Method for hoisting, roasting and casting strip continuous casting flow distribution device

Abstract

The invention discloses a method for hoisting, roasting and casting a strip continuous casting flow distribution device. The method comprises the following steps that: 1) the flow distribution device is arranged at two ends of the bottom of a tundish vehicle through a hanging mechanism, a distributor is arranged at the bottom of the tundish vehicle and inserted into the flow distribution device, and the tundish vehicle drives the flow distribution device and the distributor to move up and down; 2) during roasting, a roasting pit has an independent temperature control system, and gas nozzles are arranged on the periphery inside the roasting pit; 3) hot charging is performed after roasting is finished; and 4) after the tundish vehicle, the hanging mechanism and the flow distribution device reach a casting position, the hanging mechanism hangs the flow distribution device to descend together, and places the flow distribution device on a bracket of the flow distribution device of the roasting pit, and then the hanging mechanism is separated from the flow distribution device for molten steel to inject. By the method, the time of strip continuous casting hot charging process can be effectively reduced, so that temperature drop of the flow distribution device in the process of hot charging is reduced, the problem that cold steel is easy to form when the high-temperature molten steel is contacted with the flow distribution device can be effectively avoided, and the success rate of strip continuous casting pouring is improved; the method is convenient to operate and the hot charging step is convenient to implement at the same time; and a heating furnace can also be saved and field resources are greatly saved.

Description

technical field [0001] The invention relates to the field of thin strip continuous casting, in particular to methods for hoisting, baking and casting of a suspender type flow distributor for thin strip continuous casting. Background technique [0002] In recent years, domestic and foreign research activities on the development of direct casting technology for steel strip (that is, near-net-shape processing technology for strip steel) have become more and more active, and the fastest growing technology is twin-roll thin strip continuous casting technology. The twin-roll strip continuous casting technology was first proposed by Henry Bessemer in 1865 (US Patent: 49053). Thin strip continuous casting integrates continuous casting, rolling, and even heat treatment into one process, so that the produced thin strip can be rolled into industrial products at one time, which greatly simplifies the production process from molten steel to steel strip and shortens the production process...

AI Technical Summary

Problems solved by technology

"Cold steel" continues to grow, and when its weight reaches a certain level, it will fall into the molten pool. Due to its large size and a very short stay in the molten pool, it will not remelt immediately. Rotating, large "cold steel" will cause damage to the roll surface of the crystallization roll; large "cold steel" passing through the roll gap will cause a surge in rolling force and make the casting process unstable; larger "cold steel" will wear When passing through the roll gap, the gap value of the roll gap increases instantaneously, causing the matching point ("KISS" point) to move down, and there may be a risk of belt breakage

[0008] (3) The "crust" of the liquid surface, because the molten steel forms "cold steel" around the outer wall of the flow distributor, the liquid surface will become relatively calm, thereby reducing the fluidity of the molten steel on the surface of the molten pool and the temperature of the surface of the molten pool, so that It is easy to cause the cold steel on the outer wall of the flow distributor to contact the surface of the crystallization roller, which we call "bridge", which results in the phenomenon of "crusting" on the liquid surface

Sometimes the impact caused by this "crust" phenomenon on the liquid surface may be fatal, mainly including: a) Due to the appearance of "crust" on the liquid surface, it will interfere with the molten steel level detection system in the molten pool, resulting in inaccurate Obtain the actual value of the liquid level; b) Due to the appearance of "crusting" on the liquid surface, when the situation in a) occurs, the closed-loop system of the molten steel level in the molten pool cannot work normally, resulting in violent fluctuations in the molten steel level, which is extremely dangerous. May lead to serious accidents such as spilled steel or broken belt

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