1. State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,Liaoning,China,2. School of Mechanical Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,Shanxi,China ? 3. Shougang Qian��an Iron and Steel Co.,Ltd.,Qian��an 064404,Hebei,China
Hot Rolled Strip Re-reddening Temperature Changing Law during Ultra-fast Cooling
1. State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,Liaoning,China,2. School of Mechanical Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,Shanxi,China ? 3. Shougang Qian��an Iron and Steel Co.,Ltd.,Qian��an 064404,Hebei,China
ժҪ Temperature deviation between surface and the center of hot rolled strip is formed during ultra-fast cooling (UFC). Sur-face temperature will rise when temperature deviation goes up to an extent,and strip re-reddening phenomenon will appear. Strip re-reddening affects the stability of strip microstructure,property and temperature control precision. Thus,it is necessary to conduct research on re-reddening temperature changing law to improve strip property and temperature control precision. Strip tempera-ture trends for various strip thicknesses and ultra-fast cooling rates were obtained by numerical calculation method. Re-reddening temperature,temperature deviation between surface and center,and boundary layer position changing law were obtained. By com-parison,some conclusions were obtained: UFC re-reddening temperature and laminar cooling (LC) re-reddening temperature were linear to ultra-fast cooling rate respectively. Ultra-fast cooling rate affected UFC re-reddening temperature greatly,but it had little effect on LC re-reddening temperature. Equations which were used to calculate UFC re-reddening temperature,LC re-reddening temperature and maximum temperature deviation were obtained. The position of boundary layer stayed in 1/4 strip thickness.
Abstract��Temperature deviation between surface and the center of hot rolled strip is formed during ultra-fast cooling (UFC). Sur-face temperature will rise when temperature deviation goes up to an extent,and strip re-reddening phenomenon will appear. Strip re-reddening affects the stability of strip microstructure,property and temperature control precision. Thus,it is necessary to conduct research on re-reddening temperature changing law to improve strip property and temperature control precision. Strip tempera-ture trends for various strip thicknesses and ultra-fast cooling rates were obtained by numerical calculation method. Re-reddening temperature,temperature deviation between surface and center,and boundary layer position changing law were obtained. By com-parison,some conclusions were obtained: UFC re-reddening temperature and laminar cooling (LC) re-reddening temperature were linear to ultra-fast cooling rate respectively. Ultra-fast cooling rate affected UFC re-reddening temperature greatly,but it had little effect on LC re-reddening temperature. Equations which were used to calculate UFC re-reddening temperature,LC re-reddening temperature and maximum temperature deviation were obtained. The position of boundary layer stayed in 1/4 strip thickness.
��������:State ��1025�� science and technology support projects
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E-mail: neu2015@163.com
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Lian-yun JIANG,Chun-jiang ZHAO,Jian-hui SHI,Guo YUAN,Xue-qiang WANG,Qing-xue HUANG. Hot Rolled Strip Re-reddening Temperature Changing Law during Ultra-fast Cooling[J]. �й������ڿ���, 2015, 22(8): 694-702.
Lian-yun JIANG,Chun-jiang ZHAO,Jian-hui SHI,Guo YUAN,Xue-qiang WANG,Qing-xue HUANG. Hot Rolled Strip Re-reddening Temperature Changing Law during Ultra-fast Cooling. Chinese Journal of Iron and Steel, 2015, 22(8): 694-702.
2015, Vol. 22 
