Some Common problems of Copper Mold Tube 1. What is the reason for the large fluctuation of crystallizer surface up and down during steel pouring?A: it is es
Some Common problems of Copper Mold Tube
1. What is the reason for the large fluctuation of crystallizer surface up and down during steel pouring?
A: it is estimated that it is caused by heat flow. It shows that the steel body is uneven and the temperature fluctuates greatly.
2. Analyze the crystallization process, phase composition and microstructure of 45 steel and T10 Steel at room temperature under slow cooling, and calculate the relative amount of microstructure at room temperature.
A: 45 steel is hypoeutectoid steel and T10 steel is hypereutectoid steel. Refer to engineering materials (4th Edition) 78, 79 for crystallization process and microstructure.
3. Why use soft water for continuous casting crystallizer?
A: the water flow rate in the crystallizer (generally considered as 6-10m / s) must ensure that the heat of the copper wall of the copper pipe of the crystallizer is taken away to avoid accumulation and increase the temperature of the copper wall. If the copper wall temperature exceeds 100 ℃, there will be water boiling. The surface of the copper plate is covered with water bubbles and scale deposition, which worsens the heat transfer of the crystallizer. Therefore, the crystallizer must use soft water.
4. Some problems of copper mold tube: the decisive factor of material selection. Due to the contact between the inside of the copper pipe and 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 very variable. The inner cavity shape of the copper pipe is very important. To ensure that the inner cavity shape of the copper pipe is consistent with the shape of the green shell solidified by crystallization, the air gap can be small and uniform. Therefore, the copper pipe material is required to have strong thermal deformation resistance, high recrystallization temperature, small thermal expansion coefficient, good thermal conductivity and high thermal fatigue strength.
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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