CN104014754B - Method for producing high manganese steel through ultrasonic vibration crystallizer for continuous casting - Google Patents
Method for producing high manganese steel through ultrasonic vibration crystallizer for continuous casting Download PDFInfo
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- CN104014754B CN104014754B CN201410286150.3A CN201410286150A CN104014754B CN 104014754 B CN104014754 B CN 104014754B CN 201410286150 A CN201410286150 A CN 201410286150A CN 104014754 B CN104014754 B CN 104014754B
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- 238000009749 continuous casting Methods 0.000 title claims abstract description 60
- 229910000617 Mangalloy Inorganic materials 0.000 title claims abstract description 6
- 238000004519 manufacturing process Methods 0.000 title abstract description 3
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 86
- 239000010959 steel Substances 0.000 claims abstract description 86
- 238000005266 casting Methods 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 27
- 238000007670 refining Methods 0.000 claims abstract description 17
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 238000009847 ladle furnace Methods 0.000 claims abstract description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 83
- 229910052802 copper Inorganic materials 0.000 claims description 83
- 239000010949 copper Substances 0.000 claims description 83
- 229910052700 potassium Inorganic materials 0.000 claims description 36
- 239000011591 potassium Substances 0.000 claims description 36
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 35
- 239000000498 cooling water Substances 0.000 claims description 25
- 230000004913 activation Effects 0.000 claims description 23
- 239000000203 mixture Substances 0.000 claims description 8
- 239000012535 impurity Substances 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 7
- 239000011572 manganese Substances 0.000 claims description 4
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 230000007547 defect Effects 0.000 abstract description 9
- 238000011161 development Methods 0.000 abstract description 5
- 239000013078 crystal Substances 0.000 abstract description 4
- 229910052751 metal Inorganic materials 0.000 abstract description 3
- 239000002184 metal Substances 0.000 abstract description 3
- 238000009851 ferrous metallurgy Methods 0.000 abstract description 2
- 238000002844 melting Methods 0.000 abstract 1
- 230000008018 melting Effects 0.000 abstract 1
- 238000007493 shaping process Methods 0.000 abstract 1
- 230000010355 oscillation Effects 0.000 description 18
- 238000007711 solidification Methods 0.000 description 10
- 230000008023 solidification Effects 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 6
- 238000011160 research Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000002425 crystallisation Methods 0.000 description 3
- 230000008025 crystallization Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 208000037656 Respiratory Sounds Diseases 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 210000001787 dendrite Anatomy 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000010358 mechanical oscillation Effects 0.000 description 2
- 230000005499 meniscus Effects 0.000 description 2
- 238000002604 ultrasonography Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000000481 breast Anatomy 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000003631 expected effect Effects 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000009527 percussion Methods 0.000 description 1
- 150000003109 potassium Chemical class 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 230000002463 transducing effect Effects 0.000 description 1
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Abstract
The invention discloses a method for producing high manganese steel through an ultrasonic vibration crystallizer for continuous casting, belonging to the technical field of ferrous metallurgy. The method comprises the steps of primary melting by an electric furnace, refining by a ladle furnace, and tundish slab continuous casting, wherein in the tundish slab continuous casting step, a horizontal continuous casting system is adopted, molten steel refined in the ladle furnace flows through a long nozzle and is poured into the tundish from the bottom of the ladle, the molten steel in the tundish enters the horizontal continuous casting crystallizer, simultaneously, the horizontal continuous casting crystallizer generates ultrasonic vibration so that the molten steel gradually shapes, and the shaping steel is cooled in two cooling sections so as to gradually solidify to form the continuous casting high manganese steel. According to the method, the primary base shells automatically separate from the inner wall of the crystallizer only through the ultraviolet vibration force instead of the mechanical vibration of the crystallizer, so that surface defects of the high manganese steel casting blanks are eliminated or reduced; furthermore, development of the isometric crystal in the casting blanks can be promoted, and the quality of following metal products can be improved.
Description
Technical field
A kind of the invention belongs to technical field of ferrous metallurgy, more particularly, it relates to the continuous casting knot of employing ultrasonic activation
The method that brilliant device produces potassium steel.
Background technology
Potassium steel in process of production, typically all obtains steel billet using continuous casting installation for casting, in order to transporting and subsequently using.
Crystallizer is an important part in continuous casting installation for casting, is described as " heart " of conticaster.In casting process, molten steel is in crystallizer
In preliminary coagulation forming form certain thickness green shell, keep molten steel (green shell) to exist between crystallizer continuously relative simultaneously
Motion, makes the strand pulling out from crystallizer not only have certain thickness, and ensures strand in mechanical stress and thermal stress
Comprehensive function under both will not be pulled off, also will not produce the mass defects such as buckle and crackle.The operation of therefore crystallizer
And design structure parameter is most important to improving potassium steel slab quality.
In potassium steel continuous casting, crystallizer is vibrating always, its objective is to make crystallizer inwall obtain good profit
Sliding condition, the frictional force reducing between strand and crystallizer inwall can prevent molten steel from cohering with inwall again, but due to crystallizer
Vibration, can form obvious oscillation mark in casting billet surface.Oscillation mark is averagely as deep as 0.5mm, and oscillation mark bending, some steel grade casting billet surfaces
Depth of chatter mark reaches 0.5～0.7mm.The reason casting billet surface forms oscillation mark be strand during negative sliding, the speed of vibration downwards
During more than casting speed, meniscus can be pushed be formed to oscillation mark in molten steel by the normal pressure of generation in covering slag.During just slipping,
When initial solidified shell intensity is little, the inertia force of the negative pressure being formed in covering slag and fluctuation molten steel pushes green shell to crystallizer
Inwall, leads to initial solidification green shell bending or overlapping, forms oscillation mark not with hook.When the thickness of initial solidified shell is larger,
When intensity is high, initial solidification green shell can not push crystallizer inwall to, and therefore molten steel can cover on meniscus, is formed a kind of
Oscillation mark with hook.Some strands are longitudinally concave near folding corner region appearance, and bosom reaches 3.5～4.0mm, and depressed area
There is dry slag phenomenon.Do not change and at the oscillation mark the lowest point of casting billet surface, be often accompanied by the visible micro-crack of naked eyes, micro-crack formed after in outside
The extension of crackle is may result in the presence of factor.
The technical scheme being applied to continuous cast mold with regard to ultrasonic activation discloses, such as Chinese Patent Application No.:
201010251566.3, the applying date: 2010-08-05, invention and created name is: a kind of continuous casting crystallining of employing ultrasonic activation
Device device, this application case discloses a kind of continuous casting crystallizer device of employing ultrasonic activation, and this continuous casting crystallizer device includes
Tundish, crystallizer, copper plate of crystallizer, ultrasonic wave guided wave bar, transducer, ultrasonic power, described crystallizer is straight with tundish
Connect in succession, be respectively mounted ultrasonic wave guided wave bar, described ultrasonic wave guided wave bar and transducing at each back side of described copper plate of crystallizer
Device is connected, and transducer is connected with ultrasonic power by cable, is formed around cooling water tank in described copper plate of crystallizer, described
Ultrasonic wave guided wave bar is vertically connected through cooling water tank with copper plate of crystallizer, and the length of described ultrasonic wave guided wave bar is adopt
The integral multiple of ultrasonic wavelength or the integral multiple of half-wavelength.This application case is patent inventor place seminar of the present invention research
One of subject achievements, it is disclosed that following technological means: on every square metre of copper plate of crystallizer, ultrasonic wave high frequency pulse power supply
Power output is: 1000～10000w/m2, frequency is 15～60khz, and the technical scheme in this application case is based on laboratory
Experiment conclusion draws, but the technical scheme of this application case is tested in industry spot and found that its effect is unsatisfactory, especially pin
To in potassium steel casting process, this technical scheme is unable to reach expected effect, and this application case guiding continuous casting technology personnel are in work
Skill controls upper it should be noted that holding the power output on every square metre of copper plate of crystallizer and frequency, but present patent application top
Cover this mentality of designing.
Additionally, also having similar open, such as China with regard to improving the technical scheme of casting blank solidification tissue using ultrasonic technology
Number of patent application: 200810023282.1, the applying date: 2008-04-07, invention and created name is: a kind of ultrasonic wave is introduced directly into
The method that molten steel improves steel quality, the method for this application case is: after steel sample melts at a temperature of setting, from suitably ultrasonic
Ripple tool heads, using top introductory technique by ultrasonic wave be introduced directly into molten steel carry out ultrasonically treated.With regard to improving casting blank solidification tissue
Technical scheme also have Chinese Patent Application No.: 200510039030.4, the applying date: 2005-04-25, invention and created name is:
A kind of method controlling casting blank solidification structure for conticaster, this application case discloses a kind of conticaster that is used for and controls casting blank solidification
The method of structure, in the crystallizer of conticaster or the molten steel of tundish, inserts an electrode, this electrode is arrived by cable connection
The negative pole of high frequency electric source output, the positive pole of high frequency pulse power supply is connected by cables on the steel structure base of conticaster, in continuous casting
When machine is normally cast, close high frequency pulse power supply, and the output voltage of high frequency pulse power supply, electric current, frequency are adjusted to certain value, high
Frequency impulse electric field starts the solidified structure of continuous casting billet is processed.This two application cases are all patented inventions of the present invention in recent years
The subject achievements of people place seminar research, but how to control potassium steel strand table in the casting process of industry spot simultaneously
Oscillation mark and casting blank solidification tissue that face is formed, this is puzzlement inventor's technical barrier for many years, and being also puzzlement ultrasonic technology should
Great difficult problem for continuous casting working procedure.
Content of the invention
1. invent technical problem to be solved
It is an object of the invention to overcoming potassium steel casting billet surface in continuous casting in prior art easily to form obvious oscillation mark
Not enough, there is provided the method that a kind of continuous cast mold of employing ultrasonic activation produces potassium steel, using the technical side of the present invention
Case, not only can solve the casting billet surface oscillation mark that potassium steel occurs in industry spot casting process, and can improve strand
Solidified structure.
2. technical scheme
For reaching above-mentioned purpose, the technical scheme that the present invention provides is:
The method that a kind of continuous cast mold of employing ultrasonic activation of the present invention produces potassium steel, including refining work at the beginning of electric furnace
Sequence, ladle furnace refining operation and tundish sheet billet continuous casting operation, described tundish sheet billet continuous casting operation adopts horizontal casting system,
Molten steel after ladle furnace refining, from the bottom of ladle, flows through long nozzle and is injected in tundish, and the molten steel in tundish enters water
In flat continuous cast mold, produce ultrasonic activation on horizontal continuous casting crystallizer makes molten steel progressively be molded simultaneously, passes through in secondary cooling zone
Cooling, is progressively solidified into continuous casting potassium steel.
Furthermore, the mass percent of the chemical composition of potassium steel molten steel after ladle furnace refining is: c, 0.56
～0.66%；Si, 0.02～0.10%；Mn, 18.2～19.8%；P ,≤0.02%；S ,≤0.02%；N, 0.04～
0.07%；Nb, 0.36～0.42%, remaining is fe and inevitable impurity；
Horizontal casting system includes bottom ultrasonic wave guide rod, top ultrasonic wave guide rod, the first side ultrasonic wave guide rod, the second side
Ultrasonic wave guide rod, wherein:
The ultrasonic power that bottom ultrasonic wave guide rod uses is p1, p1=a × 180w+35w,
The ultrasonic frequency that bottom ultrasonic wave guide rod uses is f1, f1=a × 16khz+8khz；
In formula: a is ultrasonic wave coefficient, a=(c+si) × 100/0.5+mn × 100/10+nb × 100/2；
The ultrasonic power that top ultrasonic wave guide rod uses is p2, p2=p1 × 0.83,
The ultrasonic frequency that top ultrasonic wave guide rod uses is f2, f2=f1 × 0.94；
The ultrasonic power that first side ultrasonic wave guide rod, the second side ultrasonic wave guide rod use is p34, and p34=p1 ×
0.95,
The ultrasonic frequency that first side ultrasonic wave guide rod, the second side ultrasonic wave guide rod use is f34, and f34=f1 ×
1.02.
Furthermore, described horizontal casting system architecture is as follows: the side wall of tundish offers molten steel outlet,
This molten steel outlet is connected with horizontal continuous casting crystallizer, and the periphery of described horizontal continuous casting crystallizer is provided with crystallizer cooling water
Case, above-mentioned horizontal continuous casting crystallizer includes crystalliser feet copper coin, crystallizer top copper coin, crystallizer first side copper plate and knot
Brilliant device second side copper plate, above-mentioned crystalliser feet copper coin, crystallizer top copper coin, crystallizer first side copper plate, crystallizer
Two side copper plates surround the crystallizer internal cavity of rectangle, and this crystallizer internal cavity is in be horizontally disposed with, one end of crystallizer internal cavity and tundish
The molten steel outlet of side wall is connected, and the other end of crystallizer internal cavity is connected with space outerpace；
Described crystallizer top copper coin is obliquely installed to crystalliser feet copper coin, this crystallizer top copper coin and horizontal plane
Angle be 0.5 °；Described crystalliser feet copper coin lateral wall is provided with bottom ultrasonic wave guide rod, this bottom ultrasonic wave guide rod
Guided wave end contact with crystalliser feet copper coin lateral wall, the other end of this bottom ultrasonic wave guide rod passes through crystallizer cooling water
Case；Described crystallizer top copper coin lateral wall is provided with top ultrasonic wave guide rod, the guided wave end of this top ultrasonic wave guide rod with
Crystallizer top copper coin lateral wall contacts, and the other end of this top ultrasonic wave guide rod passes through crystallizer cooling water tank；Described
Crystallizer the first side copper plate lateral wall is provided with the first side ultrasonic wave guide rod, the guided wave end of this first side ultrasonic wave guide rod and crystallization
Device the first side copper plate lateral wall contacts, and the other end of this first side ultrasonic wave guide rod passes through crystallizer cooling water tank；Described
Crystallizer the second side copper plate lateral wall is provided with the second side ultrasonic wave guide rod, the guided wave end of this second side ultrasonic wave guide rod and crystallization
Device the second side copper plate lateral wall contacts, and the other end of this second side ultrasonic wave guide rod passes through crystallizer cooling water tank；Above-mentioned
Bottom ultrasonic wave guide rod, top ultrasonic wave guide rod, the first side ultrasonic wave guide rod, the second side ultrasonic wave guide rod are changed with respective respectively
Can device be connected, transducer is connected with respective ultrasonic power by cable.
Preferably, described bottom ultrasonic wave guide rod, top ultrasonic wave guide rod, the first side ultrasonic wave guide rod, the second side surpass
The cooling of sound wave guide rod is cooled down using the cooling water in crystallizer cooling water tank.
Preferably, described bottom ultrasonic wave guide rod, top ultrasonic wave guide rod, the first side ultrasonic wave guide rod, the second side surpass
Sound wave guide rod respectively with the crystalliser feet copper coin contacting, crystallizer top copper coin, crystallizer first side copper plate, crystallizer
The perpendicular contact of two side copper plates.
Preferably, described bottom ultrasonic wave guide rod, top ultrasonic wave guide rod, the first side ultrasonic wave guide rod, the second side surpass
The length of sound wave guide rod is the integral multiple of the respective integral multiple of ultrasonic wavelength adopting or half-wavelength.
Preferably, described bottom ultrasonic wave guide rod, top ultrasonic wave guide rod, the first side ultrasonic wave guide rod, the second side surpass
The material of sound wave guide rod is almag or titanium alloy.
3. beneficial effect
The technical scheme being provided using the present invention, compared with prior art, has a following remarkable result:
The present invention adopts horizontal continuous casting crystallizer in potassium steel casting process, produces ultrasonic on horizontal continuous casting crystallizer
Ripple vibrates, and the waveguide rod of horizontal continuous casting crystallizer four side wall adopts specific power and frequency, so that in horizontal casting
Apply ultrasonic activation on the side wall of crystallizer, produce one between the inwall and initial solidification shell of horizontal continuous casting crystallizer
Power, need not rely on the mechanical oscillation of crystallizer, and rely solely on ultrasonic activation power and make initial solidification shell automatic with crystallizer inwall
" demoulding ", thus eliminate or reduce the generation of potassium steel surface defect of bloom；The ultrasonic wave applying on the wall of crystallizer side is acceptable
It is directed through inside potassium steel strand, make the metallic dendrite fracture that inside strand, just crystalline has become, thus inside strand
Form substantial amounts of heterogeneous forming core core, promote the development of equiax crystal in strand, and then improve the quality of subsequent metal product.This
Bright so that successfully using in industry spot ultrasonic activation formula crystallizer, will promote correlation New Continuous Casting Techniques research, promote
Development of Horizontal Continuous Casting Technology, reduces the height of conticaster, saves great amount of investment, has important meaning to the development promoting continuous casting technology
Justice.
Brief description
Fig. 1 is the structural representation of horizontal casting system in the present invention；
Fig. 2 is the cross section structure schematic diagram of horizontal continuous casting crystallizer in the present invention.
Label declaration in schematic diagram: 1, ladle；2nd, tundish；3rd, horizontal continuous casting crystallizer；4th, crystallizer cooling water tank；
51st, bottom ultrasonic wave guide rod；52nd, top ultrasonic wave guide rod；53rd, the first side ultrasonic wave guide rod；54th, the second side ultrasonic wave guide rod；
61st, crystalliser feet copper coin；62nd, crystallizer top copper coin；63rd, crystallizer first side copper plate；64th, crystallizer second side copper plate.
Specific embodiment
For further appreciating that present disclosure, the present invention is described in detail in conjunction with the accompanying drawings and embodiments.
Embodiment 1
In conjunction with Fig. 1 and Fig. 2, a kind of continuous cast mold of employing ultrasonic activation of the present embodiment produces the side of potassium steel
Method, including refining operation, ladle furnace refining operation and tundish sheet billet continuous casting operation at the beginning of electric furnace.Wherein: the height after ladle furnace refining
The mass percent of the chemical composition of manganese steel molten steel is as follows: c, 0.56～0.66%；Si, 0.02～0.10%；mn、
18.2～19.8%；P ,≤0.02%；S ,≤0.02%；N, 0.04～0.07%；Nb, 0.36～0.42%, remaining be fe with
Inevitably impurity.This potassium steel steel grades adopting in the present invention, are conducive to passing through ultrasonic wave in casting process
Process and reach the purpose eliminating or reducing potassium steel surface defect of bloom, the Composition Control of mn, nb especially therein.Specifically exist
After refining in the present embodiment, the mass percent of chemical composition of molten steel is: c, 0.61%；Si, 0.06%；Mn, 18.9%；p、
0.02%；S, 0.02%；N, 0.06%；Nb, 0.38%, remaining is fe and inevitable impurity.
Tundish sheet billet continuous casting operation in the present embodiment adopts horizontal casting system, described horizontal casting system architecture
Water as follows: the side wall of tundish 2 offers molten steel outlet, and this molten steel outlet is connected with horizontal continuous casting crystallizer 3, described
The periphery of flat continuous cast mold 3 is provided with crystallizer cooling water tank 4, and above-mentioned horizontal continuous casting crystallizer 3 includes crystalliser feet
Copper coin 61, crystallizer top copper coin 62, crystallizer the first side copper plate 63 and crystallizer the second side copper plate 64, above-mentioned crystallizer bottom
Portion's copper coin 61, crystallizer top copper coin 62, crystallizer the first side copper plate 63, crystallizer the second side copper plate 64 surround the crystallization of rectangle
Device inner chamber, this crystallizer internal cavity is in be horizontally disposed with, and one end of crystallizer internal cavity is connected with the molten steel outlet of tundish 2 side wall,
The other end of crystallizer internal cavity is connected with space outerpace.
Crystallizer top copper coin 62 is obliquely installed to crystalliser feet copper coin 61, this crystallizer top copper coin 62 and horizontal plane
Angle be 0.5 °, in the present invention, design crystallizer top copper coin 62, horizontal by certain angle, is because molten steel in solidification
During can produce contraction, can be automatically separated with crystallizer top copper coin 62, if crystallizer top in the presence of self gravitation
Portion's copper coin 62 does not tilt certain angle to crystalliser feet copper coin 61, then be difficult to the ultrasonic delivery of top ultrasonic wave guide rod 52
To inside horizontal continuous casting crystallizer 3, thus lead to horizontal continuous casting crystallizer 3 upper side wall ultrasonic technique parameter uncontrollable.
As shown in Fig. 2 crystalliser feet copper coin 61 lateral wall is provided with bottom ultrasonic wave guide rod 51, the leading of this bottom ultrasonic wave guide rod 51
Ripple end is contacted with crystalliser feet copper coin 61 lateral wall, and the other end of this bottom ultrasonic wave guide rod 51 passes through crystallizer cooling water
Case 4；Described crystallizer top copper coin 62 lateral wall is provided with top ultrasonic wave guide rod 52, the leading of this top ultrasonic wave guide rod 52
Ripple end is contacted with crystallizer top copper coin 62 lateral wall, and the other end of this top ultrasonic wave guide rod 52 passes through crystallizer cooling water
Case 4；Described crystallizer the first side copper plate 63 lateral wall is provided with the first side ultrasonic wave guide rod 53, this first side ultrasonic wave guide rod
53 guided wave end is contacted with crystallizer the first side copper plate 63 lateral wall, and the other end of this first side ultrasonic wave guide rod 53 passes through knot
Brilliant device cooling water tank 4；Described crystallizer the second side copper plate 64 lateral wall is provided with the second side ultrasonic wave guide rod 54, this second side
The guided wave end of ultrasonic wave guide rod 54 is contacted with crystallizer the second side copper plate 64 lateral wall, this second side ultrasonic wave guide rod 54 another
One end passes through crystallizer cooling water tank 4；Above-mentioned bottom ultrasonic wave guide rod 51, top ultrasonic wave guide rod 52, the first side ultrasonic wave
Guide rod 53, the second side ultrasonic wave guide rod 54 are connected with respective transducer respectively, and transducer passes through cable and respective ultrasonic wave
Power supply is connected.In order to suitable cooling is carried out to guided wave bar, the bottom ultrasonic wave guide rod 51 in the present embodiment, top ultrasound waveguide
Bar 52, the first side ultrasonic wave guide rod 53, the cooling of the second side ultrasonic wave guide rod 54 adopt the cooling water in crystallizer cooling water tank 4
Cooled down.Additionally, bottom ultrasonic wave guide rod 51 in the present embodiment, top ultrasonic wave guide rod 52, the first side ultrasonic wave guide rod
53rd, the second side ultrasonic wave guide rod 54 respectively with the crystalliser feet copper coin 61 contacting, crystallizer top copper coin 62, crystallizer
One side copper plate 63, the perpendicular contact of crystallizer the second side copper plate 64；Bottom ultrasonic wave guide rod 51, top ultrasonic wave guide rod 52,
Side ultrasonic wave guide rod 53, the length of the second side ultrasonic wave guide rod 54 are the respective integral multiple of ultrasonic wavelength adopting or half-wave
Long integral multiple；Bottom ultrasonic wave guide rod 51, top ultrasonic wave guide rod 52, the first side ultrasonic wave guide rod 53, the second side ultrasonic wave
The material of guide rod 54 is titanium alloy.
In tundish sheet billet continuous casting operation, the molten steel after ladle furnace refining, from the bottom of ladle 1, flows through long nozzle and is injected into
In tundish 2, the molten steel in tundish 2 enters in horizontal continuous casting crystallizer 3, produces ultrasonic on horizontal continuous casting crystallizer 3 simultaneously
Ripple vibration makes molten steel progressively be molded, and passes through cooling in secondary cooling zone, is progressively solidified into continuous casting potassium steel.Steel after refining in the present embodiment
The mass percent of the chemical composition of water is: c, 0.61%；Si, 0.06%；Mn, 18.9%；P, 0.02%；S, 0.02%；n、
0.06%；Nb, 0.38%, remaining is fe and inevitable impurity.Therefore, a is ultrasonic wave coefficient, a=(c+si) × 100/
0.5+mn × 100/10+nb × 100/2=(0.61+0.06)/0.5+18.9/10+0.38/2=3.42, thus can obtain:
The ultrasonic power that bottom ultrasonic wave guide rod 51 uses is p1, p1=a × 180w+35w=650w,
The ultrasonic frequency that bottom ultrasonic wave guide rod 51 uses is f1, f1=a × 16khz+8khz=63khz；
The ultrasonic power that top ultrasonic wave guide rod 52 uses is p2, p2=p1 × 0.83=540w,
The ultrasonic frequency that top ultrasonic wave guide rod 52 uses is f2, f2=f1 × 0.94=59khz；
The ultrasonic power that first side ultrasonic wave guide rod 53, the second side ultrasonic wave guide rod 54 use is p34, p34=p1
× 0.95=618w,
The ultrasonic frequency that first side ultrasonic wave guide rod 53, the second side ultrasonic wave guide rod 54 use is f34, f34=f1
× 1.02=64khz.
When conticaster is normally poured into a mould, close ultrasonic power, and ultrasonic power output and frequency are adjusted to the present embodiment
The value calculating, bottom ultrasonic wave guide rod 51, top ultrasonic wave guide rod 52, the first side ultrasonic wave guide rod 53, the second side ultrasound waveguide
Bar 54 just can produce strong percussion on horizontal continuous casting crystallizer 3 side wall, eliminates steel in horizontal continuous casting crystallizer 3
Water solidified shell and the bonding of inwall, are internally formed substantial amounts of heterogeneous forming core core in strand simultaneously, promote equiax crystal in strand
Development.After potassium steel steel billet in the present embodiment goes out horizontal continuous casting crystallizer 3, it is sprayed on potassium steel steel billet with cooling water, enters
Row forces quick cooling, and the molten steel in tundish 2 is all pulled into after a steel billet, terminates cast.
Always well known, in order to mitigate the defect that mold oscillation brings to potassium steel strand, improve cc billet surface quality, subtract
Little depth of chatter mark, people carry out intensive research in the vibration to crystallizer always.But, mold oscillation mode
Improve and can't resolve the intrinsic vibration failure of strand, so people are constantly developing the crystallizer of new structure always.This
The restriction breaching traditional mechanical oscillation based on the horizontal continuous casting crystallizer 3 of ultrasonic activation formula of bright proposition, the present invention is led to
Cross the concrete calculation that the analysis and summary to lot of experimental data determines ultrasonic wave coefficient, and from horizontal continuous casting crystallizer
The technological parameter of 3 each side wall Comprehensive Control ultrasonic wave, be by ultrasonic activation be applied to one of industrial continuous casting new
Oscillation Technique of Mould, it may advantageously facilitate does not have the flawless continuous-casting billet of the surface defects such as oscillation mark to produce.Additionally, level is even
The ultrasonic wave applying on casting crystallizer 3 side wall can also be directed through, inside potassium steel strand, making just to crystallize inside strand
The metallic dendrite fracture being formed, thus being internally formed substantial amounts of heterogeneous forming core core in strand, in promotion strand, equiax crystal sends out
Exhibition, and then improve the quality of subsequent metal product.The potassium steel strand of the present embodiment, through surface defects detection, does not almost find
Oscillation mark, and improve solidified structure, improve slab quality.
Embodiment 2
The method that a kind of continuous cast mold of employing ultrasonic activation of the present embodiment produces potassium steel, its step is with enforcement
Example 1, difference is:
After refining in the present embodiment, the mass percent of chemical composition of molten steel is: c, 0.56%；Si, 0.10%；mn、
18.2%；P, 0.01%；S, 0.02%；N, 0.04%；Nb, 0.42%, remaining is fe and inevitable impurity.Therefore, a is
Ultrasonic wave coefficient, a=(c+si) × 100/0.5+mn × 100/10+nb × 100/2=3.35, thus can obtain:
The ultrasonic power that bottom ultrasonic wave guide rod 51 uses is p1, p1=a × 180w+35w=638w,
The ultrasonic frequency that bottom ultrasonic wave guide rod 51 uses is f1, f1=a × 16khz+8khz=62khz；
The ultrasonic power that top ultrasonic wave guide rod 52 uses is p2, p2=p1 × 0.83=529w,
The ultrasonic frequency that top ultrasonic wave guide rod 52 uses is f2, f2=f1 × 0.94=58khz；
The ultrasonic power that first side ultrasonic wave guide rod 53, the second side ultrasonic wave guide rod 54 use is p34, p34=p1
× 0.95=606w,
The ultrasonic frequency that first side ultrasonic wave guide rod 53, the second side ultrasonic wave guide rod 54 use is f34, f34=f1
× 1.02=63khz.
The potassium steel strand of the present embodiment, through surface defects detection, does not almost find oscillation mark, and improves solidified structure,
Improve slab quality.
Embodiment 3
The method that a kind of continuous cast mold of employing ultrasonic activation of the present embodiment produces potassium steel, its step is with enforcement
Example 1, difference is:
After refining in the present embodiment, the mass percent of chemical composition of molten steel is: c, 0.66%；Si, 0.02%；mn、
19.8%；P, 0.02%；S, 0.01%；N, 0.07%；Nb, 0.36%, remaining is fe and inevitable impurity.Therefore, a is
Ultrasonic wave coefficient, a=(c+si) × 100/0.5+mn × 100/10+nb × 100/2=3.52, thus can obtain:
The ultrasonic power that bottom ultrasonic wave guide rod 51 uses is p1, p1=a × 180w+35w=669w,
The ultrasonic frequency that bottom ultrasonic wave guide rod 51 uses is f1, f1=a × 16khz+8khz=64khz；
The ultrasonic power that top ultrasonic wave guide rod 52 uses is p2, p2=p1 × 0.83=555w,
The ultrasonic frequency that top ultrasonic wave guide rod 52 uses is f2, f2=f1 × 0.94=60khz；
The ultrasonic power that first side ultrasonic wave guide rod 53, the second side ultrasonic wave guide rod 54 use is p34, p34=p1
× 0.95=635w,
The ultrasonic frequency that first side ultrasonic wave guide rod 53, the second side ultrasonic wave guide rod 54 use is f34, f34=f1
× 1.02=65khz.
The potassium steel strand of the present embodiment, through surface defects detection, does not almost find oscillation mark, and improves solidified structure,
Improve slab quality.
Claims (6)
1. the method that a kind of continuous cast mold of employing ultrasonic activation produces potassium steel, including refining operation, ladle furnace at the beginning of electric furnace
Refining procedure and tundish sheet billet continuous casting operation it is characterised in that:
Described tundish sheet billet continuous casting operation adopt horizontal casting system, the molten steel after ladle furnace refining from the bottom of ladle (1),
Flow through long nozzle to be injected in tundish (2), the molten steel in tundish (2) enters in horizontal continuous casting crystallizer (3), level simultaneously
The upper ultrasonic activation that produces of continuous cast mold (3) makes molten steel progressively be molded, and passes through cooling in secondary cooling zone, is progressively solidified into continuous casting high
Manganese steel；
The mass percent of the chemical composition of potassium steel molten steel after ladle furnace refining is: c, 0.56～0.66%；Si, 0.02～
0.10%；Mn, 18.2～19.8%；P ,≤0.02%；S ,≤0.02%；N, 0.04～0.07%；Nb, 0.36～0.42%,
Remaining is fe and inevitable impurity；
Horizontal casting system includes bottom ultrasonic wave guide rod (51), top ultrasonic wave guide rod (52), the first side ultrasonic wave guide rod
(53), the second side ultrasonic wave guide rod (54), wherein:
The ultrasonic power that bottom ultrasonic wave guide rod (51) uses is p1, p1=a × 180w+35w,
The ultrasonic frequency that bottom ultrasonic wave guide rod (51) uses is f1, f1=a × 16khz+8khz；
In formula:
A is ultrasonic wave coefficient, a=(c+si) × 100/0.5+mn × 100/10+nb × 100/2；
The ultrasonic power that top ultrasonic wave guide rod (52) uses is p2, p2=p1 × 0.83,
The ultrasonic frequency that top ultrasonic wave guide rod (52) uses is f2, f2=f1 × 0.94；
The ultrasonic power that first side ultrasonic wave guide rod (53), the second side ultrasonic wave guide rod (54) use is p34, p34=p1
× 0.95,
The ultrasonic frequency that first side ultrasonic wave guide rod (53), the second side ultrasonic wave guide rod (54) use is f34, f34=f1
×1.02.
2. the method that a kind of continuous cast mold of employing ultrasonic activation according to claim 1 produces potassium steel, it is special
Levy and be, described horizontal casting system architecture is as follows: the side wall of tundish (2) offers molten steel outlet, this molten steel outlet
It is connected with horizontal continuous casting crystallizer (3), the periphery of described horizontal continuous casting crystallizer (3) is provided with crystallizer cooling water tank
(4), above-mentioned horizontal continuous casting crystallizer (3) includes crystalliser feet copper coin (61), crystallizer top copper coin (62), crystallizer the
One side copper plate (63) and crystallizer second side copper plate (64), above-mentioned crystalliser feet copper coin (61), crystallizer top copper coin
(62), crystallizer first side copper plate (63), crystallizer second side copper plate (64) surround the crystallizer internal cavity of rectangle, in this crystallizer
Chamber be in be horizontally disposed with, one end of crystallizer internal cavity is connected with the molten steel outlet of tundish (2) side wall, crystallizer internal cavity another
End is connected with space outerpace；
Described crystallizer top copper coin (62) is obliquely installed to crystalliser feet copper coin (61), this crystallizer top copper coin (62)
Angle with horizontal plane is 0.5 °；Described crystalliser feet copper coin (61) lateral wall is provided with bottom ultrasonic wave guide rod (51),
The guided wave end of this bottom ultrasonic wave guide rod (51) is contacted with crystalliser feet copper coin (61) lateral wall, this bottom ultrasonic wave guide rod
(51) the other end passes through crystallizer cooling water tank (4)；Described crystallizer top copper coin (62) lateral wall is provided with top and surpasses
Sound wave guide rod (52), the guided wave end at this top ultrasonic wave guide rod (52) is contacted with crystallizer top copper coin (62) lateral wall, should
The other end at top ultrasonic wave guide rod (52) passes through crystallizer cooling water tank (4)；Described crystallizer first side copper plate (63) is outward
Side wall is provided with the first side ultrasonic wave guide rod (53), the guided wave end of this first side ultrasonic wave guide rod (53) and crystallizer the first side copper
Plate (63) lateral wall contacts, and the other end of this first side ultrasonic wave guide rod (53) passes through crystallizer cooling water tank (4)；Described
Crystallizer second side copper plate (64) lateral wall is provided with the second side ultrasonic wave guide rod (54), this second side ultrasonic wave guide rod (54)
Guided wave end is contacted with crystallizer second side copper plate (64) lateral wall, and the other end of this second side ultrasonic wave guide rod (54) passes through knot
Brilliant device cooling water tank (4)；Above-mentioned bottom ultrasonic wave guide rod (51), top ultrasonic wave guide rod (52), the first side ultrasonic wave guide rod
(53), the second side ultrasonic wave guide rod (54) is connected with respective transducer respectively, and transducer passes through cable and respective ultrasonic wave
Power supply is connected.
3. the method that a kind of continuous cast mold of employing ultrasonic activation according to claim 2 produces potassium steel, it is special
Levy and be: described bottom ultrasonic wave guide rod (51), top ultrasonic wave guide rod (52), the first side ultrasonic wave guide rod (53), second
The cooling of side ultrasonic wave guide rod (54) adopts the cooling water in crystallizer cooling water tank (4) to be cooled down.
4. the method that a kind of continuous cast mold of employing ultrasonic activation according to claim 2 produces potassium steel, it is special
Levy and be: described bottom ultrasonic wave guide rod (51), top ultrasonic wave guide rod (52), the first side ultrasonic wave guide rod (53), second
Side ultrasonic wave guide rod (54) respectively with the crystalliser feet copper coin (61) contacting, crystallizer top copper coin (62), crystallizer
One side copper plate (63), the perpendicular contact of crystallizer second side copper plate (64).
5. the method that a kind of continuous cast mold of the employing ultrasonic activation according to claim 3 or 4 produces potassium steel, its
Be characterised by: described bottom ultrasonic wave guide rod (51), top ultrasonic wave guide rod (52), the first side ultrasonic wave guide rod (53),
The length of two sides ultrasonic wave guide rod (54) is the integral multiple of the respective integral multiple of ultrasonic wavelength adopting or half-wavelength.
6. the method that a kind of continuous cast mold of employing ultrasonic activation according to claim 5 produces potassium steel, it is special
Levy and be: described bottom ultrasonic wave guide rod (51), top ultrasonic wave guide rod (52), the first side ultrasonic wave guide rod (53), second
The material of side ultrasonic wave guide rod (54) is almag or titanium alloy.
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| CN101905295A (en) * | 2010-08-05 | 2010-12-08 | 安徽工业大学 | Continuous casting crystallizer device using ultrasonic vibration |
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