CN104084552A - Continuous casting method - Google Patents
Continuous casting method Download PDFInfo
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- CN104084552A CN104084552A CN201410299728.9A CN201410299728A CN104084552A CN 104084552 A CN104084552 A CN 104084552A CN 201410299728 A CN201410299728 A CN 201410299728A CN 104084552 A CN104084552 A CN 104084552A
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- crystallizer
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Abstract
The invention discloses a continuous casting method. The method comprises the following steps of: pulling out a casting blank which is not completely solidified from a crystallizer which vibrates along a vertical direction, wherein the value A taking mm as a unit of the vibration amplitude of the crystallizer is equal to C1+C2*V, wherein C1 is 2-3, C2 is 3-4, and V is the value taking m/min as a unit of a pulling speed; the value f taking Hz as a unit of the vibration frequency of the crystallizer is equal to C3+C4*V, wherein C3 is 150-160, and C4 is minus 20-10. The vibration mark distance and vibration mark depth of a casting blank can be reduced by designing new crystallizer vibration parameters, thus the corner transverse crack rate and peeling defect rate of the produced casting blank can be reduced, and product quality can be improved.
Description
Technical field
The present invention relates to continuous casting technology field, particularly, relate to a kind of continuous cast method.
Background technology
Mold oscillation technology for CC is to affect the key technology that continuous casting billet is produced, and the differentiation each time of its vibrational waveform (rate curve) and development have all produced significant impact to continuous casting process and slab quality.Along with the development of continuous casting technology, more and more higher to the requirement of cc billet surface quality, strictly controlling depth of chatter mark is the main path that solves cc billet surface quality.
Mold oscillation improving lubrication of crystallizer, avoid bonding, improve pulling rate in, make also casting billet surface produce oscillation mark.Continuous casting billet transverse corner crack line often occurs in oscillation mark trough place, in the time that oscillation mark is dark, easily produces transverse corner crack line at trough place.This is that strand inner arc side is subject to tensile stress because strand is in the time aligning, and oscillation mark trough place stress is comparatively concentrated, and is filled with covering slag at oscillation mark trough place, causes cooling velocity herein to reduce, and solidified structure is thick, and base shell intensity is low.Oscillation mark trough place is often again the cradle of precipitate simultaneously, and micro alloying element is as very large on the fragility impact in low-temperature thermoplastic district in S, Al, V, N etc.When casting blank surface temperature is lower than 800 DEG C in addition, because austenite grain boundary is separated out ferrite, this process promotes separating out of AlN and other carbonitride simultaneously, increases the fragility of steel.
In view of this, need to provide a kind of and can reduce the continuous cast method that continuous casting billet corner crack generates.
Summary of the invention
Problem to be solved of the present invention is to provide a kind of continuous cast method that can reduce the generation of continuous casting billet corner crack.
In order to address the above problem, the invention provides a kind of continuous cast method, the method comprises pulls out the strand not solidifying completely from the crystallizer of vertically vibration, and wherein, the numerical value of the amplitude of described crystallizer taking mm as unit is A=C
1+ C
2v, wherein, C
1for 2-3, C
2for 3-4, the numerical value of the pulling rate that V is strand taking m/min as unit, the numerical value of the vibration frequency of described crystallizer taking Hz as unit is f=C
3+ C
4v, wherein, C
3for 150-160, C
4for-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 crystallizer
5-0.5), C wherein
5for the non-sine factor, C
5for 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, oscillation mark spacing and the depth of chatter mark of strand can be reduced, thereby transverse corner crack line rate, the peeling ratio of defects of the strand of production can be reduced, improve the quality of products.
Other features and advantages of the present invention are described in detail the detailed description of the invention part subsequently.
Detailed description of the invention
Below the specific embodiment of the present invention is elaborated.Should be understood that, detailed description of the invention described herein only, for description and interpretation the present invention, is not limited to the present invention.
The invention provides a kind of continuous cast method, the method comprises pulls out the strand not solidifying completely from the crystallizer of vertically vibration, and wherein, the numerical value of the amplitude of described crystallizer taking mm as unit is A=C
1+ C
2v, wherein, C
1for 2-3, C
2for 3-4, the numerical value of the pulling rate that V is strand taking m/min as unit, the numerical value of the vibration frequency of described crystallizer taking Hz as unit is f=C
3+ C
4v, wherein, C
3for 150-160, C
4for-20-10.
Crystallizer is accepted the molten steel injecting from pans and is made it section configuration in accordance with regulations and is frozen into firm base shell, and crystallizer is by vibrating so that strand pulls out smoothly by withdrawal straightening machine, avoids bonding.In the solution of the present invention, according to frequency and the amplitude of the pulling rate crystallization control device vibration of withdrawal straightening machine, optimize the vibration mode of crystallizer, reduce oscillation mark spacing and the depth of chatter mark of strand, thereby reduce its corner and transverse crack rate and peeling ratio of defects, improved product quality.
In the vibration processes of crystallizer, the oscillation mark spacing of strand is main relevant with vibration frequency and pulling rate, and the numerical value of oscillation mark spacing taking mm as unit is L=1000V/f.By the vibration parameters of preferred crystallizer, can under the prerequisite that ensures slab quality, allow slightly to improve the pulling rate of described strand, particularly, the pulling rate of described strand is 0.7-1.2m/min.
In addition, the waveform deviation proportion a=2 (C of the non-sinusoidal oscillation curve of described crystallizer
5-0.5), C wherein
5for the non-sine factor, C
5for 0.5-0.7.Be set to non-sinusoidal oscillation curve by the oscillating curve of described structure device, can shorten the negative slip time, reduce depth of chatter mark.Particularly, negative slip time t=60 (1-a) arccos[1000 (1-a) V/ (π 2Af)]/π f, visible, negative slip time t reduces along with the increase of waveform deviation proportion a, therefore adopts non-sinusoidal oscillation curve to contribute to reduce the negative slip time.
In addition, continuous cast method of the present invention can be applied to the production of large section casting blank, and particularly, the section of described strand is (950～1930) mm × 230mm;
Embodiment
By concrete production instance, continuous cast method of the present invention is described below.Continuous cast method of the present invention goes for producing most of steel grades, especially, is applicable to produce low-alloy steel, below as an example of SAPH440 steel grade and pipe line steel X60 example, continuous cast method of the present invention is described, and chemical constituent is as follows,
SAPH440
Pipe line steel X60
Embodiment 1
Produce SAPH440 steel grade, casting blank section is 950mm × 230mm, and vibration parameters is set to C
1=2, C
2=3, C
3=150, C
4=10, C
5=0.7, V=1.2m/min, can obtain thus, and amplitude is A=5.6mm, and vibration frequency is f=162Hz, and oscillation mark spacing is L=7.4mm, can obtain by detecting, and the transverse corner crack line rate of producing strand is 0.12%, and peeling ratio of defects is 2.58%.
Embodiment 2
Produce SAPH440 steel grade, casting blank section is 1550mm × 230mm, and vibration parameters is set to C
1=2.5, C
2=4, C
3=154, C
4=-5, C
5=0.5, V=1.0m/min, can obtain thus, and amplitude is A=6.5mm, and vibration frequency is f=149Hz, and oscillation mark spacing is L=6.7mm, can obtain by detecting, and the transverse corner crack line rate of 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, vibration parameters is set to C
1=3, C
2=3.5, C
3=160, C
4=-20, C
5=0.6, V=0.7m/min, can obtain thus, and amplitude is A=2.45mm, and vibration frequency is f=148Hz, and oscillation mark spacing is L=4.7mm, can obtain by detecting, and the transverse corner crack line rate of producing strand is 0.20%, and peeling ratio of defects is 3.43%.
Embodiment 4
Produce SAPH440 steel grade, casting blank section is 1650mm × 230mm, and vibration parameters is set to C
1=3, C
2=3.5, C
3=160, C
4=-20, C
5=0.6, V=0.7m/min, can obtain thus, and amplitude is A=2.45mm, and vibration frequency is f=148Hz, and oscillation mark spacing is L=4.7mm, can obtain by detecting, and the transverse corner crack line rate of 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, vibration parameters is set to C
1=2.5, C
2=4, C
3=156, C
4=-5, C
5=0.5, V=1.0m/min, can obtain thus, and amplitude is A=6.5mm, and vibration frequency is f=151Hz, and oscillation mark spacing is L=6.6mm, can obtain by detecting, and the transverse corner crack line rate of 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, vibration parameters is set to C
1=2, C
2=3, C
3=150, C
4=10, C
5=0.7, V=1.2m/min, can obtain thus, and amplitude is A=5.6mm, and vibration frequency is f=162Hz, and oscillation mark spacing is L=7.4mm, can obtain by detecting, and the transverse corner crack line rate of producing strand is 0.13%, and peeling ratio of defects is 2.75%.
Before adopting continuous cast method of the present invention, in original continuous cast method, vibration parameters is set to C
1=1, C
2=5, C
3=140, C
4=20, C
5=0.8, the transverse corner crack line rate of producing strand is approximately 64%, and peeling ratio of defects is 26% left and right.As can be seen here, continuous cast method of the present invention and former continuous cast method ratio, improved the quality of production of strand significantly.
More than describe the preferred embodiment of the present invention in detail; but the present invention is not limited to the detail in above-mentioned embodiment, within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each concrete technical characterictic described in above-mentioned detailed description of the invention, in reconcilable situation, can combine by any suitable mode, for fear of unnecessary repetition, the present invention is to the explanation no longer separately of various possible combinations.
In addition, between various embodiment of the present invention, also can be combined, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (4)
1. a continuous cast method, the method comprises pulls out the strand not solidifying completely from the crystallizer of vertically vibration, it is characterized in that, and the numerical value of the amplitude of described crystallizer taking mm as unit is A=C
1+ C
2v, wherein, C
1for 2-3, C
2for 3-4, the numerical value of the pulling rate that V is strand taking m/min as unit, the numerical value of the vibration frequency of described crystallizer taking Hz as unit is f=C
3+ C
4v, wherein, C
3for 150-160, C
4for-20-10.
2. continuous cast method according to claim 1, is characterized in that, the pulling rate of described strand is 0.7-1.2m/min.
3. continuous cast method according to claim 1, is characterized in that, the waveform deviation proportion a=2 (C of the non-sinusoidal oscillation curve of described crystallizer
5-0.5), C wherein
5for the non-sine factor, C
5for 0.5-0.7.
4. continuous cast method according to claim 1, is characterized in that, the section of described strand is (950～1930) mm × 230mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410299728.9A CN104084552B (en) | 2014-06-27 | 2014-06-27 | A kind of continuous cast method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410299728.9A CN104084552B (en) | 2014-06-27 | 2014-06-27 | A kind of continuous cast method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104084552A true CN104084552A (en) | 2014-10-08 |
| CN104084552B CN104084552B (en) | 2016-11-09 |
Family
ID=51632369
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|---|---|---|---|
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109382493A (en) * | 2018-11-28 | 2019-02-26 | 攀钢集团攀枝花钢铁研究院有限公司 | A method of improving hot rolling acid-cleaning plate peeling defect |
| 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 |
Citations (6)
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| JPH05181736A (en) * | 1991-12-29 | 1993-07-23 | Nec Corp | Hypermedia system |
| CN1480273A (en) * | 2003-07-31 | 2004-03-10 | 任廷志 | Variable speed gear with nonsinusoidal vibration in continuous casting crystallizer |
| CN101337267A (en) * | 2008-08-13 | 2009-01-07 | 中冶连铸技术工程股份有限公司 | Plate-blank crystallizer hydraulic vibration device |
| CN101433948A (en) * | 2008-12-17 | 2009-05-20 | 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 blank from generating cracks |
| CN102688995A (en) * | 2012-06-13 | 2012-09-26 | 鞍钢股份有限公司 | Parameter control method for vibrating table of continuous casting crystallizer |
-
2014
- 2014-06-27 CN CN201410299728.9A patent/CN104084552B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05181736A (en) * | 1991-12-29 | 1993-07-23 | Nec Corp | Hypermedia system |
| CN1480273A (en) * | 2003-07-31 | 2004-03-10 | 任廷志 | Variable speed gear with nonsinusoidal vibration in continuous casting crystallizer |
| CN101337267A (en) * | 2008-08-13 | 2009-01-07 | 中冶连铸技术工程股份有限公司 | Plate-blank crystallizer hydraulic vibration device |
| CN101433948A (en) * | 2008-12-17 | 2009-05-20 | 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 blank from generating cracks |
| CN102688995A (en) * | 2012-06-13 | 2012-09-26 | 鞍钢股份有限公司 | Parameter control method for vibrating table of continuous casting crystallizer |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109382493A (en) * | 2018-11-28 | 2019-02-26 | 攀钢集团攀枝花钢铁研究院有限公司 | A method of improving hot rolling acid-cleaning plate peeling defect |
| 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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| CN104084552B (en) | 2016-11-09 |
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