CN102019386A - Control method for accurately adding trace elements to steels - Google Patents
Control method for accurately adding trace elements to steels Download PDFInfo
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- CN102019386A CN102019386A CN2009101874581A CN200910187458A CN102019386A CN 102019386 A CN102019386 A CN 102019386A CN 2009101874581 A CN2009101874581 A CN 2009101874581A CN 200910187458 A CN200910187458 A CN 200910187458A CN 102019386 A CN102019386 A CN 102019386A
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Abstract
The invention provides a control method for accurately adding trace elements to steels. The control method is characterized in that the wall of the upper part of a long nozzle for pouring basket metallurgy is provided with a through hole with an axial direction at an angle of 10-90 degrees with the axial direction of the upper part of the long nozzle; the through hole is connected with a gas source through a connector connected with an external delivery pipe; powder delivery equipment jets various alloy powder materials, rare earth powder and various beneficial additives contained in the steels to liquid steel through the external delivery pipe and the long nozzle during continuous steel casting; powder granularity is 0.05-3mm; a used carrier is an inert gas Ar or N2; gas flow rate is 3-500L/minute; and gas pressure is 1.0-12atm. The invention can be used for outstandingly enhancing the stable and effective recovery rate of the trace elements in the steels; trace alloying elements have high hit rate and uniform components; and in addition, the invention can enhance the stable yield of the trace alloying elements, reduce the consumption quantity of the trace elements, save the cost and enhance the property of the steels.
Description
Technical field
The invention belongs to technical field of ferrous metallurgy, relate to the tundish metallurgy technology, relate in particular to a kind of method that in steel, accurately adds trace element.
Background technology
Along with further developing of steel and iron industry, the exploitation of design of the material of steel and application technology has brought great challenge to metallurgical industry.Steel products will develop according to molten steel cleanness height, Composition Control precision height and the high direction of properties of product stability.The method that element that in the steel some are active such as rare earth, calcium, magnesium etc. add molten steel requires very high.This mainly be because: (1) these element burning-points are low, easily oxidation, easy firing at high temperature is easy to before not entering molten steel as yet i.e. combustible loss in air in steel-making and casting process; (2) chemism of rare earth element is strong, when contacting with slag easily with slag in the oxide component interaction, self is oxidized and enter in the slag; (3) entered the product that effect backs such as the active element of molten steel and the sulphur in the steel generate, or melt active metal element in molten steel, when contacting with slag, refractory material or have an opportunity to contact with air, the capital reoxidizes thing reaction, makes sulphur get back in the steel rare earth element itself and then constantly becomes oxide again and enter slag.Until approach exhaustion.Continuous cast mold line feeding technology has alloying element recovery rate height.Advantages such as control is stable.But adopt this method to add elements such as rare earth, calcium, magnesium and also have following shortcoming: (1) joining day is slow.Alloying element is not free fully diffusion in crystallizer, skewness.(2) this method has a limiting value requirement to the continuous casting billet minimum thickness, and the application on middle slab will produce defective and cause steel plate to be scrapped.Therefore, the accurate adding control technology of micronutrient levels such as boron, rare earth, calcium, magnesium just has important and practical meanings in the research steel.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of control method that accurately adds trace alloying element in the tundish metallurgy process in steel is provided.
The present invention is achieved in that and guaranteeing under the principle that molten steel passes through, on the wall of tundish metallurgy, offer with long nozzle top its axially and mouth of a river upper axial be 10 °～90 ° through hole.This through hole is connected with source of the gas by the joint that links to each other with outer carrier pipe, when continuous-casting steel pouring, adopt powder feeding equipment by outer carrier pipe and the long nozzle useful additive in various alloy powders, rare earth powder and the various steel of in molten steel, jetting, powder granularity is 0.05～3mm, and used carrier is inert gas Ar or N
2, gas flow is 3～500l/min, air pressure is 1.0～12atm.The alloy powder is fusing at once after spraying into long nozzle, and along with the stream thigh pours tundish, alloying elements distribution is even.Because dissolved oxygen content is low in the molten steel, and there is not any oxide isolation in the adition process of alloying element, alloying element recovery rate height.
The quantity of through hole of the present invention can be 1～10, and the position of through hole is apart from long nozzle top 35～700mm.Described through hole is made up of inside and outside two holes, and the hole diameter that is positioned at the long nozzle inwall is 1～30mm, and length is 0～20mm; The hole diameter that is positioned at the long nozzle outer wall is 5～30mm.Through hole can be along the vertical arranged distribution of long nozzle direction, also can along the long nozzle radial distribution or in the shape of a spiral shape distribute, even can also the asymmetric distribution in space, promptly arrange arbitrarily.
The front portion of joint of the present invention is thinner, its external diameter 5～30mm, and internal diameter 1～26mm, the rear portion of joint is thicker, and links to each other with outer carrier pipe.Outer carrier pipe of the present invention is a metal hose.The front portion of joint is passed in the outer wall hole that the joint base is plugged on through hole, and the joint base connects a clip, and both are overall structure, and clip is by on the outer wall that is bolted to long nozzle.
Because long nozzle is presented thick fine texture down, so the present invention is equipped with the fire-resistant asbestos washer of wedge shape between the bottom of described joint base and long nozzle outer wall.The present invention also scribbles high temperature resistant binder on the faying face of described joint and through hole.
Technology of the present invention is simple, flexible, convenient, easy operating; Adopt the present invention can significantly improve trace element stable and effective rate of recovery in steel, trace alloying element shoots straight, uniform ingredients; The alloying element that adds has been avoided oxidation, can realize in the molten steel that alloying element accurately adds hit rate between ± 10ppm, greatly improved the stable recovery rate of alloying element, can guarantee micro-total amount and solid solution capacity required in the steel comparatively accurately, thereby the stable steel performance that improves satisfies user's instructions for use; Because trace element is the raising (exceeding 30%～80% than existing method) of recovery rate effectively, can reduce ton consumption of steel trace element, save cost.
Description of drawings
Accompanying drawing 1 is the structural representation of tundish metallurgy of the present invention with long nozzle.
1 is the long nozzle wall among the figure, and 2 is through hole, and 3 is pad, and 4 is the joint base, and 5 is joint, and 6 is outer carrier pipe (metal hose), and 7 is clip.
Accompanying drawing 2 is the partial enlarged drawing of accompanying drawing 1.
Accompanying drawing 3 is the structural representation of clip and base.
The specific 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.
Embodiment 1
The present embodiment tundish metallurgy distance mouth of a river, the position top 200mm of the through hole 2 of long nozzle, the quantity of through hole 2 is 4, along the long nozzle radial distribution, angle is 90 ° between 4 through holes 2.The hole diameter that is positioned at the long nozzle inwall is 8mm, and length is 12mm, and the hole diameter that is positioned at the long nozzle outer wall is 16mm, and the axial and long nozzle upper axial of through hole 2 is 60 ° of angles, and the diameter of joint 5 front portions is 16mm, and internal diameter is 8mm.
Use two stream slab casters, the section of strand is 1150 * 230mm, and pulling rate is 1.1m/min.Adopt powder feeding equipment to spray into Fe-50%Re alloy powder by metal hose 6 and long nozzle, the particle size range of powder is 0.5～2.0mm, and conveying gas is nitrogen, and supply gas pressure is 4.5atm, and flow is 150l/min.Powder melts rapidly and, homogenising fully discrete by the stream thigh in the long nozzle after entering long nozzle.From the strand assay as can be known, the recovery rate of rare earth element is 90%.
Embodiment 2
The present embodiment tundish metallurgy distance mouth of a river, the position top 550mm of the through hole 2 of long nozzle, the quantity of through hole 2 is 1.The hole diameter that is positioned at the long nozzle inwall is 10mm, and length is 10mm, and the hole diameter that is positioned at the long nozzle outer wall is 20mm, and the axial and top long nozzle of through hole 2 axially is 20 ° of angles, and the external diameter of joint 5 front portions is 20mm, and internal diameter is 10mm.
Use two stream slab casters, the section of strand is 1150 * 230mm, and pulling rate is 1.1m/min.Adopt powder feeding equipment to spray into Fe-25%B alloy powder by metal hose 6 and long nozzle, the particle size range of powder is 0.5～3.0mm, and supply gas pressure is 3atm, and flow is 50l/min, and conveying gas is argon gas.Powder melts rapidly and, homogenising fully discrete by the stream thigh in the long nozzle after entering long nozzle.From the strand assay as can be known, the recovery rate of B element is 95%.
Embodiment 3
The present embodiment tundish metallurgy distance mouth of a river, the position top 700mm of the through hole 2 of long nozzle, the quantity of through hole 2 is 1.The hole diameter that is positioned at the long nozzle inwall is 5mm, and length is 10mm, and the hole diameter that is positioned at the long nozzle outer wall is 30mm, and the axial and top long nozzle of through hole 2 axially is 40 ° of angles, and the external diameter of joint 5 front portions is 30mm, and internal diameter is 16mm.
Use two stream slab casters, the section of strand is 1150 * 230mm, and pulling rate is 1.1m/min.Adopt powder feeding equipment to spray into Fe-25%Ca alloy powder by metal hose 6 and long nozzle, the particle size range of powder is 0.5～2.0mm, and supply gas pressure is 3atm, and flow is 30l/min, and conveying gas is argon gas.Powder melts rapidly and, homogenising fully discrete by the stream thigh in the long nozzle after entering long nozzle.From the strand assay as can be known, the recovery rate of Ca element is 30%.
Embodiment 4
The present embodiment tundish metallurgy is 10 with the quantity of long nozzle through hole 2, being the spatially spiral shape along long nozzle distributes, each through hole 2 along continuous straight runs differs 36 °, spacing along long nozzle direction through hole 2 is about 66.5mm, the distance mouth of a river, the position top 35mm of uppermost through hole 2, through hole 2 bottom is apart from top, mouth of a river 700mm.The hole diameter that is positioned at the long nozzle inwall is 8mm, and length is 12mm, and the hole diameter that is positioned at the long nozzle outer wall is 20mm, and the axial and long nozzle upper axial of through hole 2 is 70 ° of angles, and the external diameter of joint 5 front portions is 20mm, and internal diameter is 16mm.
Use two stream slab casters, the section of strand is 1150 * 230mm, and pulling rate is 1.2m/min.Adopt powder feeding equipment to spray into Si-30%Ca alloy powder by metal hose 6 and long nozzle, the particle size range of powder is 0.5～2.0mm, and supply gas pressure is 9.5atm, and flow is 25l/min, and conveying gas is argon gas.Powder melts rapidly and, homogenising fully discrete by the stream thigh in the long nozzle after entering long nozzle.From the strand assay as can be known, the recovery rate of Ca element is 35%.
Embodiment 5
The present embodiment tundish metallurgy is 10 with the quantity of long nozzle through hole 2, being the spatially spiral shape along long nozzle distributes, each through hole 2 along continuous straight runs differs 36 °, spacing along long nozzle direction through hole 2 is about 55mm, the distance mouth of a river, the position top 150mm of uppermost through hole 2, through hole 2 bottom is apart from top, mouth of a river 700mm.The hole diameter that is positioned at the long nozzle inwall is 8mm, and length is 12mm, and the hole diameter that is positioned at the long nozzle outer wall is 20mm, and the axial and long nozzle upper axial of through hole 2 is 65 ° of angles, and the external diameter of joint 5 front portions is 20mm, and internal diameter is 8mm.
Use two stream slab casters, the section of strand is 1150 * 230mm, and pulling rate is 1.2m/min.Adopt powder feeding equipment to spray into Ni-15%Ca alloy powder by metal hose 6 and long nozzle, the particle size range of powder is 0.5～2.0mm, and supply gas pressure is 2.5atm, and flow is that 150l/min, conveying gas are argon gas.Powder melts rapidly and, homogenising fully discrete by the stream thigh in the long nozzle after entering long nozzle.From the strand assay as can be known, the recovery rate of Ca element is 40%.
Embodiment 6
The present embodiment tundish metallurgy distance mouth of a river, the position top 380mm of the through hole 2 of long nozzle, the quantity of through hole 2 is 1.The hole diameter that is positioned at the long nozzle inwall is 10mm, and length is 10mm, and the hole diameter that is positioned at the long nozzle outer wall is 18mm, and the axial and top long nozzle of through hole 2 axially is 10 ° of angles, and the external diameter of joint 5 front portions is 18mm, and internal diameter is 12mm.
Use two stream slab casters, the section of strand is 1150 * 230mm, and pulling rate is 1.1m/min.Adopt powder feeding equipment to spray into Ni-15%Mg alloy powder by metal hose 6 and long nozzle, the particle size range of powder is 0.5～2.0mm, and supply gas pressure is 3atm, and flow is 10l/min, and conveying gas is argon gas.Powder melts rapidly and, homogenising fully discrete by the stream thigh in the long nozzle after entering long nozzle.From the strand assay as can be known the recovery rate of Mg element be 30%.
Claims (5)
1. the control method that trace element accurately adds in the steel, it is characterized in that on the wall of tundish metallurgy, offering with long nozzle top its axially and mouth of a river upper axial be 10 °～90 ° through hole, and be connected with source of the gas by the joint that links to each other with outer carrier pipe, when continuous-casting steel pouring, adopt powder feeding equipment by outer carrier pipe and the long nozzle useful additive in various alloy powders, rare earth powder and the various steel of in molten steel, jetting, powder granularity is 0.05～3mm, and used carrier is inert gas Ar or N
2, gas flow is 3～500l/min, air pressure is 1.0～12atm.
2. the control method that trace element accurately adds in the steel according to claim 1, the quantity that it is characterized in that described through hole is 1～10, the position of through hole is apart from long nozzle top 35～700mm, described through hole is made up of inside and outside two holes, the hole diameter that is positioned at the long nozzle inwall is 1～30mm, length is 0～20mm, and the hole diameter that is positioned at the long nozzle outer wall is 5～30mm.
3. the control method that trace element accurately adds in the steel according to claim 1 and 2, the front portion that it is characterized in that described joint is thinner, its external diameter 5～30mm, internal diameter 1～26mm, the rear portion of joint is thicker, and links to each other with outer carrier pipe, and the front portion of joint is passed in the outer wall hole that the joint base is plugged on through hole, the joint base connects a clip, and clip is by on the outer wall that is bolted to long nozzle.
4. the control method that trace element accurately adds in the steel according to claim 3 is characterized in that being equipped with taperliner between the bottom of described joint base and long nozzle outer wall, scribbles high temperature resistant binder on the faying face of described joint and through hole.
5. the control method that trace element accurately adds in the steel according to claim 1 and 2 is characterized in that described through hole can be along the vertical arranged distribution of long nozzle direction, or along the long nozzle radial distribution or in the shape of a spiral shape distribute or the asymmetric distribution in space.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101874581A CN102019386A (en) | 2009-09-15 | 2009-09-15 | Control method for accurately adding trace elements to steels |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101874581A CN102019386A (en) | 2009-09-15 | 2009-09-15 | Control method for accurately adding trace elements to steels |
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| CN102019386A true CN102019386A (en) | 2011-04-20 |
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| CN2009101874581A Pending CN102019386A (en) | 2009-09-15 | 2009-09-15 | Control method for accurately adding trace elements to steels |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102794443A (en) * | 2011-05-25 | 2012-11-28 | 通用汽车环球科技运作有限责任公司 | Pour ladle for molten metal |
| CN110252974A (en) * | 2019-07-26 | 2019-09-20 | 东北大学 | A kind of device and method for continuous casting production molten steel component fine tuning and inclusion conditioning |
| CN110744016A (en) * | 2019-10-17 | 2020-02-04 | 东北大学 | Device and method for treating molten steel by utilizing rare earth in tundish |
-
2009
- 2009-09-15 CN CN2009101874581A patent/CN102019386A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102794443A (en) * | 2011-05-25 | 2012-11-28 | 通用汽车环球科技运作有限责任公司 | Pour ladle for molten metal |
| CN102794443B (en) * | 2011-05-25 | 2015-06-17 | 通用汽车环球科技运作有限责任公司 | Pour ladle for molten metal |
| CN110252974A (en) * | 2019-07-26 | 2019-09-20 | 东北大学 | A kind of device and method for continuous casting production molten steel component fine tuning and inclusion conditioning |
| CN110744016A (en) * | 2019-10-17 | 2020-02-04 | 东北大学 | Device and method for treating molten steel by utilizing rare earth in tundish |
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Application publication date: 20110420 |