Secondary cast-on process for continuous-casting tundishes

Abstract

The invention relates to a secondary cast-on process for continuous-casting tundishes and belongs to the technical field of continuous casting of the metallurgical industry. According to the technical scheme, the process comprises the steps that (1), before casting of the tundishes is stopped, slagging treatment is conducted on the tundishes; (2), when the liquid steel level of the tundishes remains at 200 mm, the remaining one to two middle streams of water gaps are cast continuously; (3), when the tundish liquid steel level is at 10-20 mm, casting of the tundishes is stopped; (4), the tundishes are baked, the baking temperature ranges from 1,100 DEG C to 1,300 DEG C, and the baking time ranges from 45 minutes to 180 minutes; (5), after baking of the tundishes is completed, liquid steel in steel ladles is injected into the tundishes; and (6), the liquid steel level of the tundishes is greater than 300 mm, and secondary casting is conducted on the tundishes. The secondary cast-on process has the beneficial effects that the temperature loss of the tundishes is reduced, the service life of the tundishes is guaranteed, the consumption of continuous-casting refractory is lowered, and the smooth production of iron and steel enterprises is guaranteed.

Description

technical field [0001] The invention relates to a continuous casting tundish secondary pouring process, in particular to a billet continuous casting tundish secondary pouring process, belonging to the continuous casting technical field of the metallurgical industry. Background technique [0002] In the steelmaking production of the metallurgical industry, the tundish is the intermediate link of the steelmaking production process, and it is also the transition point from intermittent operation to continuous operation. Regardless of whether it is for the smooth progress of continuous casting operations or for ensuring that the quality of molten steel meets the requirements, the role of the tundish cannot be ignored. The function of the tundish is to stabilize the temperature of the molten steel, to make the molten steel inclusions float up, and to ensure the smooth running of the continuous casting when there is a short-term shortage of molten steel or when the ladle is replac...

AI Technical Summary

Problems solved by technology

If a new tundish is replaced at this time, the service life of the tundish will be reduced, and according to the new tundish baking rules, replacing a new tundish will take more than 10 hours for steelmaking to resume production, resulting in blast furnace wind reduction or even The wind has seriously affected the production of iron and steel enterprises, especially the production of ordinary carbon steel. This situation is more prominent