Performance advantages of die steel

Commonly used steels include chromium-manganese steel, chromium-nickel steel, chromium-tungsten steel, etc. In addition to high hardness, strength, red hardness, wear resistance and toughness, hot work die steel should also have good high temperature strength, thermal fatigue stability, thermal conductivity and corrosion resistance. In addition, it also requires high Hardenability to ensure consistent mechanical properties throughout the section.

For some high wear resistance requirements, the deformation is very small after quenching, the maximum chromium mass fraction can reach 13%, and in order to form a large amount of carbides, the carbon mass fraction in the steel is also very high, up to 2.0 %~2.3%. Die steel can be roughly divided into three types: cold work die steel, hot work die steel and plastic die steel, which are used for forging, stamping, cutting, and die casting.

Hot work molds are divided into hammer forging, die forging, extrusion and die casting, including hot forging dies, press forging dies, stamping dies, hot extrusion dies and metal die-casting dies. In general, hot work die steel can be used for injection molding or extrusion molding die; cold work die steel can be used for thermoset molding and molds that require high wear resistance and high strength.

The cold work die has steel. According to the working conditions of its manufacture, it should have high hardness, strength, wear resistance, sufficient toughness, and high hardenability, hardenability and other process properties. The domestic steel grade is 4Cr5M0SiVl. The carbon content of cold work die steel is relatively high, and most of its structure belongs to hypereutectoid steel or ledeburite steel. North American Die Casting Association, standard NADCA2 This article is transferred from 07-90, the carbon content of medium and high grade H13 steel is specified as (0.37~0.42)%.