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Parallel twin screw barrel

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Parallel twin screw barrel

1. The material

High quality alloy steel

(1) 38CrMoALA(JIS SASCM645)

(2) 42CrMo(JIS SCM440)

(3) 9Cr18MoV

(4) CW6M05Cr4V2


2. Treatment methods

Heat treatment

Nitriding treatment

Electrically paced hard chrome layer

Spray corrosion resistant, wear resistant bimetal layer


3. Product features

All kinds of screw barrel are made of high quality alloy steel 38CrMoALA. The product has the characteristics of high wear resistance, corrosion resistance and life improvement after negative ion nitriding. It can replace imported products. All technical indicators are strictly in accordance with JB/T8538-1997 and ISO9002 standards.


4. Product specifications and technical indicators

Screw barrel specifications:

? 65, ? 80, ? 90, ? 105, ? 125, ? 146,? 150, ? 170, ? 180, ? 190, ? 200.

Tempering hardness: HB240° ~ 280°

Nitriding hardness: HV850° ~ 1000°

Nitriding depth: 0.45 ~ 0.7mm

Nitriding brittleness: ≤ grade 2

Surface roughness: Ra0.4

Straightness of screw: 0.015mm

Hard chromium plating on the surface after nitriding: ≥900HV

Chromium plating thickness: 0.05 ~ 0.10mm

Alloy depth: 0.8 ~ 2.0mm

Double alloy hardness: HRC56° ~ 65° (alloy using nickel base alloy)