Product overview：
Rubber machine screw barrel specification:
Rubber pin screw barrel diameter: Φ 75mm - φ 200mm
Rubber cold and hot feeding screw barrel diameter: Φ 30mm - φ 300mm
Length diameter ratio: 12-18
Base material:
1)38CrMoAlA(JIS SACM645)
2)42CrMo(AISI 4140)
3)4Cr5MoSi V1 (JIS SKD-61)
Treatment process:
heat treatment
Nitriding treatment
Technical parameters:
Nitriding depth: 0.50mm-0.80mm
Nitriding hardness: 900-1000hv
Nitriding brittleness: < grade 1
Surface roughness: RA 0.4
Straightness of screw: 0.015mm
Hardness of surface chromium plating layer after nitriding: ≥ 950hv
Thickness of chromium plating layer: 0.025 ~ 0.085mm
Double alloy depth: 3mm
