CN206536025U - A kind of tundish cover of continuous casting tundish with Argon function - Google Patents

Abstract

The invention relates to a continuous casting tundish cover with argon blowing function, which belongs to the technical field of continuous casting tundish equipment and is used for realizing the complete isolation of molten steel and air in the tundish. The technical solution is: two argon main pipes are arranged between the supporting ribs of the cover, and the two argon main pipes are respectively connected to the argon pipes on the tundish car through quick joints, and one argon main pipe is connected to the There are multiple exhaust branches, the gas outlets of the multiple exhaust branches face the bottom of the tundish, and the other main argon gas pipeline is connected with multiple protection branches, and the gas outlets of the protection branches are respectively connected to the reserved parts of the cover. The circular holes are opposite to each other. The utility model has the advantages of simple structure, convenient use and good effect of argon blowing. Before the ladle is poured, argon gas can be filled into the tundish to discharge the air. During the pouring process, an argon gas curtain is formed at the round hole of the cover to isolate the tundish. The outside air, thus realizing the real full protection pouring, improving the purity of the tundish molten steel and improving the pass rate of the final product.

Description

A continuous casting tundish cover with argon blowing function

technical field

The utility model relates to a continuous casting tundish cover with argon blowing function in the continuous casting process, which belongs to the technical field of continuous casting tundish equipment.

Background technique

Facing the increasingly severe market situation, the development of high value-added products such as automobile sheets and the improvement of product quality have become the goals pursued by many iron and steel enterprises, and the production of clean steel is the basis and effective means to achieve this goal. The production of clean steel is a systematic project, and every process link must be controlled in place.

The protective gating control of the continuous casting process is an important link to ensure that the molten steel will not be polluted again. The previous protective gating measures include the use of ladle long nozzles with argon gas seals, tundish covering agents, mold powders and submerged nozzles. These materials and The measures can ensure that the cast slab after the second pouring time meets the purity requirements, but when the pouring is just started, because the empty tundish is filled with air, the high-temperature molten steel will be oxidized again as soon as it enters the tundish, and the steel Al, Ti and other easily oxidizable elements in the water react with oxygen in the air to form inclusions such as Al ₂ O ₃ , which reduces the purity of molten steel. This part of molten steel is poured into the first billet, and after hot rolling into coils, There are often defects such as slag inclusions on the surface, which makes the reduction rate of the first coil produced by the first cast billet very high. According to statistics, the reduction rate of the first coil is as high as 15%.

In order to further improve the pass rate of the product, it is necessary to add a new control method to the above protective pouring measures, and to discharge the air in the tundish before the molten steel enters the tundish every time the continuous casting starts. Therefore, people thought of opening the pouring and filling the tundish with argon to discharge the air, and manually inserting a few pipes from the opening on the tundish cover to fill the tundish with argon. However, in the actual production process, it often happens that the operator forgets to insert the pipe before pouring, and inserting the pipe requires a person to stand on the hot-baked bale cover and face the high temperature of about 1200°C after the tundish is baked. , the working environment is very poor and dangerous, the operator can only stay in this environment for a short time, and the argon blowing tube inserted in a hurry is often in a skewed state, which often causes the argon to not blow to the bottom of the bag, and the effect of exhausting the air is very poor It is not ideal, so it is very necessary to improve the existing method of manually inserting the argon blowing tube to exhaust the air.

Utility model content

The technical problem to be solved by the utility model is to provide a continuous casting tundish cover with argon blowing function, which can ensure that the air in the tundish is discharged before the continuous casting starts, and the During the process, an argon gas curtain is formed to isolate the air outside the tundish, realize the complete isolation of the molten steel and the air in the tundish, further improve the good effect of the protection pouring effect, realize the real whole process protection pouring, and improve the qualified rate of the product.

The technical scheme that solves the above-mentioned technical problem is:

A continuous casting tundish cover with argon blowing function, the cover is a rectangular steel structure frame, the steel structure frame is welded with horizontal and vertical support ribs, and the upward and downward anchor hooks are welded on the support ribs , the refractory material is filled in the steel structure frame of the cover, and the refractory material is closely connected with the support rib plate and the anchor hook. There are three pre-installed holes for baking the tundish and inserting the stopper rod and ladle long nozzle between the steel structure frames of the cover. The improvement of the round hole is that there are two argon main pipes arranged between the supporting ribs, and the two argon main pipes are respectively buried in the refractory material, and the inlet ends of the two argon main pipes are respectively connected to the One end of the quick connector installed on the bag cover is connected, and the other end of the quick connector is connected with the argon gas pipeline on the tundish car. One main argon gas pipeline is the main argon gas exhaust pipeline, and how many argon gas exhaust main pipelines are connected? The outlets of multiple exhaust branches face the bottom of the tundish, and the other main argon gas line is the main argon protection line. The main line of argon protection is connected to multiple protection branches. The air outlets of the road are respectively opposite to the circumference of the reserved circular hole of the bag cover.

For the above-mentioned continuous casting tundish cover with argon blowing function, the argon gas exhaust main pipeline is connected with four exhaust branches, the ends of the four exhaust branches are arranged along the center line in the length direction of the cover, and the four exhaust branches The air outlet of the air outlet is vertically downward toward the bottom surface of the tundish, and the air outlets of the four exhaust branches are 50-150mm away from the bottom surface of the bag cover.

For the above-mentioned continuous casting tundish cover with argon blowing function, the argon protection main line is connected to six protection branches, the six protection branches are parallel to each other, and the six protection branches are respectively arranged in pairs of three cover reserved circles. On both sides of the hole, 4-6 conical argon blowing nozzles are installed on each protection branch, and the nozzle angle of the argon blowing nozzle is 60°-80°.

The beneficial effects of the utility model are:

In the utility model, two argon main pipes are installed and pre-buried in the package cover. The inlet ends of the two argon main pipes are respectively connected with the argon pipes on the tundish car through quick joints. The two argon main pipes have respectively The exhaust branch and the protection branch extend into the tundish below the bag cover. Before the ladle is poured, the argon main pipeline fills the argon into the tundish through the exhaust branch to discharge the air. The air outside the tundish realizes the real whole-process protective pouring, improves the purity of the tundish molten steel, and improves the pass rate of the final product.

Description of drawings

Fig. 1 is the structure looking up schematic diagram of the present utility model;

Fig. 2 is a cross-sectional view along line A-A of Fig. 1 .

The markings in the figure are as follows: steel structure frame 1, quick connector 2, argon exhaust main line 3, argon protection main line 4, argon blowing nozzle 5, support rib 6, anchor hook 7, refractory material 8, reserved circle Hole 9.

detailed description

The utility model is composed of a steel structure frame 1, a supporting rib plate 6, an anchor hook 7, a refractory material 8, a quick joint 2, an argon exhaust main line 3, an argon protection main line 4, and an argon blowing nozzle 5.

As shown in the figure, the steel structure frame 1 is welded into a rectangular frame by thick steel plates or channel steels. The welded steel plates are arranged horizontally and vertically in the middle of the steel structure frame 1 as the support ribs 6, and upward and downward anchors are welded on the support ribs 6. The hook 7 and the refractory material 8 are filled in the covered steel structure frame 1, the refractory material 8 is closely connected with the support rib 6 and the anchor hook 7, and the anchor hook 7 is used to grasp the refractory material 8, so that the refractory material and the steel structure frame 1 together to form an integral enclosure. There are three reserved circular holes 9 between the steel structure frames of the cover, which are used for baking the tundish and inserting stopper rods and ladle shrouds.

The figure shows that there are two argon main pipes arranged between the support ribs 6, and the two main argon pipes are buried in the refractory material 8 respectively, and are pre-buried in the refractory material to be protected by it, so as to avoid being melted by high-temperature molten steel. damage. The inlet ends of the two main argon pipelines are respectively connected to one end of the quick joint 2 installed on the cover, and the other end of the quick joint 2 is connected to the argon pipeline on the medium-sized car.

As shown in the figure, one main argon gas pipeline is the main argon gas exhaust pipeline 3, and the main argon gas exhaust pipeline 3 is connected to four exhaust branch circuits, and the ends of the four exhaust branch circuits are arranged along the center line in the length direction of the cover. The air outlets of the four exhaust branches are vertically downward toward the bottom surface of the tundish, and the air outlets of the four exhaust branches are 50-150mm away from the bottom surface of the cover. The main argon exhaust pipeline 3 is connected with four exhaust branches to realize blowing argon into the tundish to the bottom of the tundish, and the main argon exhaust pipeline 3 is opened before continuous casting to discharge the air in the tundish.

The figure shows that the other argon main line is the argon protection main line 4, and the argon protection main line 4 is connected to six protection branches, the six protection branches are parallel, and the six protection branches are respectively arranged in pairs in three packages. On both sides of the round hole 9 reserved in the cover, 4-6 conical argon blowing nozzles 5 are installed on each protection branch, and the nozzle angle of the argon blowing nozzle 5 is 60°-80°. While injecting molten steel into the tundish, open the argon protection main pipe 4, and open it all the way during the pouring process, so that an argon gas curtain is formed at the reserved round hole 9 of the tundish to isolate the air outside the tundish, realizing The complete isolation of molten steel and air in the tundish further improves the protective pouring effect and prevents the molten steel from being oxidized again. At the same time, when the purity of the molten steel is high, less or no tundish covering agent can be used.

The use process of the present utility model is as follows:

(1) After the tundish is repaired and built, cover the tundish cover, and spread refractory fiber felt between the tundish cover and the gap between the contact surface of the tundish to seal it tightly. After installing the stopper rod and the control mechanism, the cover is hoisted by the crown crane to the tundish car, and the operator connects the quick connectors of the argon gas inlet pipes on both sides of the cover with the argon gas pipeline on the tundish car to prepare for pouring.

(2) Before the continuous casting starts, the operator first opens the argon gas in the main argon exhaust pipeline 3 to discharge the air in the tundish, and after injecting molten steel into the tundish, the argon exhaust main pipeline 3 argon closure.

(3) While injecting molten steel into the tundish, the operator opens the argon gas in the argon protection main line 4, and opens it all the way during the pouring process, so that an argon gas curtain is formed at the reserved round hole 9 of the tundish cover , isolate the air outside the tundish, and realize the complete isolation of molten steel and air in the tundish.

In the utility model, the operator only needs to open the argon valve when the ladle is away from the high temperature before pouring. That is to say, the working environment of the operators is improved, the danger is reduced, and the effect of filling the argon gas into the tundish to discharge the air before starting the pouring is ensured, so as to realize the real full-process protective pouring and improve the qualification rate of the product.

Claims (3)

1. A continuous casting tundish cover with argon blowing function. The cover is a rectangular steel structure frame (1), and the steel structure frame (1) is welded with horizontal and vertical support ribs (6). The upward and downward anchor hooks (7) are welded on the rib plate (6), and the refractory material (8) is filled in the covered steel structure frame (1), and the refractory material (8) is connected with the supporting rib plate (6) and the anchor The hooks (7) are tightly connected, and there are three reserved round holes (9) for baking the tundish and inserting stopper rods and ladle shrouds between the steel frame (1) of the cover, which is characterized in that: (6) There are two argon main pipes arranged in between. The two argon main pipes are respectively buried in the refractory material (8). (2) are connected at one end, and the other end of the quick connector (2) is connected with the argon pipeline on the tundish car. One argon main pipeline is the argon exhaust main pipeline (3), and the argon exhaust main pipeline (3 ) road is connected with multiple exhaust branches, the outlets of the multiple exhaust branches face the bottom of the tundish, the other argon main line is the argon protection main line (4), and the argon protection main line (4 ) are connected with a plurality of protection branches, and the air outlets of the protection branches are respectively opposite to the circumference of the reserved round hole (9) of the cover. 2. The continuous casting tundish cover with argon blowing function according to claim 1, characterized in that: the argon exhaust main pipeline (3) is connected to four exhaust branches, and the ends of the four exhaust branches are Arranged along the center line in the length direction of the cover, the air outlets of the four exhaust branches are vertically downward toward the bottom of the tundish, and the air outlets of the four exhaust branches are 50-150mm away from the bottom of the cover. 3. The continuous casting tundish cover with argon blowing function according to claim 2, characterized in that: the argon protection main pipeline (4) is connected to six protection branches, the six protection branches are parallel to each other, and the six protection branches The branches are respectively arranged in pairs on both sides of the three reserved round holes (9) in the cover, and 4-6 conical argon blowing nozzles (5) are installed on each protection branch, and the nozzles of the argon blowing nozzles (5) The angle is 60°-80°.