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 casting machine and the quality of the cast slab. The common cause of continuous caster leaks 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 inner cavity shape of the copper tube to match the shape of the crystal solidified blank shell to make the air gap 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, not many mold copper tubes are used in China.
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Harm of too high temperature: when molten steel out of cooper mold, the billet shell is thin and easy to break out; The accelerated erosion of refractory can ea
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1. The barrier function (mainly completed by the liquid slag layer) isolates the contact between air and molten steel, blocks the secondary oxidation of molten
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In continuous casting, low corrosion resistance often occurs, which directly leads to uneven composition and will eventually affect the smelting quality. In or