Square billet continuous casting multi-flow tundish sizing casting starting casting method

Abstract

The invention discloses a square billet continuous casting multi-flow tundish sizing casting starting casting method, which is characterized in that in the casting process, a first flow, a second flow, a seventh flow and an eighth flow are blocked by blocking cones, stuffing sand is poured on the first flow, the second flow, the seventh flow and the eighth flow, and the four middle flows do not need to be blocked by the blocking cones and are not filled with the stuffing sand, that is, the four middle flows of a tundish are also directly cast after a large ladle is cast; the steel flow which just flows down and diverges is received by the swing groove, and when the steel flow has force and is full, the swing groove is pulled open to be injected into the crystallizer for casting; a ladle sliding nozzle is opened to enable the nozzle to reach full flow, and a ladle casting worker needs to lift the liquid level of the tundish to the height during normal casting within 3 minutes; four flows in the middle of the casting sequence are simultaneously cast, the pulling speed is manually adjusted and the crystallizer is slowly lifted after flow injection is started, the pulling speed is directly switched to be automatically controlled after the liquid level of the crystallizer reaches a set liquid level value and is stable, an operator installs a submersed nozzle, and the first flow and the eighth flow are simultaneously cast in the process of installing the nozzle; and after normal casting is started, casting the second flow and the seventh flow.

Description

technical field [0001] The invention relates to a starting casting method for billet continuous casting multi-strand tundish sizing pouring. Background technique [0002] The diversification of continuous casting varieties and the increasingly stringent market requirements for steel quality force the continuous casting process to be further optimized. The outdated open pouring method can no longer meet the requirements, and the more popular protective pouring method is stopper control combined with submerged nozzle pouring. Its disadvantages are high refractory cost, low tundish life, short continuous casting time, and The yield is low. Moreover, the control of the stopper rod is mostly controlled manually, which has the disadvantages of unstable instantaneous molten steel flow, large fluctuations of molten steel in the crystallizer, and easy slag rolling. In addition, the stopper rod head is washed out to cause missing (notch), or adhesion inclusions etc., the flow is pro...

AI Technical Summary

Problems solved by technology

The outdated open pouring method can no longer meet the requirements, and the more popular protective pouring method is stopper control combined with submerged nozzle pouring. Its disadvantages are high refractory cost, low tundish life, short continuous casting time, and low yield

The swing trough is installed on the beam at the bottom of the tundish car and is made of steel structure. The high-temperature molten steel coming down from the sizing nozzle of the tundish during pouring will cause splashes in the swing trough and when the swing trough is swung in and out, which will not only cause the surrounding The safety risk of personal burns, and it will affect the safe use of surrounding equipment

[0004] Literature search: The search found that the paper "Application of Billet Sizing Ladle Continuous and Steady-state Production Technology" was published in "Laiwu Steel Technology" 2015 No. 5, "Continuous Casting Tundish Sizing Nozzle Continuous Flow Rapid Replacement Technology" was published in " Laiwu Steel Science and Technology, No. 1, 2000, "Application Practice of Billet Continuous Casting High-speed Automatic Opening Technology", "Guangxi Energy Conservation", No. 1, 2021, etc. sizing pouring technology literature, did not retrieve 8 machines and 8 strands The Technology of Start-up Casting of Sizing Casting in Tundish