CN109277544A - A method of control high-carbon steel slab internal flaw - Google Patents
A method of control high-carbon steel slab internal flaw Download PDFInfo
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- CN109277544A CN109277544A CN201710601103.7A CN201710601103A CN109277544A CN 109277544 A CN109277544 A CN 109277544A CN 201710601103 A CN201710601103 A CN 201710601103A CN 109277544 A CN109277544 A CN 109277544A
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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
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
- B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level
- B22D11/182—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level by measuring temperature
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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
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
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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
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
-
- 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
-
- 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
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The present invention provides a kind of method for controlling high-carbon steel slab internal flaw.It is cooling by force that the method for the present invention includes (1): including crystallizer, cooling and secondary cooling zone high pressure water is cooled down by force by force；(2) high degree of superheat casting: Metal in Tundish is poured degree of superheat control within the scope of 25 ± 5 DEG C；(3) big soft reduction process state modulator: suitable heavy reduction is 6-10mm；Big depressing position is fs=0.5~0.8；Soft reduction rate is not less than 0.288mm/min, and the big pressure is to give certain mechanical drafts in casting blank solidification end to compensate the volume contraction of molten steel in solidification, reinforces feeding stowage capacity, controls green shell bulge.The present invention can be effectively controlled the internal flaws such as center segregation, center porosity and the underbead crack of high-carbon steel slab, mitigate the banded structure rank of high-carbon steel, so as to improve the mechanical property, forming property and processing performance of high carbon steel sheet.
Description
Technical field:
The present invention relates to a kind of methods for controlling high-carbon steel slab internal flaw, belong to continuous casting steel billet technique in Ferrous Metallurgy
Quality field.
Background technique:
High-quality high-carbon steel is widely used in the fastening of all kinds of tools, grinding tool, mechanical structure, spring, steel wire and middle high intensity
The purposes such as part, structural member are a kind of high attached value products, have a vast market foreground.With the hair of industrialization and modernization
Exhibition, requirement of the market to high-carbon steel quality are higher and higher, it is desirable that high-carbon steel has poker characteristic uniform, and decarburization is few, and tissue is main
It for sorbite, is not allow for martensite and network cementite exists, and desired strength is high, extends, good toughness, to adapt to cold-drawn
The needs of journey
High-carbon high-strength steel generally all contains higher carbon content and manganese content, and continuous casting billet is easily formed in process of setting
The dendritic segregation of the elements such as carbon, manganese causes steel plate to be centrally formed serious banded structure defect.Mechanics of the banded structure to steel plate
Performance, forming property and fracture behaviour can generate significant impact.For cold-rolled steel sheet, the presence of banded structure, it will
So that material is shown strong anisotropy energy, causes inhomogeneous deformation when deep processing, i.e., the longitudinal fiber along plate width direction
Extend inconsistent, formation secondary deformation, or even in stress raiser crack initiation source, influences the service performance of final products.Cause
This, in the segregation that how to mitigate and eliminate continuous casting billet to the maximum extent and generate in process of setting, is that continuous casting is urgently to be resolved
Problem.
Domestic common method is using traditional " three-lows " process route at present: i.e. low overheat, low pulling rate, low wash water
Continuous casting process increase equiaxed zone ratio, and use soft reduction technique reduce center segregation, but the center segregation of high-carbon high-strength steel, in
The heart is loose and the slabs internal flaw such as underbead crack is still very serious.And low pulling rate sets production efficiency lowly with conticaster
Standby well damage；Low overheat keeps organization of production and continuous casting difficult；Low wash water is that slab bulge is serious, and green shell is thin, bleed-out
Risk is big.
Summary of the invention
The purpose of the present invention is providing a kind of method for controlling high-carbon steel slab internal flaw in view of the above problems,
It can be effectively controlled the internal flaws such as center segregation, center porosity and the underbead crack of high-carbon steel slab, mitigate the band-like of high-carbon steel
Rank is organized, so as to improve the mechanical property, forming property and processing performance of high carbon steel sheet.Improve high-carbon steel product quality, drop
Low engineering safety hidden danger, benefits the country and people.
Above-mentioned purpose is achieved through the following technical solutions:
A method of control high-carbon steel slab internal flaw, this method comprises:
(1) strong cooling: including crystallizer, cooling and secondary cooling zone high pressure water is cooled down by force by force；
(2) high degree of superheat casting: Metal in Tundish is poured degree of superheat control within the scope of 25 ± 5 DEG C；
(3) big soft reduction process state modulator: suitable heavy reduction is 6-10mm；Big depressing position be fs=0.5~
0.8；Soft reduction rate is not less than 0.288mm/min, and the big pressure is given under certain machinery pressure in casting blank solidification end
It measures to compensate the volume contraction of molten steel in solidification, reinforces feeding stowage capacity, control green shell bulge, thus mitigate center porosity journey
Degree and and promote the soldering of internal fissure, obtain the effect for increasing the central dense degree of slab.
The method of the control high-carbon steel slab internal flaw, the specific process conditions cooling by force are: knot
Brilliant device uses parabolic taper: taper 2.3%/m at crystallizer meniscus, prostomum degree 1.1%/m under crystallizer；Crystallizer is cold
But the flow velocity of water, 7-10m/s；It is cold by force using high pressure water that slab goes out under crystallizer secondary cooling after mouth, and high-pressure water pressure 15~
20bar, high pressure water intensity of cooling 1.5-3.0l/min.
The utility model has the advantages that
1. the " three-lows " technique of existing low overheat, low pulling rate, low wash water, purpose inhibits column crystals growth, in expansion
The isometric crystalline region of the heart makes center segregation be distributed in entire isometric crystalline region, rather than central area." the high degree of superheat+strong cooling of the invention
The new process of+big pressure ", it is therefore an objective to promote slab center pillar crystals growth processed, slab is made to form columnar crystal structure completely, make
Heart segregation point is centrally located in very narrow range, improves the uniformity of steel solute concentration in a thickness direction.
2. can be effectively controlled center segregation, center porosity, the underbead crack etc. of high-carbon steel slab using method of the invention
Slab internal flaw, high-carbon steel central segregation of slab rank and high-carbon steel slab underbead crack defect are significantly improved.
It is substantially improved using the high-carbon steel slab internal soundness that new process of the present invention produces, mitigation high-carbon steel hot rolled steel plate is band-like significantly
Rank is organized, so as to improve the mechanical property, forming property and processing performance of high carbon steel sheet.High-carbon steel product quality is improved, is subtracted
Few high-carbon steel slab scrap with product quality objection, increase economic efficiency and product market reputation and occupation rate.
Detailed description of the invention
Fig. 1 degree of superheat is to equiax crystal influence curve.
The cold influence diagram to center segregation of Fig. 2 bis-.
Specific embodiment
With reference to embodiment, the present invention is furture elucidated, it should be understood that following specific embodiments are only used for
It is bright the present invention rather than limit the scope of the invention.
A method of control high-carbon steel slab internal flaw, this method comprises:
(1) strong cooling: including crystallizer, cooling and secondary cooling zone high pressure water is cooled down by force by force；The tool cooling by force
The process conditions of body are: crystallizer uses parabolic taper: taper 2.3%/m at crystallizer meniscus, prostomum under crystallizer
Spend 1.1%/m；The flow velocity of crystallizer cooling water, 7-10m/s；It is strong using high pressure water that slab goes out under crystallizer secondary cooling after mouth
It is cold, 15~20bar of high-pressure water pressure, high pressure water intensity of cooling 1.5-3.0l/min.Crystallizer is cooling using moisture film out, solidifies base
Thickness of the shell increase by 2 times, casting blank surface temperature drastically reduces to go up again, crystal boundary cementite almost eliminates (by force cold index of cementation be
125, tradition is cooled to > 220).Fig. 2 is the two cold influence castings to center segregation.Base center segregation be and solidification liquid phase socket end
The volume of mushy zone is related, this area's liquid metals is reached liquidus temperature, due to volume crystallization, concentrates and releases latent heat of solidification
It increases green shell temperature and bulging occurs, in addition volume contraction is wanted in whole crystallization, so contracting once swollen one causes solute mother liquor
Flowing, cause center gross segregation aggravate.Therefore with the increase of Water Rate for Secondary Cooling Water, Models For Secondary Dendrite Arm spacing reduces.Because
For light section slab, when intensity of cooling is larger, casting blank solidification fast speed easily generates the closely spaced solidified structure of dendrite,
So cold strong cold playing the role of refining crystal grain using two.It is provided with simultaneously in solidification end and forces water-spraying control area, Qiang Leng
Increase green shell intensity, be compacted slab core, center segregation and loose is greatly improved.
(2) high degree of superheat casting: Metal in Tundish is poured degree of superheat control within the scope of 25 ± 5 DEG C；Target superheat degree 25
DEG C, Fig. 1 is influence of the molten steel overheat to slab Center Equiaxial Crystal area, and the high degree of superheat reduces Center Equiaxial Crystal area.Make center
Segregation point is centrally located in very narrow range, improves the uniformity of steel solute concentration in a thickness direction.Can avoid because
Inclusion floating is difficult in molten steel caused by pouring temperature is too low, covering slag lack of fusion, in the even casting of middle water-coating port dross
The problems such as disconnected.
(3) big soft reduction process state modulator: the big pressure is given under certain machinery pressure in casting blank solidification end
It measures to compensate the volume contraction of molten steel in solidification, reinforces feeding stowage capacity, control green shell bulge, thus mitigate center porosity journey
Degree and and promote the soldering of internal fissure, obtain the effect for increasing the central dense degree of slab, calculated by SOLIDIFICATION MODEL it is found that most
Good big pressure initial position should be at critical feeding solid rate, and optimal pressure final position then should be critical flow solid phase
At rate.Less than critical feeding solid rate, therefore depressing will not only be such that center segregation is improved at this time, but also if depress
Mutually upstream reflux causes the center solid rate of this position to be promoted rapidly to ambassador's central liquid, once it is more than critical feeding solid rate,
Small steel ingot is formed, and center cavity will be filled by interdendritic denseization molten steel and cause serious gross segregation.For high-carbon high strength steel plate
Base, suitable heavy reduction are 6-10mm；Big depressing position is fs=0.5~0.8；Soft reduction rate is not less than 0.288mm/min.
Claims (2)
1. a kind of method for controlling high-carbon steel slab internal flaw, it is characterized in that: this method comprises:
(1) strong cooling: including crystallizer, cooling and secondary cooling zone high pressure water is cooled down by force by force；
(2) high degree of superheat casting: Metal in Tundish is poured degree of superheat control within the scope of 25 ± 5 DEG C；
(3) big soft reduction process state modulator: suitable heavy reduction is 6-10mm；Big depressing position is fs=0.5~0.8；Pressure
Lower rate is not less than 0.288mm/min, and the big pressure is to give certain mechanical drafts in casting blank solidification end to mend
The volume contraction of molten steel in solidification is repaid, feeding stowage capacity is reinforced, controls green shell bulge, thus mitigates center porosity degree and simultaneously
The soldering for promoting internal fissure obtains the effect for increasing the central dense degree of slab.
2. the method for control high-carbon steel slab internal flaw according to claim 1, it is characterized in that: the cooling by force
Specific process conditions are: crystallizer uses parabolic taper: taper 2.3%/m at crystallizer meniscus, mouth under crystallizer
Taper 1.1%/m；The flow velocity of crystallizer cooling water, 7-10m/s；It is strong using high pressure water that slab goes out under crystallizer secondary cooling after mouth
It is cold, 15~20bar of high-pressure water pressure, high pressure water intensity of cooling 1.5-3.0l/min.
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| CN201710601103.7A CN109277544A (en) | 2017-07-21 | 2017-07-21 | A method of control high-carbon steel slab internal flaw |
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| CN201710601103.7A CN109277544A (en) | 2017-07-21 | 2017-07-21 | A method of control high-carbon steel slab internal flaw |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111570741A (en) * | 2020-04-21 | 2020-08-25 | 河钢乐亭钢铁有限公司 | Casting blank quality control method combining continuous casting process and soft reduction technology |
| CN112872307A (en) * | 2021-02-26 | 2021-06-01 | 日照钢铁控股集团有限公司 | Production method for direct casting of high-carbon steel 45Mn |
| CN113385647A (en) * | 2021-06-15 | 2021-09-14 | 山西太钢不锈钢股份有限公司 | High-carbon high-manganese steel vertical bending type slab continuous casting method |
| CN117226059A (en) * | 2023-11-15 | 2023-12-15 | 北京科技大学 | Reduction control method for improving macro-segregation and semi-macro-segregation of high-carbon low-alloy steel |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111570741A (en) * | 2020-04-21 | 2020-08-25 | 河钢乐亭钢铁有限公司 | Casting blank quality control method combining continuous casting process and soft reduction technology |
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| CN112872307A (en) * | 2021-02-26 | 2021-06-01 | 日照钢铁控股集团有限公司 | Production method for direct casting of high-carbon steel 45Mn |
| CN112872307B (en) * | 2021-02-26 | 2022-07-26 | 日照钢铁控股集团有限公司 | Production method for direct casting of high-carbon steel 45Mn |
| CN113385647A (en) * | 2021-06-15 | 2021-09-14 | 山西太钢不锈钢股份有限公司 | High-carbon high-manganese steel vertical bending type slab continuous casting method |
| CN117226059A (en) * | 2023-11-15 | 2023-12-15 | 北京科技大学 | Reduction control method for improving macro-segregation and semi-macro-segregation of high-carbon low-alloy steel |
| CN117226059B (en) * | 2023-11-15 | 2024-01-26 | 北京科技大学 | Reduction control method for improving macro-segregation and semi-macro-segregation of high-carbon low-alloy steel |
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