How to Avoid Cracking of Monoblock Stopper Rods in Continuous Casting
The monoblock stopper rod is a critical flow-control refractory component used in modern continuous casting operations. Installed in the tundish, it regulates molten steel flow into the submerged entry nozzle (SEN) by precise vertical movement. Compared with traditional multi-piece stopper systems, monoblock stopper rods offer advantages such as improved structural integrity, better sealing performance, and more stable casting control.
tundish Stopper
However, cracking of monoblock stopper rods remains one of the most common and serious operational problems. Cracks can lead to premature failure, unstable flow control, steel leakage, casting interruptions, and even major safety incidents. As casting speeds increase and steel cleanliness requirements become more stringent, preventing stopper rod cracking has become a key concern for steelmakers and refractory engineers.
This article provides a comprehensive analysis of why monoblock stopper rods crack and, more importantly, how to avoid cracking through proper design, material selection, manufacturing control, installation, and operation.
