CN102151811B - Method for capturing continuous casting inclusion and novel submersed nozzle - Google Patents
Method for capturing continuous casting inclusion and novel submersed nozzle Download PDFInfo
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- CN102151811B CN102151811B CN 201110056701 CN201110056701A CN102151811B CN 102151811 B CN102151811 B CN 102151811B CN 201110056701 CN201110056701 CN 201110056701 CN 201110056701 A CN201110056701 A CN 201110056701A CN 102151811 B CN102151811 B CN 102151811B
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Abstract
The invention relates to the field of metal solidification and continuous casting, in particular to a method for capturing continuous casting inclusion and a novel submersed nozzle. The novel submersed nozzle (1) with a function of capturing the continuous casting inclusion consists of an upper part and a lower part, namely a submersed nozzle upper part (2) and a submersed nozzle lower part (3); the submersed nozzle upper part (2) is provided with a submersed nozzle side outlet hole (5) which has a conventional molten steel guidance function; the submersed nozzle upper part (2) is provided with the submersed nozzle lower part (3) which is tightly connected with the submersed nozzle upper part (2) and has an inclusion capturing function, so that the inclusion on in the rotary molten steel is captured by the submersed nozzle lower part (3) and gathers on the outer surface of the lower part of the submersed nozzle lower part (3) and the function of effectively removing the inclusion from the molten steel is realized. The novel submersed nozzle has long service life, and can effectively remove the inclusion from the molten steel, improve the casting blank quality, and prolong the service life of a crystallizer.
Description
Technical field
The present invention relates to solidifying and the continuous casting field of metal, particularly a kind of method and submersed nozzle thereof of catching the continuous casting field trash.
Background technology
Along with the continuous progress of metallurgical technology, the national economic development is more and more higher to the requirement in high strength, high tenacity and the service life of steel products.Particularly automobile, high-speed train, steel cable bridge etc. are to the steel requirement raising of fatigue life, control to field trash in steel is more and more stricter, the total amount of steel inclusion (usually representing with total oxygen content) reduces to several ppm by tens ppm in past, tens ppm, and service life and the security performance of steel are improved.
At present, in Steel Production Flow Chart, the removal of field trash mainly relies on ladle refining to complete, as stir by ladle argon-blown, LF refining furnace, vacuum refining furnace etc. effectively remove deoxidation products and field trash in steel.In the process of molten steel from large bag to tundish subsequently, be all generally the process of polluting that increases, therefore carrying out rational tundish design is also an importance of removal of inclusions.After molten steel enters crystallizer, effectively remove the field trash in molten steel in mold, be last link that reduces the steel inclusion total amount.In existing technology, removal of inclusions in the molten steel in crystallizer is all generally to design to complete by optimizing submersed nozzle.Submersed nozzle after optimal design can effectively promote the floating of inclusion content in melting steel, and is coated over covering slag absorption, the removal on molten steel surface.
Chinese utility model patent ZL03211455.9(publication number CN2607214Y) a kind of ' immersed nozzle for continuous casting mould ' disclosed, it is continuous casting blooms porous submersed nozzle, its objective is by the design of portalling of the mouth of a river side of difformity and angle, to reach the kinetic energy that slows down mouth of a river beam and beam to the impact of crystallizer wall, when improving crystallizer service life, the disturbance of minimizing to the Mold face, effectively promotes inclusion floating at stable crystalline device flow field.
China design patent ZL03351513.1(publication number CN3383817) provide the appearance design of a kind of ' submersed nozzle '.The general submersed nozzle of the Design and Features of above-mentioned two kinds of submersed nozzles and present smelter is identical, be all generally by the shape design that submersed nozzle and mouth of a river side are portalled reach molten steel importing, reduce liquid surface fluctuation, promote the effects such as inclusion floating.Therefore, the bottom at this class mouth of a river is all generally flat, and the distance of bottom, the mouth of a river bottom portalling to mouth of a river side is shorter, is generally 30-60mm.Shorter mouth of a river bottom design just plays the effect of structure and support.
In existing submersed nozzle device, submersed nozzle itself is sticked with the ability of removal of inclusions consider to consider not or not.
Summary of the invention
The purpose of this invention is to provide a kind of method and submersed nozzle thereof of catching the continuous casting field trash.For achieving the above object, the invention provides following technical scheme:
A first aspect of the present invention, be to provide a kind of method of catching the continuous casting field trash: use one to have the submersed nozzle (1) of catching continuous casting field trash function, this submersed nozzle is comprised of up and down two parts: top, the mouth of a river (2) have mouth of a river side to portal (5), have conventional molten steel diversion function; Top, the mouth of a river (2) increases a bottom, the mouth of a river (3) that closely is connected, this bottom, mouth of a river (3) has the field trash of catching function, make the field trash in the rotation molten steel be caught and be gathered in the outer surface (9) of bottom, the mouth of a river (3) by bottom, the mouth of a river (3), play the effect of effectively removing to remove in molten steel field trash.
L/h=2.5-15 in submersed nozzle, wherein h is that mouth of a river side is portalled the lower edge of (5) to the distance of (7) lower along the line of top, the mouth of a river (2), L is that lower (7) along the line on top, the mouth of a river (2) are to the length of lower end, bottom, the mouth of a river (3).
Outer surface in bottom, the mouth of a river (3) applies the coating that contains calcium oxide, and the aluminium oxide, the silica that are used for the absorption molten steel are mingled with, and form the duplex impurity of calcium oxide and aluminium oxide, calcium oxide and silica.
The described coating that contains calcium oxide is that thickness 1-3mm, material are that calcium oxide or calcium oxide add the coating that magnesia or calcium oxide add silica.
A second aspect of the present invention is to provide a kind of submersed nozzle (1) with catching continuous casting field trash function, and it is comprised of up and down two parts: top, the mouth of a river (2) have mouth of a river side to portal (5), have conventional molten steel diversion function; Top, the mouth of a river (2) increases a bottom, the mouth of a river (3) that closely is connected, this bottom, mouth of a river (3) has the field trash of catching function, make the field trash in the rotation molten steel be caught and be gathered in the outer surface (9) of bottom, the mouth of a river (3) by bottom, the mouth of a river (3), play the effect of effectively removing to remove in molten steel field trash.
L/h=2.5-15 in submersed nozzle, wherein h is that mouth of a river side is portalled the lower edge of (5) to lower along the line 7 the distance of top, the mouth of a river (2), L is that lower (7) along the line on top, the mouth of a river (2) are to the length of lower end, bottom, the mouth of a river (3).
Top, the mouth of a river (2) is connected 3 with bottom, the mouth of a river) be the combined type of a monoblock type or both connections; Both materials are identical or different.
Top, the mouth of a river (2) is be fixedly connected with or removably connect with being connected of bottom, the mouth of a river (3).
Bottom, the mouth of a river (3) is the column identical with top, the mouth of a river (2) or up big and down small platform shape.
The bottom of bottom, the mouth of a river (3) is the hollow-core construction (8) of indent.
The outer surface (9) of bottom, the mouth of a river (3) is smooth or bulk or the channel form of band projection.
In use, it is that to keep the molten steel side at the mouth of a river the portal upper edge of (5) be 50-150mm to the distance H of liquid steel level (6) that submersed nozzle (1) inserts the degree of depth in molten steel, and L is 50-300mm, and h is 20-80mm.
In top, the mouth of a river (2) mouth of a river side portal (5) be two or more; Overlook on direction, mouth of a river side is portalled, and become value with the center line at the mouth of a river be the angle α of 0-35 ° for the center line of (5); In vertical direction, mouth of a river side is portalled, and become value with horizontal line be the angle β of 0-30 ° for the center line of (5).
The material on top, the mouth of a river (2) is a kind of in aluminium-carbonaceous, aluminum-zirconium-carbon matter, magnesium-carbonaceous, aluminium-calcareous, vitreous silica matter.
The material of bottom, the mouth of a river (3) is zirconia, calcium oxide, magnesia, aluminium oxide, silica etc., or they two or more combination.
Outer surface coating thickness in bottom, the mouth of a river (3) is that 1-3mm, material are that calcium oxide or calcium oxide add the coating that magnesia or calcium oxide add silica, the aluminium oxide, the silica that are used for the absorption molten steel are mingled with, and form the duplex impurity of calcium oxide and aluminium oxide, calcium oxide and silica.
In the slag line part that contacts with slag with steel, at the anti-erosion ring of the outside at mouth of a river edge cover zirconium matter, zirconium carbonaceous.
In the present invention, reaction mechanism between bottom, the mouth of a river 3 and molten steel are mingled with is, because the field trash in molten steel in mold moves to the center by the turning effort of molten steel on the horizontal cross-section, the aluminium oxide in molten steel, silica etc. are mingled with and are easy to be adsorbed by the basic anhydride of bottom, the mouth of a river 3 such as calcium oxide.During actual industrial was used, the position of M-EMS all was arranged on the middle and lower part of crystallizer, and the fastest zone of namely molten steel rotation is in the crystallizer middle and lower part.Key of the present invention is the length that has increased bottom, the mouth of a river, submersed nozzle can be extend into the strong Rotary District of molten steel like this, increase greatly field trash in the molten steel and the probability of submersed nozzle surface collision, improved the catching machine meeting of submersed nozzle to inclusion content in melting steel; On the other hand, increase probability that mouth of a river lower length can play the field trash that increases in molten steel and submersed nozzle surface collision equally, improve the effect that submersed nozzle is understood the catching machine of inclusion content in melting steel.
Side the portal lower edge of (5) in the existing mouth of a river is very short to the distance of lower (7) along the line of top, the mouth of a river (2), generally also only has 20-80mm, and the side at the mouth of a river goes out the hole site and relatively fixes, and obviously this can be all disadvantageous to the mouth of a river being extend into the strong Rotary District in crystallizer and improving submersed nozzle to the catching machine of inclusion content in melting steel.
Compare with existing submersed nozzle, advantage of the present invention is:
1. extend the length of submersed nozzle bottom, in electromagnetic agitation useful effect zone, improved the field trash built up to the center in molten steel and the collision opportunity of bottom, the mouth of a river;
2. be provided with the field trash acquisition equipment, effectively remove the field trash in molten steel;
3. overlook on direction, the center line that mouth of a river side is portalled and the angled α of the center line at the mouth of a river have improved the action effect of electromagnetic agitation;
4. in vertical direction, the angled β of the center line that mouth of a river side is portalled and horizontal line has improved the thawing ability of molten steel to crystallizer protecting residue, and can prevent the generation of slag;
Submersed nozzle long service life of the present invention can effectively be removed the field trash in molten steel, improves slab quality, and extends the service life of crystallizer.
Description of drawings
Fig. 1 submersed nozzle with catching the field trash function of the present invention;
The all-in-one-piece submersed nozzle that Fig. 2 material is identical;
The knockdown submersed nozzle of Fig. 3 unlike material (compacting or casting forming);
The knockdown submersed nozzle (being threaded) of Fig. 4 unlike material;
The bottom, the mouth of a river of Fig. 5 column, its surface is with the bulk of projection;
The bottom, the mouth of a river of Fig. 6 platform shape, its surface is channel form;
A plurality of mouths of a river of Fig. 7 side goes out the pore structure top view.
Reference numeral
1 submersed nozzle
2 top, the mouths of a river
3 bottom, the mouths of a river
4 crystallizers
5 mouth of a river sides are portalled
6 liquid steel levels
Lower along the line 7 of 7 top, the mouths of a river 2
The hollow-core construction at 83 bottoms, bottom, the mouths of a river
The outer surface at 9 bottom, the mouths of a river 3
The connecting thread of 10 top, the mouths of a river 2 and bottom, the mouth of a river 3
H mouth of a river side 5 the upper edge distance to liquid steel level 6 of portalling
H mouth of a river side is portalled 5 lower edge to lower along the line 7 the distance on top, the mouth of a river 2,20-80mm
α overlooks on direction, the portal angle of center line at 5 center line and the mouth of a river of mouth of a river side
β in vertical direction, mouth of a river side portal 5 center line and horizontal angle
Lower along the line 7 length to 3 lower ends, bottom, the mouth of a river on top, the L mouth of a river 2 are 50-300mm
The specific embodiment
The invention will be further described with reference to the accompanying drawings for the below.
As shown in Figure 1, the submersed nozzle 1 with catching the field trash function of the present invention, it is comprised of up and down two parts, the submersed nozzle of top, the mouth of a river 2 for having conventional func; The part of bottom, the mouth of a river 3 for growing than conventional submersed nozzle is the field trash acquisition equipment; Top, the mouth of a river 2 closely is connected with bottom, the mouth of a river 3.During use, submersed nozzle is inserted in the interior molten steel of crystallizer 4, molten steel in crystallizer 4 produces rotation under the effect of M-EMS, field trash in molten steel can be built up to the center, with the 3 field trash acquisition equipment collisions of bottom, the mouth of a river, and caught by its institute, be attached on the surface of field trash acquisition equipment, play thus the effect of effectively removing to remove in molten steel field trash.
In course of reaction, what the field trash in molten steel was gathered in that the surface of bottom, the mouth of a river (3) leans on is the rotation that electromagnetic agitation produces the molten steel effect, make the field trash in molten steel assemble to the crystallizer center, the mouth of a river that a plurality of sides are portalled can increase this rotate effect.
Aluminium oxide in molten steel, silica etc. are mingled with and are easy to be adsorbed by basic anhydride such as calcium oxide, form the duplex impurity of calcium oxide and aluminium oxide, calcium oxide and silica.It is the adsorption capacity that aluminium oxide, silica etc. is mingled with in order to improve the mouth of a river that surface, the mouth of a river is coated with calcium oxide coating.But itself does not consume calcium oxide coating.
Cover increasing of collection along with aluminium oxide, silica etc. is mixed in surface, the mouth of a river, these field trashes also will cover the aluminium oxide of collection, continue to cover collection above silica on surface, the mouth of a river.
The top, the mouth of a river 2 of submersed nozzle 1 and bottom, the mouth of a river 3 can be monoblock type (see figure 2)s, can be also the combined types (seeing Fig. 3 or 4) that both connect; Both materials can be identical, also can be different.When upper and lower two parts of submersed nozzle 1 adopt the combined type that both connect, top, the mouth of a river 2 can be adopted with the connected mode of bottom, the mouth of a river 3 and is fixedly connected with, as compressing or casting forming (see figure 3), also can adopt on-fixed to connect, as the (see figure 4) that is threaded.
In order to improve the ability of catching field trash of bottom, the mouth of a river 3 field trash acquisition equipments, different shapes can be made in bottom, the mouth of a river 3, can make the column (see figure 1) identical with top, the mouth of a river 2 as bottom, the mouth of a river 3, also can make up big and down small platform shape (see figure 6); The bottom of bottom, the mouth of a river 3 can also be made hollow-core construction 8(and be seen Fig. 4).The outer surface 9 of bottom, the mouth of a river 3 can be made smooth, also can make block (see figure 5) or the channel form (see figure 6) of band projection.
When more existing submersed nozzles portalled due to employing molten steel vertically downward, the field trash that can build up to the center in molten steel be broken up, and therefore, its molten steel of this submersed nozzle portals and all is arranged on the sidewall at the mouth of a river.Mouth of a river side portals 5 for two or more (see figure 7)s.Overlook on direction, mouth of a river side is portalled, and become value with the center line at the mouth of a river be the angle α of 0-35 ° for 5 center line.Selecting certain angle a, is to portal 5 from mouth of a river side to flow out the molten steel direction of rotation that causes with electromagnetic agitation consistent in order to allow, and the action effect of raising electromagnetic agitation.In vertical direction, mouth of a river side is portalled, and can to become with horizontal line value be the angle β (see figure 3) of 0-30 ° for 5 center line.The setting at β angle is in order to improve molten steel to the thawing ability of crystallizer protecting residue, also will to prevent simultaneously the generation of slag.
Portal 5 lower edge of the mouth of a river side of submersed nozzle 1 is 20-80mm to lower along the line 7 the distance h on top, the mouth of a river 2.
The material on top, the mouth of a river 2 can be aluminium-carbonaceous, aluminum-zirconium-carbon matter, magnesium-carbonaceous, aluminium-calcareous, vitreous silica matter etc.; The material of bottom, the mouth of a river 3 can adopt the identical material with top, the mouth of a river 2, also can adopt zirconia, calcium oxide, magnesia, aluminium oxide, silica etc., or they two or more combination.
Catch the ability of field trash in order to improve submersed nozzle, can be coated with at the outer surface of bottom, the mouth of a river 3 thickness and be 1-3mm, material and be calcium oxide or calcium oxide and add the coating that magnesia or calcium oxide add silica.
In order to improve the service life of submersed nozzle, can partly inlay the anti-erosion ring of cover zirconium matter, zirconium carbonaceous with the slag line that steel contacts with slag in the outside at the mouth of a river.
Claims (16)
1. method of catching the continuous casting field trash, it is characterized in that: use one to have the submersed nozzle (1) of catching continuous casting field trash function, this submersed nozzle is comprised of up and down two parts: top, the mouth of a river (2) have mouth of a river side to portal (5), have conventional molten steel diversion function; Top, the mouth of a river (2) increases a bottom, the mouth of a river (3) that closely is connected, the outer surface of this bottom, mouth of a river (3) applies the coating that contains calcium oxide, the aluminium oxide, the silica that are used for the absorption molten steel are mingled with, form the duplex impurity of calcium oxide and aluminium oxide, calcium oxide and silica, has the field trash of catching function, make the field trash in the rotation molten steel be caught and be gathered in the outer surface (9) of bottom, the mouth of a river (3) by bottom, the mouth of a river (3), play the effect of effective removal inclusion content in melting steel.
2. the method for claim 1, it is characterized in that: L/h=2.5-15 in described submersed nozzle, wherein h is that mouth of a river side is portalled the lower edge of (5) to the distance of (7) lower along the line of top, the mouth of a river (2), and L is that lower (7) along the line on top, the mouth of a river (2) are to the length of lower end, bottom, the mouth of a river (3).
3. the method for claim 1 is characterized in that: the described coating that contains calcium oxide is that thickness 1-3mm, material are that calcium oxide or calcium oxide add the coating that magnesia or calcium oxide add silica.
4. one kind with the submersed nozzle of catching continuous casting field trash function (1), and it is comprised of up and down two parts, it is characterized in that: top, the mouth of a river (2) have mouth of a river side to portal (5), have conventional molten steel diversion function; Top, the mouth of a river (2) increases a bottom, the mouth of a river (3) that closely is connected, the outer surface of this bottom, mouth of a river (3) applies the coating that contains calcium oxide, the aluminium oxide, the silica that are used for the absorption molten steel are mingled with, form the duplex impurity of calcium oxide and aluminium oxide, calcium oxide and silica, has the field trash of catching function, make the field trash in the rotation molten steel be caught and be gathered in the outer surface (9) of bottom, the mouth of a river (3) by bottom, the mouth of a river (3), play the effect of effective removal inclusion content in melting steel.
5. submersed nozzle as claimed in claim 4 (1), it is characterized in that: L/h=2.5-15 in described submersed nozzle, wherein h is that mouth of a river side is portalled the lower edge of (5) to the distance of (7) lower along the line of top, the mouth of a river (2), and L is that lower (7) along the line on top, the mouth of a river (2) are to the length of lower end, bottom, the mouth of a river (3).
6. submersed nozzle as claimed in claim 4 (1), it is characterized in that: top, the mouth of a river (2) are connected 3 with bottom, the mouth of a river) be a monoblock type or combined type that both connect; Both materials are identical or different.
7. submersed nozzle as claimed in claim 4 (1), it is characterized in that: top, the mouth of a river (2) are be fixedly connected with or removably connect with being connected of bottom, the mouth of a river (3).
8. submersed nozzle as claimed in claim 4 (1), it is characterized in that: bottom, the mouth of a river (3) are the columns identical with top, the mouth of a river (2), or bottom, the mouth of a river (3) are up big and down small platform shapes.
9. submersed nozzle as claimed in claim 4 (1), it is characterized in that: the bottom of bottom, the mouth of a river (3) is the hollow-core construction (8) of indent.
10. submersed nozzle as described in claim 1 or 4 (1) is characterized in that: the outer surface (9) of bottom, the mouth of a river (3) is smooth or bulk or the channel form of band projection.
11. submersed nozzle as claimed in claim 5 (1), it is characterized in that: in use, it is that to keep the mouth of a river side at the mouth of a river the portal upper edge of (5) be 50-150mm to the distance H of liquid steel level (6) that submersed nozzle (1) inserts the degree of depth in molten steel, L is 50-300mm, and h is 20-80mm.
12. submersed nozzle as claimed in claim 4 (1) is characterized in that: in top, the mouth of a river (2) mouth of a river side portal (5) be two or more; In vertical direction, mouth of a river side is portalled, and become value with horizontal line be the angle β of 0-30 ° for the center line of (5).
13. submersed nozzle as claimed in claim 4 (1) is characterized in that: the material of top, the mouth of a river (2) is a kind of in aluminium-carbonaceous, aluminum-zirconium-carbon matter, magnesium-carbonaceous, aluminium-calcareous, vitreous silica matter.
14. submersed nozzle as claimed in claim 4 (1) is characterized in that: the material of bottom, the mouth of a river (3) is zirconia, calcium oxide, magnesia, aluminium oxide, silica, or they two or more combination.
15. according to submersed nozzle claimed in claim 4 (1), it is characterized in that: the outer surface coating thickness in bottom, the mouth of a river (3) is that 1-3mm, material are that calcium oxide or calcium oxide add the coating that magnesia or calcium oxide add silica, the aluminium oxide, the silica that are used for the absorption molten steel are mingled with, and form the duplex impurity of calcium oxide and aluminium oxide, calcium oxide and silica.
16. submersed nozzle as claimed in claim 4 (1) is characterized in that: in the slag line part that contacts with slag with steel, at the anti-erosion ring of the outside at mouth of a river edge cover zirconium matter, zirconium carbonaceous.
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| CN104084551A (en) * | 2014-07-30 | 2014-10-08 | 攀钢集团攀枝花钢钒有限公司 | Method for controlling continuous casting tundish submersed nozzle |
| CN104801684B (en) * | 2015-05-12 | 2017-02-22 | 安徽工业大学 | Lifting type system for inhibiting fluctuating of liquid level of crystallizer at high drawing speed |
| CN106493347B (en) * | 2016-10-25 | 2018-07-06 | 华北理工大学 | Continuous casting tundish quick-change nozzle and the method with its dross inclusion adsorption |
| CN110315061B (en) * | 2018-03-30 | 2021-10-19 | 宝山钢铁股份有限公司 | Can prevent mouth of a river of pipeline and spit hole bottom adhesion |
| CN112024865B (en) * | 2020-11-03 | 2021-02-02 | 北京科技大学 | Stopper rod, tundish and method for removing inclusions in liquid metal |
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| CN101357400A (en) * | 2007-08-05 | 2009-02-04 | 边仁杰 | Manufacture method of hole-setting partition wall |
| EP2092998A1 (en) * | 2006-12-05 | 2009-08-26 | Nippon Steel Corporation | Molten metal continuous casting method |
| KR20100046983A (en) * | 2008-10-28 | 2010-05-07 | 현대제철 주식회사 | Submerged nozzle for continuous casting |
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| JPH01262055A (en) * | 1988-04-13 | 1989-10-18 | Sumitomo Metal Ind Ltd | Continuous casting method |
| TW362053B (en) * | 1996-07-09 | 1999-06-21 | Baker Refractories | Nozzle co-molded with slagline sleeve, method for marking the same, and slagline sleeve composition |
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| EP2092998A1 (en) * | 2006-12-05 | 2009-08-26 | Nippon Steel Corporation | Molten metal continuous casting method |
| CN101357400A (en) * | 2007-08-05 | 2009-02-04 | 边仁杰 | Manufacture method of hole-setting partition wall |
| KR20100046983A (en) * | 2008-10-28 | 2010-05-07 | 현대제철 주식회사 | Submerged nozzle for continuous casting |
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Effective date of registration: 20170111 Address after: 100081 Haidian District Institute of South Road, Beijing, No. 76 Patentee after: Zhongda Lianzhu Technology National Engineering Research Center Co., Ltd. Address before: 100081 Haidian District Institute of South Road, Beijing, No. 76 Patentee before: Iron &. Steel Research General Inst. Patentee before: Zhongda Lianzhu Technology National Engineering Research Center Co., Ltd. |