Ni-Cr-B-Si Self-Fluxing Alloy Powder

Nickel-based Ni-Cr-B-Si self-fluxing alloy powders are widely used for surface hardfacing of plastic machinery because of their good wetting characteristics, stable melting behavior, corrosion resistance and wear resistance.

Depending on composition, typical deposited hardness ranges from approximately HRC 53–65.

These powders are suitable for extruder screws, injection molding screws, barrels, screw flights, mixing elements and other wear-prone surfaces. They can be processed by laser cladding, PTA welding and other compatible surface-deposition technologies.

Lower-hardness compositions are suitable where toughness and machinability are important, while higher-hardness compositions are designed for severe wear conditions.

Ni-WC Tungsten Carbide Reinforced Alloy Powder

For plastic machinery processing highly abrasive materials, GREENSTONE provides Ni-WC metal matrix composite powders combining a nickel-based matrix with tungsten carbide reinforcement.

Typical WC additions can be selected from approximately 5%, 10%, 25%, 35% or customized concentrations, depending on the required balance between toughness, deposition behavior and abrasive wear resistance.

Higher WC contents are particularly suitable for screws and barrels used with glass-fiber-reinforced plastics, mineral-filled polymers, engineering plastics and other abrasive feedstocks.

The nickel-alloy matrix provides metallurgical bonding and corrosion resistance, while hard WC particles significantly increase resistance against abrasive and erosive wear.

Fe-Based Wear-Resistant Alloy Powder

GREENSTONE iron-based powders provide an economical hardfacing solution for plastic machinery requiring high surface hardness without the cost of a fully nickel-based system.

Typical Fe-based systems can contain Cr, Ni, Mo, W and other strengthening elements, depending on the intended application.

Typical deposited hardness can reach approximately HRC 58–62, making these materials suitable for general-purpose screw and barrel rebuilding, wear-resistant overlays and industrial remanufacturing.

Alloy Powder for Centrifugal Casting of Barrels

Specialized alloy powders are available for centrifugal casting and bimetallic barrel manufacturing.

During centrifugal casting, the wear-resistant alloy forms the functional inner layer of the barrel while the structural outer body provides mechanical support. This approach is widely used in the manufacture of bimetallic extruder barrels and injection molding machine barrels.

Nickel-based, iron-based and carbide-reinforced compositions can be selected according to wear conditions, processed polymer and service requirements.

Alloy Powder for PTA Hardfacing of Screws

PTA powder hardfacing is widely used for rebuilding and reinforcing screw flights and other high-wear surfaces.

GREENSTONE powders feature controlled particle-size distribution and composition for stable powder feeding and deposition. Nickel-based and Ni-WC materials can be selected according to the required hardness and abrasive-wear resistance.

PTA-compatible powders are particularly suitable for rebuilding worn screws and producing new wear-resistant screw surfaces.

Alloy Powder for Laser Cladding of Screws and Barrels

Laser cladding provides precise heat input, relatively low dilution and strong metallurgical bonding, making it suitable for high-value screw and barrel manufacturing and remanufacturing.

GREENSTONE provides Ni-based, Fe-based and WC-reinforced laser cladding powders designed for controlled powder feeding and stable deposition.

Typical applications include screw flight reinforcement, dimensional restoration, local wear repair and production of functional wear-resistant coatings.

Key Advantages

GREENSTONE plastic machinery alloy powders provide several important advantages:

• High wear resistance: Designed for continuous contact with abrasive polymers, fillers, fibers and additives.
• HRC 53–65 hardness range: Multiple alloy systems allow hardness to be matched to actual operating conditions.
• WC-reinforced options: Tungsten carbide contents from approximately 5–35% and customized formulations are available for severe abrasive environments.
• Good metallurgical bonding: Suitable alloy systems form strong functional layers on compatible screw and barrel substrate materials.
• Multiple deposition processes: Available for laser cladding, PTA welding, spray-and-fuse processing and centrifugal casting.
• Controlled powder characteristics: Consistent particle-size distribution supports stable powder feeding and processing.
• Repair and new manufacturing: Suitable for both new screw/barrel production and restoration of worn high-value components.
• Customized compositions: Chemistry, carbide content, hardness and particle-size distribution can be tailored according to polymer type, substrate and deposition process.