Hot work die steel should have good high temperature strength, thermal fatigue stability in addition to high hardness, strength, red hardness, wear resistance and toughness, in addition, also requires good processability, such as heat treatment change Small, good processing performance, good corrosion resistance, grinding and polishing performance, good welding performance, high roughness, good thermal conductivity and working conditions, such as size and shape stability. Under normal circumstances, the injection molding or extrusion die frame can be used as a hot die steel; thermosetting and require high wear-resistant, high strength die-frame cold-formed steel frame can be used. The United States according to the mold service conditions will die steel is divided into four categories, high surface requirements of household appliances. For large mirror plastic mold, such as cars, appliances, audio-visual products. Precision mold

Formwork steel can be roughly divided into (cold work die steel), 290-310 Delivery Status: Steel to the state of annealing delivery. By mutual agreement, can also be delivered without annealing. Thermoplastic blow mold. Overloaded mold main components. Cold structural parts. Commonly used in the manufacture of TV housings, Sweden's 718,718H (ASSAB), PX5PX4, GS-711, GS-738, GS-312, GS-318, Austria's M238 ECOPLUS, CS718), SWP20, In the corrosion resistance of the plastic mold parts, (hot mold steel) and (plastic mold steel) 3 categories, for forging, stamping, cutting, casting and so on. Due to the different uses of various molds, the working conditions are complex, so mold steel,

According to their working conditions of the mold frame, should have high hardness, strength, wear resistance, sufficient toughness, and high hardenability, hardenability and other process performance. Alloy tool steel used for this type of application is generally high-carbon alloy steel with a carbon content above 0.80%. Chromium is an important alloying element of this type of steel and its mass fraction is usually not more than 5%. But for some high wear resistance, deformation is very small after quenching Die steel, the highest chromium content of up to 13%, and in order to form a large number of carbides, steel carbon content is also high, up to 2.0% ~ 2.3%. Cold work die steel high carbon content, die forging presses, stamping die, hot extrusion die and metal die-casting molds. In addition to the thermal deformation of the mold to withstand the huge mechanical stress, but also to withstand the repeated use of heat and cooling, causing a great thermal stress.