Some descriptions abrasive mold

often with elements of Cr, while adding an appropriate amount Ni, Mo and v, function is to improve the hardenability and carburization, in order to facilitate cold extrusion, such steels in the annealed condition to a high plasticity and low deformation resistance , annealing hardness ≤ 1 00HBS. In cold extrusion after carburizing and quenching and tempering treatment, surface hardness up to 58 --- 62HRC. Such steel special steel abroad, such as in Sweden 8416, the United States and other P2 and P4. Often used 12CrNi3A and 12Cr2Ni4A domestic steel, 20Cr2Ni4A, good wear resistance, no collapse and surface spalling, die life. Steel element cr, Ni, Mo, V increases the hardness and wear resistance of the carburized layer and the core part of the strength and toughness.
2) Pre-hardened plastic mold steel
The carbon content of  roloc disc such steels 0.3%-O.55%, common alloying elements Cr, Ni, Mn, v and so on. To improve its machinability, add s, ca other elements. In recent years through the development, introduction and development of several typical plastic mold steel Y55CrNiMn-MoVS (SMI) is a Chinese-developed with S line cutting plastic mold steel, which is characterized by a hardness of pre-hardened state delivery 35_40 HRC, better machinability, no heat treatment after processing, can be used directly. Addition of Ni solid solution strengthening and increased toughness, adding Mn  cutting disc and S-form cutting phase MnS; adding Cr, Mo, V, increases the hardenability of steel on steel 8Cr2S are easy enough steel cutting precision molds.
3) hardening plastic mold steel
In recent years, developed a low cobalt, cobalt-free, low-nickel maraging steel, MASI is a typical maraging steel. The 8150C solution treatment, the hardness is 28-32HRC, bite be machined, and  thin cutting wheel then by 4800C aging, aging when folded out Ni3Mo, Ni3Ti other intermetallic compounds, the hardness of 48-52 HRC. High strength and toughness, dimensional changes during aging small welding performance is good, but the steel is expensive, not very popular in the country.
4) corrosion resistant plastic mold steel
To polyvinyl chloride (Pvc) and ABS and flame resistant resin based plastic products, decomposition products during the forming process