Prehardened mold steel for plastic is the pri mary formanufacturing high quality plastic mold . Withthe rapiddevelopment of moldindustryin our country,this kindof steel exhibits extensive application prospect . How-ever ,because of property deficiencies o Prehardened mold steel for plastic is the pri mary for manufacturing high quality plastic mold. With the rapid development of moldindustry in our country, this kind of steel shows extensive application prospect.