Journal of Northeastern University Natural Science ›› 2018, Vol. 39 ›› Issue (11): 1582-1587.DOI: 10.12068/j.issn.1005-3026.2018.11.013

• Materials & Metallurgy • Previous Articles     Next Articles

Effect of Inter-Pass Cooling Process on Microstructure and Properties of Ultra-heavy Steel Plate

WU Jun-yu, WANG bin, WANG Bing-xing, WANG Zhao-dong   

  1. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China.
  • Received:2017-08-17 Revised:2017-08-17 Online:2018-11-15 Published:2018-11-09
  • Contact: WANG Bing-xing
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Abstract: By using a cooling device beside the laboratorial rolling mill, an inter-pass cooling(IPC) process was applied during rolling ultra-heavy steel plate. Here, the effect of the IPC process on microstructure and properties of the rolled plate was studied. The results showed that the steel plate has excellent strength and toughness after the IPC process. When the rolled plate is applied by a strong IPC process, the grain size is 10μm, the strength is 376MPa and the impact energy at -40℃ is 169J at the 1/4-thickness, while they become 15μm, 360MPa and 123J respectively at the 1/2-thickness. Meanwhile, a surface ultra-fine grain layer with the thickness of 470μm can be obtained and the average grain size is less than 5μm. The strength and toughness of the rolled plate are better in a strong IPC process than those in the inter-slab cooling process. When the intensity of the IPC process increases, the grain size decreases and the strength increases.

Key words: inter-pass cooling(IPC), temperature gradient rolling, ultra-heavy steel plate, grain refinement, deformation penetration, surface fine grain layer

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