CN105583382B - A method of inhibit casting blank foreign matter to be segregated using pulse current - Google Patents
A method of inhibit casting blank foreign matter to be segregated using pulse current Download PDFInfo
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- CN105583382B CN105583382B CN201610127616.4A CN201610127616A CN105583382B CN 105583382 B CN105583382 B CN 105583382B CN 201610127616 A CN201610127616 A CN 201610127616A CN 105583382 B CN105583382 B CN 105583382B
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- Prior art keywords
- pulse
- current
- pulse current
- nip rolls
- segregation
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000005266 casting Methods 0.000 title claims abstract description 9
- 238000005204 segregation Methods 0.000 claims abstract description 20
- 230000002401 inhibitory effect Effects 0.000 claims abstract description 3
- 238000000137 annealing Methods 0.000 claims description 7
- 230000011218 segmentation Effects 0.000 claims 1
- 238000009749 continuous casting Methods 0.000 abstract description 10
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 abstract description 9
- 230000000694 effects 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
- 239000005864 Sulphur Substances 0.000 abstract description 3
- 230000005764 inhibitory process Effects 0.000 abstract description 3
- 230000006911 nucleation Effects 0.000 abstract description 3
- 238000010899 nucleation Methods 0.000 abstract description 3
- 229910052799 carbon Inorganic materials 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000009628 steelmaking Methods 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 10
- 239000010959 steel Substances 0.000 description 10
- 239000010813 municipal solid waste Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 238000013019 agitation Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 210000001367 artery Anatomy 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 210000003462 vein Anatomy 0.000 description 2
- 229910021386 carbon form Inorganic materials 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000000047 product 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
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 present invention proposes a kind of method inhibiting casting blank foreign matter segregation using pulse current, is related to steel-making continuous casting production technical field.In particular, apply between nip rolls facing each other after continuous cast mold frequency be 1Hz~105Hz, current density 1.0Am‑2~105Am‑2Pulse current, form the nucleation rate and core forming speed of tiny sulfide and carbide to improve the easily segregation element such as sulphur in process of setting, carbon, inhibit strand segregation.The present invention has many advantages, such as that processing cost is low, simple to operate and inhibition strand segregation is with obvious effects.
Description
Technical field
The present invention relates to steel-making continuous casting production technical fields.More particularly, it is related to a kind of utilization pulse current inhibition casting
The method of base field trash segregation.
Background technology
Due to the significant difference of the elements such as carbon, sulphur solubility in the solid-liquid two-phase of steel, easily sent out during solidification of molten steel
Raw segregation, drastically influences mechanical property, fatigue behaviour and the corrosion resistance of steel, is to lead to the high-grade steel in China part still
One of the reason of needing import.Therefore, it is always metallargist to eliminate or reduce the harm that harmful element is segregated in process of setting
The important subject of concern is one of the important directions for improving steel product quality, pushing the upgrading of China's steel industry.
So far, researchers have researched and developed the method that element segregation endangers in numerous reduction process of setting, wherein imitating
The obvious soft reduction technique for being electromagnetic agitating technology with growing up the 1970s of fruit, current above-mentioned two technologies
It is increasingly becoming the important means for improving continuous casting billet quality.Researchers are simulated by laboratory values and are mutually tied with industrial field
The mode of conjunction finds that suitable electromagnetic agitation and soft reduction technique can strengthen the flowing of solid/liquid interfaces and biography in process of setting
Heat reduces and forms the harm that sulfide is mingled with greatly in center segregation of casting blank.However, forced convertion caused by electromagnetic agitation can not
Solute component fluctuation in the generation wide range avoided, may aggravate the segregation of sulfide in strand instead.
Ozbayrakta et al. has found that Prepared by Low Superheat Pouring can improve the nucleation rate of field trash, improves segregation phenomena.With
Afterwards research shows that Prepared by Low Superheat Pouring can promote sulfide solid-liquid two-phase section forming core be precipitated and expand isometric crystalline region, from
And segregation and the internal flaw of substantially reduced strand.But the technology causes molten steel flow reduction, field trash to be not easy to float and go
It removes, easily forms bulky grain and be mingled with to reduce slab quality.
Accordingly, it is intended to find a kind of more efficient method for reducing strand segregation in process of setting.
Invention content
The present invention proposes to apply the mode of pulse current in the process of setting of strand to reduce the method for strand segregation, lead to
It crosses between being located at after crystallizer corresponding each pairs of and nip rolls of mutually insulated two-by-two on conticaster and applies pulse current, carry
The easily segregation element such as sulphur, carbon forms the nucleation rate and core forming speed of tiny sulfide and carbide in high process of setting, reaches folder
The homogenization of miniaturization and the distribution of sundries prevents the purpose that strand is segregated with this, therefore the invention belongs to a kind of at low cost, behaviour
Make the easy method for inhibiting strand segregation.
Method by the invention include be located on conticaster it is opposite two-by-two and mutually insulated each to pressing from both sides after crystallizer
Apply pulse current between roller, wherein：
(A) application position of pulse current：From crystallizer come out after strand along；
(B) pulse current applying mode：It is 2-50 pairs corresponding and mutually insulated two-by-two after crystallizer on conticaster
Nip rolls relative to each other and mutually insulated on nip rolls, including dynamic draught equipment；
(C) pulse current waveform：Including square wave and sawtooth wave；
(D) impulse current system：Including positive negative pulse stuffing, positive and negative interval pulse, positive and negative proportional pulse, positive pulse or negative arteries and veins
Punching；
(E) pulse current density：1A·m-2~105Am-2, the current density between different nip rolls pair can be identical, also may be used
To have differences, and can be dynamically determined according to strand；
(F) pulse frequency：1-105Hz is determined according to steel grade and continuous casting parameter；
(G) processing time：It can be the entire process of setting of strand, application pulsed current annealing can also be segmented, according to
Steel grade and continuous casting parameter determine.
Apply positive negative impulse current, pulse frequency 100Hz between such as nip rolls opposite in dynamic soft-reduction equipment
~104Hz, pulse current density 1.0Am-2~104Am-2。
The effect of the present invention is as follows：
(1) simple to operate：The present invention is suitable for various square billets and sheet billet continuous casting, haves no need to change or only slightly changes
Existing continuous casting mode, only the side nip rolls in same a pair of and mutually insulated nip rolls is connected with the anode of impulse current generator
Connect, other side nip rolls is connected with the cathode of impulse current generator, with a pair of nip rolls among hold from crystallizer come out
Continuous casting billet is passed through pulse current and is handled, therefore process is simple, convenient and easy to implement.
(2) processing cost is low：It only needs to apply pulse current in the process of setting of existing strand, therefore only needs to expend
The less electricity charge can meet processing requirement, and relatively other method power consumptions are low, and relevant other expenditure is also very limited, therefore
While improving slab quality, increased cost is relatively very low.
(3) inhibit segregation excellent effect：Through practical application, handled using this method strand different to thickness, it is several
It is attained by excellent inhibition segregation effect, especially sulfide and carbide inclusion, has obtained preferable refinement, and divide
Cloth is uniform, significantly improves the internal soundness of continuous casting billet.
Description of the drawings
Fig. 1 is pulsed current annealing strand method schematic diagram.
Fig. 2 is the microstructure observation chart for the casting blank solidification sample that pulsed current annealing is crossed.
Specific implementation mode
Embodiment 1
After carrying out mutually insulated processing between the dynamic soft-reduction nip rolls by existing conticaster, in dynamic soft-reduction device
Opposite nip rolls applies pulsed current annealing.In processing procedure continuous casting operation, pulse are carried out according to the original mode of operation of steel mill
The parameter of current processing is：The current density of first pair of nip rolls is 1.0Am-2, the current density of second pair of nip rolls is 10Am-2, third is to being 100Am to the current density last ten betweens of nip rolls-2, impulse waveform is square wave, and pulse mode is positive and negative arteries and veins
The casting speed of punching, pulse frequency 100Hz, strand is 1600mmmin-1, strand width is 1600mm.By analysis, adopt
With the strand segregation-free of pulsed current annealing, the quality of strand is greatly improved.
Using metallographic microscope, field emission scanning electron microscope (FE-SEM) and transmission electron microscope (TEM) to warp
The casting blank solidification sample that extra pulse current processing is crossed is observed, and observed result is as shown in Figure 2.In fig. 2, in white annulus
For field trash, as can be seen from Figure 2 field trash is tiny and Dispersed precipitate.It is further able to spectrum analysis and shows that these field trashes are main
For sulphide inculsion.Show to completely eliminate the segregation of strand after analyzing entire strand using pulsed current annealing.
As shown in Fig. 2, using transmission electron microscope (TEM) analysis shows foring a large amount of nanoscales in metallic matrix
Sulphide inculsion, therefore, pulse current can effectively facilitate the forming cores of the field trashes such as sulfide in process of setting to greatly
Ground reduces segregation.
Claims (2)
1. a kind of method inhibiting casting blank foreign matter segregation using pulse current, which is characterized in that the method includes：
On conticaster be located at crystallizer after two-by-two with respect to and each pair of nip rolls of mutually insulated between apply pulse current, wherein：
The application position of pulse current：From crystallizer come out after strand along；
Pulse current applying mode：On conticaster be located at crystallizer after two-by-two with respect to and mutually insulated 2-50 to nip rolls, including
Nip rolls relative to each other and mutually insulated in dynamic draught equipment；
Pulse current waveform：Including square wave and sawtooth wave；
Impulse current system：Including positive negative pulse stuffing, positive and negative interval pulse, positive and negative proportional pulse, positive pulse or negative pulse；
Pulse current density：1A·m-2~105Am-2, the current density each between of nip rolls is identical, or is had differences；
Pulse frequency：1~105Hz；
Processing time：Apply pulsed current annealing for the entire process of setting of strand, or segmentation.
2. according to the method described in claim 1, it is characterized in that, applying between nip rolls opposite in dynamic soft-reduction equipment
Positive negative impulse current, pulse frequency are 100Hz~104Hz, pulse current density 1.0Am-2~104Am-2。
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| Application Number | Priority Date | Filing Date | Title |
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| 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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| 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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| Publication Number | Publication Date |
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| CN105583382A CN105583382A (en) | 2016-05-18 |
| CN105583382B true CN105583382B (en) | 2018-10-02 |
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| 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 |
| 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 |
| CN115635053A (en) * | 2022-10-31 | 2023-01-24 | 东北大学 | Adjustable electric field structure for metal casting and rolling device and electric field applying method |
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| JPS63242453A (en) * | 1987-03-30 | 1988-10-07 | Nkk Corp | Method for casting by light rolling reduction |
| TW200835800A (en) * | 2006-12-04 | 2008-09-01 | Heraeus Inc | Magnetic pulse-assisted casting of metal alloys & 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 |
| CN104668526B (en) * | 2015-03-12 | 2017-08-08 | 东北大学 | Improve the method for steel ingot ingot quality |
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