Mold is important process equipment in manufacture industry. The manufacturing level of mold has become one of the important symbols of manufacturing level of products. Up to now, the mold has largely determined the quality and benefit of products. Mold materials and their advanced preparing technology are the most basic and critical core guarantee for obtaining mold products with high quality and life. At present, most of the frequently-used mold materials for stamping is alloying spheroidal graphi...