CN104084552B - A kind of continuous cast method - Google Patents
A kind of continuous cast method Download PDFInfo
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- CN104084552B CN104084552B CN201410299728.9A CN201410299728A CN104084552B CN 104084552 B CN104084552 B CN 104084552B CN 201410299728 A CN201410299728 A CN 201410299728A CN 104084552 B CN104084552 B CN 104084552B
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Abstract
The invention discloses a kind of continuous cast method, the method includes making the strand not solidified completely pull out from the crystallizer vertically vibrating, and wherein, numerical value in units of mm for the amplitude of described crystallizer is as A=C1+C2V, wherein, C1It is 23, C2Being 34, V is numerical value in units of m/min for the pulling rate of strand, and numerical value in units of Hz for the vibration frequency of described crystallizer is as f=C3+C4V, wherein, C3It is 150 160, C4It is 20 10.By designing new Oscilation Parameters of Mold, oscillation mark spacing and the depth of chatter mark of strand can be reduced, such that it is able to reduce the transverse corner crack line rate of the strand producing, peeling ratio of defects, improve product quality.
Description
Technical field
The present invention relates to continuous casting technology field, in particular it relates to a kind of continuous cast method.
Background technology
Mold oscillation technology for CC is to affect the key technology that continuous casting billet produces, its vibrational waveform (speed
Curve) differentiation each time and development all significant impact is created to continuous casting process and slab quality.With
The development of continuous casting technology, the requirement to cc billet surface quality is more and more higher, and strict control depth of chatter mark is to solve
The certainly main path of cc billet surface quality.
Mold oscillation, while improving lubrication of crystallizer, avoid bonding, raising pulling rate, makes casting also
Base surface creates oscillation mark.Continuous casting billet transverse corner crack line frequently occurs at oscillation mark trough, when oscillation mark is deep
Transverse corner crack line is easily produced at trough.This is that strand inner arc side is drawn owing to strand is when aligning
Stretch stress, and at oscillation mark trough, stress is more concentrated, and at oscillation mark trough, be filled with covering slag, cause
Cooling velocity reduces herein, and solidified structure is thick, and green shell intensity is low.It is often again analysis at oscillation mark trough simultaneously
Go out the cradle of thing, micro alloying element such as S, Al, V, N etc. fragility shadow to low-temperature thermoplastic district
Ring very big.When other casting blank surface temperature is less than 800 DEG C, owing to austenite grain boundary separates out ferrite, this
One process simultaneously facilitates the precipitation of AlN and other carbonitrides, increases the fragility of steel.
In view of this, it is desirable to provide a kind of continuous cast method that can reduce the generation of continuous casting billet corner crack.
Content of the invention
The problem to be solved of the present invention be to provide a kind of can reduce continuous casting billet corner crack generate
Continuous cast method.
In order to solve the problems referred to above, the present invention provides a kind of continuous cast method, and the method includes making not coagulate completely
Solid strand pull out from the crystallizer vertically vibrating, wherein, the amplitude of described crystallizer with
Mm be the numerical value of unit be A=C1+C2V, wherein, C1For 2-3, C2For 3-4, V is drawing of strand
Numerical value in units of m/min for the speed, numerical value in units of Hz for the vibration frequency of described crystallizer is
F=C3+C4V, wherein, C3For 150-160, C4For-20-10.
Preferably, the pulling rate of described strand is 0.7-1.2m/min.
Preferably, the waveform deviation proportion a=2 (C of the non-sinusoidal oscillation curve of described crystallizer5-0.5), wherein
C5For the non-sine factor, C5For 0.5-0.7.
Preferably, the section of described strand is (950～1930) mm × 230mm.
By technique scheme, by designing new Oscilation Parameters of Mold, shaking of strand can be reduced
Trace spacing and depth of chatter mark, such that it is able to reduce the transverse corner crack line rate of the strand producing, peeling ratio of defects,
Improve product quality.
Other features and advantages of the present invention will be described in detail in detailed description of the invention part subsequently.
Detailed description of the invention
Hereinafter the detailed description of the invention of the present invention is described in detail.It should be appreciated that this place is retouched
The detailed description of the invention stated is merely to illustrate and explains the present invention, is not limited to the present invention.
The invention provides a kind of continuous cast method, the method includes making the strand not solidified completely from along vertically
Pull-out in the crystallizer of direction vibration, wherein, numerical value in units of mm for the amplitude of described crystallizer is
A=C1+C2V, wherein, C1For 2-3, C2For 3-4, V is that the pulling rate of strand is in units of m/min
Numerical value, numerical value in units of Hz for the vibration frequency of described crystallizer is as f=C3+C4V, wherein, C3
For 150-160, C4For-20-10.
Crystallizer is accepted the molten steel from pans injection and is allowed to be frozen into firm base by regulation section configuration
Shell, and crystallizer is by vibrating so that strand is pulled out smoothly by withdrawal straightening machine, it is to avoid bonding.At this
In bright scheme, the frequency of the casting speed control mold oscillation according to withdrawal straightening machine and amplitude, optimize crystallization
The vibration mode of device, reduces oscillation mark spacing and the depth of chatter mark of strand, thus reduces its surface corner
Transverse crack rate and peeling ratio of defects, improve product quality.
In the vibration processes of crystallizer, the oscillation mark spacing of strand is mainly relevant with vibration frequency and pulling rate,
I.e. numerical value in units of mm for the oscillation mark spacing is as L=1000V/f.By the vibration parameters of preferred crystallizer,
Can allow slightly to improve the pulling rate of described strand on the premise of ensureing slab quality, specifically, described
The pulling rate of strand is 0.7-1.2m/min.
In addition, the waveform deviation proportion a=2 (C of the non-sinusoidal oscillation curve of described crystallizer5-0.5), wherein
C5For the non-sine factor, C5For 0.5-0.7.By the oscillating curve of described crystallizer is set to anon-normal
Chord vibration curve, can shorten the negative slip time, reduces depth of chatter mark.Specifically, the negative slip time
T=60 (1-a) arccos [1000 (1-a) V/ (π 2Af)]/π f, it is seen then that the negative slip time, t was with waveform deflection
The increase of rate a and reduce, therefore use non-sinusoidal oscillation curve to contribute to reduce the negative slip time.
In addition, continuous cast method of the present invention can apply to the production of big cross section strand, specifically,
The section of described strand is (950～1930) mm × 230mm；
Embodiment
Illustrate below by way of the continuous cast method to the present invention for the concrete production instance.The continuous casting of the present invention
Method goes for producing most of steel grade, especially, it is adaptable to produce low-alloy steel, below with
As a example by SAPH440 steel grade and pipe line steel X60, the continuous cast method of the present invention is illustrated, chemical constituent
It is as follows,
SAPH440
Pipe line steel X60
Embodiment 1
Producing SAPH440 steel grade, casting blank section is 950mm × 230mm, and vibration parameters is set to
C1=2, C2=3, C3=150, C4=10, C5=0.7, V=1.2m/min, thus can obtain, and amplitude is
A=5.6mm, vibration frequency is f=162Hz, and oscillation mark spacing is L=7.4mm, can be obtained by detection, raw
The transverse corner crack line rate producing strand is 0.12%, and peeling ratio of defects is 2.58%.
Embodiment 2
Producing SAPH440 steel grade, casting blank section is 1550mm × 230mm, and vibration parameters is set to
C1=2.5, C2=4, C3=154, C4=-5, C5=0.5, V=1.0m/min, thus can obtain, and amplitude is
A=6.5mm, vibration frequency is f=149Hz, and oscillation mark spacing is L=6.7mm, can be obtained by detection, raw
The transverse corner crack line rate producing strand is 0.15%, and peeling ratio of defects is 3.12%.
Embodiment 3
Production flow line steel X60, casting blank section is 1930mm × 230mm, and vibration parameters is set to C1=3,
C2=3.5, C3=160, C4=-20, C5=0.6, V=0.7m/min, thus can obtain, and amplitude is A=2.45mm,
Vibration frequency is f=148Hz, and oscillation mark spacing is L=4.7mm, can be obtained by detection, produces the angle of strand
Portion's transverse crack rate is 0.20%, and peeling ratio of defects is 3.43%.
Embodiment 4
Producing SAPH440 steel grade, casting blank section is 1650mm × 230mm, and vibration parameters is set to
C1=3, C2=3.5, C3=160, C4=-20, C5=0.6, V=0.7m/min, thus can obtain, and amplitude is
A=2.45mm, vibration frequency is f=148Hz, and oscillation mark spacing is L=4.7mm, can be obtained by detection,
The transverse corner crack line rate producing strand is 0.18%, and peeling ratio of defects is 3.25%.
Embodiment 5
Production flow line steel X60, casting blank section is 1250mm × 230mm, and vibration parameters is set to
C1=2.5, C2=4, C3=156, C4=-5, C5=0.5, V=1.0m/min, thus can obtain, and amplitude is
A=6.5mm, vibration frequency is f=151Hz, and oscillation mark spacing is L=6.6mm, can be obtained by detection, raw
The transverse corner crack line rate producing strand is 0.14%, and peeling ratio of defects is 2.98%.
Embodiment 6
Production flow line steel X60, casting blank section is 950mm × 230mm, and vibration parameters is set to C1=2,
C2=3, C3=150, C4=10, C5=0.7, V=1.2m/min, thus can obtain, and amplitude is A=5.6mm,
Vibration frequency is f=162Hz, and oscillation mark spacing is L=7.4mm, can be obtained by detection, produces the angle of strand
Portion's transverse crack rate is 0.13%, and peeling ratio of defects is 2.75%.
Before using the continuous cast method of the present invention, in original continuous cast method, vibration parameters is set to
C1=1, C2=5, C3=140, C4=20, C5=0.8, the transverse corner crack line rate producing strand is about 64%,
Peeling ratio of defects is about 26%.As can be seen here, the continuous cast method of the present invention and former continuous cast method ratio, bright
Improve the quality of production of strand aobviously.
The preferred embodiment of the present invention described in detail above, but, the present invention is not limited to above-mentioned reality
Execute the detail in mode, in the technology concept of the present invention, can be to the technical side of the present invention
Case carries out multiple simple variant, and these simple variant belong to protection scope of the present invention.
It is further to note that each the concrete technology described in above-mentioned detailed description of the invention is special
Levy, in the case of reconcilable, can be combined by any suitable means, in order to avoid need not
The repetition wanted, various possible combinations are no longer illustrated by the present invention separately.
Additionally, also can be combined between the various different embodiment of the present invention, as long as its
Without prejudice to the thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (3)
1. a continuous cast method, the method includes making the strand not solidified completely vibrate from vertically
Crystallizer in pull-out, it is characterised in that numerical value in units of mm for the amplitude of described crystallizer is
A=C1+C2V, wherein, C1For 2-3, C2For 3-4, V is that the pulling rate of strand is in units of m/min
Numerical value, numerical value in units of Hz for the vibration frequency of described crystallizer is as f=C3+C4V, wherein, C3
For 150-160, C4For-20-10, and the waveform deviation proportion of the non-sinusoidal oscillation curve of described crystallizer
A=2 (C5-0.5), wherein C5For the non-sine factor, C5For 0.5-0.7.
2. continuous cast method according to claim 1, it is characterised in that the pulling rate of described strand is
0.7-1.2m/min。
3. continuous cast method according to claim 1, it is characterised in that the section of described strand is
(950～1930) mm × 230mm.
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| CN201410299728.9A CN104084552B (en) | 2014-06-27 | 2014-06-27 | A kind of continuous cast method |
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| CN201410299728.9A CN104084552B (en) | 2014-06-27 | 2014-06-27 | A kind of continuous cast method |
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| CN104084552B true CN104084552B (en) | 2016-11-09 |
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| CN109382493B (en) * | 2018-11-28 | 2021-03-16 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for improving peeling defect of hot-rolled pickled plate |
| CN115106497A (en) * | 2022-06-14 | 2022-09-27 | 河钢乐亭钢铁有限公司 | Method for controlling vibration mark defect of continuous casting slab |
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| JPH05181736A (en) * | 1991-12-29 | 1993-07-23 | Nec Corp | Hypermedia system |
| CN100341641C (en) * | 2003-07-31 | 2007-10-10 | 任廷志 | Variable speed gear with nonsinusoidal vibration in continuous casting crystallizer |
| CN101337267B (en) * | 2008-08-13 | 2010-06-09 | 中冶连铸技术工程股份有限公司 | Plate-blank crystallizer hydraulic vibration device |
| CN101433948B (en) * | 2008-12-17 | 2011-05-11 | 马钢设计研究院有限责任公司 | Round billet continuous casting machine with especially big sectional plane |
| CN101992283A (en) * | 2009-08-10 | 2011-03-30 | 鞍钢股份有限公司 | Method for preventing peritectic steel continuous casting billet from generating cracks |
| CN102688995B (en) * | 2012-06-13 | 2013-12-11 | 鞍钢股份有限公司 | Parameter control method for continuous casting crystallizer vibration table |
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