Screw and Barrel for Rubber Machine

Specification: 
Rubber pin screw barrel diameter: Φ75mm-φ200mm
Rubber cold, hot feed screw barrel diameter: Φ30mm-φ300 mm
Aspect ratio: 12-18


Base material:
1) 38CrMoAlA(JIS SACM645)
2) 42CrMo(AISI 4140)
3) 4Cr5MoSi V1 (JIS SKD-61)


Process:

Heat treatment

Nitriding treatment


Technical Parameters:

Nitriding depth: 0.50mm-0.80mm                                
Nitriding hardness: 900-1000HV               
Nitriding: <= Level 1                   
Surface roughness: Ra 0.4                  
Screw straightness: 0.015mm                
The hardness of the surface after chrome plating:≥950HV       
Chromium layer thickness: 0.025~0.085mm          
Double alloy depth: 3mm


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