The coppermold tubeis a very important part, which is directly related to the performance of continuous caster and the quality of billet.The common cause of the
The coppermold tubeis a very important part, which is directly related to the performance of continuous caster and the quality of billet.The common cause of the leakage of continuous caster and the poor surface quality of billet is the problem of the copper pipe of mold.Due to the contact between copper tube and high temperature molten steel, the temperature difference between inside and outside surface of copper tube is large, the thermal stress is high and the variability is extremely high.
The shape of the copper tube cavity is very important, to protect the shape of the copper tube cavity and the solidification of the billet shell shape, in order to make the air gap is small and uniform, so the copper tube material has strong thermal deformation resistance, that is, high recrystallization temperature, small thermal expansion coefficient, good thermal conductivity, high thermal fatigue strength.
The selection of copper tube material along the direction of copper → phosphorus deoxidized copper → silver copper → chromium zirconium copper development, because the recrystallization temperature of chromium zirconium copper is the highest in the above several materials, so its thermal deformation resistance is the strongest.However, due to its high cost and the large amount of copper pipe rebound in extrusion process, there are not many domestic mold copper pipe manufacturing.
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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