CN109351928A - A method of preventing hypo-peritectic steel surface longitudinal crack of slab - Google Patents
A method of preventing hypo-peritectic steel surface longitudinal crack of slab Download PDFInfo
- Publication number
- CN109351928A CN109351928A CN201811175943.2A CN201811175943A CN109351928A CN 109351928 A CN109351928 A CN 109351928A CN 201811175943 A CN201811175943 A CN 201811175943A CN 109351928 A CN109351928 A CN 109351928A
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- Prior art keywords
- crystallizer
- slab
- hypo
- longitudinal crack
- peritectic steel
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- 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
- B22D11/10—Supplying or treating molten metal
- B22D11/108—Feeding additives, powders, or the like
-
- 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
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/053—Means for oscillating the moulds
-
- 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
- B22D11/07—Lubricating the moulds
-
- 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
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
-
- 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
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The present invention relates to continuous casting technology field, in particular to a kind of method for preventing hypo-peritectic steel surface longitudinal crack of slab, comprising: in continuous casting process, viscosity is 0.08~0.14Pas when using basicity as 1.2~1.4,1300 DEG C covering slag；By crystallizer discharge reduction 5%~10%；28~35 DEG C of crystallizer inflow temperature of control；Crystallizer takes non-sinusoidal oscillation.The method provided in an embodiment of the present invention for preventing hypo-peritectic steel surface longitudinal crack of slab; the covering slag that viscosity is 0.08~0.14Pas when using basicity as 1.2~1.4,1300 DEG C; by crystallizer discharge reduction 5%~10%, 28~35 DEG C of crystallizer inflow temperature is controlled to prevent hypo-peritectic steel continuous casting billet surface cracked.After improving protection basicity of slag, the lubricating action of covering slag is reduced, therefore use the mode of vibration of non-sinusoidal oscillation and the small amplitude of high oscillation frequencies to reduce the negative slip time, to improve lubrication, hypo-peritectic steel surface longitudinal crack of slab can be effectively prevent.
Description
Technical field
The present invention relates to continuous casting technology field, in particular to a kind of method for preventing hypo-peritectic steel surface longitudinal crack of slab.
Background technique
The carbon containing steel 0.08%~0.16% is known as hypo-peritectic steel, and such steel is very easy to generate in continuous casting process to split
Line.The main reason for hypo-peritectic steel cracks has: δ occurs in peritectoid area (L+ δ → γ) when hypo-peritectic steel solidifiesFe→γFe
Phase transformation generates biggish volume contraction, makes solidified shell and copper plate of crystallizer be detached to form air gap, reduces green shell to crystallizer
Rate of heat transfer, green shell is thinning, surface formed be recessed.It is quiet in thermal stress, frictional force, molten steel since shell thickness is uneven
Under the effects of pressure, concentrates and crack in solidified shell most weakness stress.Green shell depression in the surface is deeper, and crackle occurs
The bigger probability the more serious；For peritectic steel in continuous casting process, the austenite grain of as cast condition steel is coarse, and continuous casting billet plasticity reduces, and generates
The tendency of face crack increases.
After peritectoid steel continuous casting billet forms fine crack in crystallizer, extended in secondary cooling zone and straightening section.Continuous casting billet surface
After there is deeper, longer crackle, later period artificial scafing is needed, finished product plate surface is cracked when serious, generates waste product.
The process that the prior art uses is mainly the crystalline state covering slag for using high alkalinity, reaches and slows down heat transfer and subtract
The purpose of few crackle.But excessively high percent crystallization in massecuite easily deteriorates slab lubrication state, leads to slab bonding and bleed-out.How to coordinate
The ratio of vitreum and crystalline solid, while realizing slow cooling and lubrication, at home and abroad all there are no obtain in many continuous castings for this
It properly settles.Even if simultaneously use high alkalinity covering slag, some enterprises still suffer from enters winter after lobe aggravate or control
The case where effect processed has a rebound.
Summary of the invention
The embodiment of the present invention solves existing skill by providing a kind of method for preventing hypo-peritectic steel surface longitudinal crack of slab
The technical issues of hypo-peritectic steel casting billet surface is easy to appear longitudinal crack in art.
The embodiment of the invention provides a kind of methods for preventing hypo-peritectic steel surface longitudinal crack of slab, comprising:
In continuous casting process, viscosity is 0.08~0.14Pas when using basicity as 1.2~1.4,1300 DEG C protection
Slag；
By crystallizer discharge reduction 5%~10%；
28~35 DEG C of crystallizer inflow temperature of control；
Crystallizer takes non-sinusoidal oscillation.
Further, the covering slag includes: CaO:35~41%, SiO2: 26~32%, MgO:0~4%, Al2O3:1
~5%, C:4~8% and F:7~11%.
Further, it is described by crystallizer discharge reduction 5%~10% include: control crystallizer broadside water flow velocity be 8.0
~9.0m/s；Control mould at narrow water flow velocity is 10.0~11.0m/s.
Further, when the crystallizer takes non-sinusoidal oscillation, the vibration frequency for controlling the crystallizer is 140~
160min-1, amplitude is 6.0~8.0mm, and the negative slip time is 0.09-0.11s.
Further, the continuous casting billet with a thickness of 230mm, conticaster pulling rate is 0.9~1.4m/min.
One or more technical solutions provided in an embodiment of the present invention, at least have following beneficial effect or advantage:
The method provided in an embodiment of the present invention for preventing hypo-peritectic steel surface longitudinal crack of slab, use basicity for 1.2~
1.4,1300 DEG C when viscosity be 0.08~0.14Pas covering slag, by crystallizer discharge reduction 5%~10%, control crystallization
28~35 DEG C of device inflow temperature prevents hypo-peritectic steel continuous casting billet surface cracked.After improving protection basicity of slag, reduce
The lubricating action of covering slag, therefore when using the mode of vibration of non-sinusoidal oscillation and the small amplitude of high oscillation frequencies to reduce negative slip
Between, to improve lubrication, hypo-peritectic steel surface longitudinal crack of slab can be effectively prevent.
Detailed description of the invention
Fig. 1 is the method flow diagram provided in an embodiment of the present invention for preventing hypo-peritectic steel surface longitudinal crack of slab.
Specific embodiment
The embodiment of the present invention solves existing skill by providing a kind of method for preventing hypo-peritectic steel surface longitudinal crack of slab
The technical issues of hypo-peritectic steel casting billet surface is easy to appear longitudinal crack in art.
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Whole description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
The embodiment of the present invention, every other reality obtained by those of ordinary skill in the art without making creative efforts
Example is applied, shall fall within the protection scope of the present invention.
Referring to Fig. 1, the embodiment of the invention provides a kind of methods for preventing hypo-peritectic steel surface longitudinal crack of slab, comprising:
Step S10, in continuous casting process, viscosity is 0.08~0.14Pas when using basicity as 1.2~1.4,1300 DEG C
Covering slag.Basicity R=CaO (content)/SiO of covering slag2(content).
Step S20, by crystallizer discharge reduction 5%~10%.
Step S30,28~35 DEG C of crystallizer inflow temperature are controlled.To be kept for inflow temperature winter to increase crystallizer water inlet
The steam rates being blended into.
Step S40, control crystallizer takes non-sinusoidal oscillation.
In a specific embodiment provided by the invention, covering slag includes: CaO:35~41%, SiO2: 26~32%, MgO:
0~4%, Al2O3: 1~5%, C:4~8% and F:7~11%.
In a specific embodiment provided by the invention, crystallizer water is realized by control broadside water flow velocity and narrow side water flow velocity
Amount reduces 5%~10%, specifically includes: control 8.0~9.0m/s of broadside water flow velocity；10.0~11.0m/s of narrow side water flow velocity.
In a specific embodiment provided by the invention, the vibration frequency of crystallizer is 140~160min-1, amplitude be 6.0~
8.0mm, negative slip time are 0.09-0.11s, non-sine coefficient 0.7.
Wherein, vibration frequency, amplitude are related to pulling rate, are calculated using following formula:
S=3.0+3.2 × VCAnd f=165-15 × VC；
Wherein, f is vibration frequency, and unit is secondary/min；S is amplitude, unit mm；VCFor pulling rate, unit m/min.It is non-just
The negative slip time t of Chord vibrationNCalculation formula are as follows:
Wherein, α is waveform deviation proportion, is equal to (non-sine coefficient -0.5)/0.5.
In a specific embodiment provided by the invention, thickness of strand 230mm, conticaster pulling rate is 0.9~1.4m/
min。
The method provided in an embodiment of the present invention for preventing hypo-peritectic steel surface longitudinal crack of slab is suitable for thickness 230mm, draws
The continuous casting process of 0.9~1.4m/min of speed, the asking with effective solution hypo-peritectic steel surface longitudinal crack of slab of the method
Topic improves slab quality, reduces slab cleaning quantity and quantity scrapped, has significant economic benefit.
Specific embodiments of the present invention will be further explained below:
Embodiment 1
The present embodiment carbon content of molten steel C=0.101%, the protection slag ingredient and physical property of use are as shown in table 1.
Table 1
Wherein, Casting speed 1.3m/min；Casting blank specification is 230*1550mm；Crystallizer broadside jet density is
3660L/min, water flow velocity 9m/s；Mould at narrow jet density is 500L/min, water flow velocity 11m/s；Crystallizer water inlet
Temperature is 30.9 DEG C.Crystallizer takes non-sinusoidal oscillation: amplitude 7.2mm, and vibration frequency is 146min-1, negative slip time 0.105s.
Obvious longitudinal crack is not found using the casting billet surface that the continuous cast method of embodiment 1 produces.
Embodiment 2
The present embodiment carbon content of molten steel C=0.127%, the protection slag ingredient and physical property of use are as shown in table 2.
Table 2
Wherein, Casting speed 1.2m/min, casting blank specification 230*1650mm；Crystallizer broadside jet density is
4400L/min, water flow velocity 8.2m/s；Mould at narrow jet density is 460L/min, water flow velocity 10.1m/s；Crystallizer
Inflow temperature is 31.8 DEG C.Crystallizer takes non-sinusoidal oscillation: amplitude 6.8mm, and vibration frequency is 147min-1, the negative slip time
0.105s。
Obvious longitudinal crack is not found using the casting billet surface that the continuous cast method of embodiment 2 produces.
Embodiment 3
The present embodiment carbon content of molten steel C=0.089%, the protection slag ingredient and physical property of use are shown in Table 3.
Table 3
Wherein, Casting speed 0.9m/min, casting blank specification 230*1950mm；Crystallizer broadside jet density is
4400L/min, water flow velocity 8.2m/s；Mould at narrow jet density is 460L/min, water flow velocity 10.1m/s；Crystallizer
Inflow temperature is 30.7 DEG C.Crystallizer takes non-sinusoidal oscillation: amplitude 5.9mm, and vibration frequency is 152min-1, the negative slip time is
0.104s。
Obvious longitudinal crack is not found using the casting billet surface that the continuous cast method of embodiment 3 produces.
Embodiment 4
The present embodiment carbon content of molten steel C=0.15%, the protection slag ingredient and physical property of use are as shown in table 4.
Table 4
Wherein, Casting speed 1.3m/min, casting blank specification 230*1150mm；Crystallizer broadside jet density is
3660L/min, water flow velocity 9m/s；Mould at narrow jet density is 500L/min, water flow velocity 11m/s；Crystallizer water inlet
Temperature is 29.8 DEG C.Crystallizer takes non-sinusoidal oscillation: amplitude 7.2mm, and vibration frequency is 146min-1, negative slip time 0.105s.
Obvious longitudinal crack is not found using the casting billet surface that the continuous cast method of embodiment 4 produces.
One or more technical solutions provided in an embodiment of the present invention, at least have following beneficial effect or advantage:
The method provided in an embodiment of the present invention for preventing hypo-peritectic steel surface longitudinal crack of slab, use basicity for 1.2~
1.4,1300 DEG C when viscosity be 0.08~0.14Pas covering slag, by crystallizer discharge reduction 5%~10%, control crystallization
28~35 DEG C of device inflow temperature prevents hypo-peritectic steel continuous casting billet surface cracked.After improving protection basicity of slag, reduce
The lubricating action of covering slag, therefore when using the mode of vibration of non-sinusoidal oscillation and the small amplitude of high oscillation frequencies to reduce negative slip
Between, to improve lubrication, hypo-peritectic steel surface longitudinal crack of slab can be effectively prevent.
It should be noted last that the above specific embodiment is only used to illustrate the technical scheme of the present invention and not to limit it,
Although being described the invention in detail referring to example, those skilled in the art should understand that, it can be to the present invention
Technical solution be modified or replaced equivalently, without departing from the spirit and scope of the technical solution of the present invention, should all cover
In the scope of the claims of the present invention.
Claims (5)
1. a kind of method for preventing hypo-peritectic steel surface longitudinal crack of slab characterized by comprising
In continuous casting process, viscosity is 0.08~0.14Pas when using basicity as 1.2~1.4,1300 DEG C covering slag；
By crystallizer discharge reduction 5%~10%；
28~35 DEG C of crystallizer inflow temperature of control；
Crystallizer takes non-sinusoidal oscillation.
2. the method according to claim 1 for preventing hypo-peritectic steel surface longitudinal crack of slab, which is characterized in that the protection
Slag includes: CaO:35~41%, SiO2: 26~32%, MgO:0~4%, Al2O3: 1~5%, C:4~8% and F:7~11%.
3. the method according to claim 1 for preventing hypo-peritectic steel surface longitudinal crack of slab, which is characterized in that described to tie
Brilliant device discharge reduction 5%~10%, comprising: control crystallizer broadside water flow velocity is 8.0~9.0m/s；Control mould at narrow water
Flow velocity is 10.0~11.0m/s.
4. the method according to claim 1 for effectivelying prevent hypo-peritectic steel surface longitudinal crack of slab, which is characterized in that knot institute
When stating brilliant device and taking non-sinusoidal oscillation, the vibration frequency for controlling the crystallizer is 140~160min-1, amplitude is 6.0~8.0mm, is born
The slippage time is 0.09-0.11s.
5. the method according to claim 1 for preventing hypo-peritectic steel surface longitudinal crack of slab, which is characterized in that the company
Slab thickness is 230mm, and conticaster pulling rate is 0.9~1.4m/min.
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| CN201811175943.2A CN109351928A (en) | 2018-10-10 | 2018-10-10 | A method of preventing hypo-peritectic steel surface longitudinal crack of slab |
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| CN201811175943.2A CN109351928A (en) | 2018-10-10 | 2018-10-10 | A method of preventing hypo-peritectic steel surface longitudinal crack of slab |
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Cited By (6)
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| CN111761039A (en) * | 2019-04-01 | 2020-10-13 | 南京钢铁股份有限公司 | Longitudinal crack control process for wide slab |
| CN112605360A (en) * | 2020-11-27 | 2021-04-06 | 马鞍山钢铁股份有限公司 | High-pulling-speed production method of sub-peritectic steel slab |
| CN112743053A (en) * | 2020-12-29 | 2021-05-04 | 马鞍山钢铁股份有限公司 | Crystallizer for solving peritectic steel continuous casting slab surface cracks and control method |
| CN110695325B (en) * | 2019-10-22 | 2021-07-23 | 首钢集团有限公司 | Continuous casting method of sub-peritectic steel slab |
| CN113198995A (en) * | 2021-04-25 | 2021-08-03 | 芜湖新兴铸管有限责任公司 | Peritectic steel continuous casting billet depression improvement control method |
| CN115138815A (en) * | 2022-05-20 | 2022-10-04 | 天铁热轧板有限公司 | Method for controlling longitudinal crack of continuous casting cast-on slab |
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| CN111761039A (en) * | 2019-04-01 | 2020-10-13 | 南京钢铁股份有限公司 | Longitudinal crack control process for wide slab |
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| CN112743053A (en) * | 2020-12-29 | 2021-05-04 | 马鞍山钢铁股份有限公司 | Crystallizer for solving peritectic steel continuous casting slab surface cracks and control method |
| CN113198995A (en) * | 2021-04-25 | 2021-08-03 | 芜湖新兴铸管有限责任公司 | Peritectic steel continuous casting billet depression improvement control method |
| CN115138815A (en) * | 2022-05-20 | 2022-10-04 | 天铁热轧板有限公司 | Method for controlling longitudinal crack of continuous casting cast-on slab |
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