Deoxidation alloying method for molten steel

Abstract

The invention relates to a deoxidation alloying method for molten steel. The method comprises the steps that deoxidation alloy balls are obtained; coating at least part of the surface of the deoxidized alloy ball with a first material to obtain a carbon structure alloy ball; wherein the first material comprises barium carbonate powder; hydrogen storage alloy balls are obtained; and in the converter tapping process, the carbon structure alloy balls and the hydrogen storage alloy balls are added into molten steel, so that the molten steel is subjected to deoxidation alloying treatment, and target molten steel is obtained. The target molten steel is refined to obtain target standard carbon silicon manganese steel molten steel, and the requirements that the average oxygen content is not higher than 15 ppm, and the number of inclusions is not higher than 8 / mm < 2 > are met; the chemical components meet the requirements that the carbon content is 0.3%-0.45%, the silicon content is 0.65%-1%, and the manganese content is 1.35%-1.7%.

Description

Technical Field

[0001] The present application relates to the technical field of steel smelting, and in particular to a method for deoxidation and alloying of molten steel. Background Art

[0002] The reaction of reducing the oxygen content in steel during steelmaking and casting is an important process to ensure the quality of ingots (billets) and steel products. In the smelting process of high-carbon silicon-manganese steel, the converter process is the key link to control the composition and temperature of molten steel. First of all, it is necessary to ensure that the raw material ratio of the converter is accurate to meet the requirements of the chemical composition of the steel grade. Secondly, through a reasonable oxygen supply system and slag making system, the redox reaction in the smelting process is controlled to avoid excessive oxygen content in the molten steel.

[0003] However, during deoxidation in converter smelting, some CaO-SiO2 or CaO-MnO-SiO2 inclusions are often not removed from the molten steel due to insufficient reaction, resulting in low cleanliness of the molten steel. Summary of the invention

[0004] The present application provides a deoxidation and alloying method for molten steel to solve the following technical problem: how to improve the cleanliness of molten carbon-silicon-manganese steel.

[0005] In a first aspect, the present application provides a method for deoxidation and alloying of molten steel, the method comprising:

[0006] Obtaining deoxidized alloy balls;

[0007] Applying a first material to at least a portion of the surface of the deoxidized alloy ball to obtain a carbon structure alloy ball; wherein the first material includes barium carbonate powder;

[0008] A hydrogen storage alloy ball is obtained;

[0009] During the steel tapping process of the converter, the carbon structure alloy balls and the hydrogen storage alloy balls are added to the molten steel to perform deoxidation and alloying treatment on the molten steel to obtain the target molten steel.

[0010] Optionally, the step of obtaining the deoxidized alloy ball comprises:

[0011] The second material is melted and then formed to obtain a deoxidized alloy ball; wherein the second material includes: manganese, aluminum, silicon and iron, in parts by weight,

[0012] The content of manganese is 10 to 30 parts, the content of aluminum is 5 to 15 parts, the content of silicon is 10 to 30 parts, and the content of iron is 5 to 15 parts.

[0013] Optionally, in the first material, the content of the barium carbonate powder is 5 to 15 parts by weight.

[0014] Optionally, the first material also includes: calcium oxide, aluminum oxide and carbon powder; wherein, in parts by weight, the content of calcium oxide is 5 to 15 parts, the content of aluminum oxide is 2 to 10 parts, and the content of carbon powder is 10 to 30 parts.

[0015] Optionally, the weight ratio of the first material to the deoxidized alloy ball is 20:80.

[0016] Optionally, a hydrogen storage alloy ball is obtained, comprising:

[0017] The third material is melted and then formed to obtain an alloy ball to be used for hydrogen storage; wherein the third material comprises titanium and iron; in parts by weight, the content of titanium is 10 to 30 parts, and the content of iron is 5 to 15 parts.

[0018] Optionally, the timing of adding is 1 / 8 to 1 / 6 of the time when the converter is tapping steel.

[0019] Optionally, the particle size of the deoxidized alloy balls is 10 mm to 40 mm.

[0020] Optionally, the particle size of the barium carbonate powder is 0.1 mm to 1 mm.

[0021] Optionally, the particle size of the hydrogen storage alloy ball is 45 μm to 55 μm.

[0022] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0023] The deoxidation and alloying method of molten steel provided in an embodiment of the present application is applied to converter smelting, and the method includes: obtaining deoxidation alloy balls; coating a first material on at least a portion of the surface of the deoxidation alloy balls to obtain carbon structure alloy balls; wherein the first material includes barium carbonate powder; obtaining hydrogen storage alloy balls; adding the carbon structure alloy balls and the hydrogen storage alloy balls to molten steel to perform deoxidation and alloying treatment on the molten steel to obtain target molten steel. The first material containing barium carbonate powder is coated on at least part of the surface of the deoxidized alloy ball, so as to form a coating layer on the outside of the deoxidized alloy ball, which can adjust the reaction time of the deoxidized alloy ball in the molten steel; the carbon structure alloy ball enters the molten steel, and the coating layer first reacts with the molten steel. After the coating layer fully reacts with the molten steel or melts into the molten steel, the inner layer of the deoxidized alloy ball begins to melt into the molten steel, and the deoxidized alloy ball is used to further deoxidize the molten steel; when the barium carbonate powder is decomposed in the molten steel, carbon dioxide bubbles are generated, which helps to carry the inclusions generated by deoxidation in the converter smelting to float; when the hydrogen storage alloy ball containing hydrogen is decomposed in the molten steel, hydrogen bubbles are generated, which helps to carry the inclusions generated in the converter smelting to float; thus, through the synergistic effect of the barium carbonate powder and the hydrogen storage alloy ball, the CaO-SiO2 or CaO-MnO-SiO2 inclusions in the molten steel can be effectively removed, thereby improving the cleanliness of the molten steel. In summary, the cleanliness of the carbon silicon manganese steel molten steel is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0026] Figure 1 A schematic flow chart of a method for deoxidation and alloying of molten steel provided in an embodiment of the present application. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0028] Various embodiments of the present application may be presented in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity, and should not be understood as a rigid limitation on the scope of the present application; therefore, the range description should be considered to have specifically disclosed all possible sub-ranges and single numerical values ​​within the range. For example, the range description from 1 to 6 should be considered to have specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5 and 6, which apply regardless of the range. In addition, whenever a numerical range is indicated herein, it is meant to include any cited number (fractional or integer) within the indicated range.

[0029] In the present application, in the absence of any contrary description, the directional words used, such as "upper" and "lower", are specifically the directions of the drawings in the accompanying drawings. In addition, in the description of the present specification, the terms "including", "comprising", etc. refer to "including but not limited to". In this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. In this article, "and / or" describes the association relationship of the associated objects, indicating that there may be three relationships, for example, A and / or B, which can represent: A exists alone, A and B exist at the same time, and B exists alone. Wherein A, B can be singular or plural. In this article, "at least one" refers to one or more, and "plural" refers to two or more. "At least one", "at least one of the following" or similar expressions refer to any combination of these items, including any combination of singular or plural items. For example, "at least one of a, b, or c", or "at least one of a, b and c", can both mean: a, b, c, ab (i.e. a and b), ac, bc or abc, where a, b, c can be single or plural, respectively.

[0030] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in this application can be purchased from the market or prepared by existing methods.

[0031] In a first aspect, the present application provides a method for deoxidation and alloying of molten steel. Figure 1 A schematic diagram of a deoxidation and alloying method of molten steel provided in an embodiment of the present application; see Figure 1 , the method comprising:

[0032] S1, obtain deoxidized alloy ball;

[0033] In some embodiments, the step of obtaining a deoxidized alloy ball comprises:

[0034] The second material is melted and then formed to obtain a deoxidized alloy ball; wherein the second material includes: manganese, aluminum, silicon and iron, in parts by weight,

[0035] The content of manganese is 10 to 30 parts, the content of aluminum is 5 to 15 parts, the content of silicon is 10 to 30 parts, and the content of iron is 5 to 15 parts.

[0036] In the embodiment of the present application, after the deoxidation alloy ball is put into the molten steel, the molten steel is deoxidized by manganese, aluminum, silicon and iron in the deoxidation alloy ball, and manganese can reduce the activity of SiO2 in the deoxidation product phase and increase the activity of silicon in the molten steel, thereby enhancing the deoxidation ability of silicon and improving the deoxidation effect of the deoxidizer to a certain extent. Therefore, the use of the second material containing manganese, aluminum, silicon and iron can improve the deoxidation efficiency and increase the activity of silicon in the molten steel. Exemplarily, the manganese content can be 10 parts, 12 parts, 14 parts, 16 parts, 18 parts, 20 parts, 22 parts, 24 parts, 26 parts, 28 parts, 30 parts, etc., the aluminum content can be 5 parts, 7 parts, 9 parts, 11 parts, 13 parts, 15 parts, etc., the silicon content can be 10 parts, 12 parts, 14 parts, 16 parts, 18 parts, 20 parts, 22 parts, 24 parts, 26 parts, 28 parts, 30 parts, etc., and the iron content can be 5 parts, 7 parts, 9 parts, 11 parts, 13 parts, 15 parts, etc.

[0037] Specifically, S1 includes: taking 10-30 parts of manganese, 5-15 parts of aluminum, 10-30 parts of silicon and 5-15 parts of iron, and putting them into a submerged arc furnace in sequence to melt and mix manganese, aluminum, silicon and iron. After manganese, aluminum, silicon and iron are melted and mixed, a molten alloy can be obtained. Then, the molten alloy is put into a mold. After the molten alloy is cooled and formed in the mold, a deoxidized alloy ball can be obtained.

[0038] In some embodiments, the particle size of the deoxidized alloy ball is 10 mm to 40 mm.

[0039] In the embodiment of the present application, the particle size of the deoxidized alloy ball can be 10 mm to 40 mm, which can accelerate the reaction speed of the deoxidized alloy ball. For example, the particle size of the deoxidized alloy ball can be 10 mm, 20 mm, 30 mm, 40 mm, etc.

[0040] S2, coating a first material on at least a portion of the surface of the deoxidized alloy ball to obtain a carbon structure alloy ball; wherein the first material comprises barium carbonate powder;

[0041] In some embodiments, in the first material, the content of the barium carbonate powder is 5 to 15 parts by weight.

[0042] In some embodiments, the barium carbonate powder has a particle size of 0.1 mm to 1 mm.

[0043] In the embodiment of the present application, the carbon dioxide bubbles generated by the decomposition of barium carbonate powder in molten steel help to carry inclusions to float and purify the molten steel, and the decomposed barium oxide floats to the slag to help desulfurization, which can be used to produce ultra-low sulfur steel. For example, the content of the above barium carbonate powder can be 5 parts, 7 parts, 9 parts, 11 parts, 13 parts, 15 parts, etc.; the particle size of the barium carbonate powder can be 0.1mm, 0.3mm, 0.5mm, 0.7mm, 0.9mm, 1mm, etc.

[0044] In some embodiments, the first material further includes: calcium oxide, aluminum oxide and carbon powder; wherein, in parts by weight, the content of calcium oxide is 5 to 15 parts, the content of aluminum oxide is 2 to 10 parts, and the content of carbon powder is 10 to 30 parts.

[0045] In the embodiment of the present application, calcium oxide can react with oxygen in the molten steel to generate composite oxides such as calcium oxide-aluminum oxide, thereby reducing the oxygen content in the molten steel. At the same time, these oxides can form inclusions that are easy to float and remove under certain conditions, reducing the adverse effects of dissolved oxygen in the molten steel on the quality of the steel. The role of aluminum oxide: During the deoxidation and alloying process, aluminum oxide can combine with other oxides in the molten steel, such as silicon oxide, manganese oxide, etc., to form composite inclusions. At the same time, the melting point, density and other physical properties of these composite inclusions are different from those of individual oxides, which is conducive to their floating removal during the molten steel treatment process, reducing the residue of inclusions in the steel and improving the purity of the steel. For example, the content of calcium oxide can be 5 parts, 7 parts, 9 parts, 11 parts, 13 parts, 15 parts, etc.; the content of aluminum oxide can be 2 parts, 4 parts, 6 parts, 8 parts, 10 parts, etc.; the content of carbon powder can be 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, etc.

[0046] In some embodiments, a weight ratio of the first material to the deoxidized alloy ball is 20:80.

[0047] In the embodiment of the present application, the carbon dioxide bubbles generated by the decomposition of the barium carbonate powder in the carbon structure alloy ball help to carry the inclusions to float, and at the same time, the calcium oxide and aluminum oxide can react with the inclusions in the molten steel to generate inclusions that are more easily floated, thereby reducing the residual inclusions in the steel and improving the purity of the molten steel. Using the above-mentioned barium carbonate powder, calcium oxide, aluminum oxide and carbon powder, the carbon structure alloy ball can release a large amount of carbon dioxide bubbles after being put into the molten steel, and the released calcium oxide and aluminum oxide can fully react with the inclusions in the molten steel. Therefore, the first material containing barium carbonate powder is coated on at least part of the surface of the deoxidized alloy ball, thereby forming a coating layer on the outside of the deoxidized alloy ball, which can adjust the reaction time of the deoxidized alloy ball in the molten steel; the molten steel is fully deoxidized by the carbon in the coating layer, and at the same time, the aluminum oxide, calcium oxide and barium carbonate fine powder in the coating layer enter the molten steel, and after the outer layer carbon fully reacts with the oxygen in the molten steel or melts into the molten steel, the inner layer of the deoxidized alloy ball begins to melt into the molten steel, and the molten steel is further deoxidized by the manganese, aluminum, silicon and iron in the deoxidized alloy ball. Exemplarily, the weight ratio of the first material to the deoxidized alloy ball can be 20:80.

[0048] Specifically, S2 specifically includes: taking 5-15 parts of barium carbonate powder, 5-15 parts of calcium oxide, 2-10 parts of aluminum oxide, 10-30 parts of carbon powder and 1-5 parts of adhesive and putting them into a mixer, and mixing the barium carbonate powder, calcium oxide, aluminum oxide, carbon powder and adhesive by the mixer, after the mixing is completed, putting the mixture into a spraying device, and coating the mixture on the deoxidized alloy ball by the spraying device, and then, after the mixture is dried and hardened, the carbon structure alloy ball can be obtained. The speed of the mixer is 1000-2000 revolutions per minute.

[0049] S3, obtaining a hydrogen storage alloy ball;

[0050] In some embodiments, obtaining a hydrogen storage alloy sphere comprises:

[0051] The third material is melted and then formed to obtain an alloy ball to be used for hydrogen storage; wherein the third material comprises titanium and iron; in parts by weight, the content of titanium is 10 to 30 parts, and the content of iron is 5 to 15 parts.

[0052] In the embodiment of the present application, titanium in the hydrogen storage alloy ball is a metal with good hydrogen storage performance, and titanium and hydrogen can form metal hydrides, for example, titanium and hydrogen react to form titanium hydride (TiH2). The advantages of titanium hydrogen storage include higher hydrogen storage capacity, relatively good hydrogen absorption and desorption kinetics, and better reversibility under certain conditions. Iron can also be used for hydrogen storage, but its hydrogen storage performance is relatively weak. The hydride formed by the reaction of iron and hydrogen is not stable enough at room temperature and pressure, and the conditions for hydrogen absorption and desorption are relatively harsh. However, in practical applications, there are some limitations to simply using titanium or iron to store hydrogen. In order to obtain a more ideal hydrogen storage effect, iron and titanium are usually mixed to improve the performance of hydrogen storage. When the hydrogen storage alloy ball is put into the molten steel, the hydrogen storage alloy ball will release a large amount of hydrogen after being heated, and then float up with inclusions carried by hydrogen bubbles. For example, the titanium content may be 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, etc., and the iron content may be 5 parts, 7 parts, 9 parts, 11 parts, 13 parts, 15 parts, etc.

[0053] In some embodiments, the hydrogen storage alloy spheres have a particle size of 45 μm to 55 μm.

[0054] In the embodiment of the present application, the particle size of the hydrogen storage alloy ball can be 45 μm to 55 μm, so that the hydrogen storage alloy ball can react quickly after being put into the molten steel. For example, the particle size of the hydrogen storage alloy ball can be 45 μm, 47 μm, 49 μm, 51 μm, 53 μm, 55 μm, etc.

[0055] Specifically, S3 includes: taking 10-30 parts of titanium and 5-15 parts of iron, and putting them into a submerged arc furnace in sequence to melt and mix the titanium and iron. After the titanium and iron are melted and mixed, a molten alloy can be obtained. Then, the molten alloy is put into a mold. After the molten alloy is cooled and formed in the mold, a hydrogen storage alloy ball can be obtained. Then, the hydrogen storage alloy ball is put into a high-pressure tank storing hydrogen, so that the hydrogen storage alloy ball absorbs hydrogen. After the hydrogen absorption is completed, a hydrogen storage alloy ball storing hydrogen can be obtained.

[0056] In addition, the particle size of carbon powder may be 0.5 mm to 3 mm, the particle size of manganese may be 10 to 80 mm, the particle size of aluminum may be 20 to 100 mm, and the particle size of titanium may be 5 to 30 mm.

[0057] S4. During the steel tapping process of the converter, the carbon structure alloy balls and the hydrogen storage alloy balls are added to the molten steel to perform a deoxidation and alloying treatment on the molten steel to obtain the target molten steel.

[0058] In some embodiments, the timing of adding is 1 / 8 to 1 / 6 of the steel being tapped from the converter.

[0059] In the embodiment of the present application, the timing of adding the carbon structure alloy balls and the hydrogen storage alloy balls can be 1 / 8 to 1 / 6 of the time when the converter is tapped, so that the carbon structure alloy balls and the hydrogen storage alloy balls can play a deoxidation role. For example, the timing of adding the above-mentioned can be 1 / 8, 1 / 7, 1 / 6 of the time when the converter is tapped, etc.

[0060] Specifically, S4 includes: when the converter is 1 / 8-1 / 6 of the steel is tapped, carbon structural alloy balls and hydrogen storage alloy balls are sequentially added into the ladle to deoxidize and alloy the molten steel, and the carbon dioxide bubbles released by the decomposition of barium carbonate powder and the hydrogen bubbles released by the hydrogen storage alloy balls carry the inclusions to float, at this time, the target molten steel can be obtained. The target molten steel is then refined to obtain the target carbon silicon manganese steel molten steel, which meets the following requirements: the average oxygen content is not higher than 15ppm, and the number of inclusions is not higher than 8 / mm 2 ; The chemical composition meets the following requirements: carbon content is 0.3% to 0.45%, silicon content is 0.65% to 1%, and manganese content is 1.35% to 1.7%.

[0061] The present application will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are intended only to illustrate the present application and are not intended to limit the scope of the present application. The experimental methods for which specific conditions are not specified in the following examples are usually measured according to national standards. If there is no corresponding national standard, then the conditions recommended by the manufacturer are followed.

[0062] Example 1

[0063] A deoxidation and alloying method for molten steel comprises the following steps:

[0064] S11. Preparation of deoxidized alloy balls: 10 parts of manganese, 5 parts of aluminum, 10 parts of silicon and 5 parts of iron are taken and put into a submerged arc furnace in sequence to melt and mix manganese, aluminum, silicon and iron. After the manganese, aluminum, silicon and iron are melted and mixed, a molten alloy can be obtained. Then, the molten alloy is put into a mold. After the molten alloy is cooled and formed in the mold, a deoxidized alloy ball can be obtained. The particle size of the deoxidized alloy ball is 10 mm.

[0065] S21. Preparation of carbon structure alloy balls: 5 parts of barium carbonate fine powder, 5 parts of calcium oxide, 2 parts of aluminum oxide, 10 parts of carbon powder and 1 part of adhesive are put into a blender, wherein the particle size of the carbon powder is 0.5 mm, the barium carbonate fine powder is 0.1 mm, the particle size of the calcium oxide is 0.1 mm, and the particle size of the aluminum oxide is 0.1 mm. The barium carbonate fine powder, calcium oxide, aluminum oxide, carbon powder and adhesive are mixed by a blender. After the mixing is completed, the mixture is put into a spraying device, and the mixture is coated on the deoxidized alloy ball by the spraying device. The weight ratio of the mixture to the deoxidized alloy ball is 20:80. Then, after the mixture is dried and hardened, the carbon structure alloy ball can be obtained.

[0066] S31. Preparation of hydrogen storage alloy balls: 10 parts of titanium and 5 parts of iron are taken, and put into a submerged arc furnace in sequence to melt and mix the titanium and iron. After the titanium and iron are melted and mixed, a molten alloy can be obtained. Then, the molten alloy is put into a mold. After the molten alloy is cooled and formed in the mold, a hydrogen storage alloy ball can be obtained. The particle size of the hydrogen storage alloy ball is 45 μm. Then, the hydrogen storage alloy ball is put into a high-pressure tank storing hydrogen to make the hydrogen storage alloy ball absorb hydrogen. After the hydrogen absorption is completed, a hydrogen storage alloy ball storing hydrogen can be obtained.

[0067] S41, converter process: when 1 / 8 of the steel is tapped from the converter, carbon structural alloy balls and hydrogen storage alloy balls are sequentially added into the ladle to deoxidize and alloy the molten steel, and inclusions are carried to the surface by carbon dioxide bubbles released by the decomposition of barium carbonate fine powder and hydrogen bubbles released by the hydrogen storage alloy balls. At this time, the target molten steel can be obtained.

[0068] Example 2

[0069] A deoxidation and alloying method for molten steel comprises the following steps:

[0070] S12. Preparation of deoxidized alloy balls: 20 parts of manganese, 10 parts of aluminum, 20 parts of silicon and 10 parts of iron are taken and put into a submerged arc furnace in sequence to melt and mix manganese, aluminum, silicon and iron. After the manganese, aluminum, silicon and iron are melted and mixed, a molten alloy can be obtained. Then, the molten alloy is put into a mold. After the molten alloy is cooled and formed in the mold, a deoxidized alloy ball can be obtained. The particle size of the deoxidized alloy ball is 25 mm.

[0071] S22. Preparation of carbon structure alloy balls: 10 parts of barium carbonate fine powder, 10 parts of calcium oxide, 6 parts of aluminum oxide, 20 parts of carbon powder and 3 parts of adhesive are put into a blender, wherein the particle size of the carbon powder is 1.5 mm, the particle size of the barium carbonate fine powder is 0.6 mm, the particle size of the calcium oxide is 0.6 mm, and the particle size of the aluminum oxide is 0.6 mm. The barium carbonate fine powder, calcium oxide, aluminum oxide, carbon powder and adhesive are mixed by a blender. After the mixing is completed, the mixture is put into a spraying device, and the mixture is coated on the deoxidized alloy ball by the spraying device. The weight ratio of the mixture to the deoxidized alloy ball is 20:80. Then, after the mixture is dried and hardened, the carbon structure alloy ball can be obtained.

[0072] S32. Preparation of hydrogen storage alloy balls: 20 parts of titanium and 10 parts of iron are taken, and put into a submerged arc furnace in sequence to melt and mix the titanium and iron. After the titanium and iron are melted and mixed, a liquid alloy can be obtained. Then, the liquid alloy is put into a mold. After the alloy liquid is cooled and formed in the mold, a hydrogen storage alloy ball can be obtained. The particle size of the hydrogen storage alloy ball is 50 μm. Then, the hydrogen storage alloy ball is put into a high-pressure tank storing hydrogen to make the hydrogen storage alloy ball absorb hydrogen. After the hydrogen absorption is completed, a hydrogen storage alloy ball storing hydrogen can be obtained.

[0073] S42, converter process: when 1 / 7 of the steel is tapped from the converter, carbon structural alloy balls and hydrogen storage alloy balls are sequentially added into the ladle to deoxidize and alloy the molten steel, and inclusions are carried to the surface by carbon dioxide bubbles released by the decomposition of barium carbonate fine powder and hydrogen bubbles released by the hydrogen storage alloy balls. At this time, the target molten steel can be obtained.

[0074] Example 3

[0075] A deoxidation and alloying method for molten steel comprises the following steps:

[0076] S13. Preparation of deoxidized alloy balls: 30 parts of manganese, 15 parts of aluminum, 30 parts of silicon and 15 parts of iron are taken and put into a submerged arc furnace in sequence to melt and mix manganese, aluminum, silicon and iron. After the manganese, aluminum, silicon and iron are melted and mixed, a molten alloy can be obtained. Then, the molten alloy is put into a mold. After the molten alloy is cooled and formed in the mold, a deoxidized alloy ball can be obtained. The particle size of the deoxidized alloy ball is 40 mm.

[0077] S23. Preparation of carbon structure alloy balls: 15 parts of barium carbonate fine powder, 15 parts of calcium oxide, 10 parts of aluminum oxide, 30 parts of carbon powder and 5 parts of adhesive are put into a blender, wherein the particle size of the carbon powder is 3 mm, the particle size of the barium carbonate fine powder is 1 mm, the particle size of the calcium oxide is 1 mm, and the particle size of the aluminum oxide is 1 mm. The barium carbonate fine powder, calcium oxide, aluminum oxide, carbon powder and adhesive are mixed by a blender. After the mixing is completed, the mixture is put into a spraying device, and the mixture is coated on a deoxidized alloy ball by the spraying device. The weight ratio of the mixture to the deoxidized alloy ball is 20:80. Then, after the mixture is dried and hardened, the carbon structure alloy ball can be obtained.

[0078] S33. Preparation of hydrogen storage alloy balls: 30 parts of titanium and 15 parts of iron are taken, and put into a submerged arc furnace in sequence to melt and mix the titanium and iron. After the titanium and iron are melted and mixed, a molten alloy can be obtained. Then, the molten alloy is put into a mold. After the alloy is cooled and formed in the mold, a hydrogen storage alloy ball can be obtained. The particle size of the hydrogen storage alloy ball is 55 μm. Then, the hydrogen storage alloy ball is put into a high-pressure tank storing hydrogen to make the hydrogen storage alloy ball absorb hydrogen. After the hydrogen absorption is completed, a hydrogen storage alloy ball storing hydrogen can be obtained.

[0079] S43, converter process: when 1 / 6 of the steel is tapped from the converter, carbon structural alloy balls and hydrogen storage alloy balls are sequentially added into the ladle to deoxidize and alloy the molten steel, and inclusions are carried to the surface by carbon dioxide bubbles released by the decomposition of barium carbonate fine powder and hydrogen bubbles released by the hydrogen storage alloy balls. At this time, the target molten steel can be obtained.

[0080] Example 4

[0081] A deoxidation and alloying method for molten steel comprises the following steps:

[0082] S14, preparing deoxidized alloy balls: taking 15 parts of manganese, 7 parts of aluminum, 15 parts of silicon and 7 parts of iron, and sequentially putting them into a submerged arc furnace to melt and mix the manganese, aluminum, silicon and iron. After the manganese, aluminum, silicon and iron are melted and mixed, a molten alloy can be obtained. Then, the molten alloy is put into a mold. After the molten alloy is cooled and formed in the mold, a deoxidized alloy ball can be obtained. The particle size of the deoxidized alloy ball is 18 mm.

[0083] S24. Preparation of carbon structure alloy balls: 7 parts of barium carbonate fine powder, 7 parts of calcium oxide, 4 parts of aluminum oxide, 15 parts of carbon powder and 2 parts of adhesive are put into a blender, wherein the particle size of the carbon powder is 1.0 mm, the particle size of the barium carbonate fine powder is 0.3 mm, the particle size of the calcium oxide is 0.3 mm, and the particle size of the aluminum oxide is 0.3 mm. The barium carbonate fine powder, calcium oxide, aluminum oxide, carbon powder and adhesive are mixed by a blender. After the mixing is completed, the mixture is put into a spraying device, and the mixture is coated on the deoxidized alloy ball by the spraying device. The weight ratio of the mixture to the deoxidized alloy ball is 20:80. Then, after the mixture is dried and hardened, the carbon structure alloy ball can be obtained.

[0084] S34. Preparation of hydrogen storage alloy balls: 15 parts of titanium and 7 parts of iron are taken, and put into a submerged arc furnace in sequence to melt and mix the titanium and iron. After the titanium and iron are melted and mixed, a liquid alloy can be obtained. Then, the liquid alloy is put into a mold. After the alloy liquid is cooled and formed in the mold, a hydrogen storage alloy ball can be obtained. The particle size of the hydrogen storage alloy ball is 46 μm. Then, the hydrogen storage alloy ball is put into a high-pressure tank storing hydrogen to make the hydrogen storage alloy ball absorb hydrogen. After the hydrogen absorption is completed, a hydrogen storage alloy ball storing hydrogen can be obtained.

[0085] S44, converter process: when 1 / 8 of the steel is tapped from the converter, carbon structural alloy balls and hydrogen storage alloy balls are sequentially added into the ladle to deoxidize and alloy the molten steel, and inclusions are carried to the surface by carbon dioxide bubbles released by the decomposition of barium carbonate fine powder and hydrogen bubbles released by the hydrogen storage alloy balls. At this time, the target molten steel can be obtained.

[0086] Example 5

[0087] A deoxidation and alloying method for molten steel comprises the following steps:

[0088] S15. Preparation of deoxidized alloy balls: 25 parts of manganese, 12 parts of aluminum, 25 parts of silicon and 12 parts of iron are taken and put into a submerged arc furnace in sequence to melt and mix manganese, aluminum, silicon and iron. After the manganese, aluminum, silicon and iron are melted and mixed, a molten alloy can be obtained. Then, the molten alloy is put into a mold. After the molten alloy is cooled and formed in the mold, a deoxidized alloy ball can be obtained. The particle size of the deoxidized alloy ball is 32 mm.

[0089] S25. Preparation of carbon structure alloy balls: 12 parts of barium carbonate fine powder, 12 parts of calcium oxide, 8 parts of aluminum oxide, 25 parts of carbon powder and 4 parts of adhesive are put into a blender, wherein the particle size of the carbon powder is 2.5 mm, the particle size of the barium carbonate fine powder is 0.8 mm, the particle size of the calcium oxide is 0.8 mm, and the particle size of the aluminum oxide is 0.8 mm. The barium carbonate fine powder, calcium oxide, aluminum oxide, carbon powder and adhesive are mixed by a blender. After the mixing is completed, the mixture is put into a spraying device, and the mixture is coated on the deoxidized alloy ball by the spraying device. The weight ratio of the mixture to the deoxidized alloy ball is 20:80. Then, after the mixture is dried and hardened, the carbon structure alloy ball can be obtained.

[0090] S35. Preparation of hydrogen storage alloy balls: 25 parts of titanium and 12 parts of iron are taken, and put into a submerged arc furnace in sequence to melt and mix the titanium and iron. After the titanium and iron are melted and mixed, a liquid alloy can be obtained. Then, the liquid alloy is put into a mold. After the liquid alloy is cooled and formed in the mold, a hydrogen storage alloy ball can be obtained. The particle size of the hydrogen storage alloy ball is 52 μm. Then, the hydrogen storage alloy ball is put into a high-pressure tank storing hydrogen to make the hydrogen storage alloy ball absorb hydrogen. After the hydrogen absorption is completed, a hydrogen storage alloy ball storing hydrogen can be obtained.

[0091] S45, converter process: when 1 / 7 of the steel is tapped from the converter, carbon structural alloy balls and hydrogen storage alloy balls are sequentially added into the ladle to deoxidize and alloy the molten steel, and inclusions are carried to the surface by carbon dioxide bubbles released by the decomposition of barium carbonate fine powder and hydrogen bubbles released by the hydrogen storage alloy balls. At this time, the target molten steel can be obtained.

[0092] Example 6

[0093] A deoxidation and alloying method for molten steel comprises the following steps:

[0094] S16. Preparation of deoxidized alloy balls: 12 parts of manganese, 6 parts of aluminum, 12 parts of silicon and 6 parts of iron are taken and put into a submerged arc furnace in sequence to melt and mix manganese, aluminum, silicon and iron. After the manganese, aluminum, silicon and iron are melted and mixed, a molten alloy can be obtained. Then, the molten alloy is put into a mold. After the molten alloy is cooled and formed in the mold, a deoxidized alloy ball can be obtained. The particle size of the deoxidized alloy ball is 17 mm.

[0095] S26. Preparation of carbon structure alloy balls: 6 parts of barium carbonate fine powder, 6 parts of calcium oxide, 2 parts of aluminum oxide, 12 parts of carbon powder and 2 parts of adhesive are put into a blender, the particle size of the carbon powder is 0.9 mm, the barium carbonate fine powder is 0.2 mm, the particle size of the calcium oxide is 0.2 mm, and the particle size of the aluminum oxide is 0.2 mm. The barium carbonate fine powder, calcium oxide, aluminum oxide, carbon powder and adhesive are mixed by a blender. After the mixing is completed, the mixture is put into a spraying device, and the mixture is coated on the deoxidized alloy ball by the spraying device. The weight ratio of the mixture to the deoxidized alloy ball is 20:80. Then, after the mixture is dried and hardened, the carbon structure alloy ball can be obtained.

[0096] S36. Preparation of hydrogen storage alloy balls: 12 parts of titanium and 6 parts of iron are taken, and put into a submerged arc furnace in sequence to melt and mix the titanium and iron. After the titanium and iron are melted and mixed, a molten alloy can be obtained. Then, the molten alloy is put into a mold. After the alloy is cooled and formed in the mold, a hydrogen storage alloy ball can be obtained. The particle size of the hydrogen storage alloy ball is 47 μm. Then, the hydrogen storage alloy ball is put into a high-pressure tank storing hydrogen to make the hydrogen storage alloy ball absorb hydrogen. After the hydrogen absorption is completed, a hydrogen storage alloy ball storing hydrogen can be obtained.

[0097] S46, converter process: when 1 / 6 of the steel is tapped from the converter, carbon structural alloy balls and hydrogen storage alloy balls are sequentially added into the ladle to deoxidize and alloy the molten steel, and inclusions are carried to the surface by carbon dioxide bubbles released by the decomposition of barium carbonate fine powder and hydrogen bubbles released by the hydrogen storage alloy balls. At this time, the target molten steel can be obtained.

[0098] Comparative Example 1

[0099] When the converter is tapping steel, add aluminum-iron deoxidizer (2.0 kg per ton of molten steel) into the ladle when the tapping amount reaches 1 / 4 to obtain the target molten steel.

[0100] The target molten steel obtained by converter smelting in Examples 1 to 6 and Comparative Examples 1 to 1 is subjected to LF refining, and the specific steps are: the molten steel produced by the converter is sent to the LF refining station, the power is turned on to heat the molten steel, and slag-making materials such as lime and fluorite are added to form a high-basicity slag system to remove impurities such as sulfur and phosphorus. Then, alloys such as ferrosilicon and ferromanganese are added according to the test results to adjust the chemical composition of the molten steel. During the process, strong stirring argon is used to enhance the reaction kinetics conditions, promote the removal of inclusions and the homogenization of the composition, so as to obtain the target carbon-silicon-manganese steel liquid.

[0101] The properties of the target carbon-silicon-manganese steel liquids obtained in Examples 1 to 6 and Comparative Example 1 were evaluated. Please refer to Table 1 for the average oxygen content and the number of inclusions in the target carbon-silicon-manganese steel liquids. Please refer to Table 2 for the chemical composition of the target carbon-silicon-manganese steel liquids.

[0102] Table 1 Average oxygen content and inclusion number of target carbon-silicon-manganese steel liquid

[0103] Serial number Average oxygen content / ppm <![CDATA[Number of inclusions per mm 2 > Example 1 15 8 Example 2 15 7 Example 3 14 7 Example 4 12 5 Example 5 10 4 Example 6 14 7 Comparative Example 1 18 12

[0104] Table 2 Chemical composition of target carbon-silicon-manganese steel liquid (wt%)

[0105]

[0106]

[0107] It can be seen from Table 1 and Table 2 that the molten steels of Examples 1 to 6 are superior to those of Comparative Example 1 in terms of average oxygen content and the number of inclusions, and are more reasonable in terms of the ratio of chemical components, which helps to improve the quality and performance of the molten steel.

[0108] One or more technical solutions in the embodiments of the present application also have at least the following technical effects or advantages:

[0109] (1) The carbon structure alloy ball containing barium carbonate fine powder plays an important role. When the barium carbonate fine powder decomposes, it will produce carbon dioxide bubbles, which can effectively carry inclusions to float. This process significantly improves the removal effect of inclusions in molten steel, taking a key step towards improving the cleanliness of molten steel;

[0110] (2) Put in hydrogen storage alloy balls containing hydrogen. Under certain conditions, the hydrogen bubbles generated by the decomposition of the hydrogen storage alloy balls also have the ability to carry inclusions to float. This dual bubble action mechanism makes the removal of inclusions more thorough, especially for common and difficult-to-remove inclusions such as CaO-SiO2 or CaO-MnO-SiO2. The effect is particularly significant;

[0111] (3) The synergistic combination of barium carbonate fine powder and hydrogen storage alloy balls can not only further remove complex inclusions in the molten steel, but also significantly improve the cleanliness of the molten steel. This breakthrough provides a strong guarantee for the stability and improvement of the quality of the steel billet in the subsequent process, meets the strict requirements for the composition of the steel billet, and effectively reduces the risk of quality defects caused by residual inclusions;

[0112] (4) The problem of removing inclusions from molten steel was solved, the cleanliness of the molten steel was significantly improved, and the composition requirements of the quality of the steel billets in the subsequent process were effectively guaranteed. This not only improved the quality and performance of the products, but also enhanced the stability and controllability of the production process, providing new ideas and methods for the high-quality development of the steel industry.

[0113] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A method for deoxidation and alloying of molten steel, characterized in that: The method comprises: Obtaining deoxidized alloy balls; Applying a first material to at least a portion of the surface of the deoxidized alloy ball to obtain a carbon structure alloy ball; wherein the first material includes barium carbonate powder; A hydrogen storage alloy ball is obtained; During the steel tapping process of the converter, the carbon structure alloy balls and the hydrogen storage alloy balls are added to the molten steel to perform deoxidation and alloying treatment on the molten steel to obtain the target molten steel.

2. The method according to claim 1, characterized in that The method for obtaining the deoxidized alloy ball comprises: The second material is melted and then formed to obtain a deoxidized alloy ball; wherein the second material includes: manganese, aluminum, silicon and iron, in parts by weight, The content of manganese is 10 to 30 parts, the content of aluminum is 5 to 15 parts, the content of silicon is 10 to 30 parts, and the content of iron is 5 to 15 parts.

3. The method according to claim 1, characterized in that: In the first material, the content of the barium carbonate powder is 5 to 15 parts by weight.

4. The method according to claim 1 or 3, characterized in that: The first material also includes: calcium oxide, aluminum oxide and carbon powder; wherein, by weight, The content of calcium oxide is 5 to 15 parts, the content of aluminum oxide is 2 to 10 parts, and the content of carbon powder is 10 to 30 parts.

5. The method according to claim 1, characterized in that The weight ratio of the first material to the deoxidized alloy ball is 20:

80.

6. The method according to claim 1, characterized in that The method for obtaining the hydrogen storage alloy ball comprises: The third material is melted and then formed to obtain an alloy ball to be used for hydrogen storage; wherein the third material comprises titanium and iron; in parts by weight, the content of titanium is 10 to 30 parts, and the content of iron is 5 to 15 parts.

7. The method according to claim 1, characterized in that The timing of adding is 1 / 8 to 1 / 6 of the steel being tapped from the converter.

8. The method according to claim 1, characterized in that The particle size of the deoxidized alloy ball is 10 mm to 40 mm.

9. The method according to claim 1, characterized in that: The particle size of the barium carbonate powder is 0.1 mm to 1 mm.

10. The method according to claim 1, characterized in that The particle size of the hydrogen storage alloy ball is 45 μm to 55 μm.

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