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Tribological analysis of oxide scales during cooling process of rolled microalloyed steel

Journal Article


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Abstract


  • The composition and phase transformation of oxide scale in cooling process (after hot rolling) of rolled microalloyed steels affect tribological features of rolled strip and downstream process, and the produced steel surface quality. In this study, physical simulation of surface roughness transfer during cooling process with consideration of ultra fast cooling (UFC) was carried out in Hille 100 experimental rolling mill, the obtained oxide scale was examined with SEM to show its surface and phase features. The results indicate that the surface roughness of the oxide scale increases as the final cooling (coiling) temperature increases, and the flow rate of the introduced air decreases. The cracking of the surface oxide scale can be improved when the cooling rate is 20 °C/s, the strip reduction is less than 12%, and the thickness of oxide scale is less than 15 μm, independent of the surface roughness. A cooling rate of more than 70 °C/s can increase the formation of retained wustite and primary magnetite precipitates other than the precipitation of α-iron. This study is helpful in optimising the cooling process after hot rolling of microalloyed steels to obtain quality surface products.

Authors


  •   Jiang, Zhengyi
  •   Yu, Xianglong (external author)
  •   Zhao, Jingwei
  •   Zhou, Cunlong (external author)
  •   Huang, Qingxue (external author)
  •   Luo, Guangzheng (external author)
  •   Linghu, Kezhi (external author)

Publication Date


  • 2014

Citation


  • Jiang, Z., Yu, X., Zhao, J., Zhou, C., Huang, Q., Luo, G. & Linghu, K. (2014). Tribological analysis of oxide scales during cooling process of rolled microalloyed steel. Advanced Materials Research, 1017 435-440.

Scopus Eid


  • 2-s2.0-84913587675

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=4325&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/3309

Number Of Pages


  • 5

Start Page


  • 435

End Page


  • 440

Volume


  • 1017

Abstract


  • The composition and phase transformation of oxide scale in cooling process (after hot rolling) of rolled microalloyed steels affect tribological features of rolled strip and downstream process, and the produced steel surface quality. In this study, physical simulation of surface roughness transfer during cooling process with consideration of ultra fast cooling (UFC) was carried out in Hille 100 experimental rolling mill, the obtained oxide scale was examined with SEM to show its surface and phase features. The results indicate that the surface roughness of the oxide scale increases as the final cooling (coiling) temperature increases, and the flow rate of the introduced air decreases. The cracking of the surface oxide scale can be improved when the cooling rate is 20 °C/s, the strip reduction is less than 12%, and the thickness of oxide scale is less than 15 μm, independent of the surface roughness. A cooling rate of more than 70 °C/s can increase the formation of retained wustite and primary magnetite precipitates other than the precipitation of α-iron. This study is helpful in optimising the cooling process after hot rolling of microalloyed steels to obtain quality surface products.

Authors


  •   Jiang, Zhengyi
  •   Yu, Xianglong (external author)
  •   Zhao, Jingwei
  •   Zhou, Cunlong (external author)
  •   Huang, Qingxue (external author)
  •   Luo, Guangzheng (external author)
  •   Linghu, Kezhi (external author)

Publication Date


  • 2014

Citation


  • Jiang, Z., Yu, X., Zhao, J., Zhou, C., Huang, Q., Luo, G. & Linghu, K. (2014). Tribological analysis of oxide scales during cooling process of rolled microalloyed steel. Advanced Materials Research, 1017 435-440.

Scopus Eid


  • 2-s2.0-84913587675

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=4325&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/3309

Number Of Pages


  • 5

Start Page


  • 435

End Page


  • 440

Volume


  • 1017