CN103409641A - Plugging method for bottom water tank and crystallizer during stripping electroslag re-melting - Google Patents

Abstract

The invention discloses a plugging method for a mid-bottom water tank and a crystallizer in electroslag remelting of ingot drawing, which effectively solves the problem of leakage of liquid slag or molten steel. The steps of the invention include: according to the gap between the crystallizer and the side of the bottom water tank, digging 2-6 layers of grooves with a depth of 3-8 mm and a width of 3-8 mm on the side of the bottom water tank; winding asbestos ropes, the radius of the asbestos ropes and the depth of the grooves Equal, the length is equal to the circumference of the groove; insert the asbestos rope into the groove on the side of the bottom water tank, and gently beat it tightly with a wooden board; raise the bottom water tank to the set position in the crystallizer, and the plugging is completed. The invention is simple and convenient to operate, can save plugging time and improve production efficiency.

Description

A plugging method for bottom water tank and crystallizer in electroslag remelting ingot drawing

technical field

The invention belongs to the technical field of metal remelting, in particular to a plugging method for a mid-bottom water tank and a crystallizer of ingot-pulling electroslag remelting.

Background technique

Compared with the fixed electroslag remelting process, the ingot electroslag remelting has two main advantages. First, because of the use of T-type crystallizer technology, it breaks the requirement that the filling ratio in the fixed electroslag remelting production must be less than 1? According to the law, the length of the steel ingot produced is increased to 6m or 9m, eliminating the preliminary rolling and blanking process and directly entering the finishing rolling process, reducing production costs; second, the production efficiency is increased by 20% to 30%, and the yield is increased by 5% to 10%. .

During the fixed electroslag remelting process, fillers such as asbestos or steel plates are placed between the crystallizer and the bottom water tank, and then the crystallizer and the bottom water tank are fastened with bolts. In the electroslag remelting process of ingot drawing using a T-shaped crystallizer, it is required that the bottom water tank must be raised to within 150mm from the bottom of the large section to be able to produce normally. The existing plugging method is no longer suitable.

Check the published patent documents and find two documents related to the present invention:

1. Chinese Patent Publication (Announcement) No.: CN101653818 discloses a method for blocking dummy ingots in continuous casting. The steps are: 1. Check the head of the dummy ingot. The width of the dummy head is smaller than the lower opening of the crystallizer; 2. Fill Wedge-shaped asbestos board, first dry the surface of crystallization and dummy head; 3. Place steel bars and nail chips a. The method is simple in operation, shortens the time for blocking the dummy spindle, and has good safety.

2. Chinese Patent Publication (Announcement) No.: CN101745621A, which discloses a method for sealing dummy head of slab continuous casting machine. Place two thin iron plates at the corners of the hook head in the gap of the hook, cover the paper rope with nail shavings, place the spring at the bottom of the groove, and then place the spring upwards; place the rest of the groove horizontally, misaligned with each other. The filling state of molten steel in the dummy head plugged by this method is good, the plug is reliably connected to the dummy head, and there is no accident of decoupling or billet clamping at the start, eliminating the phenomenon of steel breakout at the start, avoiding the return of heavy tanks for refining, and ensuring the safety of the site. The normal production rhythm improves the safety factor of personnel and equipment.

In the continuous casting process, asbestos or paper pulp is used to block the gap between the crystallizer and the dummy, and iron filings are sprinkled above the gap to absorb the heat of molten steel, which is beneficial to solidification and protects the plugging filler. Documents 1 and 2 are feasible. , because in continuous casting, the time from the injection of molten steel into the crystallizer to the start of casting generally does not exceed 5 minutes. The ingot electroslag extraction process is different from the continuous casting process. It generally takes 30 to 80 minutes from the slag melting to the start of ingot extraction. According to the plugging method of literature 1 and 2, the filling material will be melted in the early stage of slag melting, resulting in slag leakage. ACCIDENT. Therefore, the above method is not suitable for the plugging between the crystallizer and the dummy ingot in the electroslag remelting process of ingot drawing.

Contents of the invention

The invention provides a plugging method for a bottom water tank and a crystallizer in electroslag remelting ingot drawing, which effectively solves the problem of leakage of liquid slag or molten steel.

The present invention provides a plugging method for the mid-bottom water tank and crystallizer of ingot drawing electroslag remelting, comprising the following steps:

a. According to the gap between the crystallizer and the side of the bottom water tank, dig 2-6 layers of grooves with a depth of 3-8mm and a width of 3-8mm on the side of the bottom water tank;

b. Winding asbestos rope, the radius of the asbestos rope is equal to the depth of the groove, and the length is equal to the circumference of the groove;

c. Insert the asbestos rope into the groove on the side of the bottom water tank, and gently tap it tightly with a wooden board;

d. Raise the bottom water tank to the set position in the crystallizer, and the plugging is completed.

Compared with existing similar technologies, the present invention has remarkable beneficial effects embodied in:

The invention utilizes the cooling effect of the crystallizer copper plate to protect the asbestos from being melted. In the initial stage of slag melting, slag liquid will flow into the gap between the crystallizer and the dummy ingot. Due to the strong water cooling effect of the mold and dummy ingot, the slag liquid will solidify soon, and the solidified slag shell in the gap will also become For the plugged filler, even if the molten steel breaks through the first layer of asbestos rope, since the crystallizer and the bottom water tank have great cooling strength, and the gap between them is generally 2 to 5mm, the temperature of the molten steel will drop sharply, and there will be no Will break through the second layer of asbestos rope. This is to achieve the purpose of blocking. The invention is simple and convenient to operate, can save plugging time and improve production efficiency.

Description of drawings

Fig. 1 is a schematic diagram of the plugging preparation stage structure of a method for plugging the bottom water tank and crystallizer of electroslag remelting ingot drawing.

Fig. 2 is a schematic diagram of the plugging structure of a plugging method for the bottom water tank and the crystallizer of electroslag remelting ingot drawing.

In the figure: 1. Bottom water tank, 2. Asbestos rope, 3. Crystallizer, 4. Slag, 5. Electrode.

Detailed ways

Below in conjunction with accompanying drawing, describe the present invention with embodiment.

Example 1

As shown in Figure 1 and Figure 2, a plugging structure for the bottom water tank and crystallizer of electroslag remelting ingot drawing includes: T-shaped crystallizer 3 The size of the upper opening is 800×800×200mm, and the lower opening is 600×600×300mm The amount of slag 4 is 400kg; the electrode 5 is 600×600×3000mm; the bottom water tank 1 is 594×594×150mm, the groove depth is 3mm, the groove width is 3mm, 3 layers; the asbestos rope 2 is Φ6×2400mm, 3 root.

A method for plugging the mid-bottom water tank and crystallizer of electroslag remelting ingot drawing is carried out according to the following steps:

1. Insert the asbestos rope 2 into the groove of the bottom water tank 1, and gently pat it tightly with a wooden board;

2. Raise the bottom water tank inlaid with asbestos rope to a position 300mm away from the upper mouth of the crystallizer, and the plugging is completed.

Example 2

As shown in Figure 1 and Figure 2, a plugging structure of the bottom water tank and crystallizer in the electroslag remelting of ingot drawing includes: the crystallizer 3 is Φ1000×700mm; the slag 4 is 600kg; the electrode 5 is Φ700× 3000mm; bottom water tank 1 is Φ992×180mm, groove depth 4mm, groove width 8mm, 4 layers; asbestos rope 2 is Φ8×3140mm, 4 pieces.

A method for plugging the mid-bottom water tank and crystallizer of electroslag remelting ingot drawing, and the specific plugging process is carried out according to the following steps:

1. Insert the asbestos rope 2 into the groove of the bottom water tank 1, and gently pat it tightly with a wooden board;

2. Raise the bottom water tank inlaid with asbestos rope to a position 550mm away from the upper mouth of the crystallizer, and the plugging is completed.

Example 3

As shown in Figure 1 and Figure 2, a plugging structure for the bottom water tank and crystallizer of electroslag remelting ingot pumping includes: a hollow ingot crystallizer 3 is produced, the outer crystallizer is Φ1200×800mm, and the inner mold is Φ400× 650mm; the amount of slag 4 is 700kg; the electrode 5 is Φ300×3000mm×10; the outer circle of the bottom water tank 1 is Φ1192/inner hole Φ792×120mm, the depth of the inner and outer grooves is 4mm, and the width of the groove is 8mm, 5 layer; asbestos rope 2 is Φ8×3760mm, 4 pieces, Φ8×2510mm, 4 pieces.

A method for plugging the mid-bottom water tank and crystallizer of electroslag remelting ingot drawing, and the specific plugging process is carried out according to the following steps:

1. Insert the asbestos rope 2 into the inner and outer grooves of the bottom water tank 1 respectively, and lightly pat it tightly with a wooden board;

2. Raise the bottom water tank inlaid with asbestos rope to a position 500mm away from the upper mouth of the crystallizer, and the plugging is completed.

Claims (1)

1. the method for blocking of end water tank and crystallizer in a stripping esr is characterized in that the method comprises the following steps:

A. according to the gap between crystallizer and water tank side, the end, in water tank side, the end, dig the groove of the 2-6 layer 3-8mm degree of depth and 3-8mm width;

B. be wound around asbestos twine, the asbestos twine radius equates with depth of groove, and length equates with the groove girth;

C. asbestos twine is mounted in the groove of water tank side, the end, with plank chucked consolidation;

D. end water tank is increased to desired location in crystallizer, shutoff finishes.

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