The continuous casting and rolling process is divided into direct hot rolling of the billets and direct rolling of the slabs. The former is that the billet does not pass through the heating furnace, but is only heated by the electromagnetic induction device, and then directly sent to the rolling mill for rolling; the latter is that the billet does not need to be heated or supplemented, and is directly sent to the rolling mill for rolling.
The heating furnace is omitted, the fuel consumption of the heating furnace is eliminated, and energy saving and emission reduction are realized. The economic benefits, environmental benefits, and social benefits are very obvious.
It avoids the burning loss of the cast slab caused by staying in the heating furnace for a long time and improves the yield of steel products.
Reduced furnace operating and maintenance costs.
The implementation of the continuous casting and rolling production process involves the coordinated operation of melting, continuous casting, and rolling mill processes, consistent quality assurance, reliability of electromechanical equipment, production scheduling, and enterprise management mechanism, etc. It is a comprehensive system engineering. The key points of the process mainly include the following four aspects.
Continuous casting and rolling require that the slab be sent to the rolling mill as hot as possible, which requires the quality of the billets to be stable, including the control of the composition of the slab and the stability of the surface quality control, which is the key technology in the continuous casting and rolling process.
The core of continuous casting and rolling technology is to quickly transport the high-temperature castings to the rolling mill, so as to reduce the heat loss in the intermediate links as much as possible. There are two requirements for this. One is that the temperature must be high enough after the continuous casting is cut; the other is that the cut billets or slabs are quickly transported to the rolling mill for rolling, and insulation measures must be taken if necessary. This is a prerequisite for implementing the continuous casting and rolling process.
After the continuous casting slab is cut, the single-strand single-roller conveying method is adopted to quickly transport the slab to the rolling area, minimizing heat loss, and thereby reducing power consumption loss caused by electric furnace supplementary heat.
The temperature drop rate after continuous casting cutting is about 25°C/min, while the maximum temperature at the low-temperature end of the continuous casting slab after cutting does not exceed 1000°C. This requires that the cut continuous casting slab must be transported to the rolling mill side as soon as possible for rolling.
In the continuous casting and rolling process, there is no intermediate buffer link. During the production process, when conditions change, all processes must be coordinated to ensure smooth production.
Continuous casting and rolling is a rigid production process. Any problem in any link will disrupt the continuity of the entire production process. Therefore, the equipment in each process must ensure stable operation, and faults must be eliminated in time to ensure smooth production and efficiency.
The continuous casting and rolling process is a systematic project involving the entire production process from smelting, and casting to rolling. This requires iron and steel enterprises to combine their own characteristics, carry out processes according to local conditions, and continuously improve the management level and automation level of enterprises so that this technology can create the greatest possible benefits for enterprises.
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