Mold copper tube is the core part of continuous caster, which plays the role of solidification of molten steel. Copper tube plays an important role in improving casting efficiency and steel quality. Mould tubes function is to receive molten steel and allow rapid heat transfer from the molten steel to the cooling water for rapid solidification. Mold needs to have good thermal conductivity, thermal corrosion resistance, and thermal stress deformation resistance.
Metallurgy of Copper Mould Tubes | |||
Material | Cu-DHP | Cu-Ag | Cu-Cr-Zr |
High Phosphorus Deoxidized Copper | Cu-Ag (Cu-0.1Ag) | Cu-Cr-Zr (Cu-0.6Cr-0.15Zr) | |
Properties | Normal Deoxidized Copper | Through the addition of about 0.1% silver,strength is significantly enhanced with no loss in thermal conductivity | Cr and Zr precipitation hardening provides this alloy with high strength, high resistance to heat, and thermal conductivity |
Melting point | 1083ºC | 1083ºC | 1078ºC |
Coefficient of thermal expansion at 20ºC | 1.68*10-5 | 1.68*10-5 | 1.70*10-5 |
Thermal | 340w(m.K) | 377w(m.K) | 325w(m.K) |
Recrystallization | 330ºC | 370ºC | 700ºC |
Hardness at 20ºC | Min.85HB | Min.90HB | Min.120HB |