Specifications:

Screw diameter: Φ 45mm- φ 200mm

Length diameter ratio: 16-35

Screw compression ratio can be designed according to different products and formulas

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

Screw straightness: 0.015mm