What material is used for extruder screws?

Jul 12,2024

Extruder screws are typically made from materials that can withstand high levels of wear, pressure, and temperature. Common materials include:

1. Tool Steels: These are popular due to their hardness and durability. Specific types include:
D2 Steel: Known for its high wear resistance and ability to hold a sharp edge.
M2 Steel: Offers good wear resistance and toughness.

2. Nitrided Steels: These are treated with a nitrogen-hardening process to increase surface hardness.
4140 Steel: A chromium-molybdenum alloy steel, often used because of its balance of strength and toughness.
4340 Steel: Another chromium-molybdenum alloy, with added nickel for greater toughness.

3. Stainless Steels: Used for their corrosion resistance.
17-4 PH Stainless Steel: Precipitation-hardened stainless steel that offers a good combination of strength and corrosion resistance.
316 Stainless Steel: Known for its high corrosion resistance, especially in harsh environments.

4. Bimetallic Screws: These have a base of a durable material, such as a tool steel, with a wear-resistant alloy coating.
The coating can be made from materials like nickel-based alloys or tungsten carbide to extend the screw's life.

5. Carbide Materials: Extremely hard and wear-resistant, often used in very high-wear applications.
Tungsten Carbide: Offers exceptional hardness and wear resistance, though it is more brittle than steel.

Each material and treatment option is chosen based on the specific requirements of the extrusion process, including the types of materials being extruded and the operating conditions of the extruder.
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