Is Your Plastic Product Requiring Nitrided Or Bimetallic Screw?
Date:2022-8-04 Author:hcscrew
When it comes to choosing the right screw for your plastic extrusion process, understanding the differences between nitrided and bimetallic screw is essential. This guide will help you determine whether a nitrided screw or a bimetallic screw is the best fit for your needs.
Nitrided Screw vs. Bimetallic Screw
Nitrided Screw
Nitrided screws are hardened through a process called nitriding, where nitrogen atoms are diffused into the surface of the metal. This process results in screws that are stronger, more durable, and more resistant to corrosion than untreated steel screws.
Bimetallic Screw
Bimetallic screw are constructed from two different metals, each offering unique properties. These screw are designed for applications requiring high strength and corrosion resistance. The combination of metals allows for enhanced performance in demanding extrusion environments.
Why Are Nitrided Screw Popular?
Nitrided screw remain popular due to their economical nature and sufficient performance for many applications. In countries like Germany, the USA, and Japan, nitrided steel screw are still widely used, especially in smaller and medium-sized extruders.
Why Choose Bimetallic Screw?
With the increasing demands of modern extrusion processes, bimetallic screw have become the preferred choice. They offer superior wear resistance and durability, making them ideal for high-pressure, high-speed extrusions.
Detailed Comparison: Nitrided vs. Bimetallic Screw
1. Nitrided Screw
Advantages:
- – Economical
- – Suitable for various applications
Disadvantages:
- – Limited wear resistance
- – Susceptible to corrosion
- – Thin nitrided layer (around 0.5 mm) wears away quickly
2. Bimetallic Screw
Advantages:
- – High wear resistance
- – Excellent corrosion resistance
- – Long lifespan
Disadvantages:
- – Higher initial cost
Common Bimetallic Screw Treatment Methods
1. Hard Chrome Plating
This chemical treatment involves coating the screw with a thin layer of chrome, improving surface finish and corrosion resistance. However, the plating process is demanding and can lead to issues if not performed correctly.
2. Surface Flame Hardening
A cost-effective treatment where the screw surface is hardened using a flame, achieving a quenching depth of 2-3 mm. This method is suitable for large screws.
3. Bimetallic Particle Overlay
This method involves welding a layer of bimetallic particles onto the screw surface using techniques like electric arc welding or plasma welding. The overlay improves the screw’s hardness and wear resistance.
4. Spray Coating with Bimetallic Particles
This advanced treatment involves spraying a coating of bimetallic particles onto the screw surface, enhancing wear resistance and durability.
5. Other Treatments
Carburizing and boron carburizing are also used to enhance screw performance, though these methods are less common and still under development.
Conclusion
While nitrided screw are still in use, bimetallic screw offer superior performance for modern extrusion processes. Choosing the right screw depends on your specific needs and the demands of your production environment.
For expert advice on selecting the best screw barrel for your application, contact HUACHEN Screw, a leading screw barrel manufacturer in China. We offer a wide range of customized screw barrels to meet your unique requirements.
About HUACHEN
HUACHEN Screw has been a leading bimetallic alloy screw barrel manufacturer in Zhoushan Jintang since 1993. As one of the top companies in designing and processing high-strength extrusion spare parts screw barrels, HUACHEN Screw provides a wide range of services, including drawing rebuilding, design, modification, and customization. Our company has successfully exported and supplied screw barrels to customers worldwide.
For more information, visit HUACHEN Screw.
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