Sulfur content control method for SPA-H weathering resistant steel

Abstract

The invention relates to the technical field of smelting, in particular to an SPA-H weathering steel sulfur content control method which comprises the steps of molten iron smelting, converter smelting and refining. The low-sulfur molten iron is not pretreated, and the sulfur content is controlled to be smaller than or equal to 0.010% through converter smelting, converter tapping and argon station treatment. According to the method, the pretreatment proportion of the SPA-H container molten steel is reduced, rapid desulfurization is conducted through the converter and the argon station, the sulfur content of the SPA-H steel for the container meets the steel grade requirement, desulfurization procedures are reduced, and desulfurizer consumption, energy consumption and molten iron scrabbling loss are reduced. The new operation method for rapid desulfurization of the SPA-H steel converter is realized, the cost of the desulfurization process is reduced, the process time is shortened, and the production efficiency of the converter is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of smelting, and in particular relates to a method for controlling the sulfur content of SPA-H weathering steel. Background Art

[0002] In actual steel mill production, SPA-H steel for containers is a common weathering steel. It is smelted in a converter using desulfurized hot metal to ensure the steel's sulfur content meets acceptable standards. Because the production of SPA-H container steel requires hot metal pretreatment, process costs increase significantly. These factors, including desulfurization powder, energy consumption, and hot metal scraping losses, significantly impact profitability. This invention achieves sulfur content control through iron selection, direct hot metal transfer to the converter, and rapid desulfurization in the converter.

[0003] Patent CN202210330382.9 discloses a smelting method for efficient desulfurization at the converter end point, comprising the following steps: (1) double slag smelting, wherein 20-35% of the slag is discharged at 240s-270s of blowing; (2) 50-60% of the slag is discharged at the converter end point; (3) the converter end point temperature is controlled to be greater than 1650°C, and the temperature after the slag is discharged at the converter end point is greater than 1640°C; (4) the oxygen content of the molten steel is controlled to be less than 500ppm after the slag is discharged at the converter end point; (5) a desulfurizer and a deoxidizer are added to the converter for rapid deoxidation; (6) the converter is started for composite stirring desulfurization; (7) composite stirring is performed for 4-7 minutes, the desulfurization rate reaches 45-80%, the desulfurization is completed, and the steel is discharged normally; the process flow of the present invention is simple and clear, the operability is strong, and it is easy to control, thereby improving the converter desulfurization efficiency, moving the desulfurization task forward to the converter body, effectively reducing the S after the converter argon, canceling the LF process or reducing the desulfurization pressure of the LF furnace, and saving costs. There are problems with this patent: it only focuses on the desulfurization process of the converter smelting process, and does not introduce the converter steelmaking process and the argon station desulfurization process. The converter steelmaking process and the argon station slag washing process are not involved and introduced.

[0004] Patent CN202310526898.5 discloses a rapid desulfurization method for converter smelting, comprising: adding a desulfurizer to a ladle and spraying an inert gas into the ladle for desulfurization during the converter smelting and tapping process; after tapping, removing the desulfurization slag. The present invention effectively utilizes the impact force and heat source of the molten steel during the tapping process to desulfurize, achieving efficient and low-cost desulfurization of the molten iron. However, this patent has problems: it only addresses converter desulfurization and the post-desulfurization slag removal process, but does not describe the selection of undesulfurized molten iron, converter tapping, and argon station desulfurization processes, nor does it involve or introduce the converter tapping process and argon station slag washing process. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a method for controlling the sulfur content of SPA-H weathering steel, thereby reducing the proportion of molten iron pretreatment and lowering costs.

[0006] To achieve the above objectives, the present invention adopts the following technical solutions:

[0007] A method for controlling the sulfur content of SPA-H weathering steel includes molten iron, converter smelting, and refining; the low-sulfur molten iron is not pretreated, and the sulfur content is controlled to ≤ 0.010% through converter smelting, converter tapping, and argon station treatment, specifically comprising:

[0008] 1) When the molten iron S is less than 0.035%, it is not pre-treated and is added directly to the converter or after slagging. When the molten iron S is greater than or equal to 0.035%, it is added to the converter after pre-treatment.

[0009] 2) Adding active lime to converter smelting:

[0010] If the sulfur content of the molten iron in the converter is greater than 0.010%, the amount of active lime added = 3 × (molten iron sulfur - 0.0100%) × 10,000, unit: kg / t steel;

[0011] If the sulfur content of molten iron entering the furnace is ≤0.0100%, there is no need to increase the amount of lime added;

[0012] 3) The tapping temperature of the converter shall not be lower than 1675°C, and the temperature after tapping shall not be lower than 1625°C;

[0013] The converter end point sulfur is greater than 0.010%, and the amount of lime added to the cover tank during the converter tapping process is ≥ 2.5 + 2 × (converter end point sulfur - 0.0100%) × 10000, kg / t steel;

[0014] If the sulfur content of the converter is ≤0.0100%, the amount of lime added to the cover tank is 2.5-3.0 kg / t steel;

[0015] If the converter end point S is greater than 0.010%, the amount of aluminum powder added after the converter tapping is ≥ 0.2 × (converter end point sulfur - 0.0100%) × 10000, kg / t steel, and the argon station sulfur is ≤ 0.0100%, then aluminum powder is not added after the converter tapping;

[0016] If the converter end point S is greater than 0.010%, the amount of aluminum wire added to the converter steel tapping should be ≥ 0.1 × (converter end point sulfur - 0.0100%) × 10,000, kg / t steel, and the argon station sulfur is ≤ 0.0100%, then there is no need to increase the amount of aluminum wire added to the converter steel tapping;

[0017] 4) According to the final sulfur content, the converter shall formulate the argon blowing time and flow rate of the converter tapping process and the argon station process molten steel tank;

[0018] End point sulfur>0.010%, argon blowing flow rate during steel tapping: 80±0.5m 3 / min;

[0019] Argon blowing time during steel tapping ≥ 120 + 0.5 × (end point sulfur - 0.01%) × 1000000, unit: s;

[0020] End point sulfur ≤ 0.0100%, argon blowing time during tapping is 120-130s;

[0021] End point sulfur>0.010%, argon blowing flow after tapping: 80±0.5m 3 / min;

[0022] Argon blowing time after steel tapping ≥ 0.8 × (end point sulfur - 0.01%) × 1000000, unit: s;

[0023] The sulfur content of the converter is ≤0.0100%, and argon is not blown after tapping;

[0024] End point sulfur>0.010%, argon blowing flow rate at argon station: 100±0.5m 3 / min;

[0025] Argon blowing time of argon station ≥ 150 + 0.5 × (end point sulfur - 0.01%) × 1000000, unit: s;

[0026] The sulfur content of the converter is ≤0.0100%, and the argon blowing time after tapping is 150-160s;

[0027] 5) Based on the sulfur composition of the argon station sample, formulate the following measures:

[0028] If the sulfur content in the argon station is greater than 0.010%, the amount of active lime added to the cover tank shall be ≥ 1.5 × (sulfur content in the argon station - 0.0100%) × 10,000, unit: kg / t steel;

[0029] If the sulfur content of the argon station is ≤0.0100%, there is no need to add active lime to the cover tank;

[0030] Argon-based sulfur>0.010%, aluminum powder addition amount ≥0.3×(argon-based sulfur-0.0100%)×10000, unit: kg / t steel,

[0031] If sulfur in the argon station is ≤0.0100%, there is no need to add aluminum powder;

[0032] Sulfur in argon station>0.010%, argon blowing flow rate in secondary argon station: 100±0.5m 3 / min; Secondary argon station argon blowing time ≥ 3×(argon station sulfur - 0.01%)×1000000, unit: s;

[0033] If the sulfur content of the argon station is ≤0.0100%, there is no need for secondary argon station argon blowing.

[0034] Specific operation of adding molten iron into converter in step 1):

[0035] Molten iron S≤0.015%, directly added to the converter;

[0036] Molten iron 0.015%≤S<0.020%, remove 1 / 4 of the slag and then add it to the converter;

[0037] Molten iron 0.020%≤S<0.025%, remove 1 / 3 of the molten iron slag and then add it to the converter;

[0038] When the molten iron is 0.025%≤S<0.035%, remove 1 / 2 of the slag and add it to the converter;

[0039] Molten iron with S content of 0.035%≤S must be pre-treated and desulfurized to meet the furnace entry standards. The molten iron slag must be scraped off before it is added to the converter.

[0040] Compared with the existing technology, the beneficial effects of the present invention are:

[0041] This invention reduces the pretreatment ratio for SPA-H container steel and utilizes a converter and argon station for rapid desulfurization, ensuring that the sulfur content of SPA-H container steel meets the required steel grade. This reduces the number of desulfurization steps, desulfurizer consumption, energy consumption, and squeegee losses. This new operating method for rapid desulfurization of SPA-H steel in a converter reduces desulfurization process costs and time, and improves converter production efficiency. DETAILED DESCRIPTION

[0042] It should be noted that, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein in the specification of the application are for the purpose of describing specific embodiments only and are not intended to limit this application. Mentioning "embodiments" herein means that the specific features, structures or characteristics described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of the present invention.

[0043] A method for controlling the sulfur content of SPA-H weathering steel includes molten iron, converter smelting, and refining; the low-sulfur molten iron is not pretreated, and the sulfur content is controlled to ≤ 0.010% through converter smelting, converter tapping, and argon station treatment, specifically comprising:

[0044] 1) When the molten iron S is less than 0.035%, it is not pre-treated and is added directly to the converter or after slagging. When the molten iron S is greater than or equal to 0.035%, it is added to the converter after pre-treatment.

[0045] 2) Adding active lime to converter smelting:

[0046] If the sulfur content of the molten iron in the converter is greater than 0.010%, the amount of active lime added = 3 × (molten iron sulfur - 0.0100%) × 10,000, unit: kg / t steel;

[0047] If the sulfur content of molten iron entering the furnace is ≤0.0100%, there is no need to increase the amount of lime added;

[0048] 4) The tapping temperature of the converter shall not be lower than 1675°C, and the temperature after tapping shall not be lower than 1625°C;

[0049] The converter end point sulfur is greater than 0.010%, and the amount of lime added to the cover tank during the converter tapping process is ≥ 2.5 + 2 × (converter end point sulfur - 0.0100%) × 10000, kg / t steel;

[0050] If the sulfur content of the converter is ≤0.0100%, the amount of lime added to the cover tank is 2.5-3.0 kg / t steel;

[0051] If the converter end point S is greater than 0.010%, the amount of aluminum powder added after the converter tapping is ≥ 0.2 × (converter end point sulfur - 0.0100%) × 10000, kg / t steel, and the argon station sulfur is ≤ 0.0100%, then aluminum powder is not added after the converter tapping;

[0052] If the converter end point S is greater than 0.010%, the amount of aluminum wire added to the converter steel tapping should be ≥ 0.1 × (converter end point sulfur - 0.0100%) × 10,000, kg / t steel, and the argon station sulfur is ≤ 0.0100%, then there is no need to increase the amount of aluminum wire added to the converter steel tapping;

[0053] 4) According to the final sulfur content, the converter shall formulate the argon blowing time and flow rate of the converter tapping process and the argon station process molten steel tank;

[0054] End point sulfur>0.010%, argon blowing flow rate during steel tapping: 80±0.5m 3 / min;

[0055] Argon blowing time during steel tapping ≥ 120 + 0.5 × (end point sulfur - 0.01%) × 1000000, unit: s;

[0056] End point sulfur ≤ 0.0100%, argon blowing time during tapping is 120-130s;

[0057] End point sulfur>0.010%, argon blowing flow after tapping: 80±0.5m 3 / min;

[0058] Argon blowing time after steel tapping ≥ 0.8 × (end point sulfur - 0.01%) × 1000000, unit: s;

[0059] The sulfur content of the converter is ≤0.0100%, and argon is not blown after tapping;

[0060] End point sulfur>0.010%, argon blowing flow rate at argon station: 100±0.5m 3 / min;

[0061] Argon blowing time of argon station ≥ 150 + 0.5 × (end point sulfur - 0.01%) × 1000000, unit: s;

[0062] The sulfur content of the converter is ≤0.0100%, and the argon blowing time after tapping is 150-160s;

[0063] 5) Based on the sulfur composition of the argon station sample, formulate the following measures:

[0064] If the sulfur content in the argon station is greater than 0.010%, the amount of active lime added to the cover tank shall be ≥ 1.5 × (sulfur content in the argon station - 0.0100%) × 10,000, unit: kg / t steel;

[0065] If the sulfur content of the argon station is ≤0.0100%, there is no need to add active lime to the cover tank;

[0066] Argon-based sulfur>0.010%, aluminum powder addition amount ≥0.3×(argon-based sulfur-0.0100%)×10000, unit: kg / t steel,

[0067] If sulfur in the argon station is ≤0.0100%, there is no need to add aluminum powder;

[0068] Sulfur in argon station>0.010%, argon blowing flow rate in secondary argon station: 100±0.5m 3 / min; Secondary argon station argon blowing time ≥ 3×(argon station sulfur - 0.01%)×1000000, unit: s;

[0069] If the sulfur content of the argon station is ≤0.0100%, there is no need for secondary argon station argon blowing.

[0070] Specific operation of adding molten iron into converter in step 1):

[0071] Molten iron S≤0.015%, directly added to the converter;

[0072] Molten iron 0.015%≤S<0.020%, remove 1 / 4 of the slag and then add it to the converter;

[0073] Molten iron 0.020%≤S<0.025%, remove 1 / 3 of the molten iron slag and then add it to the converter;

[0074] When the molten iron is 0.025%≤S<0.035%, remove 1 / 2 of the slag and add it to the converter;

[0075] Molten iron with S content of 0.035%≤S must be pre-treated and desulfurized to meet the furnace entry standards. The molten iron slag must be scraped off before it is added to the converter.

[0076] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0077] Example 1:

[0078] The steel grade produced was SPA-H, ladle grade D, turnover time of 100 minutes, tapping volume of 270.5 tons, target converter tapping temperature of 1675°C, finished product requirement of S ≤ 0.010%, hot metal temperature of 1356°C, hot metal S content of 0.028%, and scrap of 46.2 tons.

[0079] The following steps are involved:

[0080] 1) Remove 1 / 2 of the slag from the molten iron, the amount of slag is 0.6t, and then add it into the converter;

[0081] 2) Converter smelting: add 8460kg of active lime, add 1460kg more, and the oxygen accumulation reaches 11106Nm 3 When the TSC test is performed with the auxiliary gun, the gun is lifted after blowing to the end point according to the TSC measurement data. The end point temperature is 1688°C, the oxygen value is 466ppm, and the rapid analyzer test results are C = 0.051%, P = 0.0263%, and S = 0.018%;

[0082] 3) The tapping temperature is 1688℃, and the temperature after tapping is 1632℃. Argon is blown to reduce sulfur during the tapping process and the argon station treatment process.

[0083] Steel tapping process: During the steel tapping alloying process, the amount of aluminum wire added is 422kg, an additional 22kg is added, and the amount of aluminum powder added is 43kg. The amount of white ash added to the cover tank is 1109kg, the normal amount is 675kg, and an additional 437kg is added. The argon blowing time during the steel tapping process is 160s, and the argon flow rate is 80m 3 / min, argon blowing time after steel tapping: 64s, argon flow rate 80m 3 / min, open to the argon station, argon blowing time at the argon station: 190s, argon flow rate 100m 3 / min;

[0084] 4) Sampling at the argon station showed S 0.012%, which did not meet the steel grade requirement (≤0.010%). Secondary treatment at the argon station was performed, with 81kg of active lime and 16kg of aluminum powder added. Secondary argon blowing time: 60s, argon flow rate: 100m 3 / min, after processing, the sample S0.009% meets the conditions and enters the next process, refining S0.006%, the composition is qualified, and it is put into casting machine. The casting machine composition is 0.006%, which meets the steel grade requirements.

[0085] Example 2:

[0086] The steel grade produced was SPA-H, ladle grade D, with a turnover time of 105 minutes, a tapping volume of 270.8 tons, a converter target tapping temperature of 1675°C, a finished product requirement of S ≤ 0.010%, a molten iron temperature of 1386°C, a molten iron S content of 0.022%, and 48.2 tons of scrap steel.

[0087] The following steps are involved:

[0088] 1) Remove 1 / 3 of the slag from the molten iron, the amount of slag is 0.4t, and then add it into the converter;

[0089] 2) Converter smelting: Add 7974kg of active lime, add 974kg more, and the oxygen accumulation reaches 10906Nm 3 When the TSC test is performed with the auxiliary gun, the gun is lifted after blowing to the end point according to the TSC measurement data. The end point temperature is 1678℃, the oxygen value is 412ppm, and the rapid analyzer test results are C=0.061%, P=0.0253%, and S=0.015%;

[0090] 3) The tapping temperature is 1678℃, and the temperature after tapping is 1628℃. Argon is blown to reduce sulfur during the tapping process and the argon station treatment process.

[0091] Steel tapping process: During the steel tapping alloying process, the amount of aluminum wire added is 379kg, 14kg more is added, 27kg of aluminum powder is added, the amount of white ash added to the cover tank is 946kg, the normal amount is 675kg, 271kg more is added, the argon blowing time during the steel tapping process is 145s, and the argon flow rate is 80m 3 / min, argon blowing time after steel tapping: 40s, argon flow rate 80m 3 / min, open to the argon station, argon blowing time at the argon station: 175s, argon flow rate 100m 3 / min;

[0092] 4) Sampling at the argon station showed S 0.011%, which did not meet the steel grade requirement (≤0.010%). Secondary treatment at the argon station was performed, with 40 kg of active lime and 9 kg of aluminum powder added. Secondary argon blowing time: 30 s, argon flow rate: 100 m 3 / min, after processing, the sample S0.008% meets the conditions and enters the next process, refining S 0.007%, the composition is qualified, and it is put into casting machine. The casting machine composition is 0.007%, which meets the steel grade requirements.

[0093] Example 3:

[0094] The steel grade produced was SPA-H, ladle grade D, with a turnover time of 99 minutes, a tapping volume of 270.5 tons, a converter target tapping temperature of 1675°C, a finished product sulfur content requirement of 0.010% or less, a molten iron temperature of 1355°C, a molten iron sulfur content of 0.018%, and 45.2 tons of scrap steel.

[0095] The following steps are involved:

[0096] 1) Remove 1 / 4 of the slag from the molten iron, the amount of slag is 0.3t, and then add it to the converter;

[0097] 2) Converter smelting: Add 7649kg of active lime, add 649kg more, and the oxygen accumulation reaches 11306Nm 3 When the TSC test is performed with the auxiliary gun, the gun is lifted after blowing to the end point according to the TSC measurement data. The end point temperature is 1682°C, the oxygen value is 482ppm, and the rapid analyzer test results are C = 0.049%, P = 0.0273%, and S = 0.009%;

[0098] 3) The tapping temperature is 1682°C, and the temperature after tapping is 1635°C. Argon gas is not blown to reduce sulfur during the tapping process and the argon station treatment process.

[0099] Steel tapping process: During the steel tapping alloying process, the amount of aluminum wire added was 396kg, the final sulfur content did not exceed the standard, no additional aluminum wire was added, the final sulfur content did not exceed the standard, no additional aluminum powder was added, the active lime in the cover tank was 675kg, the final sulfur content did not exceed the standard, no additional active lime was added, the argon blowing time during the steel tapping process was 120s, and the argon flow rate was 80m 3 / min, argon blowing time after steel tapping: 0s, open to argon station, argon blowing time at argon station: 150s, argon flow rate 100m 3 / min;

[0100] Sampling at the argon station, S0.007%, directly enters the next process, refining S0.007%, the composition is qualified, put into casting machine, the casting machine composition is 0.007%, meeting the steel grade requirements.

[0101] Example 4:

[0102] The steel grade produced was SPA-H, ladle grade D, with a turnover time of 101 minutes, a tapping volume of 270.6 tons, a converter target tapping temperature of 1675°C, a finished product requirement of S ≤ 0.010%, a molten iron temperature of 1377°C, a molten iron S content of 0.013%, and 46.5 tons of scrap steel.

[0103] The following steps are involved:

[0104] 1) The molten iron is not skimmed off before being added to the converter;

[0105] 2) Converter smelting: Add 7243kg of active lime, add 243kg more, and the oxygen accumulation reaches 11186Nm 3 When the TSC test is performed with the auxiliary gun, the gun is lifted after blowing to the end point according to the TSC measurement data. The end point temperature is 1685℃, the oxygen value is 442ppm, and the rapid analyzer test results are C=0.053%, P=0.0223%, and S=0.009%;

[0106] 3) The tapping temperature is 1685℃, and the temperature after tapping is 1633℃. Argon gas is not blown to reduce sulfur during the tapping process and the argon station treatment process.

[0107] Steel tapping process: During the steel tapping alloying process, the amount of aluminum wire added was 278kg, the final sulfur content did not exceed the standard, no additional aluminum wire was added, the final sulfur content did not exceed the standard, no additional aluminum powder was added, the active lime in the cover tank was 675kg, the final sulfur content did not exceed the standard, no additional active lime was added in the cover tank, the argon blowing time during the steel tapping process was 120s, and the argon flow rate was 80m 3 / min, argon blowing time after steel tapping: 0s, open to argon station, argon blowing time at argon station: 150s, argon flow rate 100m 3 / min; sampling at the argon station, S0.008%, directly enter the next process, refining S0.007, the composition is qualified, put on the casting machine, the casting machine composition is 0.008%, meeting the steel grade requirements.

[0108] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and basic spirit of the invention, and the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A method for controlling sulfur content in SPA-H weathering steel, comprising molten iron, converter smelting, and refining; characterized in that: Low-sulfur hot metal is not pretreated and the sulfur content is controlled to ≤0.010% through converter smelting, converter tapping and argon station treatment, including: 1) When the molten iron S is less than 0.035%, it is not pre-treated and is added directly to the converter or after slagging. When the molten iron S is greater than or equal to 0.035%, it is added to the converter after pre-treatment. 2) Adding active lime to converter smelting: If the sulfur content of the molten iron in the converter is greater than 0.010%, the amount of active lime added = 3 × (molten iron sulfur - 0.0100%) × 10,000, unit: kg / t steel; If the sulfur content of molten iron entering the furnace is ≤0.0100%, there is no need to increase the amount of lime added; 3) The tapping temperature of the converter shall not be lower than 1675°C, and the temperature after tapping shall not be lower than 1625°C; The converter end point S is greater than 0.010%, and the amount of lime added to the cover tank during the converter tapping process is ≥ 2.5 + 2 × (converter end point sulfur - 0.0100%) × 10000, kg / t steel; If the sulfur content of the converter is ≤0.0100%, the amount of lime added to the cover tank is 2.5-3.0 kg / t steel; If the converter end point S is greater than 0.010%, the amount of aluminum powder added after the converter tapping is ≥ 0.2 × (converter end point sulfur - 0.0100%) × 10000, kg / t steel, and the argon station sulfur is ≤ 0.0100%, then aluminum powder is not added after the converter tapping; If the converter end point S is greater than 0.010%, the amount of aluminum wire added to the converter steel tapping should be ≥ 0.1 × (converter end point sulfur - 0.0100%) × 10,000, kg / t steel, and the argon station sulfur is ≤ 0.0100%, then there is no need to increase the amount of aluminum wire added to the converter steel tapping; 4) According to the final sulfur content, the converter shall formulate the argon blowing time and flow rate of the converter tapping process and the argon station process molten steel tank; End point sulfur>0.010%, argon blowing flow rate during steel tapping: 80±0.5m 3 / min; Argon blowing time during steel tapping ≥ 120 + 0.5 × (end point sulfur - 0.01%) × 1000000, unit: s; End point sulfur ≤ 0.0100%, argon blowing time during tapping is 120-130s; End point sulfur>0.010%, argon blowing flow after steel tapping: 80±0.5m 3 / min; Argon blowing time after steel tapping ≥ 0.8 × (end point sulfur - 0.01%) × 1000000, unit: s; The sulfur content of the converter is ≤0.0100%, and argon is not blown after tapping; End point sulfur>0.010%, argon blowing flow rate at argon station: 100±0.5m 3 / min; Argon blowing time of argon station ≥ 150 + 0.5 × (end point sulfur - 0.01%) × 1000000, unit: s; The sulfur content of the converter is ≤0.0100%, and the argon blowing time after tapping is 150-160s; 5) Based on the sulfur composition of the argon station sample, formulate the following measures: If the sulfur content in the argon station is greater than 0.010%, the amount of active lime added to the cover tank shall be ≥ 1.5 × (sulfur content in the argon station - 0.0100%) × 10,000, unit: kg / t steel; If the sulfur content of the argon station is ≤0.0100%, there is no need to add active lime to the cover tank; Argon-based sulfur>0.010%, aluminum powder addition amount ≥0.3×(argon-based sulfur-0.0100%)×10000, unit: kg / t steel, If sulfur in the argon station is ≤0.0100%, there is no need to add aluminum powder; Sulfur in argon station>0.010%, argon blowing flow rate in secondary argon station: 100±0.5m 3 / min; Secondary argon station argon blowing time ≥ 3×(argon station sulfur - 0.01%)×1000000, unit: s; If the sulfur content of the argon station is ≤0.0100%, there is no need for secondary argon station argon blowing.

2. The method for controlling sulfur content in SPA-H weathering steel according to claim 1, characterized in that: Specific operation of adding molten iron into converter in step 1): Molten iron: S≤0.015%, directly added to the converter; Molten iron: 0.015%≤S<0.020%, remove 1 / 4 of the slag and add it to the converter; Molten iron: 0.020%≤S<0.025%, remove 1 / 3 of the slag before adding it into the converter; Molten iron: 0.025%≤S<0.035%, remove 1 / 2 of the slag and add it to the converter; Molten iron: 0.035% ≤ S. It must undergo pre-treatment and desulfurization to meet the furnace entry standards. The molten iron slag must be scraped off before it is added to the converter.