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Die steel was used in the manufacture of cold die, hot forging molding moldmold. The mould is the main processing tool manufacturing parts of machinery manufacturing, motor, electric instrument, radio and other industrial sectors in the. Mold quality directly affects the pressure processing technology, the precision of the product yield and quality of production cost, and the quality and service life of die except by reasonable structure design and machining precision, mainly affected by mould material and heat treatment.
Die steel can be broadly divided into: cold die steel, hot die steel and plastic mould steel three class, used for forging, stamping, cutting type, die castingetc.. Because of various kinds of mold for different purposes, the workcondition is complex, so the mold steel, mold manufacturing according to theirworking conditions, should have the strength, hardness, high wear resistance,enough toughness, and high hardenability, hardenability and other process performance. Because this kind of different purposes, the complex working conditions, so the die steel performance requirements are also different.
Cold mould comprises a die, drawing die, drawing die, stamping die, thread rolling die, thread rolling plate, Leng Dunmo and cold extrusion die etc.. Mold steel cold work, according to the manufacture working conditions, have high hardness, strength, wear resistance and enough toughness, and highhardenability and hardenability and other process performance. For this kindof alloy tool steel for use in general belong to the high carbon alloy steel,carbon content was above 0.80%, chromium is an important alloying elementof this kind of steel, whose content is usually not more than 5%. But for somewear resistance requirement is very high, quenching after deformation is smalldie steel, the highest CR mass fraction of 13%, and to the formation of a large number of carbide, carbon content in steel is also very high, up to 2.0%~2.3%.Cold working die steel with high carbon content, the organization mostlyhypereutectoid steel or ledeburite steel. Steel commonly used with high carbon and low alloy steel, high carbon high chromium steel, chrome molybdenum steel, medium carbon chromium tungsten Bracelet steel etc..
Hot die forging, divided into hammer forging, extrusion and die-casting of several main types, including hot forging die, press forging die, stamping die,hot extrusion die and metal die casting die. Thermal deformation die at work in addition to bear great mechanical stress, but also bear the repeated heating and cooling do use, and caused great thermal stress. Hot work die steelshould have high strength, hardness and red hardness, wear resistance and toughness, but also should have high strength, good thermal stability, thermalfatigue resistance and corrosion resistance, also has high hardenability, so as to ensure the whole section has the mechanical consistency can. For die casting die steel, also has a surface layer after repeated heating and coolingdoes not crack, and subjected to liquid
State of the metal flow impact and erosion performance. This kind of steel is usually belongs to the medium carbon alloy steel, carbon content in 0.30%~0.60%, belongs to the sub eutectoid steel, there is also a part of steelas the alloy elements added more (such as tungsten, molybdenum, vanadium,etc.) and become the eutectoid or hypereutectoid steel. Steel commonly used with chromium manganese steel, chrome nickel steel, chromium, tungsten steeletc..
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