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根据模具的使用情况,对其表面和心部性能的要求不同,仅仅是整体热处理不能满足综合性能要求,改变成份也难以顾及全面。例如增加含碳量以提高耐磨性则势必牺牲韧性。采用表面强化处理则能达到既提高表面硬度(耐磨性等)又保持心部强韧的良好的综合性能。例如常用的3Gr-2W8V 热模钢,韧性好但热硬性和热强性不足。软氮化后表面硬度 HV900以上,大大提高了耐磨性和表面热强性而心部
According to the use of mold, the performance of the surface and the heart of the different requirements, just the overall heat treatment can not meet the overall performance requirements, change the composition is difficult to take into account the comprehensive. For example, increasing the carbon content to improve wear resistance is bound to sacrifice toughness. The use of surface strengthening treatment can achieve not only improve the surface hardness (wear resistance, etc.) and maintain the integrity of the heart tough performance. For example, the commonly used 3Gr-2W8V hot die steel, good toughness but lack of thermosetting and thermal strength. Soft nitriding after the surface hardness of HV900 or more, greatly improving the wear resistance and surface thermal strength and heart