M42 tool steel is high-speed steel with high cobalt. And it also is called JIS SKH59 and DIN 1.3247 steel. It is mainly used for high toughness precision, wear-resistant hardware, cold stamping die and cutting tools. It has high toughness and hardness could reach to 70HRC. Its hot hardness is high and easy to grind and cut. The cutting tools which are made of M42 steel can cut cast superalloys, titanium alloys, and ultra-high-strength steels. It is used widely to manufacture high precision and complex cutting tools because of its great grinding properties. M42 Steel round bar sheet plateproperties and chemical composition as below.