A bimetallic screw barrel consists of a durable steel core and a wear-resistant alloy inner liner, which is often a tungsten carbide or nickel-based alloy. The specific materials are chosen based on the application, with tungsten carbide used for high abrasion resistance and nickel-based alloys for corrosion resistance. These two layers are bonded together through a process like centrifugal casting. https://juyuan-machinery.com/bimetallic-screw-barrels-the-sustainable-backbone-of-modern-plastic-processing/#:~:text=What%20is%20a%20Bimetallic%20Screw,Glass/mineral%2Dfilled%20compounds

Materials breakdown

• Core: A tough steel base provides the necessary strength and structural integrity.
• Liner: A layer of wear-resistant alloy is bonded to the inside surface, which comes into contact with the plastic material.
  • Tungsten carbide: Chosen for its exceptional wear resistance, especially when processing abrasive materials like glass-filled plastics.
  • Nickel-based alloys: Used for high corrosion resistance when processing corrosive plastics.
  • Other alloys: Other options include chromium-nickel alloys and performance alloys. 

Bonding process

• The liner material is melted and bonded to the steel core using a metallurgical process, such as centrifugal casting.
• This creates an inseparable bond, ensuring the two layers work together to provide both strength and a hard, wear-resistant surface. 

Why it’s used

• This two-layer construction offers superior durability, corrosion resistance, and a longer lifespan compared to standard single-layer steel barrels.
• It allows for processing of demanding materials like PVC, engineering plastics, and other abrasive or corrosive compounds. 

If you are looking for high-quality bimetallic screw barrels, or need customized solutions for your extrusion or injection machines, please contact us today.

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