News

— How It Helps Prevent Corner Cracks, Breakouts, and More

In the continuous casting process, the mould is often considered the “heart” of the caster, where molten steel begins to solidify into a slab. Among its components, the copper mould tube plays a critical role in heat transfer, lubrication control, and surface quality formation.

However, many steelmakers struggle with common defects such as corner cracks, breakouts, longitudinal cracks, and strand deformation, which not only affect product quality but also threaten production stability and equipment safety.

Improving the design and performance of the copper mould tube can be a decisive factor in mitigating these casting challenges.

Corner Cracks — Controlled Cooling at the Corners

Corner cracks often result from excessive or uneven cooling and thermal stress concentration at the slab corners.

1.Optimized Geometry Design

Smooth R-angle transitions reduce stress concentration in critical areas.

2.High Thermal Conductivity Cu-Ag Alloys

Ensures uniform heat removal and reduces thermal gradient-induced cracking.

3.Advanced Surface Coating

Cr-plating or composite coatings improve resistance to thermal fatigue and extend copper mould tube lifespan while maintaining casting stability.

Breakouts — A Matter of Lubrication and Shell Formation

Breakouts are frequently caused by lubrication failure or abnormal initial shell growth.

1.Laser-Welded High-Precision Copper Mould Tubes

Ensure inner wall accuracy and uniform mould flow, minimizing turbulent steel behaviour.

2.Micro-Textured Inner Surfaces

Enhance slag spreading and lubrication effectiveness, reducing risk of sticking and shell rupture.

3.Customized Flow-Guide Grooves

Control initial solid shell thickness and minimize the risk of thin shell breakouts.

What a High-Performance Copper Mould Tube Brings to the Table

Improved Feature / Casting Benefit

Higher Thermal Conductivity / More uniform cooling, fewer cracks or deformations

Enhanced Wear Resistance / Longer service life, less downtime

Optimized Mould Profile / Better strand quality, reduced surface defects

Upgraded Coating Technology / Greater resistance to thermal stress in high-speed casting/