以冷作模具钢ＣｒＷＭｎ为例，采用４种不同预处理方法，对比它们的碳化物粒子尺寸、分布、钢的奥氏体晶粒大小及强韧性。试验证明，采用循环退火完全能够代替常用的等温球化退火工艺，并可缩短生产周期１／３，节省能耗近一半。如果先进行高温固溶处理或再加上几次循环淬火，再经退火后可获得高度弥散、０．２～０．４μｍ的碳化物，使最终热处理的实际晶粒度达１２～１３级，改善了模具钢的强韧性和耐磨性，从而延长其使用寿命 Using cold-working die steel CrWMn as an example, four different pretreatment methods were used to compare their carbide particle size, distribution, austenite grain size and toughness. Experiments show that the use of cyclic annealing can completely replace the commonly used isothermal ball annealing process, and can shorten the production cycle 1/3, saving nearly half the energy consumption. If the first high-temperature solution treatment or coupled with several cycles of quenching, and then by annealing to obtain highly dispersed, 0.2 ~ 0.4μm carbide, the final heat treatment of the actual grain size of 12 to 13, Die steel to improve the toughness and wear resistance, thereby extending its service life