The characteristics of Chromium Carbide Overlay.

1. Excellent wear resistance

Wear resistance is the most core feature of Chromium Carbide Overlay, mainly due to the high-hardness chromium carbide hard phase in its microstructure. The hardness of chromium carbide (such as Cr₃C₂, Cr₇C₃, etc.) can reach HV1300-1800, which is much higher than that of common abrasives (such as quartz sand HV800-1000, corundum HV2000 or so), and can effectively resist the cutting, squeezing and scouring effects of abrasive grains. Meanwhile, these hard phases are embedded in the metal matrix with better toughness (such as low-carbon steel and low-alloy steel matrix) in a dispersed or continuous distribution form, forming a synergistic effect of "hard phase wear resistance + matrix impact resistance", which not only avoids the brittle fracture of pure hard materials but also ensures the overall wear-resistant life. Under the same working conditions, the wear resistance of Chromium Carbide Overlay is usually 5 to 15 times that of ordinary low-carbon steel and 3 to 8 times that of high manganese steel, significantly reducing the wear and tear and replacement frequency of equipment.

2. Good impact toughness

Unlike traditional single hard alloy or ceramic coatings, Chromium Carbide Overlay is prepared by surfacing technology, forming a metallurgical bond between the substrate and the surfacing layer, with a high bonding strength (usually greater than 300MPa), avoiding the risk of coating peeling. Meanwhile, the metal substrate in the surfacing layer has good toughness, which can absorb external impact energy and alleviate the damage to the hard phase caused by impact loads. This "hard phase + tough matrix" structural design enables the Chromium Carbide Overlay to resist abrasive wear and withstand certain impact loads when subjected to impact wear (such as mine crusher liners and coal drop pipe elbows), and is less likely to crack or break. Its applicability far exceeds that of brittle wear-resistant materials.

3. Excellent corrosion resistance and high-temperature resistance

The Chromium content in the Chromium Carbide Overlay is relatively high (typically 15%-35%). Under high-temperature or corrosive conditions, a dense Cr₂O₃ oxide film is prone to form on the surface, which has excellent chemical stability. It can effectively prevent oxygen and corrosive media (such as acids, alkalis, and salt solutions) from penetrating into the substrate interior, thereby endowing the Chromium Carbide Overlay with certain corrosion resistance. In high-temperature environments below 800℃, the Chromium Carbide phase can remain stable, with a relatively low oxidation rate and little change in the strength and toughness of the matrix. Therefore, Chromium Carbide Overlay can also be used in high-temperature wear conditions, such as the trolley sideboards of sintering machines and economizer tubes of boilers in the metallurgical industry, expanding its application range.

4. Flexible customization and economy

The surfacing process of Chromium Carbide Overlay has strong flexibility and can adjust the thickness of the surfacing layer (usually 3-20mm), chromium content and the distribution density of the hard phase according to different working conditions. For instance, for areas with severe wear, the thickness of the surfacing layer can be increased, and for areas with significant impact, the content of the hard phase can be appropriately reduced to enhance toughness. In addition, Chromium Carbide Overlay typically adopts the form of "base material + local surfacing", that is, only the wear-resistant layer is surfacing on the easily worn parts of the equipment, rather than using expensive wear-resistant materials throughout, which significantly reduces material costs. Meanwhile, its extremely long wear-resistant service life reduces the downtime for equipment maintenance, enhances production efficiency, and its overall economic performance is significantly superior to that of traditional wear-resistant materials.

5. Wide applicability and easy processability

Chromium Carbide Overlay can be fabricated on the surfaces of various substrates, such as low-carbon steels like Q235 and Q345, as well as low-alloy steels. It can even be used to surface and repair worn old parts, achieving "remanufacturing" and reducing resource waste. The workpieces after surfacing can undergo conventional mechanical processing (such as cutting, drilling, and grinding), facilitating subsequent installation and assembly. In addition, the application forms of Chromium Carbide Overlay are diverse. It can be made into various wear-resistant components such as liners, pipes, elbows, blades, and chutes, covering wear-resistant equipment in multiple industries including mining, metallurgy, building materials, power, and chemical engineering. It is a highly versatile wear-resistant material.