CCO Wear Plate
CCO Wear Plate is a composite wear-resistant material combining a tough steel base with a high-chromium carbide overlay layer. Its unique composition provides exceptional hardness, excellent abrasion resistance, and strong impact support, making it an ideal solution for high-wear industrial environments where durability and service life are critical.
- Description
CCO Wear Plate (Chromium Carbide Overlay Wear Plate) is a type of bimetallic wear-resistant steel plate produced by depositing a high-hardness chromium carbide alloy layer onto a mild steel or low-carbon steel base plate through a welding or overlay process. It is widely used in heavy wear environments such as mining, cement production, power plants, and material handling systems.
Main Structure of CCO Wear Plate
CCO wear plate consists of two key layers:
- Base Plate (Backing Steel): Provides structural strength and toughness
- Hardfacing Layer (Overlay): Provides wear resistance through high chromium carbide content
Chemical Composition of Overlay Layer
The wear-resistant surface layer is typically an iron-based alloy enriched with chromium and carbon.
| Element | Typical Content (%) | Function |
|---|---|---|
| Chromium (Cr) | 20–35 | Forms hard chromium carbides for wear resistance |
| Carbon (C) | 3–5 | Combines with chromium to form hard phases |
| Iron (Fe) | Balance | Matrix structure |
| Manganese (Mn) | Small amount | Improves toughness |
| Silicon (Si) | Small amount | Improves weldability |
The combination of chromium and carbon forms extremely hard carbides (such as Cr7C3 and Cr23C6), which are the key to abrasion resistance.
Base Metal Composition
| Element | Content (%) |
| Carbon (C) | ≤0.25 |
| Manganese (Mn) | 0.5–1.5 |
| Silicon (Si) | ≤0.5 |
| Iron (Fe) | Balance |
The base plate ensures good toughness and impact resistance while supporting the hard overlay layer.
Mechanical and Wear Properties
High Hardness Surface Layer
The overlay hardness typically ranges from:
- 55–65 HRC (Rockwell hardness)
- Equivalent to extremely high wear resistance compared with standard steel
Excellent Abrasion Resistance
CCO wear plates are designed to resist:
- Sliding abrasion
- Impact abrasion
- Particle erosion
- Material flow wear
Strong Impact Support
The base steel provides toughness, allowing the material to absorb mechanical shock without cracking.
Good Bonding Strength
Metallurgical bonding between overlay and base plate ensures:
- No delamination under normal working conditions
- Stable performance under heavy load
- Long service life in harsh environments
Wear Resistance Mechanism
The performance of CCO wear plate is mainly achieved through:
- Formation of hard chromium carbide particles
- Uniform distribution of wear-resistant phases
- Hard surface resisting cutting and grinding action
- Tough base layer absorbing impact energy
Performance Comparison
| Property | CCO Wear Plate | Mild Steel | Hardox-Type Steel |
| Hardness | Very High | Low | High |
| Abrasion Resistance | Excellent | Poor | Good |
| Impact Resistance | Medium–High | High | High |
| Service Life | Very Long | Short | Long |
Typical Applications
CCO wear plates are widely used in industries with severe wear conditions:
- Mining equipment liners
- Cement plant chutes and hoppers
- Coal handling systems
- Power plant ash systems
- Steel plant conveyors
- Excavator buckets and dump trucks
- Crusher liners and screens
- Bulk material transfer systems
