Specification:
Diameter of pin screw and barrel: Φ75mm-φ200mm
Diameter of cold feed or hot feed screw and barrel: Φ30mm-φ300 mm
L/D ratio:12-18
Technical Information Base Materials:
1)38CrMoAlA(JIS SACM645)
2)42CrMo(AISI 4140)
3)4Cr5MoSi V1 (JIS SKD-61)
Technics:
Heat treatment
Nitriding treatment
Technical parameter:
Nitrided layer depth:0.5-0.8mm
Nitrided hardness:900-1000HV
Nitrided brittleness: Less than grade 1
Surface roughness: Ra0.4
Linearity of screw: 0.015mm
Hard-chrome plating hardness after nitriding: :≥950HV
Chrome-plating layer depth:0.025-0.085mm
Bimetallic layer depth:3mm