New Ladle Patching Material Technology: Extend Steel Ladle Service Life and Reduce Refractory Consumption

New Ladle Patching Material Technology: Extend Steel Ladle Service Life and Reduce Refractory Consumption

Steel ladles are essential vessels used in the steelmaking process for carrying and transporting molten steel at extremely high temperatures. The ladle lining is continuously exposed to harsh operating conditions such as high temperature, thermal shock, molten steel erosion, and slag corrosion, which often lead to localized damage.

At present, ladle linings are mainly constructed with refractory materials such as magnesia-carbon bricks and magnesia-alumina-carbon bricks. During operation, the steel-contact area and slag line area experience different levels of erosion and wear caused by molten steel and slag, resulting in localized thinning, spalling, grooves, and pits that ultimately shorten the overall service life of the ladle lining.

Traditional repair methods generally rely on brick replacement, which requires intensive labor and often creates weak bonding areas between old and new bricks. These weak points may increase the risk of steel leakage and reduce operational safety. Therefore, developing a convenient and reliable repair material has become an important solution for extending ladle life.

To address these challenges, Beijing United Rongda Engineering Materials Co., Ltd. has developed a new ladle patching material specifically designed for repairing vulnerable areas of ladle linings. The material is typically applied during porous plug replacement, intermediate repair, or slag line maintenance. It features easy application, efficient construction, and excellent refractory performance.

The new ladle patching material is mainly composed of white fused alumina, high-purity magnesia, and alumina micropowder, combined with a cement bonding system. By optimizing particle gradation, the material can evenly fill gaps without vibration during application, forming a dense and stable repair layer. It offers excellent resistance to erosion, corrosion, and high-temperature impact while maintaining strong adhesion and minimizing spalling during operation.

Industrial practice shows that the optimal application thickness is approximately 20–30 mm. Excessive thickness may lead to incomplete sintering and peeling, while insufficient thickness may not provide significant life extension benefits. Under normal operating conditions, a single application can extend ladle service life by 15–25 heats, significantly reducing maintenance frequency and lowering refractory material consumption by more than 20%.

In an industrial trial conducted on a 120-ton refining ladle at a steel plant, the average service life of the ladle wall bricks was approximately 160 heats before using the patching material. After applying the material during both minor and intermediate repairs, the service life increased to 210 heats, demonstrating remarkable performance improvement.

Overall, the new ladle patching material technology effectively solves problems such as severe local erosion, cracks, and pits in ladle linings. It not only extends the overall service life of steel ladles but also reduces premature intermediate repairs caused by localized damage. The technology plays an important role in helping steel plants achieve energy savings, cost reduction, and stable production operations.