Shanghai Alpha Machinery Co., Ltd.

Bimetallic Barrel

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Bimetallic Cylinder

Image of Bimetallic Barrel

What is the bimetallic cylinder?
Image of Bimetallic Barrel The bimetallic cylinder consists of a general base material and an armoured layer which is homogeneously attached to the base material on inner diameter surface. It has an certain thickness and certain hardness. This layer is an or wear-resistant alloy, or corrosion-resistant alloy, or both functions. This armouring layer is locked on base material in metallographic structure. These two kinds of material take different functions in hand, but form an uniform whole - The bimetallic cylinder.

Image of Bimetallic Barrel Image of Bimetallic Barrel

Three kinds of alloys for bimetallic cylinder
Characteristic and Property α101 Alloy α201 Alloy α301 Alloy
Wear resistance
Corrosion resistance
Alloy Fe-Ni-B Ni-Co-Cr-B Fe- Cr-Ni-B Carbide
Hardness (HRC) 58 ~ 64 50 ~ 56 58 ~ 65
Strain to fracture (%) 0.30 0.24 0.20
Modulus of elasticity (kgf / mm) 18600 215000 22000
Cofficient thermal
Expansion (/°C) 		15°C ~ 250°C 10.0 x 10 11.9 x 10 11.2 x 10
15°C ~ 400°C 10.5 x 10 12.6 x 10 11.9 x 10
Mark as in list: Excellent ; Very good ; Good

ID precision of bimetallic cylinder
Surface roughness Ra 0.8 (0.4~1.6S)
(L/D=25)
Straightness		 ID (mm) Straightness
15 ~ 40 0.05
40 ~ 90 0.08
90 ~ 200 0.10
ID Tolerance H7

Manufacturing range of bimetallic cylinder
  Outer diameter Inner diameter Length
Maximum 450 mm 350 mm 5000 mm
Minimum 80 mm 22 mm 300 mm
If outside the above size range, please contact us.

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