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Chromium Carbide Overlay
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Chromium Carbide Overlay (CCO) is a wear-resistant composite steel plate made by depositing a high-chromium hardfacing layer onto a structural steel base plate. It is widely used in mining, cement, power generation, and heavy industrial wear applications.
One of the key technical aspects of CCO products is the size configuration of the base plate and the weld overlay layer.
Base Plate Size (Backing Steel Plate)
The base plate provides structural strength and supports installation and fabrication.
Common base plate thickness options:
- 3 mm – 6 mm: light-duty wear applications
- 6 mm – 10 mm: standard industrial applications
- 10 mm – 20 mm: heavy-duty impact environments
- 20 mm and above: extreme mining and bulk handling systems
Common base plate materials:
- Mild steel (low carbon steel)
- Low alloy structural steel
Typical base plate functions:
- Mechanical support
- Impact absorption
- Welding and installation base
Weld Overlay Layer Thickness (Hardfacing Layer)
The overlay layer is the functional wear-resistant surface formed by chromium carbide welding.
Common overlay thickness options:
- 2 mm – 3 mm: light abrasion protection
- 3 mm – 5 mm: standard wear resistance
- 5 mm – 8 mm: heavy abrasion conditions
- 8 mm – 12 mm: extreme wear environments
The overlay layer is built through multiple welding passes depending on required thickness.
Total Plate Thickness Structure
CCO plate is often described using combined thickness notation:
Example formats:
| Specification | Base Plate | Overlay Layer | Total Thickness |
|---|---|---|---|
| 6+4 | 6 mm | 4 mm | 10 mm |
| 8+4 | 8 mm | 4 mm | 12 mm |
| 10+5 | 10 mm | 5 mm | 15 mm |
| 12+6 | 12 mm | 6 mm | 18 mm |
| 16+8 | 16 mm | 8 mm | 24 mm |
These combinations are selected based on wear intensity and impact requirements.
Design Considerations for Size Selection
When selecting base plate and overlay thickness, engineers consider:
- Abrasion level of working environment
- Impact force from material flow
- Equipment structural requirements
- Expected service life
- Installation and fabrication conditions
Thicker overlay layers provide longer wear life, while thicker base plates improve impact resistance.
Application Impact of Different Sizes
Thin overlay systems
- Light material handling
- Moderate wear environments
- Cost-sensitive applications
Medium thickness systems
- Mining chutes and hoppers
- Cement and clinker systems
- Bulk material handling
Heavy thickness systems
- Severe mining conditions
- High-impact transfer systems
- Continuous abrasion environments
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