Engineered to withstand severe abrasive environment and high-impact conditions
A technical whitepaper by Runxing's metallurgical research department on hypereutectic microstructures
Chromium Carbide Overlay (CCO) wear plates achieve their outstanding resistance to abrasive wear via their unique microstructure. Under solidifying conditions, the alloy system containing 3.5% to 5.5% Carbon and 25% to 35% Chromium deposits primary hexagonal-shaped M7C3 chromium carbides. These carbides exhibit a hardness ranging from 1200 to 1600 HV (Vickers), significantly harder than quartz (typically 900 HV) and silica. By anchoring these hard particles in a tough, eutectic matrix of austenite and carbide, the overall bulk plate hardness reaches 58 to 62 HRC (Rockwell C). This structure effectively withstands severe grinding abrasion, slide erosion, and mild impact forces.
Our manufacturing plant leverages advanced automated weld surfacing techniques, notably Open Arc (OA) and Submerged Arc (SA) welding procedures. This helps manage the thermal input during the deposition of the flux-cored wires onto structural steel backings (typically Q235B or Q355B). Controlling dilution is crucial: excessive dilution with the base metal reduces carbon and chromium contents, decreasing the wear-resistant properties of the overlay. Our system maintains dilution to under 10% in the outer pass, ensuring the chemical composition is consistent from the interface to the outer wear surface.
Translating wear mechanics into real-world operational reliability across global industrial sectors
Critical elements in cement mills, such as separators, raw mill chutes, vertical mill liners, and hopper systems, operate under constant abrasive stress from raw minerals. Implementing CCO wear plates significantly extends operational cycles and minimizes unplanned shutdowns.
Our solutions protect truck beds, crusher feed hoppers, dragline buckets, and wear-resistant pipes from severe abrasion. By custom-engineering CCO plates to the specific geometry of excavation equipment, we optimize equipment reliability and throughput.
Steel mills operate under harsh conditions with raw materials, high temperatures, and corrosion. Our heat-resistant chromium carbide overlays maintain high hardness in high-temperature blast furnace components, coke guide plates, and sinter plants.
Coal-fired power stations require wear protection for fan blades, pulverizer components, coal hopper liners, and conveyor chutes. Our bimetallic wear plates ensure long-term stability and wear protection under high-velocity particle erosion.
Conveying, loading, and unloading bulk materials in ports subjects stacking and picking machinery to continuous sliding abrasion. High-performance overlay plates help maintain the mechanical integrity of hoppers and chutes, protecting them against premature failure.
For high-abrasion environments with lower impact, we supply wear-resistant alumina ceramic components. Sintered from high-purity superfine alumina powder, these liners offer wear protection for conveying systems handling fine materials.
Industrial Hardfacing Pioneers Since 2010
Tangshan Runxing Machinery Co., Ltd. is located in the industrial heartland of Tangshan, Hebei Province, and specializes in the research, development, and production of wear-resistant steel components. Since 2010, our facility has focused on producing high-grade chromium carbide overlay (CCO) wear plates, custom fabricated wear liners, hardfacing flux-cored welding wires, and automatic hardfacing welding machinery.
To streamline international transactions, our global export operations are handled by Hebei Yuwan International Trade Co., Ltd. This partnership allows our engineering teams to focus on technological development and quality control, while Yuwan International manages trade compliance, custom clearance, logistics, and payment collection.
Read More About Our Journey >The strategic advantages of our advanced manufacturing facility in Hebei, China
Our facility is located in Tangshan, Hebei, a major steel production hub. This provides us with direct access to high-quality base plates (such as Q235B and Q355B) and raw materials, reducing local transportation costs and ensuring supply chain stability.
We manage all stages of the manufacturing process internally. By producing our own hardfacing flux-cored welding wires and developing our automated CNC cladding machinery, we maintain quality standards across our wear plate products.
Using our CAD/CAM and metal machining setups, we manufacture custom wear liners to precise customer specifications. This includes detailed hole configurations, countersunk inserts, and specific bending radii for various industrial applications.
Exploring next-generation wear technologies and environmentally conscious hardfacing processes
Our research and development team, in collaboration with the Metal Materials and Forming Technology group at Tangshan University, is investigating the effects of adding trace elements (such as Niobium, Boron, Titanium, and Tungsten) to the overlay. The addition of Boron and Niobium helps form smaller, more evenly distributed secondary carbides. This grain-refining technique improves crack resistance and toughness, helping the overlay withstand high-impact mining and conveying environments.
Traditional open-arc welding processes can generate substantial fumes and airborne particulates. In response, Runxing is developing next-generation self-shielded flux-cored wires with reduced slag and fume emissions. By refining the chemical composition of the internal flux, we have lowered emissions of toxic metals, creating a safer working environment during on-site fabrication and repair.
Our manufacturing line integrates 4-gun CNC automated welding equipment, which allows us to adjust critical parameters such as travel speed, oscillation width, and welding currents dynamically. We are currently testing infrared thermal imaging systems to monitor the cooling rate of the overlay. This helps ensure consistent carbide precipitation across large-format wear plates.
Our international presence and focus on quality and compliance
Runxing Machinery has maintained a partnership with German wear-resistance specialist VAUTID since 2019. We use VAUTID materials for specialized industrial products, ensuring compliance with international quality standards.
We regularly participate in international trade exhibitions, including EXPOMIN 2023 in Chile and the South Africa International Construction Machinery Exhibition 2024. These events allow us to connect with partners and refine our solutions for local mining and industrial needs.
We work closely with the academic community, hosting visits from Hebei metallurgy professors and Tangshan University researchers. This relationship bridges the gap between scientific metallurgy research and commercial manufacturing processes.
Expert answers to common engineering questions regarding Chromium Carbide Overlay (CCO) plates
Insights, technical updates, and global exhibition news from Runxing Machinery
Our digital platform, www.runxing-machinery.com, has entered trial operations, providing a comprehensive channel for sourcing wear-resistant products, hardfacing consumables, and custom fabrication services.
Runxing showcased its latest CCO wear plates and automatic cladding machinery at the Johannesburg International Convention Center during the 2024 South Africa International Construction and Mining Machinery Exhibition.
A delegation led by Dean Yuan Shaoqiang and metal forming specialists from Tangshan University visited our facility to review collaborative R&D efforts focused on refining the microstructure of our hardfacing overlays.
Explore our full range of wear plates, cladding equipment, and specialized repair services
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