1 Specification
Φ15mm~Φ250mm
Aspect ratio:L/D=15-45
Screw can be used ordinary type, gradient type, mutation type, pin type, barrier type, separate type, exhaust type and so on.
Screw compression ratio can be based on different raw material design, user products and different formulations can also be designed
2 Substrate material
1) 38CrMoAlA(JIS SACM645)
2) 42CrMo(AISI 4140)
3) Zinc 3 # steel 9Cr12Mo (stainless steel)
3 Treatment Process
Quenched and tempered, qualitative, nitriding treatment.
4 Technical Parameters
Nitriding depth: 0.50mm-0.80mm
Nitriding hardness: 850-1000HV
Nitriding brittle: ≤level 1
Surface roughness: Ra 0.4
Screw straightness: 0.015mm
