CN104772452A - Method for preventing steel billet continuous casting nozzle from blocking - Google Patents
Method for preventing steel billet continuous casting nozzle from blocking Download PDFInfo
- Publication number
- CN104772452A CN104772452A CN201510110081.5A CN201510110081A CN104772452A CN 104772452 A CN104772452 A CN 104772452A CN 201510110081 A CN201510110081 A CN 201510110081A CN 104772452 A CN104772452 A CN 104772452A
- Authority
- CN
- China
- Prior art keywords
- mouth
- river
- nozzle
- steel
- blocking
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 38
- 239000010959 steel Substances 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000000903 blocking effect Effects 0.000 title claims abstract description 21
- 238000009749 continuous casting Methods 0.000 title claims abstract description 14
- 239000004020 conductor Substances 0.000 claims abstract description 15
- 230000008569 process Effects 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims description 14
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 7
- 239000004411 aluminium Substances 0.000 claims description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 4
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 4
- 229910052726 zirconium Inorganic materials 0.000 claims description 4
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 229910052580 B4C Inorganic materials 0.000 claims description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 2
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 2
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 2
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 239000011733 molybdenum Substances 0.000 claims description 2
- 229910052750 molybdenum Inorganic materials 0.000 claims description 2
- 229910052697 platinum Inorganic materials 0.000 claims description 2
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 2
- 229910052721 tungsten Inorganic materials 0.000 claims description 2
- 239000010937 tungsten Substances 0.000 claims description 2
- 230000005012 migration Effects 0.000 abstract description 5
- 238000013508 migration Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 3
- 238000005266 casting Methods 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 5
- 230000005684 electric field Effects 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 239000010813 municipal solid waste Substances 0.000 description 3
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- PUAQLLVFLMYYJJ-UHFFFAOYSA-N 2-aminopropiophenone Chemical compound CC(N)C(=O)C1=CC=CC=C1 PUAQLLVFLMYYJJ-UHFFFAOYSA-N 0.000 description 1
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910004261 CaF 2 Inorganic materials 0.000 description 1
- 229910004709 CaSi Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910001200 Ferrotitanium Inorganic materials 0.000 description 1
- 229910000655 Killed steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/52—Manufacturing or repairing thereof
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
Abstract
The invention provides a method for preventing a steel billet continuous casting nozzle from blocking, and belongs to the technical field of continuous casting steel production in metallurgical industry. The method comprises the following steps that the outer surface of the nozzle is connected with the ground or a position with the zero potential by conducting materials, so that the potential of the inner surface of the nozzle is zero, the migration and the adhesion of occluded foreign substances in steel to the inner surface of the nozzle are reduced or eliminated, and the nozzle blockage is prevented. The method has the advantages that by starting from the migration and the adhesion of occluded foreign substances to the inner surface of the nozzle, the problem of continuous casting nozzle blockage is fundamentally solved, and in addition, the implementation process is simple and convenient.
Description
Technical field
The invention belongs to steel billet continuous casting field, be specifically related to a kind of method preventing continuous-casting of steel billet nozzle blocking.
Background technology
What require steel product quality along with people improves constantly, and steel grade nearly all at present all needs external refining, to remove the harmful element in steel.In order to control the free oxygen content in steel, generally to add a large amount of deoxygenated alloys in refining process to carry out deep deoxidation to it, making it to generate corresponding oxide.In these oxides, the floating from molten steel had enters in slag and is removed, but still some can residue in molten steel with the form of oxide inclusions.In casting process, when molten steel from ladle flow through long nozzle enter tundish or by tundish flow through submersed nozzle enter crystallizer time, these oxide inclusions will adhere at mouth of a river inner surface, pile up, and then continous casting sprue is blocked.In addition, Al can be generated after the dissolved aluminum in molten steel and the oxygen dissolved in molten steel react
2o
3and can be attached on the inner surface of the mouth of a river, this is also the major reason causing nozzle blocking.Production practices show, nozzle blocking is relevant with factors such as molten steel composition, method of deoxidation, cast temperature and time, mouth of a river material and shapes.Nozzle blocking is the most serious with aluminum killed steel, high-alloy steel, rare earth steel, titanium steel.The ore deposit phase composition of tamper mainly α-Al by analysis
2o
3and α-Al
2o
3with the mixture of FeO.
Nozzle blocking endangers the biggest factor of continuous casting production process at present.Nozzle blocking pulling rate will be caused to slow down or flow velocity irregular, cause continuous casting operation unstable; Also can cause bias current simultaneously and cause slag, tamper comes off and enters molten steel and will increase foreign substance in molten steel, thus has a strong impact on slab quality, even causes continuous casting discontinuity events.
In order to reduce the continous casting sprue blocking in casting process, research and develop multiple method at present.Mainly contain:
(1) composite nozzle is adopted.At traditional Al
2o
3additional one deck anti-clogging liner inside the-C mouth of a river, the common used material of this anti-clogging liner has: ZrO
2-CaO-C system material, O'sailon-ZrO
2-C system material, Sialon-graphite system material, zirconium mullite-CaF
2be material and Al
2o
3-zirconium mullite-CaO-C system material etc.Its main purpose makes attachment and anti-blocking inner lining material react exactly and generates low-melting compound.
(2) new material is adopted.Adopt the BN Substitute For Partial graphite that interfacial tension is larger, to reduce the wetability of molten steel to the mouth of a river, in minimizing steel, oxide inclusions is in the attachment of mouth of a river inner surface; And adopt ZrO
2-C-ZrB
2be material, ZrO
2-SiO
2-C system material can suppress nozzle blocking equally.
(3) hello silk technology is adopted.Adopt CaSi silk process molten steel, deoxidation products Al can be made
2o
3react with CaO and form low-melting compound, thus prevent deoxidation products to be deposited on mouth of a river inner surface.In crystallizer, add alloy A l, B, Ti by stopper mesopore, can, while meeting alloying component fine setting, avoid blocking the mouth of a river containing aluminium in molten steel.
Improve gate structure, strict control continuous casting operation technique with the exception of this in addition, reduce inclusion content in melting steel quantity and make water nozzle thermal insulation casing with techniques and methods such as the conservative control degrees of superheat.Although develop many continous casting sprue anti-clogging technology, but in actual use, continous casting sprue blocking still frequently occurs, and particularly when pouring into a mould mild steel, continous casting sprue blockage problem is still very serious, illustrates that the technology of above-mentioned exploitation not yet fundamentally solves the problem of nozzle blocking.Why many technology of current exploitation can not fundamentally solve nozzle blocking problem, are that people not yet fully understand the process of nozzle blocking and mechanism.Up to the present, people generally believe that the non-metallic inclusion in molten steel is electroneutral, that is, the field trash in molten steel itself is without any electric charge.
Summary of the invention
In order to solve the blockage problem of continous casting sprue, the present inventor studies rear discovery to the process of nozzle blocking and mechanism, and continous casting sprue inner surface, molten steel and steel inclusion all can be charged because of molten steel and the friction between it.Have electric charge to exist and will produce electric field, steel inclusion also moves to mouth of a river inner surface under the effect of electric field, and discharges at continous casting sprue inner surface and deposit.Based on this, the present invention is the migration feature under electric field action according to the charged characteristic of mouth of a river inner surface, molten steel and steel inclusion and field trash, by using conductive material, the position that mouth of a river outer surface and the earth or current potential are zero is connected, the current potential of mouth of a river inner surface is made to be zero, eliminate steel inclusion to the migration of mouth of a river inner surface and deposition, prevent the blocking of continous casting sprue with this.
The invention provides a kind of method preventing continuous-casting of steel billet nozzle blocking, described method comprises: by one end of conductive material in the forming process of the mouth of a river or the mouth of a river be shaped after and not yet to flood before inoxidzable coating by inlaying, coiling, jig or the mode imbedded be connected with mouth of a river outer surface, the other end of conductive material directly or by wire or cable with greatly or current potential be zero position be connected, to make the current potential of mouth of a river inner surface for zero, wherein, the mouth of a river used is made by electric conductor.
Because nozzle blocking causes because mouth of a river inner surface is charged, therefore, in order to eliminate the current potential of mouth of a river inner surface, need nozzle material to have electric conductivity, the electric conductor making the mouth of a river can by Al
2o
3, SiO
2, ZrO
2, MgO, SiC, Si
3n
4, BN, B
4independent one or more in C and C combine formation, and one or more the material in metal material or zirconia, carborundum, boron carbide, silicon nitride, the zirconium borides etc. such as the conductive material be connected with mouth of a river outer surface is iron, copper, aluminium, molybdenum, tungsten, platinum is formed.
Effect of the present invention is as follows:
(1) Be very effective of prevention of immersed nozzle clogging: mouth of a river outer surface is connected by conductive material with the earth or is connected with the position that current potential is zero, mouth of a river inner surface is made to keep electroneutral, reduce or eliminate the migration of field trash to mouth of a river inner surface, prevention of immersed nozzle clogging;
(2) mouth of a river anti-blockage method is simple and convenient: only mouth of a river outer surface need be connected with the earth or be connected with the position that current potential is zero by conductive material, do not need to do any change to current continuous casting process, therefore, mouth of a river anti-clogging process is simple and convenient, and without the need to extra charge.
Detailed description of the invention
To pour into a mould high aluminium low carbon steel and bearing steel for objective for implementation, the mouth of a river is Al
2o
3-C matter crystallizer submersed nozzle, conductive material is stainless steel wire, before dipping inoxidzable coating, adopt winding mode to be connected with mouth of a river outer surface.Specific embodiment and result as shown in table 1.
The external surface grounded result of implementation in table 1 mouth of a river
Two kinds of results of implementation show: time unearthed, are no matter cast high aluminium low carbon steels, or make-up a bearing steel, and its duration of pouring only has 5-6 hour, and the mouth of a river is external surface grounded after, the water-gap pouring time obviously increases, anti-clogging Be very effective.
Claims (3)
1. one kind prevents the method for continuous-casting of steel billet nozzle blocking, it is characterized in that described method comprises: by one end of conductive material in the forming process of the mouth of a river or after the mouth of a river is shaped and before not flooding inoxidzable coating by inlaying, coiling, jig or the mode imbedded be connected with mouth of a river outer surface, the other end of conductive material directly or by wire or cable with greatly or current potential be zero position be connected, wherein, the described mouth of a river is made up of electric conductor.
2. method according to claim 1, is characterized in that the material of described electric conductor is selected from by Al
2o
3, SiO
2, ZrO
2, MgO, SiC, Si
3n
4, BN, B
4c and C composition group in one or more.
3. method according to claim 1, it is characterized in that described conductive material is selected from the group be made up of iron, copper, aluminium, molybdenum, tungsten, platinum, zirconia, carborundum, boron carbide, silicon nitride and zirconium boride one or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510110081.5A CN104772452B (en) | 2015-03-12 | 2015-03-12 | Method for preventing steel billet continuous casting nozzle from blocking |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510110081.5A CN104772452B (en) | 2015-03-12 | 2015-03-12 | Method for preventing steel billet continuous casting nozzle from blocking |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104772452A true CN104772452A (en) | 2015-07-15 |
| CN104772452B CN104772452B (en) | 2017-05-03 |
Family
ID=53614389
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510110081.5A Expired - Fee Related CN104772452B (en) | 2015-03-12 | 2015-03-12 | Method for preventing steel billet continuous casting nozzle from blocking |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104772452B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112658241A (en) * | 2020-12-10 | 2021-04-16 | 东北大学 | Method for preventing decarburization and reaction behavior of rare earth steel nozzle by applying interface electric field |
| CN114088754A (en) * | 2021-10-20 | 2022-02-25 | 包头钢铁（集团）有限责任公司 | Method for researching composition of attachment matter phase on inner wall of submerged nozzle for casting molten steel with different contents of rare earth |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004268142A (en) * | 2003-02-17 | 2004-09-30 | Jfe Steel Kk | Immersion nozzle for continuous casting of steel |
| CN201008972Y (en) * | 2007-03-27 | 2008-01-23 | 宝山钢铁股份有限公司 | Continuous casting immersed water gap containing conductive ferrule |
| CN101176914A (en) * | 2006-11-10 | 2008-05-14 | 宝山钢铁股份有限公司 | Method for preventing cast steel stove continuous casting water gap from obstruction and reducing erosion |
| CN102133817A (en) * | 2009-11-26 | 2011-07-27 | 精工爱普生株式会社 | Liquid ejecting apparatus |
| CN102517417A (en) * | 2011-12-08 | 2012-06-27 | 辽宁科技大学 | Method for removing and controlling foreign substances in metal and alloy |
| CN103436655A (en) * | 2013-05-23 | 2013-12-11 | 沈阳东大高温材料有限公司 | Method for removing and refining inclusion and bubble from molten metal |
-
2015
- 2015-03-12 CN CN201510110081.5A patent/CN104772452B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004268142A (en) * | 2003-02-17 | 2004-09-30 | Jfe Steel Kk | Immersion nozzle for continuous casting of steel |
| CN101176914A (en) * | 2006-11-10 | 2008-05-14 | 宝山钢铁股份有限公司 | Method for preventing cast steel stove continuous casting water gap from obstruction and reducing erosion |
| CN201008972Y (en) * | 2007-03-27 | 2008-01-23 | 宝山钢铁股份有限公司 | Continuous casting immersed water gap containing conductive ferrule |
| CN102133817A (en) * | 2009-11-26 | 2011-07-27 | 精工爱普生株式会社 | Liquid ejecting apparatus |
| CN102517417A (en) * | 2011-12-08 | 2012-06-27 | 辽宁科技大学 | Method for removing and controlling foreign substances in metal and alloy |
| CN103436655A (en) * | 2013-05-23 | 2013-12-11 | 沈阳东大高温材料有限公司 | Method for removing and refining inclusion and bubble from molten metal |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112658241A (en) * | 2020-12-10 | 2021-04-16 | 东北大学 | Method for preventing decarburization and reaction behavior of rare earth steel nozzle by applying interface electric field |
| CN114088754A (en) * | 2021-10-20 | 2022-02-25 | 包头钢铁（集团）有限责任公司 | Method for researching composition of attachment matter phase on inner wall of submerged nozzle for casting molten steel with different contents of rare earth |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104772452B (en) | 2017-05-03 |
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