What are the materials used for the mold copper tube?The inside of the copper pipe is in contact with high-temperature molten steel, resulting in a large tempe

What are the materials used for the mold copper tube?

The inside of the copper pipe is in contact with high-temperature molten steel, resulting in a large temperature difference between the inner and outer surfaces of the copper pipe, high thermal stress, and variability. The shape of the inner cavity of the copper tube is very important. Only when the shape of the inner cavity of the protective copper tube is consistent with the shape of the crystalline solidified blank shell can the air gap be small and uniform. Therefore, copper pipe materials are required to have strong thermal deformation resistance, that is, high crystallization temperature, small thermal expansion coefficient, good thermal conductivity, and high thermal fatigue strength. The choice of copper tube materials develops in the direction of red copper→phosphorus deoxidized copper→silver copper→chromium zirconium copper. Since the recrystallization temperature of chromium zirconium copper is the highest among the above-mentioned materials, it has the strongest resistance to thermal deformation. However, due to its high cost and the large rebound of copper tubes during the extrusion process, there are not many domestic mold copper tube manufacturing applications.