A method of producing a steel for a container

Abstract

The application discloses a production method of a container steel, and mainly solves the technical problem of high production cost of the existing container steel. The technical scheme is as follows: a production method of a container steel, comprising the following steps: 1) adopting top and bottom combined blowing converter smelting; 2) controlling the oxygen lance position, oxygen supply intensity, bottom blowing intensity and slag auxiliary materials in the converter smelting process; 3) controlling the converter smelting end point; 4) controlling the converter tapping; 5) refining treatment of the molten steel blowing argon station, transporting the molten steel in the ladle to the blowing argon station for treatment, feeding the titanium iron wire into the molten steel, and controlling the w[Ti] in the molten steel to be 0.02%-0.04%; weak stirring is conducted on the molten steel after the titanium iron wire is fed, the argon flow of the weak stirring is 20-80L / min, the weak stirring molten steel is stirred for 5-6 minutes, and the finished molten steel is obtained; and 6) continuously casting the finished molten steel by using a slab continuous casting machine, and obtaining a continuous casting slab. The number of the tundish continuous casting furnaces of the finished molten steel is greater than or equal to 15.

Description

Technical Field

[0001] This invention relates to a method for producing steel, and more particularly to a method for producing steel for containers, belonging to the field of steel smelting and continuous casting technology. Background Technology

[0002] One of the fundamental tasks of steelmaking is to remove phosphorus from steel, as phosphorus reduces its toughness. For most steel grades, the lower the phosphorus content, the better. However, for steel used in containers, phosphorus is a very beneficial element. Adding a certain amount of phosphorus to the finished product can improve the steel's hardness and resistance to atmospheric corrosion, enhance its impact resistance, and ensure excellent weather resistance.

[0003] The current conventional process for steelmaking for containers is: hot metal desulfurization → converter → LF furnace → continuous casting. The LF furnace refining process achieves deoxidation and alloying of the molten steel. The phosphorus control process involves: converter dephosphorization → refining and phosphorus enrichment. The converter removes phosphorus from the hot metal to a low level, and ferrophosphorus alloy is added during refining to alloy the steel. This process has several problems: 1) Cost-wise, converter dephosphorization consumes excessive flux, and refining and phosphorus enrichment consume excessive ferrophosphorus alloy, resulting in wasted costs; 2) Quality-wise, the high content of impurities in the ferrophosphorus alloy, especially oxygen and titanium, leads to a decrease in steel cleanliness during refining and phosphorus enrichment; 3) Efficiency-wise, the large fluctuations in phosphorus content at the end of converter smelting mean that the refining process primarily uses the LF furnace, resulting in high steel production costs.

[0004] Chinese patent application CN103131817A discloses a method for phosphorus retention in converter steelmaking. By controlling the slag basicity to 2.0-2.8 and controlling the lance position during the overblowing process, and by rationally balancing and controlling the peak dephosphorization before and after smelting, a phosphorus retention rate of 30%-70% is achieved in the molten iron without adding phosphate ore. This method requires the converter smelting endpoint temperature to be controlled at 1665-1710℃; higher temperatures are beneficial for phosphorus retention, but result in higher steel production costs.

[0005] Existing technologies lack control methods for smelting container steel using the direct argon blowing process, especially addressing the challenges of phosphorus retention control at lower temperatures at the end of converter smelting and steel cleanliness control under short refining times. Summary of the Invention

[0006] The purpose of this invention is to provide a method for producing steel for containers, which mainly solves the technical problem of high production cost of existing container steel. The method of this invention improves the cleanliness of molten steel, solves the technical problems of phosphorus retention in converter and control of inclusions in refining when producing container steel using argon blowing process, provides support for continuous casting of molten steel for containers in tundishes with ≥15 heats, and significantly reduces the smelting cost of container steel.

[0007] The technical concept of this invention is that the container steel produced by this method is not aluminum-killed steel. By employing low oxidation control at the end of converter smelting and a stepwise deoxidation process of silicon and titanium in the molten steel, the steelmaking process does not use ferrophosphorus alloys or any aluminum alloys, and the aluminum content in the ferrosilicon alloy is controlled to obtain molten steel with an aluminum content of less than 0.004%, minimizing Al2O3 inclusions and thus suppressing Al2O3-TiO2. x The formation of inclusions; starting from three aspects, namely low oxidation at the end of converter smelting, steel deoxidation, and low aluminum control, the cleanliness of molten steel was improved, and the argon blowing direct process was used to continuously cast ≥15 heats of tundish steel for container steel.

[0008] The technical solution adopted in this invention is a method for producing steel for containers, comprising the following steps:

[0009] 1) The smelting process adopts a top-and-bottom blown converter. The mass percentage of the raw materials used in the main metal materials is 80%-90% iron and the remainder is light scrap steel. Argon is blown into the bottom throughout the smelting process. The w[P] in the iron is 0.12%-0.15% and w[S]≤0.0040%.

[0010] 2) Control of the converter smelting process, including the oxygen lance position, oxygen supply intensity, bottom blowing intensity and slag-forming auxiliary materials. The converter slag-forming auxiliary materials are lime and light-burned dolomite. The amount of lime added is 5-15 kg / t steel and the amount of light-burned dolomite added is 20-30 kg / t steel.

[0011] In the early stages of converter smelting, the oxygen supply should be controlled at 30%-40% of the total oxygen supply for each smelting furnace, with an oxygen intensity of 3.8-4.0 Nm³. 3 / (min·t), bottom blowing gas supply intensity is 0.12-0.15 Nm 3 / (min·t), with the oxygen lance height as the reference lance position, when the oxygen lance is ignited, add 50% of the total amount of lightly calcined dolomite; when the oxygen blowing rate is 10%-15% of the total oxygen supply by mass, add the remaining lightly calcined dolomite; when the oxygen blowing rate is 20%-25% of the total oxygen supply by mass, add 50% of the total amount of lime.

[0012] During the mid-term control of converter smelting, the oxygen supply should be 40%-50% of the total oxygen supply for the smelting furnace, and the oxygen intensity should be controlled at 3.3-3.6 Nm³. 3 / (min·t), bottom blowing gas supply intensity is 0.03-0.05 Nm 3 / (min·t), when the oxygen blowing rate is 40%-45% of the total oxygen supply by mass, the oxygen lance height is at the high lance position; when the oxygen blowing rate is 50%-55% of the total oxygen supply by mass, the oxygen lance height is at the reference lance position; when the oxygen blowing rate is 45%-50% of the total oxygen supply by mass, add the remaining lime.

[0013] In the later stages of converter smelting, the oxygen supply should be controlled at 20%-30% of the total oxygen supply for the entire smelting cycle, with an oxygen intensity of 3.3-4.0 Nm³. 3 / (min·t), bottom blowing gas supply intensity is 0.08-0.12 Nm 3 / (min·t); When the oxygen blowing rate is 80%-90% of the total oxygen supply by mass, the oxygen lance height is at the low lance position. The temperature (w[C]) and volume (temperature) in the molten pool are measured using a secondary lance. When w[C] is 0.8%-0.9%, the oxygen supply intensity is controlled at 3.3-3.4 Nm. 3 / (min·t); When w[C] is 0.7%-0.8%, the oxygen supply intensity should be controlled at 3.5-3.6 Nm. 3 / (min·t); When w[C] is 0.6%-0.7%, the oxygen supply intensity should be controlled at 3.7-3.8 Nm. 3 / (min·t); When w[C] is 0.5%-0.6%, the oxygen supply intensity should be controlled at 3.9-4.0 Nm. 3 / (min·t); The binary basicity (w(CaO) / w(SiO2)) of the slag at the end of the converter smelting is controlled to be 1.5-2.5, and the MgO mass fraction in the slag at the end of the converter smelting is 13%-15%;

[0014] 3) Control of the endpoint of converter smelting: control the carbon-oxygen product at the endpoint of converter smelting to be 0.0010-0.0020, and take samples to detect w[O] and temperature of molten steel at the endpoint of converter smelting. When w[O] in molten steel at the endpoint of converter smelting is detected to be 0.012%-0.032% and temperature of molten steel at the endpoint of converter smelting is 1630-1655℃, converter smelting ends.

[0015] 4) Converter tapping control: Steel is tapped immediately after converter smelting. The bottom blowing gas in the ladle is argon, with a gas supply flow rate of 400-500 L / min. When the amount of molten steel tapped from the converter reaches 20%-25% of the total molten steel, ferrosilicon, ferromanganese, ferrochrome, and carbon powder are added to the ladle in sequence. After the alloys are added, the argon flow rate is adjusted to 500-600 L / min, and desulfurization lime is added to the ladle at a rate of 1.6-2.4 kg / t steel.

[0016] 5) Refining treatment at the argon blowing station: The molten steel in the ladle is transported to the argon blowing station for treatment. The argon flow rate is adjusted to 600-800 L / min, and the molten steel is stirred for 3-5 minutes. Then, the argon flow is stopped, and the oxygen content and temperature of the molten steel are measured. Argon is then introduced into the molten steel again, controlling the argon flow rate at 200-300 L / min, and the molten steel is stirred for 4-6 minutes, adjusting the temperature to 1580-1595℃. Titanium iron wire is fed into the molten steel, controlling the w[Ti] content to 0.02%-0.04%. The molten steel after feeding the titanium iron wire is then weakly stirred. The argon flow rate for stirring is 20-80 L / min, and the molten steel is weakly stirred for 5-6 minutes to obtain the finished molten steel. The chemical composition of the finished molten steel by weight percentage is as follows: C: 0.07%-0.10%, Si: 0.45%-0.60%, Mn: 0.25%-0.40%, P: 0.07%-0.114%, S≤0.015%, Cr: 0.3%-0.45%, Ti: 0.02%-0.04%, Cu: 0.25%-0.35%, Al<0.004%, N≤0.006%, with the balance being Fe and residual elements.

[0017] 6) Use a slab continuous casting machine to continuously cast the finished molten steel to obtain a continuously cast slab.

[0018] The finished steel of this invention is cast using a slab continuous casting machine, and the number of continuous castings in the tundish is ≥15 heats.

[0019] In step 2) of this invention, the reference position of the oxygen lance in the converter is H0 + H0*(0.20-0.30), the high position is controlled by H0 + H0*(0.35-0.50), and the low position is controlled by H0 + H0*(0.10-0.15), where H0 is the height of the molten steel level in the converter.

[0020] In step 3) of this invention, the carbon-oxygen product at the end of converter smelting is the product of the carbon weight percentage and the oxygen weight percentage of the molten steel at the end of converter smelting. The carbon-oxygen product at the end of converter smelting is 0.0012-0.0016, which has good effect.

[0021] In step 3) of this invention, the w[P] in the molten steel at the end of the converter smelting is 0.0880%-0.1040%.

[0022] In step 4) of this invention, the chemical composition of ferrosilicon is as follows by weight percentage: Si: 71-76%, Al≤1.2%, and the balance is Fe; the amount of ferrosilicon alloy added is 7.0-8.5 kg / t steel.

[0023] In step 5) of this invention, the chemical composition of the titanium-iron wire by weight percentage is: Ti: 65-75%, N≤0.08%, O≤0.5%, Al≤0.5%, with the balance being Fe.

[0024] The reasons for determining the process control parameters in this invention are as follows:

[0025] When using the argon-blown direct-fired process to smelt container steel, a certain amount of aluminum alloy or aluminum wire needs to be added to deoxidize and alloy the molten steel. The aluminum content in the steel is above 0.005%, and is actually controlled above 0.01%, resulting in aluminum-killed steel. Problems with the existing process include: 1) At the end of converter smelting, w[O] in the molten steel is ≥0.035%. Due to the high oxygen content, the dephosphorization rate in the converter increases, requiring the addition of ferrophosphorus alloy during tapping. Ferrophosphorus alloy has a high content of harmful impurities, and the amount of deoxidation products increases, which is detrimental to the control of molten steel cleanliness; 2) Using aluminum deoxidation cannot avoid the generation of high-melting-point Al2O3 inclusions; 3) The aluminum content in the molten steel is ≥0.005%, generally above 0.01%. Simultaneously, the molten steel contains titanium, and the ferrotitanium alloy contains oxygen, causing Al2O3-TiO to be generated in the molten steel during ferrotitanium alloying. x Mixed materials.

[0026] Based on the applicant's research findings, the method of this invention improves the cleanliness of molten steel by controlling low oxidation at the converter smelting endpoint, steel deoxidation, and low aluminum content in molten steel, thus enabling the direct argon blowing process for smelting container steel. First, low oxidation control at the converter smelting endpoint increases the phosphorus content to 0.0882%-0.1039%, avoiding the use of ferrophosphorus alloys. Second, a silicon-titanium stepwise deoxidation process replaces the traditional aluminum deoxidation process, enhancing the deoxidation capacity of ferrosilicon while maintaining low oxidation in the molten steel. The oxygen content in the molten steel at the argon blowing station is <0.004%, eliminating the need for ferroaluminum alloys or aluminum wire deoxidation and significantly suppressing the formation of Al2O3 inclusions. Finally, controlling w[Al] in the molten steel to <0.0040% inhibits Al2O3-TiO3 formation at its source. x The formation of inclusions ensures that the number of tundishes cast in a continuous process is ≥15.

[0027] 1. Setting of low-oxidation control parameters at the end point of converter smelting

[0028] Since the oxygen content in the molten steel at the end of converter smelting directly affects the carbon and phosphorus content, too low an oxygen content easily leads to carbon and phosphorus content exceeding the upper limit; while too high an oxygen content requires increased deoxidizer consumption and results in low phosphorus content, leading to increased deoxidation output and the addition of ferrophosphorus alloy. By controlling the oxygen lance position, oxygen supply intensity, bottom blowing intensity, and slag-forming auxiliary materials during the converter smelting process, and by measuring the carbon content of the molten pool using a secondary lance during smelting, the carbon content is controlled at 0.5%-0.9%. A higher carbon content is beneficial for adjusting the end-of-converter temperature and achieving high carbon content; simultaneously, by utilizing a lower carbon-oxygen product (0.0010-0.0020 at the end of converter smelting) and controlling the low oxidizing properties at the end of converter smelting (w[O] in the molten steel at the end of converter smelting is 0.012%-0.032%), w[P] in the molten steel at the end of converter smelting can be controlled at 0.0880%-0.1040%.

[0029] 2. Setting of deoxidation control parameters for molten steel

[0030] The steel employs a silicon-titanium stepwise deoxidation process instead of the traditional aluminum deoxidation process. Silicon deoxidation is used during the converter tapping process, while titanium deoxidation is combined with silicon deoxidation at the argon blowing station to achieve steel deoxidation. Since the deoxidation product of silicon is SiO2 and its deoxidation capacity is limited, increasing the deoxidation output will further inhibit silicon's deoxidation ability. By controlling the low oxidizing activity at the converter smelting endpoint, the deoxidation capacity of silicon is enhanced, resulting in a rapid decrease in the oxidizing activity of the molten steel. During the argon blowing station refining process, strong stirring is used to fully facilitate the slag-metal reaction, thereby reducing the oxidizing activity of the ladle slag and promoting the flotation and removal of inclusions. After all inclusions generated during tapping have floated to the surface, titanium-iron wire is fed into the molten steel. This further deoxidizes the steel and alloys it with titanium. Weak stirring is then applied to promote inclusion flotation and ensure uniform steel composition.

[0031] 3. Setting of aluminum content control parameters in molten steel

[0032] Because aluminum and oxygen have a very strong affinity, Al2O3 inclusions will inevitably form when molten steel is deoxidized with aluminum or contains aluminum. If w[Al] ≥ 0.004% in the molten steel, Al2O3-TiO will be generated during the titanium alloying and secondary oxidation processes during steel casting, due to the presence of titanium in the molten steel. x Inclusions, as the number of tundish casting furnaces increases, Al2O3-TiO x As inclusions gradually accumulate, the castability of molten steel deteriorates, affecting the number of consecutive casting heats in the tundish. By not adding any aluminum alloy during the converter tapping and molten steel refining process, and controlling w[Al] in the molten steel to <0.0040%, the generation of Al2O3 inclusions can be suppressed to the maximum extent, ensuring the castability of molten steel and providing support for the number of consecutive casting heats of 15 heats in the tundish for container steel.

[0033] Compared with existing technologies, this invention has the following positive effects: 1. The method of this invention adopts low oxidation control at the endpoint of converter smelting, controlling the w[O] in the molten steel at the endpoint of converter smelting to 0.012%-0.032%, which can reduce deoxidation output and increase the phosphorus content in the molten steel at the endpoint of converter smelting, avoiding the addition of ferrophosphorus alloy. 2. The method of this invention uses a silicon-titanium stepwise deoxidation process to replace the traditional aluminum deoxidation process, which greatly inhibits the generation of Al2O3 inclusions. 3. The method of this invention controls the w[Al] in the finished molten steel to <0.004%, which can inhibit Al2O3-TiO3 from the source. x The formation of inclusions ensures that the number of tundishes cast in a continuous process is ≥15. Detailed Implementation

[0034] The present invention will be further illustrated below with reference to specific embodiments 1 to 5.

[0035] Examples 1-5 of the invention use a 250-ton top-and-bottom blown converter to smelt SPA-H steel as an example; the production method includes: converter smelting, argon blowing station steel treatment, and continuous casting of molten steel. The control parameters for steel production in the embodiments of the present invention are shown in Tables 1 to 8.

[0036] Table 1 Parameters of metal materials for converter smelting in embodiments of the present invention

[0037]

[0038] Table 2 Control parameters for converter smelting process

[0039]

[0040] Table 3. Control of charging during converter smelting process and slag composition at the end of converter smelting.

[0041]

[0042] Table 4. Converter smelting process and final steel composition and temperature at the converter smelting endpoint

[0043]

[0044]

[0045] Table 5. Converter tapping and charging control parameters

[0046] Example 1 2.2 7.54 3.11 6.36 0 Example 2 1.9 7.44 2.96 7.01 0 Example 3 2.1 7.33 3.02 6.28 0 Example 4 1.8 8.09 2.82 7.16 0 Example 5 2.3 8.08 2.98 7.09 0.12

[0047] Table 6. Composition and temperature of molten steel entering the argon blowing station

[0048]

[0049] Table 7 Argon Blowing Station Processing Parameters

[0050] Example 1 0.31 36 5.8 Example 2 0.32 42 5.9 Example 3 0.32 54 5.8 Example 4 0.30 41 5.4 Example 5 0.31 54 5.2

[0051] Table 8. Composition of molten steel leaving the argon blowing station, unit: wt%

[0052]

[0053] In addition to the embodiments described above, the present invention may have other implementations. All technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by the present invention.

Claims

1. A method for producing steel for containers, characterized in that, The method includes the following steps: 1) The smelting process adopts a top-and-bottom blown converter. The mass percentage of the raw materials used in the main metal materials is 80%-90% iron and the remainder is light scrap steel. Argon is blown into the bottom throughout the smelting process. The w[P] in the iron is 0.12%-0.15% and w[S]≤0.0040%. 2) Control of the converter smelting process, including the oxygen lance position, oxygen supply intensity, bottom blowing intensity and slag-forming auxiliary materials. The converter slag-forming auxiliary materials are lime and light-burned dolomite. The amount of lime added is 5-15 kg / t steel and the amount of light-burned dolomite added is 20-30 kg / t steel. In the early stages of converter smelting, the oxygen supply should be controlled at 30%-40% of the total oxygen supply for each smelting furnace, with an oxygen intensity of 3.8-4.0 Nm³. 3 / (min·t), bottom blowing gas supply intensity is 0.12-0.15 Nm 3 / (min·t), with the oxygen lance height as the reference lance position, when the oxygen lance is ignited, add 50% of the total amount of lightly calcined dolomite; when the oxygen blowing rate is 10%-15% of the total oxygen supply by mass, add the remaining lightly calcined dolomite; when the oxygen blowing rate is 20%-25% of the total oxygen supply by mass, add 50% of the total amount of lime. During the mid-term control of converter smelting, the oxygen supply should be 40%-50% of the total oxygen supply for the smelting furnace, and the oxygen intensity should be controlled at 3.3-3.6 Nm³. 3 / (min·t), bottom blowing gas supply intensity is 0.03-0.05 Nm 3 / (min·t), when the oxygen blowing rate is 40%-45% of the total oxygen supply by mass, the oxygen lance height is at the high lance position; when the oxygen blowing rate is 50%-55% of the total oxygen supply by mass, the oxygen lance height is at the reference lance position; when the oxygen blowing rate is 45%-50% of the total oxygen supply by mass, add the remaining lime. In the later stages of converter smelting, the oxygen supply should be controlled at 20%-30% of the total oxygen supply for the entire smelting cycle, with an oxygen intensity of 3.3-4.0 Nm³. 3 / (min·t), bottom blowing gas supply intensity is 0.08-0.12 Nm 3 / (min·t); When the oxygen blowing rate is 80%-90% of the total oxygen supply by mass, the oxygen lance height is at the low lance position. The temperature (w[C]) and volume (temperature) in the molten pool are measured using a secondary lance. When w[C] is 0.8%-0.9%, the oxygen supply intensity is controlled at 3.3-3.4 Nm. 3 / (min·t); When w[C] is 0.7%-0.8%, the oxygen supply intensity should be controlled at 3.5-3.6 Nm. 3 / (min·t); When w[C] is 0.6%-0.7%, the oxygen supply intensity should be controlled at 3.7-3.8 Nm. 3 / (min·t); When w[C] is 0.5%-0.6%, the oxygen supply intensity should be controlled at 3.9-4.0 Nm. 3 / (min·t); The binary basicity (w(CaO) / w(SiO2)) of the slag at the end of the converter smelting is controlled to be 1.5-2.5, and the MgO mass fraction in the slag at the end of the converter smelting is 13%-15%; 3) Control of the endpoint of converter smelting: control the carbon-oxygen product at the endpoint of converter smelting to be 0.0010-0.0020, and take samples to detect w[O] and temperature of molten steel at the endpoint of converter smelting. When w[O] in molten steel at the endpoint of converter smelting is detected to be 0.012%-0.032% and temperature of molten steel at the endpoint of converter smelting is 1630-1655℃, converter smelting ends. 4) Converter tapping control: Steel is tapped immediately after converter smelting. The bottom blowing gas in the ladle is argon, with a gas supply flow rate of 400-500 L / min. When the amount of molten steel tapped from the converter reaches 20%-25% of the total molten steel, ferrosilicon, ferromanganese, ferrochrome, and carbon powder are added to the ladle in sequence. After the alloys are added, the argon flow rate is adjusted to 500-600 L / min, and desulfurization lime is added to the ladle at a rate of 1.6-2.4 kg / t steel. 5) Refining treatment at the argon blowing station: The molten steel in the ladle is transported to the argon blowing station for treatment. The argon flow rate is adjusted to 600-800 L / min, and the molten steel is stirred for 3-5 minutes. Then, the argon flow is stopped, and the oxygen content and temperature of the molten steel are measured. Argon is then introduced into the molten steel again, controlling the argon flow rate at 200-300 L / min, and the molten steel is stirred for 4-6 minutes, adjusting the temperature to 1580-1595℃. Titanium iron wire is fed into the molten steel, controlling the w[Ti] content to 0.02%-0.04%. The molten steel after feeding the titanium iron wire is then weakly stirred. The argon flow rate for stirring is 20-80 L / min, and the molten steel is weakly stirred for 5-6 minutes to obtain the finished molten steel. The chemical composition of the finished molten steel by weight percentage is as follows: C: 0.07%-0.10%, Si: 0.45%-0.60%, Mn: 0.25%-0.40%, P: 0.07%-0.114%, S≤0.015%, Cr: 0.3%-0.45%, Ti: 0.02%-0.04%, Cu: 0.25%-0.35%, Al<0.004%, N≤0.006%, with the balance being Fe and residual elements. 6) Use a slab continuous casting machine to continuously cast the finished molten steel to obtain a continuously cast slab.

2. The method for producing container steel as described in claim 1, characterized in that, In step 2), the reference position of the converter oxygen lance is H0 + H0 * (0.20 - 0.30), the high lance position is H0 + H0 * (0.35 - 0.50), and the low lance position is: H0+H0*(0.10-0.15), where H0 is the height of the molten steel level in the converter.

3. The method for producing container steel as described in claim 1, characterized in that, The final carbon-oxygen product of the converter smelting is 0.0012-0.0016.

4. The method for producing container steel as described in claim 1, characterized in that, The final concentration of w[P] in the molten steel during converter smelting is 0.0880%-0.1040%.

5. The method for producing container steel as described in claim 1, characterized in that, In step 4), the chemical composition of the ferrosilicon is as follows by weight percentage: Si: 71-76%, Al≤1.2%, with the balance being Fe; the amount of ferrosilicon alloy added is 7.0-8.5 kg / t steel.

6. The method for producing container steel as described in claim 1, characterized in that, In step 5), the chemical composition of the titanium-iron wire by weight percentage is: Ti: 65-75%, N≤0.08%, O≤0.5%, Al≤0.5%, with the balance being Fe.

7. The method for producing container steel as described in claim 1, characterized in that, The finished molten steel is cast using a slab continuous casting machine, and the number of continuous castings in the tundish is ≥15 heats.

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