Continuous steel billet casting process and apparatus

Abstract

The present invention discloses continuous steel billet casting method and apparatus. The method is setting inert gas protected area with certain inert gas pressure maintained between the pouring basket and the crystallizer of the continuous casting apparatus. The continuous steel billet casting apparatus includes a pouring basket, a crystallizer, a vibration mechanism, a secondary cooling area, a withdraw unit, a bending unit, an curved track and a straightener. Between the pouring basket and the crystallizer, is set one inert gas protecting cover with cylindrical cover, sliding sleeve and gas inlet. The present invention can raise the quality of the thin steel billet and avoid the blocking of the inlet of the crystallizer cause by molten steel.

Description

technical field [0001] The invention relates to a thin slab continuous casting method and a continuous casting device used in the method, especially the continuous casting of small-sized thin slabs. Background technique [0002] The current small-sized thin slabs have the following disadvantages in the continuous casting process: [0003] 1. Small-sized thin slabs are generally not protected during continuous casting, which will cause secondary oxidation of molten steel. Sometimes shroud mold slag is used to protect pouring, but shrouds made of refractory materials and The molten steel forms non-metallic oxide inclusions, and if the mold slag is not properly selected, new non-metallic impurities will be produced in the molten steel. These non-metallic impurities will damage the quality of the thin slab, and the price of the mold slag is relatively expensive. [0004] 2. During the pouring process of molten steel, the molten steel will appear scattered flow. The molten steel...

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Problems solved by technology

[0003] 1. Small-sized thin slabs are generally not protected during continuous casting, which will cause secondary oxidation of molten steel. Sometimes shroud mold slag is used to protect pouring, but shrouds made of refractory materials and The molten steel forms non-metallic oxide inclusions. At the same time, if the mold slag is not properly selected, new non-metallic impurities will be produced in the molten steel. These non-metallic impurities will damage the quality of the thin slab. In addition, the price of the mold slag is relatively expensive.

[0004] 2. During the pouring process of molten steel, the molten steel will appear scattered flow. The molten steel on both sides of the inner hole on the upper plane of the current small-sized continuous casting thin slab crystallizer quickly solidifies upwards and inward until the inner hole is blocked. Molten steel pouring cannot be carried out

[0005] 3. The current crystallizer is generally lubricated with lubricating oil, but due to uneven oil supply in the oil circuit, it is easy to cause sticking between the billet shell and the cavity of the crystallizer during pouring, resulting in leakage and shutdown accidents

[0006] 4. Nowadays, the general alignment method adopts the stick alignment method. This method is relatively simple, but the accuracy of this alignment method is poor, which will cause uneven thickness of the shell of the liquid core in the crystallizer, increase the resistance of the casting, and affect the casting speed. In severe cases, there will be leakage, which will cause production stoppage, and will affect the internal quality of the thin slab, causing tissue segregation and composition segregation

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