21—4N具有较高的抗塑变能力和较好的高温韧性。锻压该材料R不加工气门所需的热锻模(以下简称模子)的要求(机械性能、几何尺寸、表面光洁度等)均比普通材料的气门模子要求更为严格。我厂自生产21—4N气门以来,一直存在模子寿命短的问题,影响正常的生产。今年以来,我们从改进模子的热处理工艺与改进热锻模结构方面着手,对模子使用寿命的提高作了初步探讨,并取得了一定的成效。 21-4N has a high resistance to plastic deformation and good high temperature toughness. Forging the material R Do not process the valve required hot forging die (hereinafter referred to as the mold) requirements (mechanical properties, geometry, surface finish, etc.) are more stringent than the average material of the valve mold requirements. I plant since the production of 21-4N valve has been the existence of short mold life problems, affecting the normal production. Since the beginning of this year, we have started with improving the mold heat treatment process and improving the hot forging die structure, and have made some achievements in improving the service life of the mold.