CN107081413B - The method for improving Steels for High Rise Buildings continuous casting billet central dense degree - Google Patents
The method for improving Steels for High Rise Buildings continuous casting billet central dense degree Download PDFInfo
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- CN107081413B CN107081413B CN201710214110.1A CN201710214110A CN107081413B CN 107081413 B CN107081413 B CN 107081413B CN 201710214110 A CN201710214110 A CN 201710214110A CN 107081413 B CN107081413 B CN 107081413B
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000009749 continuous casting Methods 0.000 title claims abstract description 22
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 20
- 239000010959 steel Substances 0.000 title claims abstract description 20
- 230000000994 depressogenic effect Effects 0.000 claims abstract description 14
- 238000007711 solidification Methods 0.000 claims abstract description 14
- 230000008023 solidification Effects 0.000 claims abstract description 14
- 238000009826 distribution Methods 0.000 claims abstract description 13
- 238000005266 casting Methods 0.000 claims abstract description 12
- 239000007787 solid Substances 0.000 claims abstract description 11
- 238000001816 cooling Methods 0.000 claims abstract description 9
- 239000002184 metal Substances 0.000 claims abstract description 8
- 230000000694 effects Effects 0.000 abstract description 3
- 230000007547 defect Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000000881 depressing effect Effects 0.000 description 4
- 238000007689 inspection Methods 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 229910000746 Structural steel Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
- B22D11/20—Controlling or regulating processes or operations for removing cast stock
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The invention discloses a kind of methods for improving Steels for High Rise Buildings continuous casting billet central dense degree, and in the continuous casting process, control casting machine pulling rate is 0.75m/min~0.90m/min；Using under solidification end weight；It is controlled using dynamic secondary cooling, while being depressed under weight by distribution solid rate using slighter compress；20 DEG C~30 DEG C of the Metal in Tundish degree of superheat of control.This method is mainly to reduce the center porosity of Gao Jiangang slab by stablizing the technical measures integrated uses such as casting machine pulling rate, the reduction tundish degree of superheat, two cold dynamics controls, solidification end weight press control, and then slab central dense degree is improved, improve stocking internal soundness.The slab produced using this method, effect is better than existing soft reduction technique after implementation, and central dense degree is higher, and total quality is good, can meet the requirement of Gao Jiangang well.
Description
Technical field
The present invention relates to a kind of continuous cast method, especially a kind of side for improving Steels for High Rise Buildings continuous casting billet central dense degree
Method.
Background technique
Steels for High Rise Buildings abbreviation Gao Jiangang, it has the performances such as antidetonation, high tenacity, low-temperature impact resistance, is mainly used in
The large-scale construction engineerings such as skyscraper, airport and steel-structure factory building, Q460GJC steel are one such.Gao Jiangang will be born
The effect of the complicated applied force, impact flexibility and anti-lamellar tearing of skyscraper, so it is non-to the quality requirement of slab and stocking
Chang Yange especially must assure that the central dense degree of slab and stocking, reduces center porosity, is otherwise just difficult to ensure Gao Jiangang
Safe mass problem.Therefore, it eliminates slab center porosity and improves slab central dense degree and have to such steel grade of continuous casting
It is of great importance.
Patent application CN201510183899.X " a method of eliminate slab center porosity and improve slab consistency "
, pressure roller is arranged at continuous casting machine fan-shaped segment rear keeps the deflection in the middle part of slab big by changing the setting position of pressure roller
In surface, slab central porisity is eliminated, slab center porosity problem is reduced, improves the consistency at slab center.This side
Method has certain benefit mainly for conventional plate blank, to the improvement of common slab quality, carries out big pressure at fan-shaped section rear and holds
Slab easily is cracked, and is not proposed for the central dense degree of wide and thick slab or low-alloy high-tensile structural steel wide and thick slab
Technical measures.
Patent application CN201510788995.7 " a kind of method of big cross section Properties of Heavy Rail Steel slab center porosity control ", control
The degree of superheat of Zhi Zhong Baogang liquid；In normal casting process, pulling rate is controlled；It is depressed in casting process in solidification end；If
Determine the stirring intensity and stirring frequency of M-EMS；Set the stirring intensity and stirring frequency of solidification end；Control knot
Brilliant device cooling water inflow and Water Rate for Secondary Cooling Water.It can effectively be controlled using the center porosity of the big cross section heavy rail steel billet of this method production
System, remaining internal soundness of slab can obtain effective guarantee.The method changes Properties of Heavy Rail Steel quality mainly for big cross section Properties of Heavy Rail Steel
It is kind to have certain benefit, do not propose that technology is arranged for the central dense degree of wide and thick slab or low-alloy high-tensile structural steel wide and thick slab
It applies.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of sides for improving Steels for High Rise Buildings continuous casting billet central dense degree
Method.
In order to solve the above technical problems, the technical solution used in the present invention is: in continuous casting process, control casting machine pulling rate is
0.75m/min~0.90m/min；Using under solidification end weight；It is controlled using dynamic secondary cooling, while using slighter compress and weight
Under by distribution solid rate depressed；20 DEG C~30 DEG C of the Metal in Tundish degree of superheat of control.
Under solidification end weight of the present invention: Soft reduction rate 0.03mm/s, pressure range length be 6.0m~
10.0m, single roller maximum reduction are 15mm.
It is of the present invention to be depressed by distribution solid rate: under weight when the fs=0.9 depress, drafts is up to
20mm。
The beneficial effects of adopting the technical scheme are that the present invention is mainly by stablizing casting machine pulling rate, drop
The low tundish degree of superheat, two cold dynamics controls, solidification end weigh the technical measures integrated uses such as press control to reduce Gao Jiangang
The center porosity of slab, and then slab central dense degree is improved, improve stocking internal soundness.Using slab produced by the invention,
Effect is better than existing soft reduction technique after implementation, and central dense degree is higher, and total quality is good, can meet Gao Jiangang well
Requirement.
Specific embodiment
The present invention will be further described in detail below with reference to specific embodiments.
The method of this raising Steels for High Rise Buildings continuous casting billet central dense degree is as described below: (1) in continuous casting process, control casting
Machine pulling rate is 0.75m/min~0.90m/min.
(2) using solidification end weight Reduction Technology, Soft reduction rate 0.03mm/s, pressure range length be 6.0m~
10.0m, lower roll position is constant when pressure, and only upper roller is pressed downward, and single roller maximum reduction is 15mm.
(3) use dynamic secondary cooling control technology, by control pulling rate come dynamically adjust the water distribution quantity in each two cold subregions come
Realize dynamic secondary cooling；Simultaneously using slighter compress under weight described in step (2) by distribute solid rate depressed, under weight from
Start to depress when the solid rate fs=0.9 of slab center, the maximum reduction under entire weight is 20mm；Slighter compress drafts is
9mm。
(4) 20 DEG C~30 DEG C of the continuous casting process Metal in Tundish degree of superheat are controlled.
Embodiment 1: the method for this raising Steels for High Rise Buildings continuous casting billet central dense degree uses following techniques.
Continuous casting cross dimension is the Q460GJC Gao Jiangang of 1800mm × 260mm, and casting machine pulling rate is 0.88m/min,
And it is constant to keep pulling rate to stablize, the Metal in Tundish degree of superheat is 20 DEG C；Using dynamic secondary cooling control technology, it is based on steel grade and pulling rate
Dynamically to adjust the water distribution quantity in each two cold subregions.It is depressed simultaneously under weight by distribution solid rate using slighter compress, weight
It is depressed depressing when fs=0.9；Using solidification end weight press control, Soft reduction rate 0.03mm/s, pressure range is long
Degree is 10m；Overall reduction 28.89mm, the drafts 0.14mm of 8 sections of slighter compress, the drafts 2.59mm of 9 sections of slighter compress, 10 sections
The drafts 4.50mm of slighter compress, the drafts 1.77mm of 11 sections of slighter compress, the drafts 4.83mm under 11 sections of weight, 12 sections of weights
The drafts 9.99mm of pressure, the drafts 5.07mm under 13 sections of weight.
After being poured, macroscopic examination is carried out to Q460GJC Gao Jiangang Inner Quality of Billet, inspection result shows slab
Lateral low power is rated≤1.0 grades without obvious shrinkage porosite, centre burst defect, center porosity defect.
Embodiment 2: the method for this raising Steels for High Rise Buildings continuous casting billet central dense degree uses following techniques.
Continuous casting cross dimension is the Q460GJC Gao Jiangang of 1800mm × 265mm, and casting machine pulling rate is 0.87m/min,
And it is constant to keep pulling rate to stablize, the Metal in Tundish degree of superheat is 20 DEG C；Using dynamic secondary cooling control technology, it is based on steel grade and pulling rate
Dynamically to adjust the water distribution quantity in each two cold subregions.It is depressed simultaneously under weight by distribution solid rate using slighter compress, weight
It is depressed depressing when fs=0.9；Using solidification end weight press control, Soft reduction rate 0.03mm/s, pressure range is long
Degree is 8m；Overall reduction 23.90mm, the drafts 1.79mm of 8 sections of slighter compress, the drafts 3.21mm of 9 sections of slighter compress, 10 sections gently
The drafts 4.0mm of pressure, the drafts 3.60mm under 10 sections of weight, the drafts 7.50mm under 11 sections of weight, 12 sections of weight
Under drafts 3.80mm, the drafts 0mm under 13 sections of weight.
After being poured, macroscopic examination is carried out to Q460GJC Gao Jiangang Inner Quality of Billet, inspection result shows slab
Lateral low power non-stop layer shrinkage porosite ratio is increased to 100% by 51%, and center porosity defect is rated≤1.0 grades of ratios and is improved by 60%
To 100%, the ratio of center segregation≤0.5 grade is increased to 100% by 60%.
Embodiment 3: the method for this raising Steels for High Rise Buildings continuous casting billet central dense degree uses following techniques.
Continuous casting cross dimension is the Q460GJC Gao Jiangang of 1800mm × 265mm, and casting machine pulling rate is 0.75m/min,
And it is constant to keep pulling rate to stablize, the Metal in Tundish degree of superheat is 30 DEG C；Using dynamic secondary cooling control technology, it is based on steel grade and pulling rate
Dynamically to adjust the water distribution quantity in each two cold subregions.It is depressed simultaneously under weight by distribution solid rate using slighter compress, weight
It is depressed depressing when fs=0.9；Using solidification end weight press control, Soft reduction rate 0.03mm/s, pressure range is long
Degree is 8m, overall reduction 23.90mm；The drafts 2.04mm of 8 sections of slighter compress, the drafts 2.73mm of 9 sections of slighter compress, 10 sections gently
The drafts 4.23mm of pressure, the drafts 3.88m under 10 sections of weight, the drafts 8.24mm under 11 sections of weight, 12 sections of weight
Under drafts 2.78mm, the drafts 0mm under 13 sections of weight.
After being poured, macroscopic examination is carried out to Q460GJC Gao Jiangang Inner Quality of Billet, inspection result shows slab
Lateral low power is rated≤1.0 grades without obvious shrinkage porosite, centre burst defect, center porosity defect.
Embodiment 4: the method for this raising Steels for High Rise Buildings continuous casting billet central dense degree uses following techniques.
Continuous casting cross dimension is the Q460GJC Gao Jiangang of 1800mm × 260mm, and casting machine pulling rate is 0.90m/min,
And it is constant to keep pulling rate to stablize, the Metal in Tundish degree of superheat is 25 DEG C；Using dynamic secondary cooling control technology, it is based on steel grade and pulling rate
Dynamically to adjust the water distribution quantity in each two cold subregions.It is depressed simultaneously under weight by distribution solid rate using slighter compress, weight
It is depressed depressing when fs=0.9；Using solidification end weight press control, Soft reduction rate 0.03mm/s, pressure range is long
Degree is 10m, overall reduction 29mm；The drafts 1.06mm of 8 sections of slighter compress, the drafts 2.04mm of 9 sections of slighter compress, 10 sections are gently pressed
Under drafts 3.87mm, the drafts 2.03mm of 11 sections of slighter compress, the drafts 5.23mm under 11 sections of weight, under 12 sections of weight
Drafts 9.53mm, the drafts 5.24mm under 13 sections of weight.
After being poured, macroscopic examination is carried out to Q460GJC Gao Jiangang Inner Quality of Billet, inspection result shows slab
Lateral low power is rated≤1.0 grades without obvious shrinkage porosite, centre burst defect, center porosity defect.
Claims (1)
1. a kind of method for improving Steels for High Rise Buildings continuous casting billet central dense degree, it is characterised in that: in continuous casting process, control casting
Machine pulling rate is 0.75m/min~0.90m/min；Using under solidification end weight；It is controlled using dynamic secondary cooling, while using light pressure
It is lower to be depressed under weight by distribution solid rate, under weight when the solid rate fs=0.9 of slab center depress, entirely weigh
The overall reduction of pressure is 14.9~20mm；Slighter compress overall reduction is 9mm；Control the Metal in Tundish degree of superheat 20 DEG C~30
℃；The Steels for High Rise Buildings is Q460GJC Gao Jiangang, and slab thickness is 260~265mm；Under the solidification end weight: pressure
Lower rate is 0.03mm/s, and pressure range length is 6.0m~10.0m, and single roller maximum reduction is 15mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710214110.1A CN107081413B (en) | 2017-04-01 | 2017-04-01 | The method for improving Steels for High Rise Buildings continuous casting billet central dense degree |
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| JP7124353B2 (en) * | 2018-03-09 | 2022-08-24 | 日本製鉄株式会社 | Continuous casting method and continuous casting machine |
| CN114101605B (en) * | 2021-11-24 | 2023-05-12 | 山东钢铁集团日照有限公司 | Method for improving low-power quality of continuous casting blank for wide and thick plate |
| CN114653907B (en) * | 2022-03-26 | 2023-09-29 | 中天钢铁集团有限公司 | Method for improving homogeneity of high-carbon steel billet casting blank based on brand new depressing mode |
| CN114682746A (en) * | 2022-04-07 | 2022-07-01 | 首钢京唐钢铁联合有限责任公司 | Production method of super-thick steel plate |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH01178356A (en) * | 1987-12-29 | 1989-07-14 | Nkk Corp | Continuous casting method |
| DE19903928A1 (en) * | 1998-11-06 | 2000-05-11 | Schloemann Siemag Ag | Production of continuously cast slabs comprises using a solidifying cord shell in a cord guide extending from the mold to the final solidification point |
| CN102189237B (en) * | 2008-12-30 | 2013-04-17 | 内蒙古包钢钢联股份有限公司 | System integration technology for dynamic soft reduction of continuously-cast billet |
| CN201913211U (en) * | 2010-12-15 | 2011-08-03 | 鞍钢股份有限公司 | Device for improving internal structure of slab |
| CN102310178A (en) * | 2011-07-08 | 2012-01-11 | 南阳汉冶特钢有限公司 | Method for solving center segregation of casting blank |
| CN102921914B (en) * | 2012-12-01 | 2014-06-04 | 新余钢铁集团有限公司 | Heavy reduction technology for improving center segregation and center porosity of super-thick slabs |
| CN103878331A (en) * | 2014-03-27 | 2014-06-25 | 中国重型机械研究院股份公司 | Sector segment structure capable of compositely pressing continuous casting solidification tail end of extra-thick plate |
| CN104001891B (en) * | 2014-06-17 | 2016-08-31 | 中冶连铸技术工程有限责任公司 | On-Line Control Method under a kind of continuous small-billet casting dynamic soft-reduction and weight |
| CN105598407B (en) * | 2016-03-04 | 2018-01-26 | 攀钢集团攀枝花钢铁研究院有限公司 | The method for improving strand central dense degree |
| CN106001476B (en) * | 2016-07-14 | 2017-10-31 | 东北大学 | A kind of method under the continuous dynamic weight of continuous casting billet two benches |
| CN106513612A (en) * | 2016-11-16 | 2017-03-22 | 攀钢集团攀枝花钢铁研究院有限公司 | Heavy rail steel continuous casting method |
| CN106475542A (en) * | 2016-11-16 | 2017-03-08 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of axle steel and its continuous cast method |
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