Smooth Overlay Plate

Smooth overlay plate was manufactured using advanced fusion bond submerged arc welding technology to apply a highly abrasive resistant chromium carbide on to a steel substrate producing consistent chemistry and micro structure (austenitic) with smooth overlay deposit.

This product is usually referred to as chromium carbide overlay (CCO) plate on the market. The hardfacing overlay is suitable for severe abrasive wear and impact applications.
The ultimate hardfaced product for your application depends on the material–whether rock, sand, gravel or other substance–striking or sliding along the surface of your wear part. It also depends on the angle and speed of impact as well as the operating temperature.

Technical Specification:

1. Base Material:    ASTM A36(Q235B), ASTM A529A(Q345B), other weldable steel is optional;
Base thickness: 3 to 12 mm
2. Hardfacing Layer:  Smooth Chromium carbon alloy on Fe basis(austenite)
Mean hardness: >58HRC
Layer thickness: 3 to 12 mm
3. Welding Processes: Advanced submerged arc welding
4. Alloy Description: Austenitic chrome carbide iron(Chromium white iron)
5. Carbide Hardness: >1500HV
6. Volume Fraction of Carbide: >30%
7. Chemical Composition: Carbon: 3-6%, Chromium: 18-34%

*Various alloys to be used depend on different operating condition and applications. 

8.Microstructure:  

Composed of a high proportion of extremely hard primary M7C3 chromium rich carbides dispersed in a ductile eutectic austenite matrix.
Maintains 30% to 50% of primary carbides to provide a good wear resistance and homogenous bonding.

9. Typical Applications: 
Widely used in the mining, power generation(Coal), cement, dredging, steel production, waste handling, glass production, and pulp and paper industries. Some specific applications include: