- Description
Chromium Carbide Overlay Wear Plate: Surface Characteristics of Hardfaced Steel Plate
Chromium carbide overlay wear plate (CCO plate) is a composite steel plate produced by depositing a high-chromium carbide alloy layer onto a carbon steel or low-alloy steel base. Its performance is defined primarily by its surface layer characteristics, which directly determine wear resistance and service life.
Compared with ordinary steel plates, the surface of CCO plates has a completely different microstructure and mechanical behavior.
1. Extremely High Surface Hardness
| Material | Surface Hardness |
|---|---|
| Chromium carbide overlay layer | HRC 58–65 |
| Wear-resistant steel (NM400/NM500) | HB 400–500 |
| Ordinary carbon steel | HB 120–200 |
The high hardness comes from large amounts of primary and eutectic chromium carbide particles embedded in the weld matrix.
2. Visible Surface Cracking Pattern (Stress Relief Cracks)
A unique feature of CCO plates is the presence of controlled micro-cracks on the surface.
- These cracks are normal and intentional
- They help release internal welding stress
- They do not affect wear performance
This is a key visual difference from traditional steel plates.
3. Carbide-Rich Microstructure
| Component | Function |
|---|---|
| Chromium carbides (Cr7C3, Cr23C6) | Main wear-resistant phase |
| Iron-based matrix | Supports carbide structure |
| Alloy additives (C, Mn, Nb, Mo) | Improve hardness and stability |
The surface is essentially a “carbide armor layer” designed for extreme abrasion resistance.
4. Excellent Abrasion Resistance Surface
- Strong resistance to sliding abrasion
- High durability against fine particle erosion
- Stable performance in dry wear environments
This makes it ideal for coal, cement, sand, ore, and bulk material handling systems.
5. Smooth but Extremely Hard Surface Texture
Although very hard, the surface is relatively smooth due to controlled welding and finishing processes.
- Reduces material sticking
- Improves flow in chutes and hoppers
- Minimizes frictional resistance
6. Bimetallic Surface-Bond Structure
| Layer | Surface Function |
|---|---|
| Overlay layer | Provides wear resistance |
| Fusion zone | Metallurgical bonding layer |
| Base steel | Provides toughness and strength |
The surface layer is firmly bonded to the base plate through metallurgical fusion, not mechanical attachment.
7. Teda Ganghua Chromium Carbide Plate Supply Capability
As a professional wear-resistant steel supplier, Teda Ganghua provides high-quality chromium carbide overlay wear plates with stable surface hardness, uniform carbide distribution, and reliable bonding performance for mining, cement, steel, and power industries.
We support customized cutting, fabrication, and wear system design based on different industrial conditions.
Explore our wear-resistant steel products here:
Chromium Carbide Overlay Plate
Conclusion
The surface of chromium carbide overlay wear plate is defined by ultra-high hardness, carbide-rich microstructure, controlled stress cracks, and excellent abrasion resistance. These characteristics make it one of the most effective solutions for severe wear environments.
