1.General Products Descriptio
Chromium carbide overlay wear plate offers superior strength and corrosion resistance. This bimetallic product starts with a mild steel base plate that is then fused by welding with a chrome carbide steel. The hardfacing overlay plate is suitable for severe abrasive wear and moderate to low impact applications. Up to 32% chrome and up to 5.8% carbon, chromium carbide metallurgically bonds to the steel’s surface to form a protective and durable surface that will not separate from the base metal. The multiple-layer is also capable of maintaining full wear resistance up to 350℃ and the typical surface and hardness of 55 HRC at elevated temperature up to 540℃. It is available in single layers or multiple layers up to 20mm(3/4″) in overlay thickness.
2.Key Benefits
●Same wear resistance guaranteed from surface down to 75% of the overlay.
●Optimal carbide composition to provide good combination of wear resistance and homogenous bonding.
●Good formability due to staggered cracking pattern on overlay surface.
●Exceptional resistance to chipping, peeling, and separation
●On average, outlasts AR steels by 4 to 6 times
●Variety of thickness combinations available
3.Typical Applications
CCO plate is widely used in the mining, power generation, cement, dredging, steel production, waste handling, glass production ,and pulp and paper industries. Some specific applications include:
| Mining | Chutes/hoppers, liners for truck beds, dozer blades, shovel buckets, dragline buckets, excavators |
| Cement | Separator guide vanes, discharge cines for clinker storage bins, chutes for sintering ore conveying, outlet ducts for clinker grinding mills, receiving hoppers |
| Dredging | Dredging pipes and pumps, suction pipelines ,pump discharges |
| Steel | Fan blade/housings, coke vibrating screen plates |
| Power | Coal handling chutes, coal feeder liners, crusher screen plates, classifier cones, journal liners, silo bunkers |
4.Standard Dimensions
| Standard overlay thickness | Standard plate sizes | ||||
| Single pass | Multiple passes | ||||
| Metric unit | Imperial unit | Metric unit | Imperial unit | Metric unit | Imperial unit |
| 3 on 6 | 1/8” on 1/4” | 6 on 6 | 1/4″ on 1/4” | 1.5m × 3.0m | 5′ × 10’ |
| 5 on 8 | 3/16”on 5/16″ | 6 on 10 | 1/4″ on 3/8” | 1.5m × 3.0m | 5′ × 10’ |
| 10 on 10 | 3/8″ on 3/8” | 1.5m × 3.5m | 5′ x 11.5’ | ||
| 12 on 12 | 1/2″ on 1/2” | 1.5m × 3.5m | 5′ x 11.5’ | ||
| 20 on 10 | 3/4″ on 3/8” | 1.5m × 3.5m | 5′ x 11.5’ | ||
5.Mechanical Properties
·Surface Hardness
Because it is composed of a combination of high chrome and high carbon, chromium carbide steel plate achieves unparalleled hardness. When the two metals join forces, they form chromium carbide crystals that reach 65HRC on the Rockwell hardness scale. That’s five times the hardness of unplated mild steel.
| Number of overlay passes | Typical surface hardness |
| Single pass | 55 to 58 HRC(590 TO 630 HV) |
| Double passes | 59 to 62 HRC(675 to 750 HV) |
| Triple and more passes | 60 to 64 HRC(700 to 810 HV) |
NOTE:Surface hardness is measured on machined flat surface just below overlay surface
·Wear Properties
| Number of overlay passes | ASTM G65 – Procedure A weight loss | |
| Surface | 75% depth of overlay | |
| Single pass | 0.24g maximum | 0.24g maximum |
| Multiple passes | 0.16g maximum | 0.16g maximum |
NOTE:1.ASTM G65 is a standard test measuring sliding abrasion resistance using a dry sand/rubber wheel apparatus. ASTM G65-Procedure A is the most severe test method.
2.ASTM G65 wear test is conducted at 75% depth of the overlay materials to ensure consistently good wear resistance from the top surface through to the depth of 75% of the overlay.
6.Tolerances
·Thickness
Overall and overlay thickness tolerances can be guaranteed within+/-10% of specified thickness.
·Flatness
Plate flatness tolerance can be guaranteed within +/-3mm over 1.5m plate length for plate
dimensions equal to or less than 1.5m x 3.0m long, the following flatness guarantees apply.
| Standard overlay thickness |
Flatness tolerance over 1.5m(5′)plate length Metric unit(Imperial unit) |
||||
| Metric unit | Imperial unit | 1.5mx3.0m(5’x10′) | 2.1mx3.5m(6.9’x11.5′) | ||
| Metric unit | Imperial unit | Metric unit | Imperial unit | Metric unit | Imperial unit |
| 5 on 8 | 3/16″ on 5/16″ | 25mm | 1″ | 41mm | 1-5/8″ |
| 6 on 6 | 1/4″ on 1/4″ | 25mm | 1″ | Not available | |
| 10 on 10 | 3/8″ on 3/8″ | 12mm | 1/2″ | 25mm | 1″ |
| 12 on 12 | 1/2″ on 1/2″ | 6mm | 1/4″ | 16mm | 5/8″ |
7.Fabrication and Other Recommendations
Welding, cutting, forming and machining
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