热轧中厚板超快速冷却过程温度场数值模拟

doi:10.13228/j.boyuan.issn0449-749x.20190396

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Abstract The ultra-rapid cooling process is the core technology for the production of hot-rolled steel sheets,which is of great significance for improving the structure of the plate products and improving the performance of the products. In the ultra-rapid cooling process of medium-thick steel plates,the difference in cooling speed between the core and the surface causes the steel plate to form an internal and external temperature difference in the thickness direction,but the heat transfer mechanism of the steel plate surface in the ultra-rapid cooling is complicated. Therefore,all of them increase the difficulty of defining the cooling mechanism of the plate. In order to improve the calculation accuracy of the ultra-fast cooling model of medium and heavy plates and improve its heat exchange system,this article establishes a mathematical model for the inverse method of equivalent heat transfer coefficient in the ultra-rapid cooling process of medium-thick steel plates after rolling. The model relies on the discrete analytical method,the thermal differential equation and the state characteristics of the normal phase of the object. The model transforms the obtained transcendental equation root into the equivalent heat transfer coefficient,and the result is used as the boundary condition of the ultra-fast cold temperature field model. On this basis, a super-fast cooling temperature field simulation model was constructed to verify the temperature field under the ultra-fast cooling mechanism of 20 mm steel plates. The results showed that the mathematical model of the inverse heat transfer coefficient inverse method could be applied to the ultra-fast cooling process of medium-thick steel plates.

Key words： hot rolled steel plate ultra-fast cooling equivalent heat transfer coefficient inverse method

Received: 26 August 2019

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	Articles by authors
	SUN Ming-han
	ZHENG Yi
	QU Chun-tao
	JIN Shi-zhe
	XU Zhi-qiang
	DU Feng-shan

Cite this article:

SUN Ming-han,ZHENG Yi,QU Chun-tao等. Numerical simulation of temperature field in ultra-fast cooling process of hot rolled plate[J]. Iron and Steel, 2020, 55(3): 50-57.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20190396 OR http://www.chinamet.cn/Jweb_gt/EN/Y2020/V55/I3/50

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