CN102146502A - RH (ruhrstahl heraeus) clean steel smelting and deep decarburization process - Google Patents
RH (ruhrstahl heraeus) clean steel smelting and deep decarburization process Download PDFInfo
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- CN102146502A CN102146502A CN2010101081900A CN201010108190A CN102146502A CN 102146502 A CN102146502 A CN 102146502A CN 2010101081900 A CN2010101081900 A CN 2010101081900A CN 201010108190 A CN201010108190 A CN 201010108190A CN 102146502 A CN102146502 A CN 102146502A
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Abstract
The invention provides a ruhrstahl heraeus (RH) clean steel smelting and deep decarburization process. The process is characterized in that: the lower pipe wall of an RH ascending/descending pipe is provided with a through hole, the RH ascending/descending pipe is connected with an external gas source or powder feeding equipment through a spray pipe, and CO2 gas is blown into the molten steel through the spray pipe during RH refining. Or, powder of one or more of CaCO3, BaCO3, MgCO3, NaCO3, FeO, Fe2O3 and MnO is/are blown into the molten steel by using nitrogen, argon, carbon dioxide or carbon monoxide as a carrier. The process is simple, flexible, convenient and easy in operation. By adopting the technical scheme, the decarburization reaction efficiency can be promoted, and the carbon content of the molten steel can be further reduced; pollution of direct oxygen supply decarburization to the molten steel is reduced; and the oxygen consumption of molten steel decarburization is reduced, so that the consumption of deoxidation alloy is reduced, the number of oxide inclusions is obviously reduced, the cleanliness of the molten steel is remarkably improved, and the oxygen content of the clean steel is less than 10ppm.
Description
Technical field
The invention belongs to metallurgical technology field, relate in particular to a kind of RH Clean Steel and smelt and dark carbonization treatment technology.
Background technology
The RH decarburization is a principle of dynamics of utilizing C, O reaction generation CO gas in the steel, by reducing CO dividing potential drop in the vacuum, C in the steel, O reaction is carried out to the direction that generates CO; Decarburization proceeds to the later stage because the O content in the molten steel is low, the mass transfer of O becomes the restricted link of decarburization, for further reducing carbon content, take to optimize molten steel C, the dynamic conditions of O reaction, Wang Feng, the application practice of Yang Xiaojiang＜RH vacuum refining process〉the metal world [J], 2008.5, p.18 the decarburization later stage takes to reduce vacuum in the document, the enlarged link flow promotes C, further carrying out of O reaction, Zhao Yunzhu,＜RH produces putting into practice of ultra low-carbon steel〉Anshan iron and steel plant technology [J], 2008.2, spray [O] content of p.49 taking oxygen gun blowing to improve in the molten steel in the document promotes C, further carrying out of O reaction.
The RH decarburization later stage adopts oxygen gun blowing, reduction vacuum tightness, raising circulation can reduce carbon content to a certain extent, but also exist following shortcoming: (1) oxygen blast meeting causes the oxidation of other elements, causes the molten steel inclusion content to raise.(2) remove the consumption that oxygen superfluous in the molten steel has increased deoxygenated alloy.(3) reduction of vacuum tightness is subjected to device-restrictive that certain limitation is arranged.(4) raising of circulation can be quickened the anti-material erosion of vacuum chamber, be subjected to the appointed condition restriction that certain limitation is arranged simultaneously.
Therefore, the dark decarburization technique of research RH, significant.
Summary of the invention
The objective of the invention is to overcome the existing in prior technology problem, provide a kind of and be applicable to what various ultra low-carbon steels were produced, to molten steel, spray into CO by the jet pipe that imports from RH rising/downtake bottom
2Gas or powder are realized the method for dark decarburization.
In order to solve the problems of the technologies described above, the present invention is achieved in that this RH Clean Steel is smelted and the characteristics of dark decarbonization process are, on the tube wall of the bottom of RH rising/downtake, have through hole, be connected with external air source or powder feeding equipment by jet pipe, RH between refining period by the jet pipe CO that in molten steel, jets
2Gas.Perhaps, be the carrier CaCO that in molten steel, jets with nitrogen, argon gas, carbonic acid gas or CO (carbon monoxide converter) gas
3, BaCO
3, MgCO
3, NaCO
3, FeO, Fe
2O
3Or one or more pulvis among the MnO.
The position of through hole of the present invention is apart from RH downtake lower edge 100～500mm, and it axially is 10～90 ° with rising/downtake upper axial, and quantity is 1～10; Described through hole is along the vertical arranged distribution of rising/downtake direction, or radial distribution, or shape distributes in the shape of a spiral, or is the asymmetric distribution in space; The internal diameter of described jet pipe is 1～30mm.
The granularity of pulvis of the present invention is 0.001～3mm, and the straying quatity of pulvis is 0.1～10kg/t steel; The single tube gaseous tension of described jet pipe is 0.1～2Mpa, and the single tube gas flow is 3～40Nm
3/ h.
The time of spraying into of pulvis of the present invention can begin the back 0～20 minute in the RH refining, perhaps when [O] takes off the scarce capacity of [C].
React (1) CO of generation after the carbonate pulvis sprays in the technical solution of the present invention
2Bubble is equivalent to a plurality of little vacuum chambers, has quickened the reaction between carbon and oxygen in the molten steel, CO
2With [C] in the molten steel react (2) generate CO and discharge molten steel, further reduced carbon content in the molten steel; Pulvis FeO, MnO react respectively after spraying into molten steel (3), (4) have strengthened the oxygen gesture in the molten steel, have promoted the generation of reaction between carbon and oxygen in the molten steel, have further reduced the carbon content in the molten steel.
CaCO
3＝CaO+CO
2 (1)
CO
2+[C]＝2CO
FeO+[C]＝Fe+CO
MnO+[C]＝Mn+CO
Technology of the present invention is simple, flexible, convenient, easy handling.Adopt technical solution of the present invention can promote decarburizing reaction efficient, further reduce carbon content in the molten steel; Reduced the pollution of direct oxygen supply decarburization to molten steel; Reduce molten steel decarburization oxygen-consumption, thereby reduce the usage quantity of deoxygenated alloy, the quantity of oxide inclusion obviously reduces, and the cleanliness factor of molten steel significantly improves, and the total oxygen of Clean Steel is all below 10ppm.
Description of drawings
Accompanying drawing is installed the synoptic diagram of jet pipe on the tube wall of RH rising/downtake bottom for the present invention.
1 is rising/downtake tube wall among the figure, and 2 is through hole, and 3 is jet pipe.
Embodiment
In conjunction with specific embodiments the present invention is described in further detail with reference to the accompanying drawings.But protection scope of the present invention is not limited by specific embodiment, should be as the criterion with claims.In addition, with under the prerequisite of technical solution of the present invention, any change or change that those of ordinary skills that the present invention did are realized easily all will fall within the claim scope of the present invention.
In 1 boring of RH upcast bottom tube wall, through hole 2 quantity are 2, through hole 2 positions are apart from RH upcast lower edge 300mm, and the axial angle of 2 through holes is 120 °, import jet pipe 3 in the through hole 2, jet pipe 3 stretches out, be fixed on the vacuum chamber housing, epitaxial part is reserved interface, and interface is connected with outsourcing powder feeding equipment, the internal diameter of jet pipe 3 is 24mm, the axial and axial 45 ° of angles of RH upcast of through hole 2.
In ultra low-carbon steel RH carbon rejection process, after opening 10min, passes through main valve jet pipe 3 with CaCO
3Pulvis sprays in the molten steel, and the add-on of pulvis is 1～3kg/t steel, and powder granularity＜0.5mm, powder feeding gas are Ar, and supply gas pressure 0.8MPa, single tube gas flow are 15m
3/ h.The molten steel carbon content is stabilized in＜20ppm after the processing RH decarburization of dusting, and the total oxygen of strand is 10ppm.
Embodiment 2
In 1 boring of RH upcast bottom tube wall, through hole 2 quantity are 1, through hole 2 positions are apart from RH upcast lower edge 500mm, import jet pipe 3 in the through hole 2, jet pipe 3 stretches out, and is fixed on the vacuum chamber housing, epitaxial part is reserved interface, interface is connected with outsourcing powder feeding equipment, and the internal diameter of jet pipe 3 is 30mm, and the axial and RH upcast of through hole 2 axially is 45 ° of angles.
In ultra low-carbon steel RH carbon rejection process, after moving into the main valve unlatching, ladle passes through jet pipe 3 with MgCO
3Pulvis sprays in the molten steel, and the add-on of pulvis is 3～6kg/t steel, and powder granularity 0.5～2mm, powder feeding gas are CO
2, supply gas pressure 1.0MPa, single tube gas flow are 30m
3/ h, the molten steel carbon content is stabilized in＜10ppm after the processing RH decarburization of dusting,, the total oxygen of strand is 11ppm.
In 1 boring of RH downtake bottom tube wall, through hole 2 quantity are 6, and through hole 2 positions are apart from RH downtake lower edge 200mm, and through hole is symmetrically distributed along RH downtake circumference, the axial angle of adjacent 2 through holes is 60 °, import jet pipe 3 in the through hole 2, jet pipe 3 stretches out, and is fixed on the vacuum chamber housing, epitaxial part is reserved interface, interface is connected with outsourcing powder feeding equipment, and the internal diameter of jet pipe 3 is 16mm, and the axial and RH downtake of through hole 2 axially is 45 ° of angles.
In ultra low-carbon steel RH carbon rejection process, after main valve is opened 10min, decide oxygen a
[o]Less than 100ppm, when carbon rejection process is slow, by jet pipe 3 with BaCO
3+ CaCO
3Pulvis sprays in the molten steel, and the add-on of pulvis is 7～9kg/t steel, and powder granularity 0.05～2mm, powder feeding gas are N
1, supply gas pressure 1MPa, single tube gas flow are 28m
3/ h, the molten steel carbon content is stabilized in＜10ppm after the processing RH decarburization of dusting, and the total oxygen of strand is 7ppm.
Embodiment 4
In 1 boring of RH downtake bottom tube wall, through hole 2 quantity are 1, through hole 2 positions are apart from RH downtake lower edge 200mm, import jet pipe 3 in the through hole 2, jet pipe 3 stretches out, and is fixed on the vacuum chamber housing, epitaxial part is reserved interface, interface is connected with outsourcing powder feeding equipment, and the internal diameter of jet pipe 3 is 20mm, and the axial and RH downtake of through hole 2 axially is 30 ° of angles.
In ultra low-carbon steel RH carbon rejection process, after ladle is moved into main valve and is opened, by jet pipe 3 with NaCO
3Pulvis sprays in the molten steel, and the add-on of pulvis is 3～6kg/t steel, and powder granularity 0.5～2mm, powder feeding gas are CO, and supply gas pressure 1.0MPa, single tube gas flow are 30m
3/ h, the molten steel carbon content is stabilized in＜10ppm after the processing RH decarburization of dusting, and the total oxygen of strand is 11ppm.
Embodiment 5
In 1 boring of RH downtake bottom tube wall, through hole 2 quantity are 8, through hole 2 positions are apart from RH downtake lower edge 180mm, import jet pipe 3 in the through hole 2, jet pipe 3 stretches out, and is fixed on the vacuum chamber housing, epitaxial part is reserved interface, interface is connected with outsourcing powder feeding equipment, and the internal diameter of jet pipe 3 is 22mm, and the axial and RH downtake of through hole 2 axially is 30 ° of angles.
In ultra low-carbon steel RH carbon rejection process, after main valve is opened 10min, decide oxygen a
[o]Less than 100ppm, when carbon rejection process is slow, by jet pipe 3 with BaCO
3+ CaCO
3Pulvis sprays in the molten steel, and the add-on of pulvis is 1～3kg/t steel, and powder granularity 0.02～2mm, powder feeding gas are CO
2, supply gas pressure 1.5MPa, single tube gas flow are 18m
3/ h, the molten steel carbon content is stabilized in＜10ppm after the processing Rm decarburization of dusting,, the total oxygen of strand is 7ppm.
Embodiment 6
In 1 boring of RH downtake bottom tube wall, through hole 2 quantity are 2, through hole 2 positions are apart from RH downtake lower edge 200mm, and the axial angle of 2 through holes is 120 °, import jet pipe 3 in the through hole 2, jet pipe 3 stretches out, be fixed on the vacuum chamber housing, epitaxial part is reserved interface, and interface is connected with outsourcing powder feeding equipment, the internal diameter of jet pipe 3 is 16mm, and the axial and RH downtake of through hole 2 axially is 45 ° of angles.
In ultra low-carbon steel RH carbon rejection process, after main valve is opened 10min, decide oxygen a
[o]Less than 100ppm, when carbon rejection process is slow, the FeO pulvis is sprayed in the molten steel by jet pipe 3, the add-on of pulvis is 0.1～2kg/t steel, and powder granularity is less than 2mm, and powder feeding gas is Ar, and supply gas pressure 1.5MPa, single tube gas flow are 15m
3/ h, the molten steel carbon content is stabilized in＜11ppm after the processing RH decarburization of dusting, and the total oxygen of strand is 10ppm.
Embodiment 7
In 1 boring of RH downtake bottom tube wall, through hole 2 quantity are 1, through hole 2 positions are apart from RH downtake lower edge 300mm, import jet pipe 3 in the through hole 2, jet pipe 3 stretches out, and is fixed on the vacuum chamber housing, epitaxial part is reserved interface, interface is connected with outsourcing powder feeding equipment, and the internal diameter of jet pipe 3 is 6mm, and the axial and RH downtake of through hole 2 axially is 45 ° of angles.
In ultra low-carbon steel RH carbon rejection process, after main valve is opened 12min, decide oxygen a
[o]Less than 120ppm, when carbon rejection process is slow, by jet pipe 3 with Fe
2O
3Pulvis sprays in the molten steel, and the add-on of pulvis is 0.1～2kg/t steel, and powder granularity is less than 2mm, and powder feeding gas is Ar, and supply gas pressure 1.5MPa, single tube gas flow are 15m
3/ h, the molten steel carbon content is stabilized in＜12ppm after the processing RH decarburization of dusting,, the total oxygen of strand is 9ppm.
Embodiment 8
In 1 boring of RH downtake bottom tube wall, through hole 2 quantity are 5, the axial angle of 2 through holes is 120 °, and through hole 2 positions import jet pipe 3 apart from RH downtake lower edge 300mm in the through hole 2, jet pipe 3 stretches out, be fixed on the vacuum chamber housing, epitaxial part is reserved interface, and interface is connected with outsourcing powder feeding equipment, the internal diameter of jet pipe 3 is 7mm, and the axial and RH downtake of through hole 2 axially is 30 ° of angles.
In ultra low-carbon steel RH carbon rejection process, after main valve is opened 15min, decide oxygen a
[o]Less than 150ppm, when carbon rejection process is slow, the FeO+MnO pulvis is sprayed in the molten steel by jet pipe 3, the add-on of pulvis is 0.1～2kg/t steel, and powder granularity is less than 2mm, and powder feeding gas is Ar, and supply gas pressure 1.5MPa, single tube gas flow are 15m
3/ h, the molten steel carbon content is stabilized in＜10ppm after the processing RH decarburization of dusting, and the total oxygen of strand is 8ppm.
Embodiment 9
In 1 boring of RH downtake bottom tube wall, through hole 2 quantity are 2, the axial angle of 2 through holes is 120 °, and through hole 2 positions import jet pipe 3 apart from RH downtake lower edge 200mm in the through hole 2, jet pipe 3 stretches out, be fixed on the vacuum chamber housing, epitaxial part is reserved interface, and interface is connected with outsourcing powder feeding equipment, the internal diameter of jet pipe 3 is 17mm, the axial and axial 45 ° of angles of RH downtake of through hole 2.
In ultra low-carbon steel RH carbon rejection process, after main valve is opened 17min, decide oxygen a
[o]Less than 180ppm, when carbon rejection process is slow, the FeO pulvis is sprayed in the molten steel by jet pipe 3, the add-on of pulvis is 0.1～2kg/t steel, and powder granularity is less than 2mm, and powder feeding gas is CO, and supply gas pressure 1.5MPa, single tube gas flow are 15m
3/ h, the molten steel carbon content is stabilized in＜11ppm after the processing RH decarburization of dusting, and the total oxygen of strand is 10ppm.
Embodiment 10
In 1 boring of RH downtake bottom tube wall, through hole 2 quantity are 3, the axial angle of 2 through holes is 120 °, and through hole 2 positions import jet pipe 3 apart from RH downtake lower edge 200mm in the through hole 2, jet pipe 3 stretches out, be fixed on the vacuum chamber housing, epitaxial part is reserved interface, and interface is connected with outsourcing powder feeding equipment, the internal diameter of jet pipe 3 is 13mm, and the axial and RH downtake of through hole 2 axially is 45 ° of angles.
In ultra low-carbon steel RH carbon rejection process, after main valve is opened, by jet pipe 3 with MgCO
3+ NaCO
3Pulvis sprays in the molten steel, and the add-on of pulvis is 5～7kg/t steel, and powder granularity is less than 1mm, and powder feeding gas is N
2, supply gas pressure 1.5MPa, single tube gas flow are 15m
3/ h, the molten steel carbon content is stabilized in＜10ppm after the processing RH decarburization of dusting, and the total oxygen of strand is 9ppm.
Embodiment 11
In 1 boring of RH downtake bottom tube wall, through hole 2 quantity are 6, and through hole 2 positions are apart from RH downtake lower edge 200mm, and through hole is symmetrically distributed along RH downtake circumference, the axial angle of adjacent 2 through holes is 60 °, import jet pipe 3 in the through hole 2, jet pipe 3 stretches out, and is fixed on the vacuum chamber housing, epitaxial part is reserved interface, interface is connected with outsourcing powder feeding equipment, and the internal diameter of jet pipe 3 is 16mm, and the axial and RH downtake of through hole 2 axially is 45 ° of angles.
In ultra low-carbon steel RH carbon rejection process, after main valve is opened, by jet pipe 3 with NaCO
3Pulvis sprays in the molten steel, and the add-on of pulvis is 3～5kg/t steel, and powder granularity is less than 0.5 μ m, and powder feeding gas is N
2, supply gas pressure 1.5MPa, single tube gas flow are 35m
3/ h, the molten steel carbon content is stabilized in＜11ppm after the processing RH decarburization of dusting,, the total oxygen of strand is 10ppm.
Embodiment 12
In 1 boring of RH downtake bottom tube wall, through hole 2 quantity are 6, and through hole 2 positions are apart from RH downtake lower edge 200mm, and through hole is symmetrically distributed along RH downtake circumference, the axial angle of adjacent 2 through holes is 60 °, import jet pipe 3 in the through hole 2, jet pipe 3 stretches out, and is fixed on the vacuum chamber housing, epitaxial part is reserved interface, interface is connected with outsourcing powder feeding equipment, and the internal diameter of jet pipe 3 is 26mm, and the axial and RH downtake of through hole 2 axially is 45 ° of angles.
In ultra low-carbon steel RH carbon rejection process, after main valve is opened, by jet pipe 3 with CaCO
3Pulvis sprays in the molten steel, and the add-on of pulvis is 3～5kg/t steel, and powder granularity is less than 1mm, and powder feeding gas is carbonic acid gas, and supply gas pressure 1MPa, single tube gas flow are 7m
3/ h, the molten steel carbon content is stabilized in＜10ppm after the processing RH decarburization of dusting, and the total oxygen of strand is 7ppm.
Embodiment 13
In 1 boring of RH downtake bottom tube wall, through hole 2 quantity are 6, and through hole 2 positions are apart from RH downtake lower edge 200mm, and through hole is symmetrically distributed along RH downtake circumference, the axial angle of adjacent 2 through holes is 60 °, import jet pipe 3 in the through hole 2, jet pipe 3 stretches out, and is fixed on the vacuum chamber housing, epitaxial part is reserved interface, interface is connected with outsourcing powder feeding equipment, and the internal diameter of jet pipe 3 is 20mm, and the axial and RH downtake of through hole 2 axially is 45 ° of angles.
In ultra low-carbon steel RH carbon rejection process, it is 20ppm that molten steel is moved into oxygen activity, after main valve is opened, by jet pipe 3 with CO
2Gas directly sprays in the molten steel, and the winding-up time is 15～16min, and supply gas pressure 15.0atm, single tube gas flow are 60L/min, and molten steel [C] is stabilized in＜10ppm after air blowing treatment RH decarburization, the T[O of strand] be 7ppm.
Claims (6)
1. a RH Clean Steel is smelted and dark decarbonization process, it is characterized in that having through hole on the tube wall of the bottom of RH rising/downtake, be connected with external air source or powder feeding equipment by jet pipe, RH between refining period by the jet pipe CO that in molten steel, jets
2Gas; Be the carrier CaCO that in molten steel, jets perhaps with nitrogen, argon gas, carbonic acid gas or CO (carbon monoxide converter) gas
3, BaCO
3, MgCO
3, NaCO
3, FeO, Fe
2O
3Or one or more pulvis among the MnO.
2. RH Clean Steel according to claim 1 is smelted and dark decarbonization process, the position that it is characterized in that described through hole is apart from RH downtake lower edge 100～500mm, it axially is 10～90 ° with rising/downtake upper axial, quantity is 1～10, described through hole is along the vertical arranged distribution of rising/downtake direction, or radial distribution, or shape distributes in the shape of a spiral, or be the asymmetric distribution in space, the internal diameter of described jet pipe is 1～30mm.
3. RH Clean Steel according to claim 1 and 2 is smelted and dark decarbonization process, and the granularity that it is characterized in that described pulvis is 0.001～3mm, and the straying quatity of pulvis is 0.1～10kg/t steel.
4. RH Clean Steel according to claim 1 and 2 is smelted and dark decarbonization process, it is characterized in that described jet pipe single tube gaseous tension is 0.1～2Mpa, and the single tube gas flow is 3～40Nm
3/ h.
5. RH Clean Steel according to claim 1 and 2 is smelted and dark decarbonization process, it is characterized in that the time that sprays into of described pulvis began the back 0～20 minute in the RH refining.
6. RH Clean Steel according to claim 1 is smelted and dark decarbonization process, and the time that sprays into that it is characterized in that described pulvis is when adopting [O] to take off the scarce capacity of [C].
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101081900A CN102146502A (en) | 2010-02-05 | 2010-02-05 | RH (ruhrstahl heraeus) clean steel smelting and deep decarburization process |
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|---|---|---|---|
| CN2010101081900A CN102146502A (en) | 2010-02-05 | 2010-02-05 | RH (ruhrstahl heraeus) clean steel smelting and deep decarburization process |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102690924A (en) * | 2012-05-25 | 2012-09-26 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for controlling nitrogen content of ultra-low-carbon steel |
| CN103572004B (en) * | 2013-10-14 | 2016-09-07 | 鞍钢股份有限公司 | A kind of RH compound decarburization method |
| CN106119465A (en) * | 2016-08-01 | 2016-11-16 | 山东钢铁股份有限公司 | A kind of device and method keeping RH ladle top slag reproducibility |
| CN106282489A (en) * | 2015-05-28 | 2017-01-04 | 鞍钢股份有限公司 | A kind of double refining method improving Cleanliness of Molten Steel |
| CN111094598A (en) * | 2017-09-18 | 2020-05-01 | 株式会社Posco | Vacuum degassing apparatus and refining method |
| CN113388717A (en) * | 2021-03-30 | 2021-09-14 | 北京首钢股份有限公司 | High-efficiency RH decarburization method |
| CN115287406A (en) * | 2022-07-18 | 2022-11-04 | 首钢集团有限公司 | Smelting method for removing impurities in steel |
| CN117230281A (en) * | 2023-11-14 | 2023-12-15 | 山西同航特钢有限公司 | Production process of high-phosphorus IF steel |
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2010
- 2010-02-05 CN CN2010101081900A patent/CN102146502A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102690924A (en) * | 2012-05-25 | 2012-09-26 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for controlling nitrogen content of ultra-low-carbon steel |
| CN103572004B (en) * | 2013-10-14 | 2016-09-07 | 鞍钢股份有限公司 | A kind of RH compound decarburization method |
| CN106282489A (en) * | 2015-05-28 | 2017-01-04 | 鞍钢股份有限公司 | A kind of double refining method improving Cleanliness of Molten Steel |
| CN106119465A (en) * | 2016-08-01 | 2016-11-16 | 山东钢铁股份有限公司 | A kind of device and method keeping RH ladle top slag reproducibility |
| CN106119465B (en) * | 2016-08-01 | 2018-02-16 | 山东钢铁股份有限公司 | A kind of device and method of holding RH ladle top slag reproducibilities |
| CN111094598A (en) * | 2017-09-18 | 2020-05-01 | 株式会社Posco | Vacuum degassing apparatus and refining method |
| CN113388717A (en) * | 2021-03-30 | 2021-09-14 | 北京首钢股份有限公司 | High-efficiency RH decarburization method |
| CN115287406A (en) * | 2022-07-18 | 2022-11-04 | 首钢集团有限公司 | Smelting method for removing impurities in steel |
| CN115287406B (en) * | 2022-07-18 | 2023-07-11 | 首钢集团有限公司 | Smelting method for removing inclusions in steel |
| CN117230281A (en) * | 2023-11-14 | 2023-12-15 | 山西同航特钢有限公司 | Production process of high-phosphorus IF steel |
| CN117230281B (en) * | 2023-11-14 | 2024-01-23 | 山西同航特钢有限公司 | Production process of high-phosphorus IF steel |
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Application publication date: 20110810 |