阅读说明：本技术 减少2机2流板坯连铸机中间包铸余的方法 (Method for reducing casting residue of tundish of 2-machine 2-flow slab continuous casting machine ) 是由 程锁平 张乔英 于 2019-10-11 设计创作，主要内容包括：本发明公开了一种减少2机2流板坯连铸机中间包铸余的方法,通过采用耐火材料在中间包的包底设置底部工作层,且在底部工作层上设置容纳钢水的钢水容置槽,钢水容置槽位于中间包水口的上方且钢水容置槽与中间包水口连通。本发明的减少2机2流板坯连铸机中间包铸余的方法,通过设置底部工作层,使得中间包能够在浇铸后期避免钢水涡流卷渣,减少中间包铸余,提高连铸钢水收得率；同时可以降低连铸尾坯卷渣,提高产品质量,降低生产成本。(The invention discloses a method for reducing casting residue of a tundish of a 2-machine 2-flow plate blank continuous casting machine, which is characterized in that a bottom working layer is arranged at the bottom of the tundish by adopting refractory materials, a molten steel containing groove for containing molten steel is arranged on the bottom working layer, the molten steel containing groove is positioned above a water gap of the tundish, and the molten steel containing groove is communicated with the water gap of the tundish. According to the method for reducing the casting residue of the tundish of the 2-machine 2-flow plate blank continuous casting machine, the bottom working layer is arranged, so that the tundish can avoid the eddy slag entrapment of molten steel in the later casting period, the casting residue of the tundish is reduced, and the yield of the continuous casting molten steel is improved; meanwhile, the slag of the continuous casting tail billet can be reduced, the product quality is improved, and the production cost is reduced.)

1. The method for reducing the casting residue of the tundish of the 2-machine 2-flow plate blank continuous casting machine is characterized in that a bottom working layer is arranged at the bottom of the tundish by adopting refractory materials, a molten steel containing groove for containing molten steel is arranged on the bottom working layer, the molten steel containing groove is positioned above a water gap of the tundish, and the molten steel containing groove is communicated with the water gap of the tundish.

2. The method of reducing 2-machine 2-stream slab caster tundish casting scrap according to claim 1 wherein the bottom working layer has a thickness of 20-30 cm.

3. The method of reducing 2-machine 2-stream slab caster tundish casting scrap according to claim 1 or 2 wherein the bottom working layer has a thickness of 20 cm.

4. The method of reducing 2-machine 2-stream slab caster tundish casting scrap according to any one of claims 1 to 3 wherein flow stabilizers are provided on the bottom work layer.

Technical Field

The invention belongs to the technical field of metal materials, and particularly relates to a method for reducing casting residue of a tundish of a 2-machine 2-flow plate blank continuous casting machine.

Background

In the final stage of pouring of a tundish of the slab continuous casting machine, when the liquid level of molten steel around a tundish submerged nozzle is reduced to be lower than the critical height of vortex, vortex is generated in the position area of the tundish submerged nozzle, so that tundish molten steel surface layer ladle slag and a covering agent enter a crystallizer, and casting blank slag entrapment is caused. In order to prevent the occurrence of the slag rolling accident of molten steel in the later pouring period of the tundish, steel enterprises can select that the liquid level of the molten steel in the tundish is higher than the critical height of the eddy current slag rolling when the pouring of the tundish is stopped, so as to avoid the eddy current slag rolling. Higher tundish molten steel can bring larger tundish casting residue, so that the molten steel yield is in a lower level.

The ladle bottom of the tundish of the existing 2-machine 2-flow slab continuous casting machine (2-machine 2-flow means that two continuous casting machines are arranged under one tundish, and the tundish is connected with the two continuous casting machines) is designed to be a rectangular horizontal bottom, when the critical height of eddy slag entrapment is ensured, the height of residual molten steel cast by the tundish is about 20-30cm, the weight is about 15 tons, and the residual molten steel is large, so that the yield of the continuous casting molten steel is low.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a method for reducing the casting residue of a tundish of a 2-machine 2-flow plate blank continuous casting machine, and aims to improve the yield of continuous casting molten steel.

In order to achieve the purpose, the invention adopts the technical scheme that: the method for reducing the casting residue of the tundish of the 2-machine 2-flow plate blank continuous casting machine is characterized in that a bottom working layer is arranged at the bottom of the tundish by adopting refractory materials, a molten steel containing groove for containing molten steel is arranged on the bottom working layer, the molten steel containing groove is positioned above a water gap of the tundish, and the molten steel containing groove is communicated with the water gap of the tundish.

The thickness of the bottom working layer is 20-30 cm.

The thickness of the bottom working layer is 20 cm.

And a current stabilizer is arranged on the bottom working layer.

According to the method for reducing the casting residue of the tundish of the 2-machine 2 flow plate blank continuous casting machine, the bottom working layer is arranged, and the molten steel containing groove is formed in the bottom working layer, so that the tundish can avoid the eddy slag entrapment of the molten steel at the later stage of casting, the casting residue of the tundish is reduced, and the yield of the continuous casting molten steel is improved; meanwhile, the slag of the continuous casting tail billet can be reduced, the product quality is improved, and the production cost is reduced.

Drawings

The description includes the following figures, the contents shown are respectively:

FIG. 1 is a schematic structural view of a tundish of a 2-machine flow slab caster;

labeled as: 1. a tundish retaining wall; 2. a tundish nozzle; 3. a tundish stopper; 4. a current stabilizer; 5. a tundish working layer; 6. a bottom working layer; 7. a molten steel accommodating groove.

Detailed Description

The following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings for a purpose of helping those skilled in the art to more fully, accurately and deeply understand the inventive concept and technical solution of the present invention and to facilitate its implementation.

As shown in figure 1, the invention provides a method for reducing casting residue of a tundish of a 2-machine flow plate continuous casting machine, a bottom working layer 6 is arranged at the bottom of the tundish by adopting refractory materials, a molten steel containing groove 7 containing molten steel is arranged on the bottom working layer 6, the molten steel containing groove 7 is positioned above a tundish water gap 2, and the molten steel containing groove 7 is communicated with the tundish water gap 2. By changing the method of the working layer of the tundish, the molten steel containing groove 7 is arranged for containing molten steel at the later stage of pouring, and the residual casting amount of the molten steel of the tundish is reduced by about 40% under the condition of not changing the critical height of vortex slag coiling, so that the residual casting amount of the molten steel of the tundish is controlled below 8 tons under the condition of not changing the critical height of vortex generation at the later stage of pouring.

Specifically, as shown in fig. 1, the bottom working layer 6 is horizontally disposed on the bottom of the tundish, the bottom working layer 6 is formed by using a refractory material to be laid on the bottom of the tundish, the bottom working layer 6 has a certain thickness, and the bottom working layer 6 covers the bottom of the tundish. The flow stabilizer 4 is arranged on the bottom working layer 6, the flow stabilizer 4 is fixedly arranged on the bottom working layer 6, the flow stabilizer 4 is arranged at the middle position in the length direction of the bottom working layer 6, the tundish retaining wall 1 is arranged in the tundish, and the flow stabilizer 4 is arranged between the two tundish retaining walls 1. The tundish nozzle 2 is arranged at the bottom of the tundish, the tundish nozzle 2 is arranged at the end part of the tundish in the length direction, the tundish nozzle 2 extends out towards the lower part of the tundish, and molten steel in the tundish flows out through the tundish nozzle 2.

The thickness of the bottom working layer 6 is 20-30 cm. Preferably, the thickness of the bottom working layer 6 is 20cm, and the thickness direction of the bottom working layer 6 is a direction perpendicular to the bottom of the tundish, namely, a vertical direction. As shown in fig. 1, the molten steel accommodating groove 7 is a groove which is formed in the bottom working layer 6 in a penetrating manner along the thickness direction of the bottom working layer 6, the depth of the molten steel accommodating groove 7 is the same as the thickness of the bottom working layer 6, the tundish nozzles 2 are positioned below the molten steel accommodating groove 7, the number of the molten steel accommodating grooves 7 is the same as the number of the tundish nozzles 2, two molten steel accommodating grooves 7 and two tundish nozzles 2 are arranged, the two molten steel accommodating grooves 7 are respectively arranged at two ends of the bottom working layer 6 in the length direction (the length direction of the bottom working layer 6 is parallel to the length direction of the tundish), each tundish nozzle 2 is positioned below one molten steel accommodating groove 7, and the flow stabilizer 4 is positioned at the middle position of the two molten steel accommodating grooves 7.

After the continuous casting ladle is cast, molten steel is poured into a flow stabilizer 4 in the tundish through a long water gap, along with the casting, the molten steel overflows the flow stabilizer 4 and extends into the tundish and reaches the area of a tundish water gap 2, when the tonnage of the molten steel in the tundish reaches 25 tons, a tundish stopper rod 3 is opened, and the molten steel enters a crystallizer through the tundish water gap 2 to start continuous casting. And after the pouring of a pouring ladle is arranged according to the production plan, the tundish starts to perform a final-stage pouring mode. At the moment, in the later stage of continuous casting, the weight of molten steel in the tundish and the height of the liquid level are gradually reduced, the continuous casting controls the casting speed, when the weight of the molten steel in the tundish is reduced to a set value, the height of the molten steel in the casting area of a tundish water gap 2 of the tundish is 20-30cm, namely the molten steel fills the two molten steel accommodating grooves 7, the height of the molten steel in the molten steel accommodating grooves 7 is 20-30cm, and the height is still higher than the critical height generated by the vortex on the surface of the molten steel, so that the residual tonnage of tundish casting is reduced, and the risk of vortex slag entrapment is controlled.

The set value is 6.9 to 7.1 tons, and the depth of the molten steel accommodating groove 7 is preferably 20 cm.

The invention is described above with reference to the accompanying drawings. It is to be understood that the specific implementations of the invention are not limited in this respect. Various insubstantial improvements are made by adopting the method conception and the technical scheme of the invention; the present invention is not limited to the above embodiments, and can be modified in various ways.