• Fragility of Nitration：Less Than Grade One
• Linearity of Screw：0.015mm
• Bimetallic Layer Thickness：2-3mm
• Hardness of Bimetallic：HRC58-62

 Material              
1)38CrMoAlA(JIS SACM645)
2)Cr12MOV(JIS SKD-11) 
3)4Cr5MoSiV1(JIS SKD-61) 
4)42CrMo(AISI 4140)
5)9Cr18MoV
Bimetallic Alloy Materials                           
1)Fe-based alloy 
2)Ni-based alloy/Deloro alloy 
3)Co-based alloy 
4)NiCo-based alloy 
5)Tungsten carbide/Wolfram carbide
Bimetallic Alloy level                      
Level A - containing Tungsten of 40%
Level B - containing tungsten of 25%
Level C - containing tungsten of 9.5%
DesigningScrew structure and compression  ratio can be designed according  to different products & different  clamping force requirement.Technology parameter        
Depth of Nitrided Layer: 0.5-0.8 mm
Hardness of Nitrided Layer: 950-1020Hv
Thickness of Hard Chrome Plating Layer: 0.03-0.08mm  
Hardness of Hard Chrome Plating Layer: ≥950HV
Depth of Bimetallic Layer: 2-3mm
Hardness of Bimetallic Layer: HRC58°-62°
Hardness After Hardening & Tempering:HB260-290
Nitrided Brittleness:Less Than Grade 1
Surface Roughness:Ra 0.4um
Screw Straightness:0.015mm
Advantage
1.Long lifetime,low energy consumption
2.Wonderful plasticizing
3. High wear resistance, anti- corrosion