What material is usually used for mold copper tubesThe mold copper tube is a very critical component, which is directly related to the performance of the conti

What material is usually used for mold copper tubes

The mold copper tube is a very critical component, which is directly related to the performance of the continuous caster and the quality of the cast slab. The common cause of continuous caster leakage and poor surface quality of the cast slab is a problem with the mold copper tube. Because the inside of the copper pipe is in contact with high-temperature molten steel, the temperature difference between the inner and outer surfaces of the copper pipe is large, the thermal stress is high, and it is extremely volatile. The shape of the inner cavity of the copper tube is very important. It is necessary to protect the shape of the inner cavity of the copper tube to match the shape of the crystalline solidified shell, so that the air gap can be small and uniform. Therefore, the copper tube material is required to have strong thermal deformation resistance, that is, it is required High recrystallization temperature, low thermal expansion coefficient, good thermal conductivity, high thermal fatigue strength, etc. The selection of copper tube materials develops in the direction of red copper → phosphorous deoxidized copper → silver copper → chromium zirconium copper. Because the recrystallizer temperature of chromium zirconium copper is the highest among the above materials, its resistance to thermal deformation is the strongest. However, due to its high cost, there are problems such as large rebound of copper tubes in the extrusion process. At present, there are not many domestic mold copper tubes used in manufacturing.