CN105583382A - Method for suppressing casting blank inclusion segregation by means of pulse current - Google Patents
Method for suppressing casting blank inclusion segregation by means of pulse current Download PDFInfo
- Publication number
- CN105583382A CN105583382A CN201610127616.4A CN201610127616A CN105583382A CN 105583382 A CN105583382 A CN 105583382A CN 201610127616 A CN201610127616 A CN 201610127616A CN 105583382 A CN105583382 A CN 105583382A
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- pulse
- pulse current
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- segregation
- positive
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000005204 segregation Methods 0.000 title claims abstract description 23
- 238000005266 casting Methods 0.000 title claims abstract description 11
- 238000003825 pressing Methods 0.000 claims description 2
- 230000011218 segmentation Effects 0.000 claims description 2
- 238000009749 continuous casting Methods 0.000 abstract description 11
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 5
- 230000006911 nucleation Effects 0.000 abstract description 4
- 238000010899 nucleation Methods 0.000 abstract description 4
- 238000007711 solidification Methods 0.000 abstract description 4
- 230000008023 solidification Effects 0.000 abstract description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052799 carbon Inorganic materials 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000009628 steelmaking Methods 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 229910052717 sulfur Inorganic materials 0.000 abstract 1
- 239000011593 sulfur Substances 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 10
- 239000010959 steel Substances 0.000 description 10
- 239000010813 municipal solid waste Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 3
- 239000005864 Sulphur Substances 0.000 description 2
- 238000013019 agitation Methods 0.000 description 2
- 210000001367 artery Anatomy 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000005764 inhibitory process Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000010183 spectrum analysis Methods 0.000 description 1
- 210000003462 vein Anatomy 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
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The invention provides a method for suppressing casting blank inclusion segregation by means of pulse current, and relates to the technical field of steelmaking continuous casting production. The method specifically comprises the steps that the pulse current with the frequency ranging from 1 Hz to 105 Hz and the current intensity ranging from 1.0 A.m<-2> to 105 A.m<-2> is applied between every two opposite clamping rollers behind a crystallizer for continuous casting, and therefore the nucleation rate and nucleation speed of fine sulfide and carbide formed by sulfur, carbon and other elements prone to segregation in the solidification process are increased, and casting blank segregation is suppressed. The method has the beneficial effects that the treatment cost is low, operation is easy and convenient, and the effect of suppressing casting blank segregation is remarkable.
Description
Technical field
The present invention relates to steel-making continuous casting production technical field. More particularly, relate to one and utilize Pulse ElectricStream suppresses the method for casting blank foreign matter segregation.
Background technology
Due to the significant difference of the element such as carbon, sulphur solubility in the solid-liquid two-phase of steel, solidification of molten steel processIn very easily there is segregation, having a strong impact on mechanical property, fatigue behaviour and the corrosion resistance of steel, be to leadCause the high-grade steel of China's part and still need one of reason of import. Therefore, eliminate or reduce in process of settingThe harm of harmful element segregation is the important subject that metallargist pays close attention to always, is to improve steel to produceOne of product quality, the important directions that promotes China's steel industry upgrading.
So far, researchers have researched and developed the method for element segregation harm in numerous reduction process of setting,What what wherein effect was obvious is electromagnetic agitating technology and 20 century 70s grew up gently depresses skillArt, above-mentioned two technology become the important means that improves continuous casting billet quality gradually at present. Researchers pass throughLaboratory values is simulated the mode combining with industrial field, finds suitable electromagnetic agitation and light pressureLower technology can be strengthened the mobile and heat transfer of solid/liquid interfaces in process of setting, is reduced in center segregation of casting blank shapeThe harm that sulphidisation is mingled with greatly. But the forced convertion that electromagnetic agitation causes will inevitably produceSolute composition fluctuation in a big way, may aggravate the segregation of strand medium sulphide content on the contrary.
The people such as Ozbayrakta find that Prepared by Low Superheat Pouring can improve the nucleation rate of field trash, improves segregationPhenomenon. Research subsequently shows that Prepared by Low Superheat Pouring can promote sulfide to separate out at solid-liquid two-phase section forming coreAnd expand equiax crystal district, thereby obviously alleviate segregation and the internal flaw of strand. But this technology causesMolten steel flow reduces, and field trash is difficult for floating to be removed, and is mingled with reduction strand matter thereby easily form bulky grainAmount.
Therefore, attempt to find a kind of method that more effectively reduces strand segregation in process of setting.
Summary of the invention
Mode that the present invention proposes to apply pulse current in the process of setting of strand is to reduce strand segregationMethod, by conticaster, be positioned at after crystallizer between two corresponding each in pairs and folder rod of mutually insulatedBetween apply pulse current, improve sulphur in process of setting, carbon etc. easily segregation element form tiny sulfide andThe nucleation rate of carbide and forming core speed, reach the homogenising of miniaturization and the distribution of field trash, anti-with thisOnly the object of strand segregation, therefore the invention belongs to the inhibition strand segregation low, easy and simple to handle of a kind of costMethod.
The method the present invention includes is included in and on conticaster, is positioned at after crystallizer between two relatively and mutually insulatedEach to applying pulse current between folder rod, wherein:
(A) pulse current apply position: the strand from crystallizer is out along the line;
(B) pulse current applies mode: on conticaster, be positioned at after crystallizer corresponding and mutually exhausted between twoThe 2-50 of edge is to folder rod, comprise dynamic draught with on equipment toward each other and the folder rod of mutually insulated;
(C) pulse current waveform: comprise square wave and sawtooth waveforms;
(D) impulse current system: comprise positive negative pulse stuffing, positive and negative interval pulse, positive and negative proportional pulse,Positive pulse or negative pulse;
(E) pulse current density: 1Am-2～105A·cm-2, the current density between different folder rods pair canWith identical, also can there are differences, and can dynamically determine according to strand;
(F) pulse frequency: 1-105Hz, determines according to steel grade and continuous casting parameter;
(G) processing time: can be the whole process of setting of strand, also can segmentation apply Pulse ElectricStream is processed, and determines according to steel grade and continuous casting parameter.
As applied positive negative impulse current at dynamic soft-reduction with roll shop building relative on equipment, its pulse frequencyFor 100Hz～104Hz, pulse current density are 1.0Am-2～104A·m-2。
Effect of the present invention is as follows:
(1) simple to operation: the present invention is suitable for various square billets and sheet billet continuous casting, do not need change orOnly change a little existing continuous casting mode, just at the same arteries and veins of a side folder rod with in a pair of and mutually insulated folder rodThe positive pole that rushes current feedback circuit is connected, and opposite side folder rod is connected with the negative pole of impulse current generator,With clamping from crystallizer continuous casting billet out in the middle of a pair of folder rod, pass into pulse current and process, because ofSimply, the conveniently and easily realization of this process.
(2) disposal cost is low: only need in the process of setting of existing strand, apply pulse current, because ofThis only needs to expend the less electricity charge can meet processing requirements, and other method power consumption is low relatively, relevant itsIts expense is also very limited, and therefore, in improving slab quality, the cost of increase is relatively very low.
(3) suppress segregation effect excellence: through practical application, adopt this method to enter the different strand of thicknessRow is processed, and almost can reach excellent inhibition segregation effect, particularly sulfide and carbide inclusion,All obtain good refinement, and be evenly distributed, significantly improved the internal soundness of continuous casting billet.
Brief description of the drawings
Fig. 1 is that pulse current is processed strand method schematic diagram.
Fig. 2 is the microstructure observation figure of the casting blank solidification sample processed of pulse current.
Detailed description of the invention
Embodiment 1
Between by the dynamic soft-reduction folder rod of existing conticaster, carry out, after mutually insulated processing, pressing at Dynamic LightThe relative folder rod of lower device applies pulse current processing. In processing procedure according to original operation side of steel millFormula is carried out continuous casting operation, and the parameter of pulse current processing is: the current density of first pair of folder rod is 1.0Am-2, the current density of second pair of folder rod is 10Am-2, the electric current between the 3rd pair to last ten pairs folder rod is closeDegree is 100Am-2, impulse waveform is square wave, and pulse mode is positive negative pulse stuffing, and pulse frequency is 100Hz,The casting speed of strand is 1600mmmin-1, strand width is 1600mm. By analyzing, adopt arteries and veinsRush the strand segregation-free of current processing, greatly improved the quality of strand.
Utilize metallographic microscope, field emission scanning electron microscope (FE-SEM) and transmission electron microscope(TEM) the casting blank solidification sample of processing through pulse current is observed, its observed result is as Fig. 2Shown in. In Fig. 2, be field trash in white annulus, as can be seen from Figure 2 field trash is tiny and moreLoose distribution. Further energy spectrum analysis shows that these field trashes are mainly sulphide inculsion. Whole strand is enteredRow shows after analyzing, and utilizes pulse current to process the segregation of having eliminated strand completely.
As shown in Figure 2, utilize transmission electron microscope (TEM) analysis to show to have formed in metallic matrixA large amount of nano level sulphide inculsions, therefore, pulse current can effectively promote process of setting medium sulphide contentThereby the forming core Deng field trash greatly reduces segregation.
Claims (2)
1. utilize pulse current to suppress a method for casting blank foreign matter segregation, it is characterized in that described sideMethod comprises:
On conticaster, after crystallizer, relative and the each of mutually insulated applies pulse to pressing from both sides between rod between twoElectric current, wherein:
Pulse current apply position: the strand from crystallizer is out along the line;
Pulse current applies mode: on conticaster, be positioned at after crystallizer between two relatively and the 2-50 of mutually insulatedTo folder rod, comprise dynamic draught with on equipment toward each other and the folder rod of mutually insulated;
Pulse current waveform: comprise square wave and sawtooth waveforms;
Impulse current system: comprise positive negative pulse stuffing, positive and negative interval pulse, positive and negative proportional pulse, positive pulseOr negative pulse;
Pulse current density: 1Am-2～105A·cm-2, each is identical to the current density between folder rod,Or there are differences;
Pulse frequency: 1～105Hz;
Processing time: be the whole process of setting of strand, or segmentation applies pulse current processing.
2. method according to claim 1, is characterized in that, in phase on equipment for dynamic soft-reductionRight roll shop building applies positive negative impulse current, and pulse frequency is 100Hz～104Hz, and pulse current density is1.0A·m-2～104A·m-2。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610127616.4A CN105583382B (en) | 2016-03-07 | 2016-03-07 | A method of inhibit casting blank foreign matter to be segregated using pulse current |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610127616.4A CN105583382B (en) | 2016-03-07 | 2016-03-07 | A method of inhibit casting blank foreign matter to be segregated using pulse current |
Publications (2)
| Publication Number | Publication Date |
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| CN105583382A true CN105583382A (en) | 2016-05-18 |
| CN105583382B CN105583382B (en) | 2018-10-02 |
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| CN201610127616.4A Expired - Fee Related CN105583382B (en) | 2016-03-07 | 2016-03-07 | A method of inhibit casting blank foreign matter to be segregated using pulse current |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111485095A (en) * | 2020-05-11 | 2020-08-04 | 北京科技大学 | Control method for promoting homogenization treatment of continuous casting slab |
| CN115319037A (en) * | 2022-08-03 | 2022-11-11 | 北京科技大学 | Device and method for purifying non-metallic inclusions in continuous casting billet |
| CN115229150B (en) * | 2022-07-04 | 2024-05-14 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for controlling rail inclusions |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63242453A (en) * | 1987-03-30 | 1988-10-07 | Nkk Corp | Method for casting by light rolling reduction |
| EP1932931A2 (en) * | 2006-12-04 | 2008-06-18 | Heraeus, Inc. | Magnetic pulse-assisted casting of metal alloys and metal alloys produced thereby |
| CN101817071A (en) * | 2009-10-30 | 2010-09-01 | 兰州理工大学 | Electric pulse casting and rolling method of semi-solid alloy |
| CN103331435A (en) * | 2013-07-03 | 2013-10-02 | 上海大学 | Method for controlling metal solidification phase texture in combined mode through external rotating magnetic field and current and fusion casting device of method |
| CN104668526A (en) * | 2015-03-12 | 2015-06-03 | 东北大学 | Method for improving steel ingot casting quality |
-
2016
- 2016-03-07 CN CN201610127616.4A patent/CN105583382B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63242453A (en) * | 1987-03-30 | 1988-10-07 | Nkk Corp | Method for casting by light rolling reduction |
| EP1932931A2 (en) * | 2006-12-04 | 2008-06-18 | Heraeus, Inc. | Magnetic pulse-assisted casting of metal alloys and metal alloys produced thereby |
| CN101817071A (en) * | 2009-10-30 | 2010-09-01 | 兰州理工大学 | Electric pulse casting and rolling method of semi-solid alloy |
| CN103331435A (en) * | 2013-07-03 | 2013-10-02 | 上海大学 | Method for controlling metal solidification phase texture in combined mode through external rotating magnetic field and current and fusion casting device of method |
| CN104668526A (en) * | 2015-03-12 | 2015-06-03 | 东北大学 | Method for improving steel ingot casting quality |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111485095A (en) * | 2020-05-11 | 2020-08-04 | 北京科技大学 | Control method for promoting homogenization treatment of continuous casting slab |
| CN111485095B (en) * | 2020-05-11 | 2021-05-04 | 北京科技大学 | Control method for promoting homogenization treatment of continuous casting slab |
| CN115229150B (en) * | 2022-07-04 | 2024-05-14 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for controlling rail inclusions |
| CN115319037A (en) * | 2022-08-03 | 2022-11-11 | 北京科技大学 | Device and method for purifying non-metallic inclusions in continuous casting billet |
| CN115319037B (en) * | 2022-08-03 | 2024-05-14 | 北京科技大学 | Device and method for purifying nonmetallic inclusion in continuous casting billet |
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| CN105583382B (en) | 2018-10-02 |
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