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Tungsten Carbide Overlay

Tungsten Carbide Overlay provides significantly higher hardness and wear resistance than high chromium weld overlay, making it suitable for extreme abrasion conditions. However, high chromium overlay offers better toughness and cost efficiency, making it more widely used in general industrial applications.

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Tungsten Carbide Overlay

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Hardfacing Wear-resistant Plate

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Product Details

Tungsten Carbide Overlay is an advanced wear-resistant surface layer made by embedding tungsten carbide particles into a welding matrix on a steel base plate. It is widely used in extreme wear environments such as mining, oil drilling, and high-impact material handling.

Compared with traditional high chromium weld overlay (CCO / chromium carbide overlay), tungsten carbide overlay offers significantly different performance characteristics in hardness, wear resistance, and application scope.

Material Structure Difference

Tungsten Carbide Overlay

Hard phase: tungsten carbide (WC particles)
Matrix: nickel-based or iron-based alloy
Structure: extremely hard particles embedded in ductile matrix

High Chromium Weld Overlay

Hard phase: chromium carbides (Cr₇C₃, Cr₂₃C₆)
Matrix: iron-based alloy
Structure: carbide particles formed during welding solidification

Wear Resistance Comparison

Feature	Tungsten Carbide Overlay	High Chromium Overlay
Hardness	Extremely high (highest level)	High
Abrasion Resistance	Excellent (extreme wear)	Very good
Impact Resistance	Moderate (carbide brittleness)	Better toughness
Particle Erosion Resistance	Outstanding	Good
Service Life	Very long in severe wear	Long in general industrial use
Cost Level	Higher	Lower

Performance Characteristics

Tungsten Carbide Overlay Advantages

Highest wear resistance among industrial overlays
Excellent resistance to sand, gravel, and slurry erosion
Ideal for extreme abrasion environments
Long service life in highly aggressive conditions

High Chromium Overlay Advantages

Better balance of wear resistance and impact toughness
More cost-effective for large-area coverage
Easier to weld and repair
Suitable for general industrial wear applications

Application Differences

Tungsten Carbide Overlay Applications

Oil drilling tools and wear parts
Mining drilling and crushing equipment
High-speed slurry pipelines
Extreme abrasion zones
Precision wear components

High Chromium Overlay Applications

Mining chutes and hoppers
Cement clinker handling systems
Coal and power plant equipment
Bulk material transport systems
General industrial wear protection

Cost and Application Strategy

Tungsten carbide overlay: used for extreme wear + high-value critical parts
High chromium overlay: used for large-area, cost-sensitive industrial wear protection

In many cases, they are selected based on balancing wear severity vs. budget efficiency.