Method for preventing adhesion of steel ingot and steel ingot mold

Abstract

The invention discloses a method for preventing adhesion of a steel ingot and a steel ingot mold, before the steel ingot mold is used, the inner wall of the steel ingot mold is coated with a layer of fireproof coating, drying is performed, the coating is tightly adsorbed with the steel ingot mold, during casting, scouring of molten steel is effectively blocked, pits cannot be formed in the inner wall of the steel ingot mold, the steel ingot and the steel ingot mold cannot be adhered together, steel ingot demolding is facilitated, and the service life of the steel ingot mold is prolonged. The service life of the ingot mold is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of metal smelting, and in particular relates to a method for preventing a steel ingot from sticking to a steel ingot mold. Background Art

[0002] The quality of the inner wall of the steel ingot mold is one of the key factors to ensure the quality of steel ingot production. The inner surface must be flat and smooth, and no defects such as sand sticking, cracks, pits, pores, bulges, cold joints, slag inclusions and heavy skin are allowed. Only when the inner wall surface of the steel ingot mold is smooth can high-quality steel ingot products be produced.

[0003] At present, when molten steel enters the ingot mold in the laboratory, a large horizontal vortex will be formed along the inner surface. The flow rate of the molten steel when entering the ingot mold will increase, and the impact force will increase, causing a large scouring of the inner surface of the ingot mold. During the cooling process of the ingot, the ingot and the ingot mold will stick together, which will bring great difficulties to the subsequent demolding, and cause varying degrees of damage to the inner wall of the ingot mold, which may lead to the scrapping of the ingot mold. Summary of the invention

[0004] In order to overcome the shortcomings of the existing experimental steel ingot and the steel ingot mold being adhered together, which makes subsequent demoulding difficult and easily causes different degrees of damage to the inner wall of the steel ingot mold and may even cause the steel ingot mold to be scrapped, the purpose of the present invention is to provide a method for preventing the steel ingot and the steel ingot mold from adhering.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] The present invention provides a method for preventing a steel ingot from sticking to a steel ingot mold, comprising the following steps:

[0007] ①Screen and filter the alumina refractory coating with a standard sieve to remove large particles of impurities, add appropriate amount of water glass and water, mix and stir evenly (the mass ratio of alumina refractory coating to water glass and water is 75%:10%:15%), and evenly apply it on the inner wall of the ingot mold, brushing 1-4 times horizontally and vertically;

[0008] ②After painting, place the ingot mold in a dry place and dry it naturally for more than 24 hours, or use an oven to dry it at 200±20℃ for 2.5-3.5 hours;

[0009] ③ When pouring molten steel, place riser bricks and pouring bricks on the dried ingot mold, align the pouring center with the water inlet of the vacuum induction furnace crucible, and slowly pour the molten steel into the ingot mold;

[0010] ④ After casting, demould the ingot after it is completely solidified.

[0011] Furthermore, the product was dried in an oven at 200° C. for 3 hours.

[0012] Furthermore, brush it twice in both horizontal and vertical directions.

[0013] Furthermore, brush it 3 times horizontally and vertically.

[0014] Furthermore, after the molten steel is coated with the coating, the degree of damage to the inner wall of the ingot mold is greatly reduced.

[0015] Furthermore, after applying three coats of paint, the paint is tightly adsorbed to the inner wall of the ingot mold and will not fall off, which can effectively protect the inner wall of the ingot mold from being eroded by molten steel, and the steel ingot will not stick to the ingot mold.

[0016] Furthermore, the steel ingot will not be adhered to the steel ingot mold, thus preventing the inner wall of the steel ingot mold from being damaged during demoulding, thereby increasing the service life of the steel ingot mold.

[0017] Compared with the prior art, the beneficial technical effects of the present invention are:

[0018] The present invention applies a layer of refractory coating on the inner wall of the steel ingot mold. After drying, the coating is tightly adsorbed to the steel ingot mold, effectively blocking the scouring of molten steel, protecting the inner wall of the steel ingot mold from pits, preventing the steel ingot from sticking to the steel ingot mold, and preventing the inner wall of the steel ingot mold from being damaged during demoulding, which may cause the steel ingot mold to be scrapped in serious cases, thereby increasing the service life of the steel ingot mold. DETAILED DESCRIPTION

[0019] A method for preventing a steel ingot from sticking to a steel ingot mold comprises the following steps:

[0020] ①Screen and filter the alumina refractory coating with a standard sieve to remove large particles of impurities, add appropriate amount of water glass and water, mix and stir evenly (the mass ratio of alumina refractory coating to water glass and water is 75%:10%:15%), and evenly apply it on the inner wall of the ingot mold, brush it 1 time, 2 times or 3 times horizontally and vertically to select the appropriate number of brushing times.

[0021] ②After painting, place the ingot mold in a dry place and dry it naturally for more than 24 hours, or use an oven to dry it at 200℃ for 3 hours.

[0022] ③ When pouring molten steel, place riser bricks and pouring bricks on the dried ingot mold, align the pouring center with the water inlet of the vacuum induction furnace crucible, and slowly pour the molten steel into the ingot mold.

[0023] ④ After the casting is completed, the ingot is demoulded after it is completely solidified. Inspection found that after the molten steel was coated with paint, the degree of damage to the inner wall of the ingot mold was greatly reduced. Through multiple casting comparison tests, it was found that after three coats of paint were applied, the paint was tightly adsorbed to the inner wall of the ingot mold and would not fall off, which could effectively protect the inner wall of the ingot mold from being washed by molten steel, and the ingot would not stick to the ingot mold.

[0024] Application effect of the present invention:

[0025] Through the implementation of the above method, after three coats of coating, the coating is closely adsorbed to the ingot mold, effectively blocking the erosion of molten steel, protecting the inner wall of the ingot mold from pits, and preventing the ingot from sticking to the ingot mold, preventing the inner wall of the ingot mold from being damaged during demoulding, thereby increasing the service life of the ingot mold. The coated ingot mold can be used continuously for more than 10 furnaces, greatly saving time. In addition, the scrapping of ingot molds is reduced to 2-3 per year.

[0026] Before the implementation of the method of the present invention, the steel ingot mold in the laboratory is directly used for casting. If the steel ingot mold loses flesh during the demoulding process, the lost flesh must be leveled and repaired with refractory clay before the steel ingot mold can be used again. This adds 10 minutes to the process time for each furnace of steel, which is relatively cumbersome. If the flesh loss is serious and cannot be repaired, the steel ingot mold will be scrapped. The laboratory will scrap 10-15 steel ingot molds every year, which increases a portion of the experimental cost.

[0027] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A method for preventing a steel ingot from sticking to an ingot mold, characterized in that: The steps include: ①Screen and filter the alumina refractory coating with a standard sieve to remove large particles of impurities, add appropriate amount of water glass and water, mix and stir evenly, and evenly apply it on the inner wall of the ingot mold, brushing 1-4 times horizontally and vertically; ②After painting, place the ingot mold in a dry place and dry it naturally for more than 24 hours, or use an oven to dry it at 200±20℃ for 2.5-3.5 hours; ③ When pouring molten steel, place riser bricks and pouring bricks on the dried ingot mold, align the pouring center with the water inlet of the vacuum induction furnace crucible, and slowly pour the molten steel into the ingot mold; ④ After casting, demould the ingot after it is completely solidified.

2. The method for preventing the steel ingot from sticking to the steel ingot mold according to claim 1, characterized in that: Dry in oven at 200°C for 3 hours.

3. The method for preventing the steel ingot from sticking to the steel ingot mold according to claim 1, characterized in that: Brush twice horizontally and vertically.

4. The method for preventing the steel ingot from sticking to the steel ingot mold according to claim 1, characterized in that: Brush 3 times horizontally and vertically.

5. The method for preventing the steel ingot from sticking to the steel ingot mold according to claim 1, characterized in that: After the molten steel is coated with paint, the damage to the inner wall of the ingot mold is greatly reduced.

6. The method for preventing the steel ingot from sticking to the steel ingot mold according to claim 4, characterized in that: After applying the paint three times, the paint is tightly adsorbed to the inner wall of the ingot mold and will not fall off, which can effectively protect the inner wall of the ingot mold from being eroded by molten steel, and the steel ingot will not stick to the ingot mold.

7. The method for preventing the steel ingot from sticking to the steel ingot mold according to claim 1, characterized in that: This prevents the steel ingot from sticking to the ingot mould and prevents damage to the inner wall of the ingot mould during demoulding, thereby increasing the service life of the ingot mould.

8. The method for preventing the steel ingot from sticking to the steel ingot mold according to claim 1, characterized in that: The mass ratio of alumina refractory coating, water glass and water is 75%:10%:15%.