Materials have stainless steel, ceramic, hard alloy (tungsten carbide), and can meet the needs of various well conditions, with advantages of high hardness, wear resistance, corrosion resistance. Features: 1) Castings of main alloys: Cobalt-base alloy, nickel -base alloy and stellite alloy; 2) Available forms: End product or blank; 3) Properties: Good resistance against corrosion and oxidation; 4) Main application: Extensively used in petrochemical industry, marine exploration, heat exchanger and pump;