CN102560002A - Method for removing fine impurities of molten steel and blowing device adopted by the method - Google Patents
Method for removing fine impurities of molten steel and blowing device adopted by the method Download PDFInfo
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- CN102560002A CN102560002A CN201010584905XA CN201010584905A CN102560002A CN 102560002 A CN102560002 A CN 102560002A CN 201010584905X A CN201010584905X A CN 201010584905XA CN 201010584905 A CN201010584905 A CN 201010584905A CN 102560002 A CN102560002 A CN 102560002A
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Abstract
The invention relates to a method for removing fine impurities of molten steel and a blowing device adopted by the method. In RH refining, inert gas and carbonate powder are blown into molten steel by the blowing device. The method for removing fine impurities of molten steel comprises the following steps of 1, connecting the blowing device and a gas source, and blowing inert gas into molten steel in molten steel circulation, and 2, connecting a powder feeding device and the blowing device, and blowing carbonate powder into the molten steel so that fine slag drops and bubbles are produced by carbonate powder decomposition at a high temperature and adhere to impurities in floating to remove the impurities, wherein sizes of the fine slag drops and the bubbles can be controlled by adjustment of carbonate powder particle sizes. Compared with the prior art, the method provided by the invention has the advantages that 1, impurity removal efficiency is high; sizes of the fine slag drops and the bubbles are small; diffuse distribution of the fine slag drops and the bubbles is realized; fine impurities of steel can be effectively removed; and impurity removal efficiency is improved obviously; and 2, the method provided by the invention is conducive to removal of fine Al2O3 impurities of steel; and tundish submersed nozzle blocking is relieved.
Description
Technical field
The present invention relates to a kind of ferrous metallurgy furnace outer refining technology field, remove the method and the blowing device of fine foreign matter in the molten steel in particularly a kind of RH refining process.
Background technology
In recent years, because the progress of ladle refining technology and continuous casting technology has reduced the content of oxide based non-metallic inclusion, thereby can produce the good molten steel of cleanliness factor.But, because the purposes of steel and the harshness of working conditions are strict more to the requirement of steel inclusion.Inclusion is main relevant with the quantity and the size of inclusion to the harm of steel, and inclusion is carried out quality control, and primary is the quantity and the size of control inclusion.Limit with smelting cost because steel grade is different, the requirement of inclusion also is not quite similar, ordinary steel; Total oxygen 50ppm, inclusion size are below 50 μ m; Usually steel performance is not constituted serious quality problems, yet concerning IF steel, silicon steel, cord steel and pipe line steel etc., this index possibly not reach requirement at all; For example, the steel cord requires Al
2O
3Be mingled with less than 10～15 μ m, could satisfy the requirement that 20 myriametres in the drawing process do not have broken end.
The RH refining is a kind of important furnace outer refining technology, has short, series of advantages such as throughput is big, refining effect good, easy operation of processing cycle, in STEELMAKING PRODUCTION, has obtained widespread use.At present; RH has been changed into by original single degassing equipment and has comprised dark decarburization, desulfurization, dephosphorization, temperature compensation, uniform temperature and the multi-functional external refining equipment that becomes to grade; And along with the expansion of Iron And Steel Industry development of technology and refining function; RH is showing significant meliority aspect production ultra low-carbon steel and the ultra-clean steel, becomes the outer treatment unit of a kind of important stove in the modernized steel mill.
In order better to realize desulfurization, dephosphorization and to remove the effect of inclusion, people have developed the RH technology of dusting, and the difference that is blown into the position according to pulvis is divided into RH-PB (IJ) method, RH-PB (OB) method and RH-PTB (top-blown powder) method; At present; Using more is the RH-PTB method, and this method dusting speed is fast, and the amount of dusting is big; But higher to equipment requirements, and the oxygen blast of dusting can not be carried out simultaneously.
RH dusts and slag-steel is reflected under the vacuum condition carry out; Farthest eliminate of the influence of top slag, therefore can significantly improve the efficient of dephosphorization, desulfurization, simultaneously dephosphorization, desulfurization; The RH powder injection process can also play the effect that impels inclusion modification, helps the removal of inclusion.In addition, there is the bibliographical information powder injection process also can improve the ability of gas out-phase forming core in the steel, helps improving degassing efficiency.
Summary of the invention
The purpose of this invention is to provide a kind of method and blowing device of removing fine foreign matter in the molten steel; When realizing the RH refining to effective control of non-metallic inclusion in the molten steel; Total oxygen in the steel is controlled to 3～15ppm; The equivalent diameter of inclusion is controlled to be 0.5～10 μ m, and the inclusion average area is controlled at 0.001～0.008%.
For solving the problems of the technologies described above, technical scheme of the present invention is:
A kind of method of removing fine foreign matter in the molten steel is characterized in that, in the RH refining process, through blowing device in molten steel, jet rare gas element and carbonate pulvis, its operation steps is following:
1) blowing device is connected with source of the gas,, in molten steel, is blown into rare gas element at the molten steel circulation time; Gas flow is 10～500L/min, and pressure is 1.0～15 standard atmospheric pressures, and the small-flow gas that is blown into is under the shock action of decline molten steel; Gas is separated into tiny bubble; Bubble floats in ladle, and the while bumps with inclusion and adheres to, thereby promotes inclusion removal;
2) powder feeding equipment is connected with blowing device; Winding-up carbonate pulvis in molten steel, the size range of pulvis is 0～3mm (but not comprising 0), rare gas element is as carrier; Gas flow is 10～800L/min; Pressure is 1.0～15 standard atmospheric pressures, and the carbonate pulvis the tiny slag of generation at high temperature takes place to decompose drips and bubble, and bubble and slag drip in the floating-upward process and bump, adhere to inclusion; Thereby removal inclusion, bubble and slag drip the big I of size through regulating the size control of carbonate pulvis.
Described blowing device comprises RH rising/downtake, it is characterized in that, in RH rising/downtake bottom hole is set, and hole passes RH Vakuumkammer outer wall through jet pipe and is connected with pipe interface.
Described hole location is apart from RH rising/downtake lower edge 100～300mm, and hole also can be along downtake radial distribution or shape distribution or the asymmetric distribution in space in the shape of a spiral along the vertical arranged distribution of downtake direction.
Described pore quantity is 1～10, and the axial and RH rising/downtake of hole axially is 10 °～90 °.
Described hole internal diameter is 1～30mm.
Compared with prior art, the invention has the beneficial effects as follows: 1) inclusion removal efficient is high, and it is tiny that the bubble of generation and slag drip size, and small being mingled with in the steel can be effectively removed in the distribution disperse, significantly strengthens the removal efficient of inclusion; 2) be particularly advantageous in small Al in the removal steel
2O
3Be mingled with, slow down tundish submerged nozzle latch up phenomenon; 3) can total oxygen in the steel be controlled to 3～15ppm, the equivalent diameter of inclusion is controlled to be 0.5～10 μ m, and the inclusion average area is controlled at 0.001～0.008%; 4) operation is simple, and cost is low.
Description of drawings
Fig. 1 is the blowing device hole routine structural representation that distributes;
Fig. 2 is blowing device hole routine two structural representations that distribute;
Fig. 3 is blowing device hole routine three structural representations that distribute;
Fig. 4 is blowing device hole routine four structural representations that distribute;
Fig. 5 is blowing device hole routine five structural representations that distribute;
Among the figure: 1-RH downtake 2-hole 3-jet pipe 4-Vakuumkammer outer wall 5-pipe interface 6-RH upcast
Embodiment
Below in conjunction with accompanying drawing specific embodiment of the present invention is described further:
See Fig. 1, in RH downtake 1 lower boreholes, hole 2 quantity are one; Hole is along the vertical arranged distribution of downtake direction, and hole 2 positions import jet pipe 3 apart from RH downtake 1 lower edge 300mm; Jet pipe 3 stretches out, and is fixed on the Vakuumkammer outer wall 4, and epitaxial part is reserved pipe interface 5; Pipe interface 5 is connected with outsourcing powder feeding equipment, and hole 2 and powder feeding pipeline internal diameter are 7mm, and the axial and RH downtake 1 of hole 2 axially is 45 ° of angles.
Its process of removing fine foreign matter in the steel is following:
Adopt outsourcing powder feeding equipment, finish the clean circulation time in back at deoxidation alloying (adopting the Si deoxidation) and spray into CaCO
3Pulvis 100kg, the winding-up time is 4～5min, and the size range of pulvis is 0～3mm (but not comprising 0), uses rare gas element Ar as carrier, and gas flow is 200L/min, and supply gas pressure is 6.0 standard atmospheric pressures.CaCO
3After pulvis gets into molten steel, decompose the CO that produces a large amount of small disperses
2Bubble is removed tiny being mingled with, and the T [O] of strand was 8ppm after process RH downtake dusted and handles, and adopting the T [O] of conventional processing strand is 14ppm, and effect is remarkable.
See Fig. 2, in RH upcast 6 lower boreholes, hole 2 quantity are two, and hole is along the upcast radial distribution, and hole 2 positions are apart from RH upcast 6 lower edge 300mm, and the axial and RH upcast 6 of hole 2 axially is 45 ° of angles.Import jet pipe 3 in the hole 2, jet pipe 3 stretches out, and is fixed on the Vakuumkammer outer wall 4, and epitaxial part is reserved pipe interface 5, and pipe interface 5 is connected with outsourcing powder feeding equipment, and hole 2 and powder feeding pipeline internal diameter are 7mm.
Its process of removing fine foreign matter in the steel is following:
Adopt outsourcing powder feeding equipment, finish the clean circulation time in back at deoxidation alloying (adopting the Al deoxidation) and spray into CaCO
3Pulvis 160kg, the winding-up time is 4～5min, and the size range of pulvis is 0～3mm (but not comprising 0), uses rare gas element Ar as carrier, and the single tube gas flow is 200L/min, and supply gas pressure is 6.0atm.CaCO
3After pulvis gets into molten steel, decompose the CO that produces a large amount of small disperses
2Bubble is removed tiny being mingled with.The T [O] of strand was 11ppm after process RH dusted and handles, and adopting the T [O] of conventional processing strand is 16ppm, and effect is remarkable.
See Fig. 3, in RH downtake 1 lower boreholes, hole 2 quantity are 1; Hole location imports jet pipe 3 apart from RH downtake lower edge 300mm in the hole 2, jet pipe 3 stretches out; Be fixed on the Vakuumkammer outer wall 4, epitaxial part is reserved pipe interface 5, and pipe interface 5 is connected with outsourcing powder feeding equipment; Hole 2 and powder feeding pipeline internal diameter are 7mm, and the axial and RH downtake of hole 2 axially is 45 ° of angles.
Its process of removing fine foreign matter in the steel is following:
Adopt outsourcing powder feeding equipment, finish the clean circulation time in back at deoxidation alloying (adopting the Al deoxidation) and spray into CaCO
3Pulvis 150kg, the winding-up time is 6～7min, and the size range of pulvis is 0～3mm (but not comprising 0), uses rare gas element Ar as carrier, and gas flow is 150L/min, and supply gas pressure is 5.0atm.CaCO
3After pulvis gets into molten steel, decompose the CO that produces a large amount of small disperses
2Bubble is removed tiny being mingled with.The T [O] of strand was 7ppm after process RH downtake dusted and handles, and adopting the T [O] of conventional processing strand is 15ppm, and effect is remarkable.
See Fig. 4, in RH upcast 6 lower boreholes, hole 2 quantity are 1; Hole 2 positions import jet pipe 3 apart from RH upcast 6 lower edge 300mm, and jet pipe 3 stretches out; Be fixed on the Vakuumkammer outer wall 4, epitaxial part is reserved pipe interface 5, and pipe interface 5 is connected with outsourcing powder feeding equipment; Hole 2 and powder feeding pipeline internal diameter are 7mm, and the axial and RH upcast of hole 2 axially is 45 ° of angles.
Its process of removing fine foreign matter in the steel is following:
Adopt outsourcing powder feeding equipment, finish the clean circulation time in back at deoxidation alloying (adopting the Al deoxidation) and spray into CaCO
3+ MgCO
3Pulvis 150kg, two kinds of pulvis mass ratioes are 1: 1, and the winding-up time is 6～7min, and the size range of pulvis is 0～3mm (but not comprising 0), uses rare gas element Ar as carrier, and gas flow is 200L/min, supply gas pressure is 5.0atm.CaCO
3+ MgCO
3After pulvis gets into molten steel, decompose the CO that produces a large amount of small disperses
2Bubble is removed tiny being mingled with.The T [O] of strand was 9ppm after process RH dusted and handles, and adopting the T [O] of conventional processing strand is 14ppm, and effect is remarkable.
See Fig. 5, in RH downtake 1 lower boreholes, hole 2 quantity are two, and hole is the asymmetric distribution in space along downtake, and hole 2 positions are apart from RH downtake 1 lower edge 300mm, and the axial and RH downtake 1 of hole 2 axially is 45 ° of angles.Import jet pipe 3, jet pipe 3 stretches out, and is fixed on the Vakuumkammer outer wall 4, and epitaxial part is reserved pipe interface 5, and pipe interface 5 is connected with outsourcing powder feeding equipment, and hole 2 and powder feeding pipeline internal diameter are 7mm.
Its process of removing fine foreign matter in the steel is following:
Adopt outsourcing powder feeding equipment, finish the clean circulation time in back at deoxidation alloying (adopting the Al deoxidation) and spray into CaCO
3Pulvis 200kg, the winding-up time is 6～7min, and the size range of pulvis is 0～3mm (but not comprising 0), uses rare gas element Ar as carrier, and the single tube gas flow is 150L/min, and supply gas pressure is 5.0atm.CaCO
3After pulvis gets into molten steel, decompose the CO that produces a large amount of small disperses
2Bubble is removed tiny being mingled with.The T [O] of strand was 8ppm after process RH downtake dusted and handles, and adopting the T [O] of conventional processing strand is 15ppm, and effect is remarkable.
Claims (5)
1. a method of removing fine foreign matter in the molten steel is characterized in that, in the RH refining process, through blowing device in molten steel, jet rare gas element and carbonate pulvis, its operation steps is following:
1) blowing device is connected with source of the gas,, in molten steel, is blown into rare gas element at the molten steel circulation time; Gas flow is 10～500L/min, and pressure is 1.0～15 standard atmospheric pressures, and the small-flow gas that is blown into is under the shock action of decline molten steel; Gas is separated into tiny bubble; Bubble floats in ladle, and the while bumps with inclusion and adheres to, thereby promotes inclusion removal;
2) powder feeding equipment is connected with blowing device, winding-up carbonate pulvis in molten steel, the size range of pulvis is 0～3mm; Rare gas element is as carrier, and gas flow is 10～800L/min, and pressure is 1.0～15 standard atmospheric pressures; The tiny slag of generation at high temperature takes place to decompose and drips and bubble in the carbonate pulvis; Bubble and slag drip in the floating-upward process and bump, adhere to inclusion, thereby remove inclusion, and bubble and slag drip the big I of size through regulating the size control of carbonate pulvis.
2. the described blowing device of claim 1 comprises RH rising/downtake, it is characterized in that, in RH rising/downtake bottom hole is set, and hole passes RH Vakuumkammer outer wall through jet pipe and is connected with pipe interface.
3. blowing device according to claim 2; It is characterized in that; Described hole location is apart from RH rising/downtake lower edge 100～300mm, and hole also can be along downtake radial distribution or shape distribution or the asymmetric distribution in space in the shape of a spiral along the vertical arranged distribution of downtake direction.
4. according to claim 2 or 3 described blowing devices, it is characterized in that described pore quantity is 1～10, the axial and RH rising/decline tubular axis of hole is 10 °～90 °.
5. blowing device according to claim 4 is characterized in that, described hole internal diameter is 1～30mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010584905XA CN102560002A (en) | 2010-12-11 | 2010-12-11 | Method for removing fine impurities of molten steel and blowing device adopted by the method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010584905XA CN102560002A (en) | 2010-12-11 | 2010-12-11 | Method for removing fine impurities of molten steel and blowing device adopted by the method |
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| CN102560002A true CN102560002A (en) | 2012-07-11 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104513881A (en) * | 2014-12-18 | 2015-04-15 | 本钢板材股份有限公司 | Rising pipe arranged between steel ladle and vacuum chamber |
| 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 |
| CN108396109A (en) * | 2017-02-05 | 2018-08-14 | 鞍钢股份有限公司 | A method of generating disperse bubble in ladle molten steel |
| CN112111625A (en) * | 2020-09-07 | 2020-12-22 | 钢铁研究总院 | RH vacuum powder injection refining device and powder injection method thereof |
| CN114854937A (en) * | 2022-05-18 | 2022-08-05 | 昆明理工大学 | Method for reducing non-metallic inclusions in metallurgy |
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| CN1126497A (en) * | 1993-06-04 | 1996-07-10 | 新日本制铁株式会社 | Method of manufacturing low carbon molten steel by vacuum degasification and decarbonization |
| CN101824511A (en) * | 2010-02-05 | 2010-09-08 | 鞍钢股份有限公司 | RH injection refining device and application thereof |
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2010
- 2010-12-11 CN CN201010584905XA patent/CN102560002A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1126497A (en) * | 1993-06-04 | 1996-07-10 | 新日本制铁株式会社 | Method of manufacturing low carbon molten steel by vacuum degasification and decarbonization |
| CN101824511A (en) * | 2010-02-05 | 2010-09-08 | 鞍钢股份有限公司 | RH injection refining device and application thereof |
Non-Patent Citations (1)
| Title |
|---|
| 温丽娟 等: "钢液RH精炼过程中的喷粉脱硫", 《上海金属》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104513881A (en) * | 2014-12-18 | 2015-04-15 | 本钢板材股份有限公司 | Rising pipe arranged between steel ladle and vacuum chamber |
| 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 |
| CN108396109A (en) * | 2017-02-05 | 2018-08-14 | 鞍钢股份有限公司 | A method of generating disperse bubble in ladle molten steel |
| CN112111625A (en) * | 2020-09-07 | 2020-12-22 | 钢铁研究总院 | RH vacuum powder injection refining device and powder injection method thereof |
| CN112111625B (en) * | 2020-09-07 | 2021-08-03 | 钢铁研究总院 | RH vacuum powder injection refining device and powder injection method thereof |
| CN114854937A (en) * | 2022-05-18 | 2022-08-05 | 昆明理工大学 | Method for reducing non-metallic inclusions in metallurgy |
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Application publication date: 20120711 |