1. Appearance, size and fit of the molded product 1. Defects on the product surface are not allowed: lack of material, burnt, top white, white

 1. Stoma     This is a small cavity formed by the gas that has not escaped during the solidification process of the metal. Its

    Carburizing and quenching is actually a composite process, namely carburizing + quenching. We are often used to talk about the two together, because

 1. Graphitization process of cast iron     The formation process of graphite in cast iron is called graphitization process. The basic process of the

 The 690 alloy tube used for the steam generator heat transfer tube of nuclear power plant bears the corrosion of high temperature, high pressure and

   Duplex stainless steel has the same proportion of ferrite and austenite, and has excellent mechanical properties and corrosion resistance. It is widely used in