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