Bao Xuejun,Jiang Dongbin,Liu Zhaoxia,et al.Numerical Simulation of 80 mm Extra-thick Plate Stacking Slow Cooling for EH420 Marine Steel[J].Special Steel,2025,46(05):72-79.
Extra-thick plates of marine steel are widely used in marine engineering and are produced by microalloying and heat treatment process. The extra-thick plate needs to be slowly cooled at 380
o
C - 420
o
C to control the transformation form the austenite to acicular ferrite and bainite, which can obtain excellent mechanical properties. A mathematical model is established for the stacking process of 80 mm
extra- thick plates of EH420 marine steel, and the accuracy of the model was verified by actual temperature measurement. The influence of stacking parameters on the residence time of extra-thick plates of marine steel in the transformation zone is studied.It is found that the temperature of the surface layer of plate stacking gradually decreases, while the decrease rate of temperature in the middle and bottom of the stacking are significantly lower. The stacking rate has little effect on the cooling rate, while the initial temperature of the plate has a great impact on the cooling rate. With the initial temperature of the extra-thick plates stacking increasing from 400
o
C to 500
o
C, the residence time of the stacking center in the phase transformation zone decreases from 35.6 h to 15.1 h. As the height of extra-thick plates stacking increases, the time required for cooling time rises. When the stacking height increases from 2.0 m to 3.0 m, the residence time in the structure transformation zone in the middle of the stacking increases from 17.1 h to 20.8 h, which is caused by the decrease of the stacking surface and the cooling rate.
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