针对大型钢锭在第三类边界条件下的加热过程进行分析,利用加热时温度沿钢锭横截面的分布变化和由温度梯度导致的钢锭瞬时热应力计算方法,建立了加热过程中钢锭径向、横向和切向的瞬时应力模型。在瞬时应力模型的基础上,根据钢锭在某一温度下的屈服强度和加热炉温度值,提出了控制钢锭加热速度的计算式。用此计算式计算加热工艺参数,可以有效控制钢锭在加热过程的温升速度,避免钢锭在加热过程中产生裂纹,该计算方法已在某特殊钢锻造厂得到实际应用,生产实践证明该方法可行。 According to the analysis of heating process of large steel ingot under the third type of boundary conditions, the distribution of temperature along the cross section of steel ingot and the calculation method of instantaneous thermal stress of steel ingot caused by temperature gradient are established. The radial, transverse And tangential transient stress model. On the basis of the instantaneous stress model, according to the yield strength of the ingot at a certain temperature and the temperature of the reheating furnace, a formula for controlling the heating speed of the ingot is proposed. Calculating the heating process parameters by this formula can effectively control the temperature rising speed of the steel ingot during the heating process and avoid the ingot cracking during the heating process. The calculation method has been put into practical application in a special steel forging plant and the production practice has proved that the method is feasible .