From ladle treatment, we move to another critical area where cored wire technology delivers value: maintenance and repair of steelmaking equipment itself. Continuous casting machines operate under extreme conditions—thermal shock, corrosion, mechanical wear, and oxidation. Nowhere are these conditions more severe than on the top rollers of the casting line, directly below the mold. Premature roller failure causes unscheduled downtime, surface defects on cast product, and significant maintenance costs. How can you dramatically extend the service life of these critical components? Wuxi WeiDa Cored Wire Co., Ltd. offers specialized hardfacing cored wires for continuous casting equipment maintenance.
The Top Roller Challenge: Extreme Conditions, Critical Function
In the upper section of a continuous casting machine, rollers face a uniquely demanding environment. They experience thermal shock from contact with hot strand. They're exposed to corrosive attack from mold fluxes containing fluorides and alkalis that accumulate in cooling water—a mechanism known as mold-flux-induced corrosion . They undergo oxidation at elevated temperatures. And they must withstand mechanical contact with the moving strand. Traditional overlay materials, while providing some protection, often fail prematurely under this combination of attacks.
Our Solution: Super-Martensitic Hardfacing Technology
Wuxi WeiDa offers specialized hardfacing cored wires engineered specifically for continuous casting roller applications. Our super-martensitic stainless steel wires provide an optimal balance of properties for top-zone rollers. Unlike classical martensitic types, super-martensitic grades offer significantly improved corrosion resistance while maintaining acceptable wear behavior .
The key characteristics of our hardfacing wires include:
•Martensite start temperature well above room temperature, ensuring complete transformation without retained austenite
• Delta ferrite content below 10%, optimizing the balance of properties
• Excellent slag release at typical operating temperatures of 300-350°C
• Minimal dilution effects from the base material, even after multiple layers
• Suitability for small roll diameters (150-300 mm) typical of top zones
Proven Results: Doubled Service Life
Field testing of super-martensitic overlays in continuous casting applications has demonstrated remarkable results. At Dillinger Hütte steel works in Germany, rollers overlaid with this technology achieved double the lifetime of conventional materials in the first segment of the casting line . This improvement translates directly to reduced maintenance downtime, lower consumable costs, and more stable casting operations.
Cost-Effective Protection
The hardness of our overlay materials—typically 36 HRC as-welded—provides excellent wear resistance while maintaining good machinability with metallic carbide tipped tools . This combination of wear protection and repairability makes our hardfacing solution both effective and economical.
If continuous casting roller life is a concern at your facility, Wuxi WeiDa's hardfacing expertise can help. Contact us through https://www.weidamaterials.com/ for more information.