一、前言六十年代末七十年代初,我国在钨钼系优良高速钢品种W6Mo5Cr4V2的基础上,增碳加铝而获得了不含Co超硬型高速钢W6Mo5Cr4V2A1。这种钢经正常处理后,硬度可达HRC67～69,红硬性较高,可磨性较好,也有较好的韧性。用它创造的刀具较之W18Cr4V可提高寿命2～4倍,在模具上应用也可望取得好成绩。它的价格与通用高速钢W18Cr4V及W6Mo5Cr4V2相 I. Introduction In the late 1960s and early 1970s, based on W6Mo5Cr4V2, an excellent high-speed steel of tungsten and molybdenum type, China obtained W6Mo5Cr4V2A1, a non-Co superhard high-speed steel by adding carbon and aluminum. After the normal treatment of this steel, the hardness of up to HRC67 ~ 69, red hardness higher grindability better, but also better toughness. Use it to create the tool compared to W18Cr4V can increase life expectancy 2 to 4 times, the application of the mold is also expected to achieve good results. Its price and general high-speed steel W18Cr4V and W6Mo5Cr4V2 phase