Tool steel

Basic concepts: tool steel is used in the manufacture of cutting tools, measuring tool, mould and resistance to high temperature softening spring, all kinds of bearings and some steel wear parts, etc. Usually divided into carbon tool steel, alloy tool steel and high-speed tool steel. The characteristics of tool steel tool steel with good strength, toughness, hardness, wear resistance and tempering stability performance. Mainly used in the manufacture of all kinds of cutting tools, forming tools and measuring tools. ( 1) Hardness tool steel tool which has a high enough hardness after heat treatment, such as used for metal cutting tools generally above HRC60, the cutting tool in high speed machining hard materials produced by high temperature and heat conditions, can still maintain a high hardness and good red hardness. Carbon tool steel and alloy tool steel is in commonly 180 ℃ - 250 ℃, high-speed tool steel under the working temperature of 600 ℃ or so, still can maintain higher hardness. For thermal deformation of mould red hardness and high speed cutting tool steel is very important for performance. ( 2) Abrasion tool steel has good wear resistance, resistance to wear and tear. Tools under considerable pressure and friction conditions, can still maintain its shape and size remains the same. ( 3) Strength and toughness steel has a certain strength and toughness, make the tools in the work to withstand the load, shock, vibration and bending and other complex stress, to ensure the normal use of tools. ( 4) Other performance due to the various tools of different working conditions, tool steel also has other properties, such as mould steel should also have a certain high temperature mechanical properties, thermal fatigue, thermal conductivity and corrosion resistance, etc. Tool steel in addition to the above performance, but also should have good process performance. ( 1) Machining tool steel should have good thermal pressure processing performance and machining performance, to guarantee the manufacture and use tools. The processability of steel depends on chemical composition, organization and quality. ( 2) Quenching temperature range of tool steel quenching temperature range should be wide enough, in order to reduce the possibility of overheating. ( 3) Hardenability and hardenability steel hardenability is can achieve the highest hardness after quenching performance. Hardenability is mainly associated with the chemical composition, especially the carbon content of steel, the carbon content is higher, the higher the hardenability of the steel. Steel hardenability said from the table after quenching