According to different manufacturing processes, high-speed steel can be divided into high-speed steel melting and powder metallurgy high-speed steel.
① smelting high-speed steel: ordinary high-speed steel and high-speed steel are produced by melting method. After smelting, casting and rolling process, they are made into knives. Smelting high-speed steel prone to serious problems is carbide segregation, hard and brittle carbide distribution in high-speed steel uneven and coarse grains (up to tens of microns), high-speed steel cutting tool wear resistance, toughness And cutting performance adversely affected.
② PM HSS: PM HSS is a high-frequency induction furnace melting molten steel, with high-pressure argon or pure nitrogen gas atomization, and then quenched to obtain a fine uniform crystals Organization (high-speed steel powder), and then the resulting powder under high temperature and pressure pressed into blanks, or first made of billet and then forged, rolled into a cutter shape. Compared with the high speed steel made by the melting method, the advantages of PM HSS are: small and uniform carbide grains, strength and toughness, wear resistance compared to smelting high-speed steel have improved a lot. In the field of complex CNC tool PM HSS tool will further develop and play an important role. Typical grades, such as F15, FR71, GF1, GF2, GF3, PT1, PVN, etc., can be used to make large tools that can withstand heavy loads and high impact. They can also be used to make precision tools.