CN112961958A - Production method of sulfur-containing ultrahigh-oxygen ultralow-carbon steel - Google Patents
Production method of sulfur-containing ultrahigh-oxygen ultralow-carbon steel Download PDFInfo
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- 239000001301 oxygen Substances 0.000 title claims abstract description 67
- 229910052717 sulfur Inorganic materials 0.000 title claims abstract description 43
- 239000011593 sulfur Substances 0.000 title claims abstract description 39
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- 229910000975 Carbon steel Inorganic materials 0.000 title abstract description 8
- 239000010962 carbon steel Substances 0.000 title abstract description 8
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- 239000010959 steel Substances 0.000 claims abstract description 106
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 53
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- 229910001209 Low-carbon steel Inorganic materials 0.000 claims abstract description 28
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000010079 rubber tapping Methods 0.000 claims abstract description 22
- 238000007664 blowing Methods 0.000 claims abstract description 20
- 238000009749 continuous casting Methods 0.000 claims abstract description 18
- 238000003723 Smelting Methods 0.000 claims abstract description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000005266 casting Methods 0.000 claims abstract description 12
- 238000007670 refining Methods 0.000 claims abstract description 10
- 238000005275 alloying Methods 0.000 claims abstract description 8
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- 239000000126 substance Substances 0.000 claims abstract description 6
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- 238000000034 method Methods 0.000 claims description 18
- 239000002893 slag Substances 0.000 claims description 14
- 239000010949 copper Substances 0.000 claims description 11
- 239000011572 manganese Substances 0.000 claims description 11
- 229910000604 Ferrochrome Inorganic materials 0.000 claims description 10
- 229910000914 Mn alloy Inorganic materials 0.000 claims description 10
- 230000004048 modification Effects 0.000 claims description 10
- 238000012986 modification Methods 0.000 claims description 10
- 229910000599 Cr alloy Inorganic materials 0.000 claims description 9
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 9
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 9
- 229910000796 S alloy Inorganic materials 0.000 claims description 9
- 239000000788 chromium alloy Substances 0.000 claims description 9
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 9
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 8
- 239000011651 chromium Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 239000003607 modifier Substances 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 5
- 239000010436 fluorite Substances 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 4
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 4
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 238000005261 decarburization Methods 0.000 claims description 4
- 239000004571 lime Substances 0.000 claims description 4
- 229910052748 manganese Inorganic materials 0.000 claims description 4
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims description 3
- 229910000640 Fe alloy Inorganic materials 0.000 claims description 2
- MBMLMWLHJBBADN-UHFFFAOYSA-N Ferrous sulfide Chemical compound [Fe]=S MBMLMWLHJBBADN-UHFFFAOYSA-N 0.000 claims description 2
- IYRDVAUFQZOLSB-UHFFFAOYSA-N copper iron Chemical compound [Fe].[Cu] IYRDVAUFQZOLSB-UHFFFAOYSA-N 0.000 claims description 2
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- 239000001257 hydrogen Substances 0.000 description 2
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
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- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/56—Manufacture of steel by other methods
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/068—Decarburising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/076—Use of slags or fluxes as treating agents
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The embodiment of the invention discloses a production method of sulfur-containing ultrahigh-oxygen ultralow-carbon steel, which comprises the steps of smelting molten iron to obtain low-carbon molten steel; the smelting end point temperature is controlled to be 1680-1700 ℃, and the chemical components of the low-carbon molten steel comprise the following components in percentage by mass: c: 0.03-0.09%, O: 300-700 ppm, and S is less than or equal to 0.03%; tapping the low-carbon molten steel, refining and decarbonizing to obtain decarbonized molten steel with carbon content less than or equal to 30ppm and oxygen content of 210-500 ppm, adding alloy into the decarbonized molten steel for alloying, and breaking the blank to obtain refined molten steel; and carrying out continuous casting after soft blowing and calming the refined molten steel to obtain a casting blank containing the sulfur, the ultra-high oxygen and the ultra-low carbon steel. According to the embodiment of the invention, only a small amount of alloy elements are needed to be added under the condition of 210-500 ppm of ultra-high oxygen, and the sulfur-containing ultra-high oxygen ultra-low carbon steel with good inner surface quality, only small precipitates, low cost and good continuous casting property can be obtained.
Description
Technical Field
The embodiment of the invention relates to the technical field of ultra-low carbon steel making, in particular to a production method of sulfur-containing ultra-high oxygen ultra-low carbon steel.
Background
The carbon content in the ultra-low carbon steel can be reduced to below 0.01 percent in the vacuum treatment process, even reduced to 10-30ppm, and the method is widely applied to the industries of automobiles, household appliances and the like. The high-oxygen ultra-low carbon steel product has good scaling resistance, pinhole resistance, adherence and easy cutting performance, and the customer demand is increasing.
However, the metallurgical process of the high oxygen steel has the problems that the control of the element components such as Mn, Cr and the like is unstable, the defect of bubbles and pinholes in the enamel process is caused by high content of C, the castability is poor due to serious corrosion resistance, the quality defect of rolled plates and the defect of slab pores cause off-line cleaning of slabs and increase of cost. At present, high-oxygen steel is mostly controlled by low oxygen to reduce corrosion, however, precipitates of the product are thick, the hydrogen storage performance of the high-oxygen steel is seriously influenced, and the defects are serious in the hot rolling and cold rolling processes, so that the surface quality of the product is influenced.
Therefore, how to develop a production method of sulfur-containing ultra-high oxygen and ultra-low carbon steel with good surface quality becomes a technical problem to be solved urgently.
Disclosure of Invention
The embodiment of the invention aims to provide a method for producing sulfur-containing ultrahigh-oxygen and ultralow-carbon steel, so that the sulfur-containing ultrahigh-oxygen and ultralow-carbon steel with good surface quality is obtained, LF (ladle furnace) heating operation is not used, and the production cost is low.
In order to achieve the above object, an embodiment of the present invention provides a method for producing a sulfur-containing ultra-high oxygen ultra-low carbon steel, including:
smelting molten iron to obtain low-carbon molten steel; the smelting end point temperature is controlled to be 1680-1700 ℃, and the chemical components of the low-carbon molten steel comprise the following components in percentage by mass: c: 0.03-0.09%, O: 300-700 ppm, and S is less than or equal to 0.03%;
tapping the low-carbon molten steel to obtain tapped molten steel;
refining and decarbonizing the molten steel to obtain decarbonized molten steel with carbon content less than or equal to 30ppm and oxygen content of 210-500 ppm; adding alloy into the decarbonized molten steel for alloying, and obtaining refined molten steel after breaking empty;
and carrying out continuous casting after soft blowing and calming the refined molten steel to obtain a casting blank containing the sulfur, the ultra-high oxygen and the ultra-low carbon steel.
Further, in the refining molten steel soft blowing, the flow rate of the soft blown oxygen is 0-300L/min, and the soft blowing time is 5-20 min.
Further, the sedation time is 10-40 min.
Further, in the refining and decarbonizing processes, the vacuum degree is kept to be less than or equal to 200Pa, and the time is kept to be more than or equal to 10 min.
Further, adding alloy, lime and fluorite auxiliary materials in the tapping, and tapping by adopting non-calm slag stopping; and after tapping, adding 100-700 kg of modifier to the slag surface of the tapped molten steel for slag modification.
And further, breaking the space after alloying for 3-8 min, wherein the temperature of the space is controlled to be 1580-1600 ℃.
Further, the alloy specifically comprises one of manganese alloy, sulfur alloy, chromium alloy and copper alloy, and the addition amount of the alloy is as follows: (target value of X element-content of X element before adding the alloy) X molten steel amount/(yield of the alloy X content of X element in the alloy), wherein X is one of alloy elements Mn, S, Cr and Cu.
Further, the manganese alloy specifically comprises at least one of medium carbon ferromanganese, low carbon ferromanganese, micro carbon ferromanganese and metal manganese, the sulfur alloy body comprises at least one of ferrosulfur and sulfur wire, the chromium alloy specifically comprises at least one of medium carbon ferrochrome, low carbon ferrochrome and micro carbon ferrochrome, and the copper alloy specifically comprises at least one of metal copper and copper ferroalloy.
Further, in the smelting treatment, the flow of bottom blowing argon is less than or equal to 800NM3/h。
Further, the continuous casting process is controlled by low argon, wherein the argon of the stopper rod is 0-3L/min, the argon of the water feeding port is 0-3L/min, and the argon of the plates is 0-6L/min
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
according to the production method of the sulfur-containing ultrahigh-oxygen and ultralow-carbon steel provided by the embodiment of the invention, molten iron is smelted to obtain low-carbon molten steel; the smelting end point temperature is controlled to be 1680-1700 ℃, and the chemical components of the low-carbon molten steel comprise the following components in percentage by mass: c: 0.03-0.09%, O: 300-700 ppm, and S is less than or equal to 0.03%; tapping the low-carbon molten steel to obtain tapped molten steel; refining and decarbonizing the molten steel to obtain decarbonized molten steel with carbon content less than or equal to 30 ppm; controlling free oxygen at 210-500 ppm, and breaking the air after alloying to obtain refined molten steel; and carrying out continuous casting after soft blowing and calming the refined molten steel to obtain a casting blank containing the sulfur, the ultra-high oxygen and the ultra-low carbon steel. According to the scheme, only a small amount of alloy elements are needed to be added under the ultrahigh oxygen condition (210-500 ppm), the sulfur-containing ultrahigh oxygen ultra-low carbon steel with good inner surface quality (only small precipitates) and low cost and good continuous casting property can be obtained, and even if LF (ladle furnace) heating operation is not used, the low-nitrogen high-sulfur ultrahigh oxygen molten steel can be produced at low cost.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of a method for producing a sulfur-containing ultra-high oxygen ultra-low carbon steel according to an embodiment of the invention.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the embodiments of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that the present embodiments and examples are illustrative of the present invention and are not to be construed as limiting the present invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which embodiments of the invention belong. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the examples of the present invention are commercially available or can be prepared by an existing method.
In order to solve the technical problems, the embodiment of the invention provides the following general ideas:
according to an exemplary embodiment of the present invention, there is provided a method for producing a sulfur-containing ultra-high oxygen ultra-low carbon steel, as shown in fig. 1, including:
s1, smelting the molten iron to obtain low-carbon molten steel; the smelting end point temperature is controlled to be 1680-1700 ℃, and the chemical components of the low-carbon molten steel comprise the following components in percentage by mass: c: 0.03-0.09%, O: 300-700 ppm, and S is less than or equal to 0.03%;
in this embodiment, the reason why the smelting end point temperature is controlled to 1680 ℃ to 1700 ℃ is: is favorable for the stable control of the temperature of the subsequent refined molten steel. If the temperature is too low, RH oxygen blowing and temperature rising deteriorate the purity of the molten steel; if the temperature is too high, the corrosion of refractory materials of the smelting furnace is increased;
controlling the chemical components of the low-carbon molten steel in mass fraction: c: 0.03-0.09%, O: the reason why the amount of the catalyst is 300-700 ppm is as follows: avoiding the difficulties of molten steel peroxidation and RH decarburization, being beneficial to RH rapid treatment of the molten steel and obtaining qualified refined molten steel.
As an optional implementation mode, in the smelting treatment in the step S1, the flow rate of bottom blowing argon is less than or equal to 800NM3H is used as the reference value. The argon in the flow is beneficial to stirring the molten steel in the molten pool, and good dynamic conditions are provided; too high argon flow is not favorable for low nitrogen control of molten steel.
As an alternative embodiment, in the tapping of the step S2, alloy, lime and fluorite auxiliary materials are added, and non-calm slag-stopping tapping is adopted; and after tapping, adding 100-700 kg of modifier to the slag surface of the tapped molten steel for slag modification.
S2, tapping the low-carbon molten steel to obtain molten steel;
adding alloy, lime and fluorite auxiliary materials into the steel, and tapping by adopting non-calm slag stopping; and after tapping, adding 100-700 kg of modifier to the slag surface of the tapped molten steel for slag modification.
S3, refining and decarbonizing the molten steel to obtain decarbonized molten steel with carbon content less than or equal to 30ppm and oxygen content of 210-500 ppm, adding alloy into the decarbonized molten steel to alloy, and breaking empty to obtain refined molten steel;
the reason for controlling the carbon content in the decarburization molten steel to be less than or equal to 30ppm is as follows: the carbon content is high, and the performance such as the most fish scaling resistance and pinhole resistance of the final product is influenced.
The reason for controlling the free oxygen to be 210-500 ppm is as follows: the continuous casting can be smoothly poured, and the product has good performance; the free oxygen is too low, and precipitates in steel are few, so that the hydrogen storage performance of a product is influenced; too high free oxygen affects smooth pouring of subsequent continuous casting processes.
As an optional implementation mode, in the refining decarburization, the vacuum degree is kept to be less than or equal to 200Pa, and the time is kept to be more than or equal to 10 min. Under the condition, the carbon content in the molten steel is reduced to an extremely low level.
As an optional implementation mode, the alloying is carried out for 3-8 min, then the gap is broken, and the temperature of the RH broken gap is controlled to be 1580-1600 ℃. If the air breaking temperature is too low, the casting machine has the hidden danger of frozen flow and casting break; if the cavity-breaking temperature is too high, the continuous casting blank shell is too thin, and the risk of steel leakage exists.
As an alternative embodiment, the alloy specifically includes one of a manganese alloy, a sulfur alloy, a chromium alloy, and a copper alloy, and the addition amount of the alloy is (target value of X element — content of X element before the alloy is added) X molten steel amount/(yield of the alloy X content of X element in the alloy), where X element is one of alloying elements Mn, S, Cr, and Cu. Generally, the amount of the manganese alloy added may be ± 400kg from the theoretical value calculated by the formula, that is, the deviation between the amount of the manganese alloy added and the theoretical value calculated by the formula within ± 400 kg; the addition amount of the sulfur alloy, the chromium alloy and the copper alloy is +/-40 kg of a theoretical value calculated by the formula, namely the addition amount of the sulfur alloy, the chromium alloy and the copper alloy can be within +/-40 kg of the theoretical value calculated by the formula.
If the alloy amount is larger than the theoretical value calculated by the formula, the production cost is high, the temperature drop in the process is large, and the MnS precipitation in the product is excessive; if the value is less than the theoretical value calculated by the formula, the product strength is low, precipitates are few, and adverse effects such as product performance requirements cannot be achieved;
specifically, the manganese alloy specifically comprises at least one of medium-carbon ferromanganese, low-carbon ferromanganese, micro-carbon ferromanganese and metal manganese, and the addition amount of the manganese alloy is (target value of Mn element-content of Mn element before adding the alloy) multiplied by molten steel amount/(yield of the alloy multiplied by content of Mn element in the alloy).
Specifically, the sulfur alloy body comprises at least one of sulfur iron and sulfur wire, and the addition amount of the sulfur alloy is (target value of S element-S element content before the alloy is added) multiplied by molten steel amount/(yield of the alloy multiplied by S element content in the alloy).
Specifically, the chromium alloy specifically comprises at least one of medium-carbon ferrochrome, low-carbon ferrochrome and micro-carbon ferrochrome, and the addition amount of the chromium alloy is (target value of Cr element-Cr element content before the alloy is added) multiplied by molten steel amount/(yield of the alloy multiplied by Cr element content in the alloy).
Specifically, the copper alloy specifically includes at least one of metallic copper and a copper-iron alloy, and the copper alloy addition amount is (target value of Cu element — Cu element content before the alloy is added) × molten steel amount/(yield of the alloy × Cu element content in the alloy).
And S4, carrying out soft blowing on the refined molten steel, calming and then carrying out continuous casting to obtain a casting blank of the sulfur-containing ultra-high oxygen ultra-low carbon steel.
As an optional implementation mode, the soft blowing flow rate is 0-300L/min. If the soft blowing flow is small, large-particle inclusions in the molten steel cannot float up sufficiently; if the soft blowing flow is large, the molten steel has the hidden trouble of exposure and is not beneficial to the upward floating and removal of impurities.
As an optional implementation mode, the soft blowing time is 5-20 min. The soft blowing time is short, and large-particle inclusions in molten steel cannot float up sufficiently; if the soft blowing time is long, the extension of the soft blowing time is not conducive to the removal of large-particle inclusions, and the temperature drop of the molten steel is also large.
As an alternative embodiment, the sedation time is 10-40 min. The sedation time is controlled for 10-40 min, which is beneficial to improving the purity of the molten steel; the sedation time is short, so that large inclusions in the molten steel are not completely removed; long sedation time and long reaction time of the molten steel and the refractory material of the steel ladle, which affects the purity of the molten steel.
As an optional implementation mode, low argon gas control is adopted in continuous casting, wherein the argon gas of a stopper rod is 0-3L/min, the argon gas of a water feeding port is 0-3L/min, and the argon gas between plates is 0-6L/min. The argon flow range is favorable for forming a proper crystallizer flow field, liquid level fluctuation is reduced, large-particle inclusion removal is promoted, and the melting of the covering slag is promoted.
According to the production method of the sulfur-containing ultrahigh-oxygen and ultralow-carbon steel, provided by the embodiment of the invention, only a small amount of alloy elements are needed to be added under an ultrahigh-oxygen condition (210-500 ppm), the sulfur-containing ultrahigh-oxygen and ultralow-carbon steel with good inner surface quality (only small precipitates) and low cost and good continuous casting property can be obtained, and even if LF (ladle furnace) heating operation is not used, the low-nitrogen and high-sulfur ultrahigh-oxygen molten steel can be produced at low cost.
The method for producing a sulfur-containing ultra-high oxygen and ultra-low carbon steel of the present application will be described in detail with reference to examples, comparative examples and experimental data.
Step S1, performing smelting treatment on the molten iron to obtain low-carbon molten steel;
controlling the end point temperature of the converter to be 1680-1700 ℃, and controlling the end point C: 0.03-0.09%, the terminal oxygen is controlled to be 300-700 ppm, and the S content is controlled to be less than or equal to 0.03%.
The process parameters for each example and each comparative example are tabulated in table 1.
TABLE 1
| Examples | TSC temperature of converter end point | Converter end point TSO temperature | End point O content of converter | End point C content of converter | End point S content of converter |
| Example 1 | 1611℃ | 1680℃ | 566ppm | 0.045％ | 0.01％ |
| Example 2 | 1640℃ | 1691℃ | 365ppm | 0.061％ | 0.02％ |
| Example 3 | 1625℃ | 1683℃ | 383ppm | 0.048％ | 0.02％ |
| Comparative example 1 | 1611℃ | 1677℃ | 566ppm | 0.045％ | 0.01％ |
| Comparative example 2 | 1659℃ | 1717℃ | 598ppm | 0.042％ | 0.02％ |
| Comparative example 3 | 1611℃ | 1680℃ | 566ppm | 0.045％ | 0.01％ |
Step S2, tapping the low-carbon molten steel to obtain tapping molten steel; tapping non-sedated steel from a converter, adding 50-130 kg of copper plate, 90-170 kg of ferrochromium and other alloys and white ash, fluorite and other auxiliary materials in the steel tapping process, carrying out convection operation in the steel tapping process to ensure that all alloys and slag materials are completely melted, and adding 100-700 kg of modifier to carry out a slag modification mode after steel tapping; measuring the temperature and O, C, S content of the molten steel after the RH station, as shown in Table 2;
TABLE 2
| Examples | The arrival temperature, deg.C | Oxygen in ppm at the station | Carbon coming to the station% | Enter station S% |
| Example 1 | 1620℃ | 456ppm | 0.041％ | 0.01％ |
| Example 2 | 1626℃ | 318ppm | 0.055％ | 0.02％ |
| Example 3 | 1611℃ | 304ppm | 0.043％ | 0.02％ |
| Comparative example 1 | 1602℃ | 409ppm | 0.039％ | 0.01％ |
| Comparative example 2 | 1667℃ | 454ppm | 0.036％ | 0.02％ |
| Comparative example 3 | 1620℃ | 456ppm | 0.041％ | 0.01％ |
Step S3, refining and decarbonizing the molten steel to obtain decarbonized molten steel with carbon content less than or equal to 30ppm, adding alloy into the decarbonized molten steel to alloy, and breaking the blank to obtain refined molten steel;
wherein RH adopts a high vacuum mode to decarbonize, the vacuum degree at the early stage of vacuum treatment is controlled below 200Pa and kept for more than 10min, and the carbon content at the end of target RH is less than or equal to 30 ppm. The free oxygen content was measured within 2min before the RH break.
The RH vacuum breaking temperature is controlled within the range of 1580-1600 ℃, aluminum is not added in the RH treatment, oxygen blowing and temperature rising are not carried out, and scrap steel is added within 5min from the beginning of vacuum if needed.
The alloys added in examples 1 to 3 and comparative examples 1 to 2 were manganese alloys in the amount of (target Mn element-Mn element content before addition of the alloy) × molten steel amount/(yield of the alloy × Mn element content in the alloy). The difference between the amount of the alloy added in the comparative example 3 and the theoretical value calculated by the formula is large;
TABLE 3
And step S4, calming the refined molten steel for 10-40 min, and then pouring into a blank to obtain a casting blank of the sulfur-containing ultra-high oxygen ultra-low carbon steel.
In continuous casting, the refractory materials such as the ladle lining brick, the ladle upper nozzle, the ladle lower nozzle, the ladle long nozzle, the tundish lining, the submerged nozzle and the like adopt low-carbon anti-corrosion refractory materials. Controlling RH to finish recarburization of continuous casting by using a low-carbon refractory, a tundish covering agent, a ladle modifier and covering slag; the casting powder is made of high-oxygen steel casting powder, the meniscus of a crystallizer containing sulfur, ultra-high oxygen and ultra-low carbon steel is improved, the quality of a casting blank is improved, and the incidence rate of subcutaneous air holes of the casting blank is reduced.
The compositions of the cast slabs obtained in each example and each comparative example are shown in table 4.
TABLE 4
| Examples | C | Mn | S | N | TO | Surface quality |
| Example 1 | 0.0006 | 0.25 | 0.025 | 0.0017 | 0.0269 | With only small precipitates |
| Example 2 | 0.0018 | 0.29 | 0.028 | 0.0014 | 0.0369 | With only small precipitates |
| Example 3 | 0.0011 | 0.34 | 0.022 | 0.0019 | 0.0427 | With only small precipitates |
| Comparative example 1 | 0.0033 | 0.16 | 0.036 | 0.0024 | 0.0193 | Coarse and large precipitate |
| Comparative example 2 | 0.0019 | 0.39 | 0.007 | 0.0032 | 0.0551 | Large particle inclusions |
| Comparative example 3 | 0.0051 | 0.42 | 0.039 | 0.041 | 0.0201 | Coarse and large precipitate |
From the data in table 4, it can be seen that:
in the comparative example 1, the oxygen content of the liquid of the decarbonized steel is 150ppm, the oxygen content is less than the range of 210-500 ppm of the oxygen content in the embodiment of the invention, the molten steel needs to be deoxidized in an auxiliary way, a large number of large-particle deoxidation products exist in the molten steel, precipitates are thick, and the quality of the final product is influenced;
in the comparative example 2, the oxygen content of the liquid of the decarbonized steel is 600ppm, and the oxygen content is less than the range of 210-500 ppm of the oxygen content in the embodiment of the invention, the steel ladle and the continuous casting refractory are seriously corroded, and corroded large-particle inclusion enters the molten steel to influence the purity of the molten steel.
The amount of alloy added in comparative example 3 is out of the range of the examples of the present invention; the method has the defects of coarse precipitates and excessive MnS precipitates;
in examples 1 to 3, sulfur-containing ultra-high oxygen ultra-low carbon steel with good inner surface quality (only small precipitates) and low cost and good continuous casting property can be obtained by only adding a small amount of alloy elements under the ultra-high oxygen condition (210 to 500ppm), and low-nitrogen high-sulfur ultra-high oxygen molten steel can be produced at low cost even without using LF temperature raising operation.
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention without departing from the spirit or scope of the embodiments of the invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims of the embodiments of the present invention and their equivalents, the embodiments of the present invention are also intended to encompass such modifications and variations.
Claims (10)
1. A method for producing sulfur-containing ultra-high oxygen ultra-low carbon steel, which is characterized by comprising the following steps:
smelting molten iron to obtain low-carbon molten steel; the smelting end point temperature is controlled to be 1680-1700 ℃, and the chemical components of the low-carbon molten steel comprise the following components in percentage by mass: c: 0.03-0.09%, O: 300-700 ppm, and S is less than or equal to 0.03%;
tapping the low-carbon molten steel to obtain tapped molten steel;
refining and decarbonizing the molten steel to obtain decarbonized molten steel with carbon content less than or equal to 30ppm and oxygen content of 210-500 ppm; adding alloy into the decarbonized molten steel for alloying, and obtaining refined molten steel after breaking empty;
and carrying out soft blowing and calming on the refined molten steel, and then carrying out continuous casting to obtain a casting blank containing the sulfur, the ultra-high oxygen and the ultra-low carbon steel.
2. The method for producing ultra-high oxygen and ultra-low carbon steel containing sulfur as claimed in claim 1, wherein the flow rate of oxygen in the soft blowing of the refined molten steel is 0-300L/min, and the time of the soft blowing is 5-20 min.
3. The method for producing sulfur-containing ultra-high oxygen and ultra-low carbon steel according to claim 1, wherein the calming time is 10-40 min.
4. The method for producing ultra-high oxygen and ultra-low carbon steel containing sulfur as claimed in claim 1, wherein the degree of vacuum is maintained at 200Pa or less for 10min or more during the refining and decarburization.
5. The method for producing sulfur-containing ultra-high oxygen and ultra-low carbon steel as claimed in claim 1, wherein during tapping, alloy, lime and fluorite auxiliary materials are added, and non-calm slag-stopping tapping is adopted; and after tapping, adding 100-700 kg of modifier to the slag surface of the tapped molten steel for slag modification.
6. The method for producing the sulfur-containing ultra-high oxygen and ultra-low carbon steel as claimed in claim 1, wherein the alloying is carried out for 3-8 min, and then the blank is broken, and the temperature of the blank is controlled to 1580-1600 ℃.
7. The method of claim 1, wherein the alloy is selected from the group consisting of manganese alloy, sulfur alloy, chromium alloy and copper alloy, and the amount of the alloy is (target value of X element-content of X element before adding the alloy) X amount of molten steel/(yield of the alloy X content of X element in the alloy), wherein X element is selected from the group consisting of Mn, S, Cr and Cu.
8. The method for producing a sulfur-containing ultra-high oxygen ultra-low carbon steel according to claim 7, wherein the manganese alloy comprises at least one of medium carbon ferromanganese, low carbon ferromanganese, micro carbon ferromanganese and metal manganese, the sulfur alloy comprises at least one of sulfur iron and sulfur wire, the chromium alloy comprises at least one of medium carbon ferrochrome, low carbon ferrochrome and micro carbon ferrochrome, and the copper alloy comprises at least one of metal copper and copper-iron alloy.
9. The method for producing ultra-high oxygen and ultra-low carbon steel containing sulfur as claimed in claim 1, wherein the flow rate of bottom blown argon during said smelting is not more than 800NM3/h。
10. The method for producing the sulfur-containing ultra-high oxygen and ultra-low carbon steel according to claim 1, wherein low argon gas control is adopted in the continuous casting, wherein stopper argon gas is 0-3L/min, upper nozzle argon gas is 0-3L/min, and argon gas between plates is 0-6L/min.
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