CN113564304A - Method for producing steel - Google Patents
Method for producing steel Download PDFInfo
- Publication number
- CN113564304A CN113564304A CN202110737050.8A CN202110737050A CN113564304A CN 113564304 A CN113564304 A CN 113564304A CN 202110737050 A CN202110737050 A CN 202110737050A CN 113564304 A CN113564304 A CN 113564304A
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- CN
- China
- Prior art keywords
- steel
- slag
- molten steel
- furnace
- lime
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 107
- 239000010959 steel Substances 0.000 title claims abstract description 107
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 239000002893 slag Substances 0.000 claims abstract description 44
- 238000007670 refining Methods 0.000 claims abstract description 34
- 239000000463 material Substances 0.000 claims abstract description 21
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 20
- 239000011593 sulfur Substances 0.000 claims abstract description 20
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 238000002844 melting Methods 0.000 claims abstract description 7
- 230000008018 melting Effects 0.000 claims abstract description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 20
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 19
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 19
- 239000004571 lime Substances 0.000 claims description 19
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 13
- 239000010436 fluorite Substances 0.000 claims description 13
- 229910052786 argon Inorganic materials 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- 238000007664 blowing Methods 0.000 claims description 7
- 238000010079 rubber tapping Methods 0.000 claims description 7
- 238000009749 continuous casting Methods 0.000 claims description 4
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 3
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- 238000005266 casting Methods 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 239000005997 Calcium carbide Substances 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009847 ladle furnace Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- 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
- C21C5/52—Manufacture of steel in electric furnaces
-
- 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
- C21C7/0006—Adding metallic additives
-
- 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
- C21C7/06—Deoxidising, e.g. killing
-
- 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
- C21C7/064—Dephosphorising; Desulfurising
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The embodiment of the invention provides a steel production method, which comprises the following steps: providing a steel material, and heating and melting the steel material into molten steel through an electric furnace; adding molten steel into a refining furnace for refining, and adding a first slag charge and a deoxidizer; taking a first steel sample out of the refining furnace and adding a second slag charge into the refining furnace; taking a second steel sample out of the refining furnace and adding a third slag charge into the refining furnace; and continuously casting and forming the refined molten steel. The steel prepared by the steel production method has lower sulfur content.
Description
Technical Field
The application relates to the field of metallurgy, in particular to a steel production method.
Background
Some workpieces require steel with very low sulfur content, for example, in the process of producing wire steel, the wire steel of H08C type has high requirement on the sulfur content of the finished product, and part of the welding rod used for welding petroleum pipelines requires that S% is less than or equal to 0.0040%. An increase in the sulfur content of the steel increases the propensity of the weld to crack, and also increases the likelihood of porosity in the weld. Some existing ultra-low sulfur steels need complex production processes, so that the production cost is high and the production efficiency is low.
Disclosure of Invention
The embodiment of the application provides a steel production method, which at least solves the problem that the production process of low-sulfur steel in the related technology is complex.
A method of producing steel according to the present application, comprising the steps of:
providing a steel material, and heating and melting the steel material into molten steel through an electric furnace;
adding molten steel into a refining furnace for refining, and adding a first slag charge and a deoxidizer;
taking a first steel sample out of the refining furnace and adding a second slag charge into the refining furnace;
taking a second steel sample out of the refining furnace and adding a third slag charge into the refining furnace; and
and carrying out continuous casting molding on the refined molten steel.
Further, after the step of taking out a second steel sample from the refining furnace and adding a third slag charge to the refining furnace, the method also comprises the following steps:
and detecting the sulfur content of the first steel sample and determining whether slag needs to be supplemented or not according to the sulfur content.
Further, when the sulfur content of the first steel sample is more than 0.012 percent, adding a fourth slag charge into the refining furnace.
Further, the fourth slag comprises 200kg of lime and 60kg of fluorite.
Further, the first slag comprises 600kg of lime and 200kg of fluorite, the second slag comprises 300kg of lime and 120kg of fluorite, the third slag comprises 250kg of lime and 100kg of fluorite, and the molten steel is not less than 60 tons.
Further, when the molten steel is added into the refining furnace, argon blowing at the bottom of the steel ladle is conducted, and the diameter of a molten steel bright ring is controlled to be 300-400mm before a second steel sample is taken; and controlling the diameter of the molten steel bright ring to be 200-300mm after the second steel sample is taken.
Further, in the step of providing a steel material and heating and melting the steel material into molten steel through an electric furnace, the tapping temperature of the electric furnace is greater than or equal to 1610 ℃; the steel tapping and feeding sequence comprises ferrosilicon, low-carbon ferromanganese and lime, wherein the adding amount of the lime is 500 kg/furnace.
Further, in the step of providing steel raw materials and heating and melting the steel raw materials into molten steel through an electric furnace, the bottom of a steel ladle is started to blow argon, and the diameter of a molten steel bright ring is controlled to be 400mm in 300-; after the materials are added and completely melted, the diameter of the molten steel bright ring is controlled to be 200-300 mm.
Has the advantages that: compared with the prior art, the method adopts the methods of adding slag by stages and desulfurizing by stages in refining, and the first slag, the second slag and the third slag are respectively added, so that the sulfur content of the steel can be reduced by a simple method. The highest sulfur content of the steel is reduced from that of molten iron S percent to that of finished product S percent to 0.0017.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a flow chart of a steel production process of an embodiment of the present invention.
Detailed Description
The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
Referring to fig. 1, an embodiment of the present application provides a method for producing steel, including the following steps:
s1, providing a steel material, and heating and melting the steel material into molten steel through an electric furnace;
s2, adding the molten steel into a refining furnace for refining, and adding a first slag charge and a deoxidizer;
s3, taking a first steel sample out of the refining furnace and adding a second slag charge into the refining furnace;
s4, taking a second steel sample out of the refining furnace and adding a third slag charge into the refining furnace; and
and S5, carrying out continuous casting molding on the refined molten steel.
In one embodiment, after S4 and before S5, the method further comprises the steps of detecting the sulfur content of the first steel sample and determining whether to supplement slag according to the sulfur content. Specifically, when the sulfur content of the first steel sample is more than 0.012 percent, adding a fourth slag charge into the refining furnace. The fourth slag comprises 200kg of lime and 60kg of fluorite
In S1, the material use requirement: the molten iron is not less than 60 tons per furnace; the electric furnace smelting does not add metallized pellets, sludge pellets and other steel material substitutes with high sulfur content.
Tapping temperature of the electric furnace: t is more than or equal to 1610 ℃.
Tapping and feeding sequence: ferrosilicon, low-carbon ferromanganese and lime, wherein the addition amount of the lime is 500 kg/furnace.
Bottom blowing control of a tapping ladle: opening the ladle bottom to blow argon in advance, and controlling the diameter of the molten steel bright ring at 300-400mm before the second batch of materials is added; after the materials are added and completely melted, the diameter of the molten steel bright ring is controlled to be 200-300 mm.
In one embodiment, the pressure of the bottom argon is controlled to be 0.3-0.5MPa before the second batch is added; after the materials are added and completely melted, the flow of bottom-blown argon is properly reduced, and the bottom-blown argon is closed when the ladle is lifted away from the ladle.
In S2 to S4, ladle bottom blowing control: when the molten steel reaches a refining FURNACE ((LADLE FURNACE)), the argon blowing at the bottom of the steel LADLE is quickly connected, the flow rate of the bottom blowing of the steel LADLE is 200-; after the second steel sample is taken, the bottom blowing flow of the steel ladle is 200-; during the soft stirring period: the slag surface slightly fluctuates and the molten steel is not exposed; the soft stirring time is not less than 15 minutes.
Refining and slagging: electrifying when the molten steel reaches a refining furnace, adding a first slag charge, and performing diffusion deoxidation by using calcium carbide; after the first steel sample is completely taken, quickly adding a second slag material, electrifying to melt slag, and adding carbide to deoxidize; and adding a third slag after the second steel sample is completely taken. The first slag comprises 600kg of lime and 200kg of fluorite, the second slag comprises 300kg of lime and 120kg of fluorite, and the third slag comprises 250kg of lime and 100kg of fluorite.
And determining whether slag needs to be supplemented or not according to the sulfur content of the first steel sample, and supplementing a fourth slag if the sulfur content is more than 0.012%. The fourth slag comprises 200kg of lime and 60kg of fluorite.
In step S5, the continuous casting is performed with a ladle, a long nozzle, an argon seal, an integral nozzle, and a high-alkalinity tundish covering agent.
After step S5, the method further includes casting blank inspection: and checking whether the surface of the blank has cracks or not and whether shrinkage cavities occur or not.
The foregoing is only a preferred embodiment of the present application and it should be noted that those skilled in the art can make several improvements and modifications without departing from the principle of the present application, and these improvements and modifications should also be considered as the protection scope of the present application.
Claims (8)
1. A method of producing steel, comprising the steps of:
providing a steel material, and heating and melting the steel material into molten steel through an electric furnace;
adding molten steel into a refining furnace for refining, and adding a first slag charge and a deoxidizer;
taking a first steel sample out of the refining furnace and adding a second slag charge into the refining furnace;
taking a second steel sample out of the refining furnace and adding a third slag charge into the refining furnace; and
and carrying out continuous casting molding on the refined molten steel.
2. The steel production method of claim 1, further comprising, after the step of removing a second steel sample from the finer and adding a third slag to the finer, the step of:
and detecting the sulfur content of the first steel sample and determining whether slag needs to be supplemented or not according to the sulfur content.
3. The steel production method of claim 2, wherein a fourth slag is added to the finer when the first steel sample sulfur content is greater than 0.012%.
4. The steel production method of claim 3, wherein the fourth slag comprises 200kg of lime and 60kg of fluorite.
5. The method of producing steel as claimed in claim 1 wherein the first slag includes 600kg of lime and 200kg of fluorite, the second slag includes 300kg of lime and 120kg of fluorite, the third slag includes 250kg of lime and 100kg of fluorite, and the molten steel is not less than 60 tons.
6. The method for producing steel as claimed in claim 1, wherein argon is blown into the bottom of the ladle when the molten steel is added into the refining furnace, and the diameter of the molten steel bright ring is controlled to 300-400mm before the second steel sample is taken; and controlling the diameter of the molten steel bright ring to be 200-300mm after the second steel sample is taken.
7. The steel production method according to claim 1, wherein in the step of supplying the steel material, which is heated and melted by the electric furnace into molten steel, the tapping temperature of the electric furnace is greater than or equal to 1610 ℃; the steel tapping and feeding sequence comprises ferrosilicon, low-carbon ferromanganese and lime, wherein the adding amount of the lime is 500 kg/furnace.
8. The steel production method as claimed in claim 7, wherein in the step of providing the steel material, heating and melting the steel material into molten steel by an electric furnace, argon blowing is started at the bottom of the steel ladle, and the diameter of the molten steel bright ring is controlled to be 400mm at 300-; after the materials are added and completely melted, the diameter of the molten steel bright ring is controlled to be 200-300 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110737050.8A CN113564304A (en) | 2021-06-30 | 2021-06-30 | Method for producing steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110737050.8A CN113564304A (en) | 2021-06-30 | 2021-06-30 | Method for producing steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113564304A true CN113564304A (en) | 2021-10-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110737050.8A Pending CN113564304A (en) | 2021-06-30 | 2021-06-30 | Method for producing steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113564304A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103898269A (en) * | 2014-04-02 | 2014-07-02 | 南京钢铁股份有限公司 | Ultralow sulfur steel quick smelting method |
| CN104278130A (en) * | 2014-09-23 | 2015-01-14 | 商洛学院 | Process of quickly regulating alkalinity of LF (ladle furnace) slag |
| CN104630418A (en) * | 2015-01-15 | 2015-05-20 | 南京钢铁股份有限公司 | High-cleanliness pipeline steel smelting process |
| CN105063474A (en) * | 2015-08-26 | 2015-11-18 | 江苏省沙钢钢铁研究院有限公司 | Electric furnace smelting method of steel for welding wire |
-
2021
- 2021-06-30 CN CN202110737050.8A patent/CN113564304A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103898269A (en) * | 2014-04-02 | 2014-07-02 | 南京钢铁股份有限公司 | Ultralow sulfur steel quick smelting method |
| CN104278130A (en) * | 2014-09-23 | 2015-01-14 | 商洛学院 | Process of quickly regulating alkalinity of LF (ladle furnace) slag |
| CN104630418A (en) * | 2015-01-15 | 2015-05-20 | 南京钢铁股份有限公司 | High-cleanliness pipeline steel smelting process |
| CN105063474A (en) * | 2015-08-26 | 2015-11-18 | 江苏省沙钢钢铁研究院有限公司 | Electric furnace smelting method of steel for welding wire |
Non-Patent Citations (1)
| Title |
|---|
| 郑淑胜等: "济钢120tLF精炼炉的工艺优化", 《山东冶金》 * |
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Application publication date: 20211029 |