CN115287412B - Method for controlling nonmetallic inclusion in steel by single-tube vacuum - Google Patents
Method for controlling nonmetallic inclusion in steel by single-tube vacuum Download PDFInfo
- Publication number
- CN115287412B CN115287412B CN202210960635.0A CN202210960635A CN115287412B CN 115287412 B CN115287412 B CN 115287412B CN 202210960635 A CN202210960635 A CN 202210960635A CN 115287412 B CN115287412 B CN 115287412B
- Authority
- CN
- China
- Prior art keywords
- vacuum
- molten steel
- steel
- calcium
- low
- 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.)
- Active
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 87
- 239000010959 steel Substances 0.000 title claims abstract description 87
- 238000000034 method Methods 0.000 title claims abstract description 29
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000007789 gas Substances 0.000 claims abstract description 25
- 239000011575 calcium Substances 0.000 claims abstract description 24
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 24
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 23
- 238000007664 blowing Methods 0.000 claims abstract description 21
- 229910052786 argon Inorganic materials 0.000 claims abstract description 16
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 5
- 239000000956 alloy Substances 0.000 claims abstract description 5
- 230000000630 rising effect Effects 0.000 claims description 24
- OSMSIOKMMFKNIL-UHFFFAOYSA-N calcium;silicon Chemical compound [Ca]=[Si] OSMSIOKMMFKNIL-UHFFFAOYSA-N 0.000 claims description 9
- 229910000882 Ca alloy Inorganic materials 0.000 claims description 7
- 239000012535 impurity Substances 0.000 claims description 6
- 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
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 abstract description 6
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 abstract description 5
- 239000000126 substance Substances 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 3
- 238000004925 denaturation Methods 0.000 abstract description 2
- 230000036425 denaturation Effects 0.000 abstract description 2
- -1 heptaaluminum dodecacalcium Chemical compound 0.000 abstract description 2
- 238000002844 melting Methods 0.000 abstract description 2
- 238000005266 casting Methods 0.000 description 14
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 230000016615 flocculation Effects 0.000 description 3
- 238000005189 flocculation Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 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
- 229910000676 Si alloy Inorganic materials 0.000 description 2
- ULGYAEQHFNJYML-UHFFFAOYSA-N [AlH3].[Ca] Chemical compound [AlH3].[Ca] ULGYAEQHFNJYML-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
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 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
- 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
- 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
- 239000002699 waste material 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
Landscapes
- 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 inclusion in steel by single-tube vacuum, which comprises the following steps: changing vacuum clean circulation and optimizing a molten steel flow field; adding vacuum calcium to treat the alloy; wherein, the vacuum clean circulation starts to be carried out once every 3min, and the ladle is adjusted to be low in argon blowing and vacuum circulation gas. The technical scheme of the invention can solve the problem that the production is influenced by the inclusion of molten steel produced by a single-tube vacuum furnace. The invention reduces the denaturation of aluminum oxide inclusion and treats the calcium into a heptaaluminum dodecacalcium low-melting point substance by changing a vacuum molten steel flow field and a novel calcium treatment method, 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 molten steel inclusion is controlled by a method of controlling nonmetallic inclusion in steel by single-tube vacuum, so that the function of continuous casting of produced molten steel can be realized by RH process.
Description
Technical Field
The invention relates to the technical field of steel manufacturing, in particular to a method for controlling nonmetallic inclusion in steel by single-tube vacuum.
Background
With the rapid development of the steel industry, the performance requirements on steel are more and more strict, and the steel not only has high strength, high low Wen Zhilie toughness and good weldability, but also has the following properties on steel in special areasTo find H resistance 2 S acid corrosion ability. In order to improve the hydrogen induced cracking resistance and sulfide stress corrosion cracking resistance of steel, the content of carbon, phosphorus, sulfur, oxygen, nitrogen and hydrogen impurity elements in the steel must be reduced as much as possible, the quantity, shape and size of nonmetallic inclusions are controlled, and the purity of molten steel is improved.
Because the steel grade has extremely strict requirements on the carbon and sulfur content in molten steel, if the carbon and sulfur content of the steel grade can be stably controlled, the yield of an acid-resistant pipeline is improved, and the steel grade can replace larger economic benefits in terms of waste judgment and steel use safety.
In the prior art, a single-tube vacuum furnace is adopted to produce ultra-low carbon and ultra-low sulfur molten steel, and under the continuous production condition, impurities in the produced molten steel cannot be treated, so that the problem of 'flocculation' in continuous casting production can be caused.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides a method for controlling nonmetallic inclusion in steel by single-tube vacuum, which realizes the control of molten steel inclusion produced by a single-tube vacuum furnace and continuous casting.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a method for controlling nonmetallic inclusion in steel by single-tube vacuum is characterized in that: the method comprises the following steps:
changing vacuum clean circulation and optimizing a molten steel flow field;
adding vacuum calcium to treat the alloy;
wherein, the vacuum clean circulation starts to be carried out once every 3min, and the ladle is adjusted to be low in argon blowing and vacuum circulation gas.
Wherein, the clean cycle refers to a process of removing impurities in vacuum, and the specific steps are as follows:
clean cycle 0-3min: molten steel rising side ladle low argon blowing set flow 15m 3 Flow rate of vacuum circulating gas at rising side of 30m 3 /h；
The clean cycle is 3-6min: molten steel rising side ladle low argon blowing set flow 10m 3 And/h, the flow rate of the rising side of the vacuum circulating gas is 20m 3 /h；
Clean cycle 6-9min: molten steel rising side ladle low argon blowing set flow 10m 3 And/h, setting flow rate of 15m on rising side of vacuum circulating gas 3 /h。
Wherein 200 kg/furnace of the silicon-calcium alloy is added at one time in 3min of vacuum clean circulation, so as to realize calcium treatment of molten steel.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the method for controlling nonmetallic inclusion in steel by single-tube vacuum is suitable for single-tube vacuum furnaces, and can solve the problem that the inclusion in molten steel produced by the single-tube vacuum furnaces affects production. The invention reduces the denaturation of aluminum oxide inclusion and treats the calcium into a heptaaluminum dodecacalcium low-melting point substance by changing a vacuum molten steel flow field and a novel calcium treatment method, 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 molten steel inclusion is controlled by a method of controlling nonmetallic inclusion in steel by single-tube vacuum, so that the function of continuous casting of produced molten steel can be realized by RH process.
Detailed Description
The following detailed description of the present invention is provided in connection with specific embodiments to further understand the objects, aspects and effects of the present invention, but is not intended to limit the scope of the invention as defined in the appended claims.
The embodiment of the invention provides a method for controlling nonmetallic inclusion in steel by single-tube vacuum, which comprises the following steps: changing vacuum clean circulation and optimizing a molten steel flow field; adding vacuum calcium to treat the alloy; wherein, the vacuum clean circulation starts to be carried out once every 3min, and the ladle is adjusted to be low in argon blowing and vacuum circulation gas.
Specifically, the clean cycle refers to a process of removing impurities in vacuum, and comprises the following specific steps:
clean cycle 0-3min: molten steel rising side ladle low argon blowing set flow 15m 3 Flow rate of vacuum circulating gas at rising side of 30m 3 /h；
The clean cycle is 3-6min: molten steel rising side ladle low argon blowing set flow 10m 3 /h, vacuumThe flow rate of the circulating gas at the rising side is 20m 3 /h；
Clean cycle 6-9min: molten steel rising side ladle low argon blowing set flow 10m 3 And/h, setting flow rate of 15m on rising side of vacuum circulating gas 3 /h。
Specifically, 200 kg/furnace of the silicon-calcium alloy is added at one time in 3min of vacuum clean circulation, so as to realize calcium treatment of molten steel.
The method for controlling nonmetallic inclusion in steel by single-tube vacuum is suitable for single-tube vacuum furnaces, and can solve the problem that the inclusion in molten steel produced by the single-tube vacuum furnaces affects production.
Aiming at the problem that the molten steel inclusions cannot be treated under the continuous production condition of producing the ultralow-carbon and ultralow-sulfur molten steel by a single-tube vacuum furnace, the continuous casting production "flocculation flow" is caused, the modification of the aluminum oxide inclusions is reduced and the calcium is treated into a seventy-two-calcium low-melting-point substance by changing a vacuum molten steel flow field and a novel calcium treatment method, and the ultralow-carbon and ultralow-sulfur molten steel can be continuously produced in a continuous casting machine by utilizing the novel method and the novel material.
According to the technical scheme, the molten steel inclusion is controlled by a method for controlling nonmetallic inclusion in steel in single-tube vacuum, so that the function of continuous casting of produced molten steel can be realized by an RH process. The aluminum oxide inclusion in the molten steel can be rapidly removed by adopting a mode of ladle low-blowing gas and vacuum circulating gas double control and a novel flow control molten steel flow field, and aluminum oxide can be deformed and denatured into low-melting-point hepta-dodecacalcium by creatively using a silicon-calcium alloy in a vacuum furnace.
Example 1
The embodiment of the invention provides a method for controlling nonmetallic inclusion in steel by single-tube vacuum, which comprises the following steps: changing vacuum clean circulation and optimizing a molten steel flow field; adding vacuum calcium to treat the alloy; wherein, the vacuum clean circulation starts to be carried out once every 3min, and the ladle is adjusted to be low in argon blowing and vacuum circulation gas.
Specifically, the clean cycle refers to a process of removing impurities in vacuum, and comprises the following specific steps:
clean cycle 0-3min: ladle low on rising side of molten steelArgon blowing set flow 15m 3 Flow rate of vacuum circulating gas at rising side of 30m 3 /h；
The clean cycle is 3-6min: molten steel rising side ladle low argon blowing set flow 10m 3 And/h, the flow rate of the rising side of the vacuum circulating gas is 20m 3 /h；
Clean cycle 6-9min: molten steel rising side ladle low argon blowing set flow 10m 3 And/h, setting flow rate of 15m on rising side of vacuum circulating gas 3 /h。
Specifically, 200 kg/furnace of the silicon-calcium alloy is added at one time in 3min of vacuum clean circulation, so as to realize calcium treatment of molten steel.
Performance index:
1) After 200 kg/furnace of the calcium-silicon alloy is added, the calcium content in molten steel is increased from 1ppm to 15ppm before calcium treatment, 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 calcium-aluminum ratio is more than or equal to 0.07 according to the external metallurgical standard of the furnace, so that stable casting of the molten steel can be ensured.
2) In the casting process of the molten steel in the sheet billet continuous casting machine, the furnace time is 15mm for casting the stopper rod position, the furnace time is 14.7mm for stopping the stopper rod position, the standard requirement is that the casting stopper rod position-stopping the stopper rod position is more than or equal to 0mm, and the production performance data meet 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 ladle low-blowing gas and vacuum circulating gas double control and the novel flow control molten steel flow field are not performed.
Performance index:
the furnace is not subjected to ladle low-blowing gas and vacuum circulating gas double control and novel flow control on a molten steel flow field, but 200 kg/furnace of the silicon-calcium alloy is added at the desulfurization end time, and vacuum circulation is carried out for 2min to break the air. The content of calcium in molten steel is 12ppm, the content of aluminum in molten steel is 0.0163%, the ratio of calcium to aluminum in molten steel is 0.073, and the ratio of calcium to aluminum in molten steel meets the standard specification and is more than or equal to 0.07. Molten steel is cast in a sheet billet continuous casting machine, the furnace casting stopper rod position is 12.6mm, the furnace casting stopper rod position is 16mm, and the requirement that the standard casting stopper rod position-casting stopper rod position is more than or equal to 0mm is not met. The maximum liquid level fluctuation in the casting process is 2.4mm, and the standard requirement is not more than or equal to 1.0mm.
Comparative example 2
No calcium silicon alloy was added during the vacuum clean cycle and the other steps were as in example 1.
Performance index:
the heat is used for ladle low-blowing gas and vacuum circulating gas double control and novel flow control of molten steel flow field, but no silicon-calcium alloy is added. The content of calcium in molten steel is 2ppm (belonging to the normal residual calcium content), the content of aluminum in molten steel is 0.017%, and the ratio of calcium to aluminum in molten steel is 0.01, and the standard specification is not satisfied. Molten steel is cast into 183t in a sheet billet continuous casting machine, the furnace casting stopper rod position is 13mm, the furnace casting stopper rod position is 35mm, 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 furnace casting was stopped in advance seriously due to molten steel flocculation.
The present invention is not limited to the above-mentioned embodiments, and any equivalent embodiments which can be changed or modified by the technical content disclosed above can be applied to other fields, but any simple modification, equivalent changes and modification made to the above-mentioned embodiments according to the technical substance of the present invention without departing from the technical content of the present invention still belong to the protection scope of the technical solution of the present invention.
Claims (1)
1. A method for controlling nonmetallic inclusion in steel by single-tube vacuum is characterized in that: the method comprises the following steps:
changing vacuum clean circulation and optimizing a molten steel flow field;
adding vacuum calcium to treat the alloy;
wherein, the vacuum clean circulation starts to be carried out once every 3 minutes, and the ladle is adjusted to be low in argon blowing and vacuum circulation gas;
the clean cycle refers to a process of removing impurities in vacuum, and comprises the following specific steps:
clean cycle 0-3min: molten steel rising side ladle low argon blowing set flow 15m 3 Flow rate of vacuum circulating gas at rising side of 30m 3 /h；
The clean cycle is 3-6min: molten steel rising side ladle low argon blowing set flow 10m 3 And/h, the flow rate of the rising side of the vacuum circulating gas is 20m 3 /h；
Clean cycle 6-9min: molten steel rising side ladle low argon blowing set flow 10m 3 And/h, setting flow rate of 15m on rising side of vacuum circulating gas 3 /h；
And adding 200kg of the silicon-calcium alloy into the furnace once in 3min in a vacuum clean cycle to realize calcium treatment of 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 CN115287412A (en) | 2022-11-04 |
| CN115287412B true CN115287412B (en) | 2024-03-01 |
Family
ID=83827725
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210960635.0A Active CN115287412B (en) | 2022-08-11 | 2022-08-11 | Method for controlling nonmetallic inclusion in steel by single-tube vacuum |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115287412B (en) |
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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115287412A (en) | 2022-11-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108823346B (en) | method for producing secondary flaw detection Q345R medium steel plate with low cost | |
| CN111363976B (en) | Microalloyed steel with long service life, high strength and toughness for high-speed rail plate spring and production process thereof | |
| CN111334702A (en) | Preparation method of high-strength high-nitrogen rare earth stainless bearing steel | |
| CN110527775B (en) | RH refining furnace chemical temperature rising method suitable for low-carbon aluminum killed steel | |
| CN113957338A (en) | Magnesium-containing 45 steel and preparation process thereof | |
| CN113416813A (en) | Method for controlling addition of rare earth alloy of rare earth structural steel | |
| CN111230061B (en) | Method for reducing carbon segregation of medium carbon steel round billet | |
| CN113862428A (en) | Ultra-low carbon steel smelting method | |
| CN115058642A (en) | Low-temperature-resistant steel rail smelting production method | |
| CN111944940A (en) | Method for controlling inclusions in IF steel | |
| CN102517428B (en) | Method for producing low compression ratio crack detection thick plate | |
| CN114622130A (en) | Rare earth alloy suitable for bainite steel inclusion control and adding process thereof | |
| CN114480987A (en) | Rare earth-containing NM600 wear-resistant steel plate and preparation method thereof | |
| CN109022661B (en) | Method for reducing heavy rail steel rail damage rate | |
| CN115287412B (en) | Method for controlling nonmetallic inclusion in steel by single-tube vacuum | |
| CN112899435A (en) | Smelting method of rare earth microalloyed steel | |
| CN109930064B (en) | Corrosion-resistant heat-resistant steel for high-pressure boiler pipe and production method thereof | |
| EP3674424B1 (en) | Smelting method for ultra-low carbon 13cr stainless steel | |
| CN111411189A (en) | Method for producing hydrogen-induced crack resistant steel grade by using ultra-wide thin-ratio slab continuous casting machine | |
| CN115198058B (en) | Smelting method of low-carbon low-sulfur ultralow-silicon welding wire steel | |
| CN102211155B (en) | Calcium treatment method of low-carbon low silicon aluminium killed steels under CSP (Cast Steel Plate) condition | |
| CN111961805B (en) | High manganese steel liquid purification method, product and application | |
| CN115074624A (en) | Steel for hydrogen sulfide corrosion resistant rare earth-containing heat exchange tube and preparation method thereof | |
| CN113528747A (en) | Smelting method of ultra-low carbon phosphorus-added reinforced steel | |
| CN112593036A (en) | Low-silicon microalloyed high-temperature carburized gear steel and manufacturing method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |