Injection mold on the material is also divided into soft and hard mode of the points, the soft mold is generally used P-20 pre-hardened steel, there are places behind this with 45 or more carbon steel to do, the production capacity is generally about 50 million; Hard mold is made of H-13 (chrome steel) or 420 (stainless steel) and other hot die steel, to heat treatment processing technology, materials and processing costs more than doubled, production capacity in more than one million times.