General knowledge of copper mould tubeShape featuresThe appearance shape of copper mold tube is generally square pipe or copper pipe bent to one side, and the
General knowledge of copper mould tube
Shape features
The appearance shape of copper mold tube is generally square pipe or copper pipe bent to one side, and the inner cavity is conical from top to bottom, which is divided into two conical surfaces, three conical surfaces or multiple conical surfaces. In the process of casting embryo solidification, the shape of the inner cavity of the copper mould tube is consistent with the shrinkage law of the embryo shell during solidification, so as to reduce the thermal resistance of the gap between them.
Determinants of material selection
Due to the contact between the inside of the copper mould tube and high-temperature molten steel, the temperature difference between the inner and outer surfaces of the copper tube is large, the thermal stress is high, and it is very easy to change. The inner cavity shape of the copper tube is very important. To ensure that the inner cavity shape of the copper mould tube is consistent with the shape of the green shell solidified by crystallization, the air gap can be small and uniform. Therefore, the copper mould tube material is required to have strong thermal deformation resistance, that is, it is required to have high recrystallization temperature, small thermal expansion coefficient, good thermal conductivity and high thermal fatigue strength.
Nickel plating of cobalt tungsten alloy inside and outside the crystallizer copper tube - electroplating process
General knowledge of copper mould tube: a nickel cobalt tungsten alloy coating with a thickness of 0.5mm is plated on the inner and outer surface of copper mould tube, and then a hard chromium coating with a thickness of 0.08-0.12mm is plated after grinding and polishing. The central technology of the process is to use hollow profiling anode, and many small holes are opened on the surface of profiling anode. During plating, the circulating pump is used to spray the plating solution indirectly to the surface of cathode through hollow anode, so that metal ions can accumulate rapidly on the surface of cathode under the action of electric field.
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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