Method for eliminating flocculating flow blocking of upper nozzle of tundish

Abstract

The invention discloses a method for eliminating flocculating flow blocking of an upper nozzle of a tundish. After replacement of a submersed nozzle in a flocculating flow state is invalid, a casting blank is pulled to a fast replacement position, a stopper rod is temporally closed to interrupt casting, a half submersed nozzle is used for replacing the original submersed nozzle obtained after flocculating flow blocking, oxygen is used for burning off inclusion in the upper nozzle of the tundish, then a new submersed nozzle is used for replacement, the stopper rod is opened to enable molten steel to smoothly flow down, and casting operation continues to be carried out. According to the method, the inclusion accumulated in the upper nozzle of the tundish is effectively removed so that the molten steel can be smoothly cast down through the upper nozzle; according to the method, damage of the long time and the low pull speed to equipment is eliminated, the equipment is protected to the largest degree, and the inner quality and outer quality of the subsequent casting blank are guaranteed; according to the method, flocculating flow blocking of the upper nozzle of the tundish can be eliminated within a short time, shutdown accidents are avoided, and production cost is greatly reduced; and the method is high in operability, safe, reliable and remarkable in application effect.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a method for eliminating flocculation blockage of a nozzle on a tundish. Background technique [0002] At present, in the continuous casting production process, due to improper treatment of molten steel in individual furnaces, excessive oxidation of molten steel, and too many inclusions, the nozzle is easily blocked by flocculation. Pulling speed limit, in order to protect equipment and prevent accidents from expanding, post workers generally choose to shut down. [0003] The main problems of this approach are: 1. Shutdown accidents disrupted the original production plan, resulting in the failure to realize the planned fulfillment rate; 2. Reheating and alloying treatment of the remaining molten steel in the large bag returned to refining, consuming a lot of electricity and alloy costs, At the same time, the tundish tundish produces a large amount of scrap stee...

AI Technical Summary

Problems solved by technology

[0002] At present, in the continuous casting production process, due to improper treatment of molten steel in individual furnaces, excessive oxidation of molten steel, and too many inclusions, the nozzle is easily blocked by flocculation. Pulling speed limit, in order to protect equipment and prevent accidents from expanding, post workers generally choose to stop

[0003] The main problems of this approach are: 1. Shutdown accidents disrupted the original production plan, resulting in the failure to realize the planned fulfillment rate; 2. Reheating and alloying treatment of the remaining molten steel in the large bag returned to refining, consuming a lot of electricity and alloy costs, At the same time, the tundish tundish produces a large amount of scrap steel, resulting in a huge waste of cost; 3. The low casting speed water change port has a certain impact on the equipment, and has a certain impact on the internal and external quality of the subsequent slab