Continuous casting start casting operation method for square billets

Abstract

The invention discloses a continuous casting start casting operation method for square billets, and belongs to the technical field of continuous casting operation methods. The continuous casting start casting operation method for the square billets aims at solving the problem that when start casting is performed, the billet drawing resistance is large due to the fact that initial billet shells and the crystallizer wall are prone to being bonded, so that the length of the billet shells in a crystallizer is too large and the strength of the billet shells in the crystallizer is too high. The method comprises the steps that 1, a dummy bar head is inserted into the crystallizer, and tundish start casting is performed; 2, a vibrating table is started; 3, a withdrawal and straightening machine is started and runs at the starting withdrawal speed; 4, the withdrawal speed of the withdrawal and straightening machine is steadily increased to the normal withdrawal speed. According to the continuous casting start casting operation method for the square billets, accidents such as withdrawal disengagement, withdrawal breakage and steel leakage are prevented from occurring, the effects are significant, the start casting production accidents are significantly reduced, and the method is suitable for being used for continuous casting start casting of the square billets, especially small square billets.

Description

technical field [0001] The invention specifically relates to a billet continuous casting and pouring operation method, and belongs to the technical field of continuous casting operation methods. Background technique [0002] As a key technological process in the production process of steelmaking plants, continuous casting is of great significance to ensure the continuity of the entire production process and improve production efficiency and product quality. As a key operation of continuous casting production, casting machine start-up directly determines whether continuous casting production can proceed smoothly. Chinese patent application CN1724190A discloses a continuous casting start-up method. By optimizing the start-up sequence, the purpose of avoiding the freezing nozzle and improving the success rate of start-up is achieved. This method can only improve the temperature drop of molten steel in the tundish, but if the Unreasonable pouring operation methods will cause ac...

AI Technical Summary

Problems solved by technology

[0003] Therefore, the object of the present invention is to provide an operation method for continuous casting of square billets. In order to overcome the fact that the primary billet shell is easily bonded to the wall of the crystallizer during casting, the length of the billet shell in the crystallizer is too long and the strength is too high to cause the billet to be drawn. For problems with high resistance, the method is:

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