Science and Technology Support Project (No. 2006BAE03A13)

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Chen, J., Kang, Y., Qian, J. et al. Microstructures and properties of 550 MPa grade high strength thin-walled H-beam steel. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 28, 1217–1222 (2013). https://doi.org/10.1007/s11595-013-0848-5

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  • DOI: https://doi.org/10.1007/s11595-013-0848-5

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