前言新高速钢和钢结硬质合金,是我国七十年代初开始使用的工模具材料。新高速钢(含V_3以上者称新高速钢,含V_2铝的称铝高速钢,含V_1的称普通高速钢)多数是硬而韧;WC-钢结硬质合金是硬而粘。这些新材料使用性能优良,加工比较困难。根据部局指示,我们所近年 Foreword The new high-speed steel and steel bonded carbide, China’s early 70s began to use mold material. New high-speed steel (including V_3 above said new high-speed steel, with V_2 aluminum called aluminum high-speed steel, V_1 containing ordinary high-speed steel) are mostly hard and tough; WC-steel hard alloy is hard and sticky. These new materials use excellent performance, processing more difficult. According to the ministry’s instructions, we are in recent years