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首页> 外文期刊>Journal of thermal stresses >ESTIMATION OF THERMAL STRESSES IN HOT-ROLLED STEEL COILS DURING NATURAL AIR COOLING
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ESTIMATION OF THERMAL STRESSES IN HOT-ROLLED STEEL COILS DURING NATURAL AIR COOLING

机译：自然空气冷却过程中热轧钢卷的热应力估算

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摘要

Hot-rolled steel coils are stored upon manufacturing to cool to about 50℃. High temperatures of coiling cause thermal stresses during the cooling stage that result in spot welding between strip layers of coil. Under these conditions, surface defects or strip ruptures may occur during uncoiling. This paper will initially introduce the heat transfer model in the coil based on stress-dependent thermal conductivity in the radial direction of the coil. The two approaches of "solid body" and "thin-walled, concentric cylinders" for thermal stress analysis will then be used to compute the thermal compressive stresses in the coil. Comparison of the results obtained from these two approaches in the mathematical model reveals that the solid body approach overestimates the thermal stresses when compared to the thin-walled concentric cylinders approach, the inequality rising with reduced strip thickness. This difference, however, is found to have no considerable impact on predicting coil temperature.
机译：生产时将热轧钢卷存储到50℃左右。卷取的高温会在冷却阶段产生热应力，从而导致在卷带层之间进行点焊。在这些条件下，开卷过程中可能会发生表面缺陷或带材断裂。本文首先将基于线圈径向上与应力相关的导热系数，介绍线圈中的热传递模型。然后将使用“固体”和“薄壁同心圆柱”这两种方法进行热应力分析，以计算线圈中的热压应力。从数学模型中这两种方法获得的结果的比较表明，与薄壁同心圆柱体方法相比，固体方法高估了热应力，不等式随着带钢厚度的减小而增加。然而，发现该差异对预测线圈温度没有显着影响。

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