CN115287412A - Method for controlling nonmetallic inclusions in steel through single tube vacuum - Google Patents
Method for controlling nonmetallic inclusions in steel through single tube vacuum Download PDFInfo
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- CN115287412A CN115287412A CN202210960635.0A CN202210960635A CN115287412A CN 115287412 A CN115287412 A CN 115287412A CN 202210960635 A CN202210960635 A CN 202210960635A CN 115287412 A CN115287412 A CN 115287412A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 85
- 239000010959 steel Substances 0.000 title claims abstract description 85
- 238000000034 method Methods 0.000 title claims abstract description 32
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000007789 gas Substances 0.000 claims abstract description 25
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000011575 calcium Substances 0.000 claims abstract description 22
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 22
- 238000007664 blowing Methods 0.000 claims abstract description 21
- 229910052786 argon Inorganic materials 0.000 claims abstract description 17
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 6
- 239000000956 alloy Substances 0.000 claims abstract description 6
- 230000001174 ascending effect Effects 0.000 claims description 14
- 230000000630 rising effect Effects 0.000 claims description 10
- OSMSIOKMMFKNIL-UHFFFAOYSA-N calcium;silicon Chemical compound [Ca]=[Si] OSMSIOKMMFKNIL-UHFFFAOYSA-N 0.000 claims description 8
- 229910000882 Ca alloy Inorganic materials 0.000 claims description 4
- 238000009749 continuous casting Methods 0.000 abstract description 14
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 229910052799 carbon Inorganic materials 0.000 abstract description 8
- 239000011593 sulfur Substances 0.000 abstract description 8
- 229910052717 sulfur Inorganic materials 0.000 abstract description 8
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 abstract description 5
- -1 hepta-aluminum-dodecacalcium Chemical compound 0.000 abstract description 4
- 238000004925 denaturation Methods 0.000 abstract description 3
- 230000036425 denaturation Effects 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 3
- 238000005266 casting Methods 0.000 description 14
- 239000007788 liquid Substances 0.000 description 5
- 229910000676 Si alloy Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- ULGYAEQHFNJYML-UHFFFAOYSA-N [AlH3].[Ca] Chemical compound [AlH3].[Ca] ULGYAEQHFNJYML-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 238000010924 continuous production Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000016615 flocculation Effects 0.000 description 2
- 238000005189 flocculation Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- LRDIEHDJWYRVPT-UHFFFAOYSA-N 4-amino-5-hydroxynaphthalene-1-sulfonic acid Chemical compound C1=CC(O)=C2C(N)=CC=C(S(O)(=O)=O)C2=C1 LRDIEHDJWYRVPT-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910008455 Si—Ca Inorganic materials 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
-
- 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
-
- 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
- C21C7/072—Treatment with gases
-
- 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)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to the technical field of steel manufacturing, in particular to a method for controlling nonmetallic inclusions in steel in a single tube vacuum mode, which comprises the following steps: changing vacuum net circulation and optimizing a molten steel flow field; adding vacuum calcium to treat alloy; wherein, the vacuum clean circulation is started every 3min, and the ladle argon low-blowing and the vacuum circulation gas are adjusted once. The technical scheme of the invention can solve the problem that the inclusion of molten steel produced by a single-tube vacuum furnace influences the production. The invention changes the flow field of the vacuum molten steel and the novel calcium treatment method, reduces the denaturation of the aluminum oxide inclusion and treats the calcium into the hepta-aluminum-dodecacalcium low-melting-point substance, and the ultra-low-carbon and ultra-low-sulfur molten steel can be continuously produced in a continuous casting machine by utilizing the novel method and the novel material. The inclusion of molten steel is controlled by a method of controlling the non-metallic inclusion in steel through single tube vacuum, and the continuous casting function of the produced molten steel can be realized by meeting the RH process.
Description
Technical Field
The invention relates to the technical field of steel manufacturing, in particular to a method for controlling nonmetallic inclusions in steel through a single tube in vacuum.
Background
With the rapid development of the steel industry, the requirements on the performance of steel become more and more strict, high strength, high low-temperature crack arrest toughness and good weldability are required, and H resistance is also required for steel in special areas 2 S acid corrosion ability. In order to improve the hydrogen induced cracking resistance and the sulfide stress corrosion cracking resistance of steel, the contents of carbon, phosphorus, sulfur, oxygen, nitrogen and hydrogen impurity elements in steel must be reduced as much as possible, the number, the form and the size of non-metallic inclusions are controlled, and the purity of molten steel is improved.
Because the steel grade has extremely strict requirements on the carbon and sulfur contents in molten steel, if the carbon and sulfur contents of the steel grade can be stably controlled, the yield of the acid-resistant pipeline is improved, and the waste of waste products and the use safety performance of steel products are judged to replace greater economic benefits.
At present, in the prior art, a single-tube vacuum furnace is adopted to produce ultra-low-carbon and ultra-low-sulfur molten steel, and impurities in the produced molten steel cannot be treated under the continuous production condition, so that the problem of flocculation flow in continuous casting production can be caused.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method for controlling non-metallic inclusions in steel by a single tube vacuum, which solves the problem of controlling inclusions in molten steel produced by a single tube vacuum furnace and realizes continuous casting.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for controlling nonmetallic inclusions in steel in a single tube vacuum mode is characterized by comprising the following steps: the method comprises the following steps:
changing vacuum net circulation and optimizing a molten steel flow field;
adding vacuum calcium to treat alloy;
wherein, the vacuum clean circulation is started every 3min, and the ladle argon low-blowing and the vacuum circulation gas are adjusted once.
Wherein, the clean circulation refers to the process of removing the inclusion in vacuum, and the specific steps are as follows:
clean circulation for 0-3min: molten steel rising side ladle low argon blowing set flow 15m 3 H, setting the flow rate of 30m on the ascending side of the vacuum circulating gas 3 /h；
Clean circulation for 3-6min: the flow rate of the ladle low-argon blowing at the ascending side of the molten steel is set to be 10m 3 H, setting the flow rate of 20m on the ascending side of the vacuum circulating gas 3 /h；
Clean circulation for 6-9min: the flow rate of the ladle low-argon blowing at the ascending side of the molten steel is set to be 10m 3 H, setting the flow rate of the vacuum circulating gas at the rising side to be 15m 3 /h。
Wherein, the vacuum net circulation is added into 200kg of silicon-calcium alloy per furnace at one time when the time is 3min, so as to realize the calcium treatment of the molten steel.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the method for controlling the non-metallic inclusions in the steel through the single tube vacuum is suitable for the single tube vacuum furnace, and can solve the problem that the inclusions in molten steel produced by the single tube vacuum furnace influence the production. The invention changes the flow field of the vacuum molten steel and the novel calcium treatment method, reduces the denaturation of the aluminum oxide inclusion and treats the calcium into the hepta-aluminum-dodecacalcium low-melting-point substance, and the ultra-low-carbon and ultra-low-sulfur molten steel can be continuously produced in a continuous casting machine by utilizing the novel method and the novel material. The inclusion of molten steel is controlled by a method of controlling the non-metallic inclusion in steel through single tube vacuum, and the continuous casting function of the produced molten steel can be realized by meeting the RH process.
Detailed Description
The following detailed description of the present invention is provided in connection with specific embodiments to further understand the objects, schemes and effects of the present invention, but not to limit the scope of the appended claims.
The embodiment of the invention provides a method for controlling nonmetallic inclusions in steel in a single tube in vacuum, which comprises the following steps: changing vacuum net circulation and optimizing a molten steel flow field; adding vacuum calcium to treat alloy; wherein, the vacuum clean circulation is started every 3min, and the ladle argon low-blowing and the vacuum circulation gas are adjusted once.
Specifically, the clean circulation refers to a process for removing inclusions in vacuum, and specifically comprises the following steps:
clean circulation for 0-3min: molten steel rising side ladle low argon blowing set flow rate of 15m 3 H, setting the flow rate of 30m on the ascending side of the vacuum circulating gas 3 /h；
Net circulation for 3-6min: the flow rate of the ladle low-argon blowing at the ascending side of the molten steel is set to be 10m 3 H, setting the flow rate of 20m on the ascending side of the vacuum circulating gas 3 /h；
Net circulation 6-9min: the flow rate of the ladle low-argon blowing at the ascending side of the molten steel is set to be 10m 3 H, setting the flow rate of the vacuum circulating gas at the rising side to be 15m 3 /h。
Specifically, the calcium-silicon alloy is added into the furnace at one time when the vacuum net circulation is 3min, and the calcium treatment of the molten steel is realized.
The method for controlling the non-metallic inclusions in the steel by the single tube vacuum is suitable for the single tube vacuum furnace, and can solve the problem that the inclusions in molten steel produced by the single tube vacuum furnace influence the production.
Aiming at the problem of 'flocculation flow' in continuous casting production caused by the fact that inclusions in the produced molten steel cannot be treated under the continuous production condition of the ultralow-carbon and ultralow-sulfur molten steel produced by a single-tube vacuum furnace, the invention changes the flow field of the vacuum molten steel and a novel calcium treatment method to reduce the denaturation of aluminum oxide inclusions and treat calcium into a hepta-aluminum-dodeca-calcium low-melting-point substance, and the ultralow-carbon and ultralow-sulfur molten steel can be continuously produced in a continuous casting machine by utilizing a novel method and a novel material.
The technical scheme of the invention controls the inclusions in the molten steel by a method for controlling the non-metallic inclusions in the steel through single tube vacuum, and can meet the requirement of RH process to realize the function of continuous casting of the produced molten steel. The method adopts a mode of molten steel flow field with double control of ladle low-blowing gas and vacuum circulating gas and novel flow control, can quickly remove aluminum oxide inclusions in molten steel, and can transform aluminum oxide into low-melting-point heptaaluminum dodecacalcium by utilizing silicon-calcium alloy creatively used in a vacuum furnace.
Example 1
The embodiment of the invention provides a method for controlling nonmetallic inclusions in steel in a single tube in vacuum, which comprises the following steps: changing vacuum net circulation and optimizing a molten steel flow field; adding vacuum calcium to treat alloy; wherein, the vacuum clean circulation is started every 3min, and the ladle argon low-blowing and the vacuum circulation gas are adjusted once.
Specifically, the clean cycle refers to a process for removing inclusions in vacuum, and specifically comprises the following steps:
net circulation 0-3min: molten steel rising side ladle low argon blowing set flow 15m 3 H, setting the flow rate of the vacuum circulating gas at the rising side to be 30m 3 /h；
Clean circulation for 3-6min: molten steel rising side ladle low argon blowing set flow rate of 10m 3 H, setting the flow rate of 20m on the ascending side of the vacuum circulating gas 3 /h；
Net circulation 6-9min: the flow rate of the ladle low-argon blowing at the ascending side of the molten steel is set to be 10m 3 H, setting the flow rate of the vacuum circulating gas at the rising side to be 15m 3 /h。
Specifically, the calcium-silicon alloy is added into the furnace at one time when the vacuum net circulation is 3min, and the calcium treatment of the molten steel is realized.
Performance indexes are as follows:
1) After 200kg of silicon-calcium alloy is added into the furnace, the calcium content in the molten steel is increased from 1ppm before calcium treatment to 15ppm, als in the molten steel is controlled according to 0.015-0.020%, the actual data is 0.0189%, the calcium-aluminum ratio is more than or equal to 0.07, and the stable casting of the molten steel can be ensured according to the metallurgical standard outside the furnace, wherein the calcium-aluminum ratio is more than or equal to 0.07.
2) In the casting process of the sheet billet continuous casting machine, the position of a casting stopper rod in the furnace is 15mm, the position of a casting stopper rod in the furnace is 14.7mm, the standard requirement of the position of the casting stopper rod is that the position of the casting stopper rod is not less than 0mm, and the production performance data meets the continuous casting requirement. The maximum liquid level fluctuation in the casting process is 0.8mm, the standard requirement is less than or equal to 1.0mm, and the liquid level fluctuation of production performance data meets the continuous casting requirement.
Comparative example 1
The double control of ladle low-blowing gas and vacuum circulating gas and a novel flow control molten steel flow field are not carried out.
Performance indexes are as follows:
the furnace does not carry out dual control of ladle low-blowing gas and vacuum circulating gas and a novel flow control molten steel flow field, but the calcium-silicon alloy is added into the furnace at the end of desulfurization, and the furnace is broken after vacuum circulation is carried out for 2 min. The content of calcium in the molten steel at the outlet is 12ppm, the aluminum at the outlet is 0.0163 percent, the ratio of calcium to aluminum in the molten steel is 0.073, and the calcium-aluminum ratio is more than or equal to 0.07 according to the standard specification. The molten steel is cast in a continuous casting machine of a sheet billet, the position of the secondary casting stopper rod is 12.6mm, the position of the secondary casting stopper rod is 16mm, and the requirements that the position of the standard casting stopper rod, namely the position of the secondary casting stopper rod, is more than or equal to 0mm are not met. The maximum liquid level fluctuation in the casting process is 2.4mm, and the maximum liquid level fluctuation does not meet the standard requirement and is less than or equal to 1.0mm.
Comparative example 2
The vacuum is net cycled without the addition of the Si-Ca alloy, and the other steps are as in example 1.
Performance indexes are as follows:
the furnace time is used for carrying out double control of ladle low-blowing gas and vacuum circulating gas and controlling a molten steel flow field in a novel mode, but no calcium-silicon alloy is added. The content of calcium in the molten steel at the outlet is 2ppm (belonging to the content of normal residual calcium), the content of aluminum at the outlet is 0.017 percent, and the ratio of calcium to aluminum in the molten steel is 0.01, so that the standard specification is not met. The molten steel is cast into the molten steel 183t in a thin slab continuous casting machine, the position of the stopper rod is cast 13mm when the furnace is started, the position of the stopper rod is cast 35mm when the furnace is stopped, the maximum liquid level fluctuation in the casting process is 3.5mm, and the standard requirement is less than or equal to 1.0mm. Comparative example 2 the casting was stopped in advance due to the flocculated flow of molten steel.
The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention in other forms, and any person skilled in the art may apply the above modifications or changes to the equivalent embodiments with equivalent changes, without departing from the technical spirit of the present invention, and any simple modification, equivalent change and change made to the above embodiments according to the technical spirit of the present invention still belong to the protection scope of the technical spirit of the present invention.
Claims (3)
1. A method for controlling nonmetallic inclusions in steel in a single tube vacuum mode is characterized by comprising the following steps: the method comprises the following steps:
changing vacuum net circulation and optimizing a molten steel flow field;
adding vacuum calcium to treat alloy;
wherein, the vacuum clean circulation is started every 3min, and the ladle argon low-blowing and the vacuum circulation gas are adjusted once.
2. The method for single tube vacuum control of nonmetallic inclusions in steel as claimed in claim 1, wherein: the clean circulation refers to a process for removing inclusions in vacuum, and comprises the following specific steps:
net circulation 0-3min: molten steel rising side ladle low argon blowing set flow 15m 3 H, setting the flow rate of 30m on the ascending side of the vacuum circulating gas 3 /h；
Clean circulation for 3-6min: the flow rate of the ladle low-argon blowing at the ascending side of the molten steel is set to be 10m 3 H, setting the flow rate of 20m on the ascending side of the vacuum circulating gas 3 /h；
Net circulation 6-9min: the flow rate of the ladle low-argon blowing at the ascending side of the molten steel is set to be 10m 3 H, setting the flow rate of the vacuum circulating gas at the rising side to be 15m 3 /h。
3. The single pipe vacuum control method for non-metallic inclusions in steel according to claim 1, wherein: the vacuum net circulation is carried out for 3min, and 200kg of silicon-calcium alloy is added into the furnace at one time to realize the calcium treatment of the molten steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210960635.0A CN115287412B (en) | 2022-08-11 | 2022-08-11 | Method for controlling nonmetallic inclusion in steel by single-tube vacuum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210960635.0A CN115287412B (en) | 2022-08-11 | 2022-08-11 | Method for controlling nonmetallic inclusion in steel by single-tube vacuum |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115287412A true CN115287412A (en) | 2022-11-04 |
| CN115287412B CN115287412B (en) | 2024-03-01 |
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| CN202210960635.0A Active CN115287412B (en) | 2022-08-11 | 2022-08-11 | Method for controlling nonmetallic inclusion in steel by single-tube vacuum |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002012907A (en) * | 2000-06-29 | 2002-01-15 | Nkk Corp | Method for operating metal melting furnace, smelting furnace, refining furnace and vacuum refining furnace |
| CN101392311A (en) * | 2007-09-22 | 2009-03-25 | 鞍钢股份有限公司 | RH-OB molten steel refining method |
| CN102134630A (en) * | 2011-04-07 | 2011-07-27 | 河北钢铁股份有限公司唐山分公司 | Calcium treatment method for refining molten steel under vacuum |
| CN103451507A (en) * | 2013-08-29 | 2013-12-18 | 鞍钢股份有限公司 | Method for reducing inclusion defect rate of coldly-rolled car plate |
| CN108660355A (en) * | 2017-03-29 | 2018-10-16 | 鞍钢股份有限公司 | A kind of smelting process of high-cleanness, high pipe line steel |
| CN109161641A (en) * | 2018-08-16 | 2019-01-08 | 日照钢铁控股集团有限公司 | A kind of high titanium steel production technology |
| CN110042202A (en) * | 2019-04-22 | 2019-07-23 | 南京钢铁股份有限公司 | A kind of RH refining furnace vacuum process calcium treating method |
-
2022
- 2022-08-11 CN CN202210960635.0A patent/CN115287412B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002012907A (en) * | 2000-06-29 | 2002-01-15 | Nkk Corp | Method for operating metal melting furnace, smelting furnace, refining furnace and vacuum refining furnace |
| CN101392311A (en) * | 2007-09-22 | 2009-03-25 | 鞍钢股份有限公司 | RH-OB molten steel refining method |
| CN102134630A (en) * | 2011-04-07 | 2011-07-27 | 河北钢铁股份有限公司唐山分公司 | Calcium treatment method for refining molten steel under vacuum |
| CN103451507A (en) * | 2013-08-29 | 2013-12-18 | 鞍钢股份有限公司 | Method for reducing inclusion defect rate of coldly-rolled car plate |
| CN108660355A (en) * | 2017-03-29 | 2018-10-16 | 鞍钢股份有限公司 | A kind of smelting process of high-cleanness, high pipe line steel |
| CN109161641A (en) * | 2018-08-16 | 2019-01-08 | 日照钢铁控股集团有限公司 | A kind of high titanium steel production technology |
| CN110042202A (en) * | 2019-04-22 | 2019-07-23 | 南京钢铁股份有限公司 | A kind of RH refining furnace vacuum process calcium treating method |
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| CN115287412B (en) | 2024-03-01 |
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