Welding Wire Supplier & Factory serving the Boston market

Technical Route & Chemistry of Chromium Carbide Overlay

In high-stress industrial applications, the primary enemy of metal equipment is scratching and grinding abrasion, which easily compromises structural plates. Runxing’s proprietary chromium carbide overlay (CCO) wear plates feature a tough, low-carbon steel backing plate that absorbs impact, combined with a highly alloyed hardfacing overlay that resists sliding wear. The overlay is deposited via open-arc cladding, yielding a composite with high levels of primary chromium carbides (Cr₇C₃) oriented perpendicular to the wear surface.

The microstructure of our CCO wear plates consists of hexagonal primary carbides embedded within a tough, eutectic matrix. When subjected to abrasive media, these carbides serve as load-bearing anchors, preventing micro-cutting and gouging of the softer binder phase. This bimetallic metallurgy provides a surface hardness rating of 58 to 65 HRC, even at elevated operational temperatures up to 1000°F (540°C).

Macro-Level Industry Applications

• Cement Manufacturing: Fan blades, separator guide vanes, chute liners, and vertical coal mill rollers suffer continuous fine-particle abrasion. Implementing RX-m Series plates increases service life by 300% to 500% compared to traditional steels.
• Mining Operations: Dragline buckets, excavator liners, primary hopper feeders, and slurry discharge lines deal with severe impact and high stress. CCO liners absorb high energy while preventing material hang-ups.
• Steel Processing: Coke hopper liners, sinter plant dust collectors, and blast furnace bell chutes operate under combined thermal and mechanical wear.
• Thermal Power Generation: Coal conduits, pulverizer housings, and exhaust fans require erosion protection from high-velocity ash and coal dust.
• Port & Maritime Logistics: Bulk cargo grab buckets, hopper hoists, and belt conveyor chutes encounter intense friction during high-volume unloading operations.