Main Base materials 
  1.38CrMoAlA  (Nitriding Steel) 2.  SKD-61   (Special Tool Steel) 3.  42CrMo (Ultrahigh Strength   Steel) 4. DC53 ( Cold Work   Die Steel)   5. W6Mo5Cr4V2 ( High-Speed   Tool   Steel ) 6. HPT     
  
Main Alloy Materials 1.  Ni-based alloy/Deloro alloy 2.  Tungsten carbide/Wolfram carbide 3.  NiCo-based alloy 4.  Fe-based alloy 5.  Co-based alloy       
  
  
Processing Technics 1.  Heat treatment 2.  Quenching 3.  Nitriding treatment 4.  Bimetallic alloy welding 5.  Bimetallic alloy centrifugal casting 6.  Hard-chrome electroplating     
  
  
  
Technical parameters Nitriding layer depth 0.5-0.8mm Nitrided hardness HRC56-58 Nitrided brittleness Less than grade 1 Surface roughness Ra 0.4 Linearity of screw 0.015mm Hard-chrome plating hardness ≥HRC57 Chrome-plating layer depth 0.03-0.09mm Bimetallic layer depth 3 mm Bimetallic layer hardness HRC58-62 Above are main technical information, a suitable screw and barrel will be made according to your requirement.