1. The thickness of the blank shellThe heat transfer in the first cooling process in crystallizer is mainly the heat transfer along the normal direction of the
1. The thickness of the blank shell
The heat transfer in the first cooling process in crystallizer is mainly the heat transfer along the normal direction of the copper mould tube, which is a one-dimensional conduction heat transfer process after simplification. According to the law of heat transfer, the thicker the billet mould shell, the greater the heat transfer resistance of the cast slab from the inside to the outside, resulting in a decrease in heat transfer as the thickness of the cast slab solid shell increases; on the contrary, the thinner the billet mould shell, the smaller the thermal resistance and the heat conduction The larger the amount.
2. Mold powder thickness and performance:
The thermal resistance of non-metallic mold powder is very large, and its performance and thickness have a very large impact on conduction and heat transfer in crystallizer.
3. Air gap
This air gap mainly refers to the gap between the solid mold powder and the copper mould tube wall. The gaseous substances in the air gap are mainly nitrogen and hydrogen. The air gap leads to a great increase in thermal resistance in crystallizer, which is the largest influencing factor of thermal resistance in the entire cold heat transfer process.
4. Copper mould tube thickness
The thickness of copper mould tubes with different specifications and sections is different. According to the law of heat conduction, a copper mould tube with a large thickness has a large thermal resistance, and under the same thermal conductivity, the heat transferred is small.
The above-mentioned heat conduction factors are the heat transfer factors in our first cooling process in crystallizer. The thickness of the blank shell will inevitably increase with time; the thickness and performance of the mold powder are consistent under the same working conditions, which is impossibly changed.
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