CN102146502A - RH pure steel smelting and deep decarburization process - Google Patents
RH pure 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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- 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 33
- 230000008569 process Effects 0.000 title claims abstract description 31
- 238000005261 decarburization Methods 0.000 title abstract description 26
- 238000003723 Smelting Methods 0.000 title abstract 2
- 239000007789 gas Substances 0.000 claims abstract description 51
- 239000000843 powder Substances 0.000 claims abstract description 42
- 239000007921 spray Substances 0.000 claims abstract description 17
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000007670 refining Methods 0.000 claims abstract description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910052786 argon Inorganic materials 0.000 claims abstract description 3
- 229910002091 carbon monoxide Inorganic materials 0.000 claims abstract description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 3
- 230000000630 rising effect Effects 0.000 claims description 9
- 238000005262 decarbonization Methods 0.000 claims description 8
- 235000011089 carbon dioxide Nutrition 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 abstract description 40
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 39
- 229910052760 oxygen Inorganic materials 0.000 abstract description 31
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 30
- 239000001301 oxygen Substances 0.000 abstract description 30
- 238000006243 chemical reaction Methods 0.000 abstract description 9
- 238000007664 blowing Methods 0.000 abstract description 4
- 229910045601 alloy Inorganic materials 0.000 abstract description 3
- 239000000956 alloy Substances 0.000 abstract description 3
- 230000003749 cleanliness Effects 0.000 abstract description 2
- 230000036284 oxygen consumption Effects 0.000 abstract description 2
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 abstract 2
- 230000001174 ascending effect Effects 0.000 abstract 1
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract 1
- 239000001569 carbon dioxide Substances 0.000 abstract 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 abstract 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract 1
- 239000001095 magnesium carbonate Substances 0.000 abstract 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 abstract 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 abstract 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 14
- 230000008676 import Effects 0.000 description 14
- 238000012946 outsourcing Methods 0.000 description 13
- 238000010410 dusting Methods 0.000 description 12
- 238000012545 processing Methods 0.000 description 12
- 238000005516 engineering process Methods 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 230000008859 change Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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Abstract
The invention provides a process for smelting and deep decarbonizing RH pure steel, which is characterized in that a through hole is arranged on the lower pipe wall of an RH ascending/descending pipe, the through hole is connected with an external air source or powder feeding equipment through a spray pipe, and CO is sprayed into molten steel through the spray pipe during RH refining2A gas. Or blowing CaCO into molten steel by using nitrogen, argon, carbon dioxide or carbon monoxide gas as carrier3、BaCO3、MgCO3、NaCO3、FeO、Fe2O3Or one or more powders of MnO. The invention has simple, flexible and convenient process and easy operation. By adopting the technical scheme of the invention, the decarburization reaction efficiency can be promoted, and the carbon content in the molten steel can be further reduced; the pollution of direct oxygen supply and decarburization to molten steel is reduced; 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 obviously improved, and the total oxygen content of pure steel is below 10 ppm.
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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| CN2010101081900A CN102146502A (en) | 2010-02-05 | 2010-02-05 | RH pure steel smelting and deep decarburization process |
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|---|---|---|---|
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| CN103572004B (en) * | 2013-10-14 | 2016-09-07 | 鞍钢股份有限公司 | RH composite 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 | Secondary refining method for 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 |
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| CN115287406A (en) * | 2022-07-18 | 2022-11-04 | 首钢集团有限公司 | Smelting method for removing impurities in steel |
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| 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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