CN1974059A - Method of controlling cracks in triangular area of continuously cast slab - Google Patents
Method of controlling cracks in triangular area of continuously cast slab Download PDFInfo
- Publication number
- CN1974059A CN1974059A CN 200610137894 CN200610137894A CN1974059A CN 1974059 A CN1974059 A CN 1974059A CN 200610137894 CN200610137894 CN 200610137894 CN 200610137894 A CN200610137894 A CN 200610137894A CN 1974059 A CN1974059 A CN 1974059A
- Authority
- CN
- China
- Prior art keywords
- triangular area
- roller section
- crack
- slab
- cast slab
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Continuous Casting (AREA)
Abstract
The present invention provides method of controlling cracks in triangular area of continuously cast slab. The first technological scheme of controlling cracks in triangular area is optimizing water amount and nozzle configuration to reduce the cooling nonuniformity in the width direction of the cast slab. The second technological scheme of controlling cracks in triangular area includes optimizing the conicity of the narrow side in the crystallizer and the opening of the support roller in the foot roller section and forced cooling the foot roller section. Specifically, The second technological scheme has the conicity of the narrow side in the crystallizer increased to 0.05-0.2 %, the opening of the support roller in the foot roller section increased by 0.5-1.0 mm and the cooling water amount in the foot roller section increased by 60-100 L/hr. The present invention can lower the crack rate to below 1.5 %.
Description
Technical field
The invention belongs to the sheet billet continuous casting technical field, a kind of method of controlling continuous casting slab trigon crack particularly is provided, be applicable to sheet billet continuous casting production.
Background technology
The hot rolled steel plate that is used for important use such as shipbuilding, high-pressure bottle, oil-gas pipeline, heavily loaded bridge, marine facility is very strict to the requirement of continuous casting steel billet underbead crack.Underbead crack comprises middle crack, center line crackle, subcrack and triangular area crack.For middle crack, existing both at home and abroad a lot of researchs.And to the research of triangular area crack seldom, lack effective control method in the actual production process.Common triangular area crack has two classes, sees Fig. 1.
The great-grandfather is modest, and (great-grandfather is modest, preventing of continuous casting steel billet internal fissure, steel-making, 1998, No.3:13-15) research is thought: two cold first section strand leptoprosopy intensities of cooling are too greatly the main causes that triangular area crack forms, and alleviate two cold first section intensities of cooling and can reduce triangular area crack.
Mei Feng (Mei Feng, literary composition brilliance, the origin cause of formation and the analysis of Nangang's slab triangular area crack, steel vanadium titanium, 2003,24 (1): 61-65) research is thought: the reason that triangular area crack forms is bad the causing of cooling of strand in sufficient roller district and the zero section cooling zone, and the two cold water distribution ratios of optimizing slab side and cambered surface can reduce triangular area crack.
Zhu Guosen, Wang Xinhua etc. are discovered (Guosen Zhu, Xinhua Wang, andHuixiang Yu, Formation mechanism of internal cracks in continuouslycast slab, Journal of University of Science and Technology Beijing, 2004,11 (5): 398) triangular area crack 1 is to cause owing to the inhomogeneous cooling of strand width is even.
Summary of the invention
The object of the present invention is to provide the method for control continuous casting slab trigon crack, solve the triangular area crack problem of continuous casting steel billet.
The present invention proposes to control triangular area crack 1 and is meant that at slab thickness direction center line, apart from the distance of leptoprosopy be the crackle of 50～150mm; Key problem in technology is to optimize the water yield and arrangement of nozzles, alleviates the inhomogeneities of strand width cooling.Concrete grammar is: at first, adopt discharge distribution tests instrument to set up total water current amount (500 liters/hour～2500 liters/hour), gas flow (800 liters/hour～3000 liters/hour), water pressure (0.05 MPa～0.7 MPa), gas pressure (0.4 MPa～1.0 MPas), nozzle model ((operating) water nozzle and aerial fog nozzle), (this database can be according to slab size ((200～230) millimeter * (1060～1550) millimeter) for the database that slab width discharge distributes under injector spacing (450 millimeters～600 millimeters) and nozzle height (150 millimeters～300 millimeters) condition, the total water current amount, gas flow, water pressure and gas pressure, discharge that retrieval is best and corresponding injector spacing and nozzle height thereof); Then, slab size, total water current amount, gas flow, water pressure, gas pressure and nozzle model are wanted in input, in above-mentioned database, select best discharge to distribute (deviation＜25% of discharge maximum and minimum of a value in 400～600 millimeters scopes in width of plate slab center), obtain its pairing injector spacing and nozzle height simultaneously; Then, by-pass valve control, it is consistent with the best water flow amount distribution of retrieving in database that discharge is distributed, and then, measures slab surface temperature under the above-mentioned best water flow amount distribution cooling condition; At last, detect the internal soundness of slab, slab crackle＜1.5%.
The key problem in technology that the present invention proposes to control triangular area crack 2 (crackle that is about 8～20mm apart from the distance of leptoprosopy) is to optimize mould at narrow tapering and sufficient roller section backing roll opening degree, and sufficient roller section adopts cold by force.Specific practice is: crystallizer leptoprosopy tapering is increased 0.05～0.2%, and sufficient roller section backing roll opening degree increases by 0.5～1.0 millimeter, and the water yield of sufficient roller section increases 60～100 liters/hour.
The invention has the advantages that: the triangular area crack incidence is reduced to below 1.5%.
Description of drawings
Fig. 1 is the triangular area crack schematic diagram.Wherein triangular area crack 1 is at slab thickness direction center line, be about 50～150mm apart from the distance of leptoprosopy; Triangular area crack 2 is about 8～20mm apart from the distance of leptoprosopy.
Fig. 2 is the schematic diagram of slab solidification end liquid core pattern.
Fig. 3 is for optimizing the distribution of back strand width secondary cooling water flow.Wherein, abscissa is the distance apart from the width of plate slab center, and the mm of unit, ordinate are discharge, the unit liter/hour.
Fig. 3 a is 230 * 1550 millimeters of slab sizes, discharge is 500 liters/hour, and gas flow is 800 liters/hour, and water pressure is 0.7 MPa, gas pressure is the distribution of best water flow amount under the 0.4 MPa condition, and this moment, the nozzle number was that 3, spacing are 500 millimeters, highly are 300 millimeters; Fig. 3 b is 230 * 1060 millimeters of slab sizes, and discharge is 500 liters/hour, and gas flow is 800 liters/hour, water pressure is 0.7 MPa, gas pressure is the distribution of best water flow amount under the 0.4 MPa condition, and this moment, the nozzle number was that 2, spacing are 600 millimeters, highly was 300 millimeters.
The specific embodiment
In control during triangular area crack 1, for 230 * 1550 millimeters slabs, when discharge is 500 liters/hour, gas flow is 800 liters/hour, and water pressure is 0.7 MPa, and gas pressure is that Fig. 3 a is seen in the distribution of best water flow amount under the 0.4 MPa condition; For 230 * 1060 millimeters slabs, when discharge is 500 liters/hour, gas flow is 800 liters/hour, and water pressure is 0.7 MPa, and gas pressure is that Fig. 3 b is seen in the distribution of best water flow amount under the 0.4 MPa condition.
When control triangular area crack 2, for 230 * 1550 millimeters slabs, crystallizer leptoprosopy tapering increases 0.1%, and sufficient roller section opening degree increases 0.8 millimeter, and sufficient roller section cooling water flow increases 80 liters/hour.
Claims (1)
1, a kind of method of controlling continuous casting slab trigon crack, it is characterized in that: the technical scheme of control triangular area crack (2) is to optimize mould at narrow tapering and sufficient roller section backing roll opening degree, foot roller section adopts cold by force, and triangular area crack (2) is the crackle that the distance of span leptoprosopy is about 8～20mm; Concrete grammar is: crystallizer leptoprosopy tapering is increased 0.05～0.2%, and sufficient roller section backing roll opening degree increases by 0.5～1.0 millimeter, and the water yield of sufficient roller section increases 60～100 liters/hour.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610137894 CN1974059A (en) | 2004-12-31 | 2004-12-31 | Method of controlling cracks in triangular area of continuously cast slab |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610137894 CN1974059A (en) | 2004-12-31 | 2004-12-31 | Method of controlling cracks in triangular area of continuously cast slab |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004101018954A Division CN1304143C (en) | 2004-12-31 | 2004-12-31 | Method for controlling continuous casting slab trigon crack |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1974059A true CN1974059A (en) | 2007-06-06 |
Family
ID=38124572
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610137894 Pending CN1974059A (en) | 2004-12-31 | 2004-12-31 | Method of controlling cracks in triangular area of continuously cast slab |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1974059A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107350446A (en) * | 2017-07-24 | 2017-11-17 | 中冶赛迪工程技术股份有限公司 | A kind of process for improving continuous casting slab trigon crack defect |
| CN112355265A (en) * | 2020-11-23 | 2021-02-12 | 福建三宝钢铁有限公司 | Continuous casting slab triangular region crack control method |
-
2004
- 2004-12-31 CN CN 200610137894 patent/CN1974059A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107350446A (en) * | 2017-07-24 | 2017-11-17 | 中冶赛迪工程技术股份有限公司 | A kind of process for improving continuous casting slab trigon crack defect |
| CN107350446B (en) * | 2017-07-24 | 2019-01-18 | 中冶赛迪工程技术股份有限公司 | A kind of process improving continuous casting slab trigon crack defect |
| CN112355265A (en) * | 2020-11-23 | 2021-02-12 | 福建三宝钢铁有限公司 | Continuous casting slab triangular region crack control method |
| CN112355265B (en) * | 2020-11-23 | 2021-07-30 | 福建三宝钢铁有限公司 | Continuous casting slab triangular region crack control method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1304143C (en) | Method for controlling continuous casting slab trigon crack | |
| CN101585077B (en) | Cooling method for preventing microcracks on wheel steel continuous casting slabs | |
| US7954539B2 (en) | Process and a plant for the production of metal strip | |
| KR101343464B1 (en) | Process and plant for producing metal strip | |
| CN102323388B (en) | Judging method for causing reason of straight crack at edge of rolling plate | |
| CN101147967A (en) | Method for cooling narrow surface of continuous casting foot roller section of low alloy steel plate blank of straight arc casting machine | |
| CN106180192A (en) | A kind of wire and rod continuous casting billet high speed direct sending directly rolls system and method | |
| CN102303102A (en) | Continuous casting process and continuous casting machine for extra-thick plate blank | |
| CN208528079U (en) | A kind of continuous casting production dam | |
| CN108405818B (en) | Device and process for improving corner structure plasticity of microalloyed steel sheet billet | |
| CN107552750A (en) | The multiple-strand caster and production method of large section Hot Metal in Beam Blank or slab can be produced | |
| CN101391264A (en) | Technique method of thin middle plate continuous casting and rolling production | |
| CN209520198U (en) | A kind of wire and rod continuous casting and rolling production line | |
| Hu et al. | Application of a chamfered mold to improve corner defects of HSLA during slab continuous casting | |
| CN114734014B (en) | Cooling method and system for controlling crack at corner of microalloy steel plate blank | |
| CN109365527B (en) | Rolling method of wide and thick steel plate with large spreading ratio | |
| CN1974059A (en) | Method of controlling cracks in triangular area of continuously cast slab | |
| CN107442756B (en) | The method for improving slab slighter compress efficiency | |
| Tao et al. | Longitudinal corner crack of chamfered slab and optimization of mould | |
| CN102303104A (en) | Method for controlling narrow side bulging in continuous casting of ultra-thick plate blanks | |
| CN112743053A (en) | Crystallizer for solving peritectic steel continuous casting slab surface cracks and control method | |
| CN207267037U (en) | A kind of multiple-strand caster for producing large section Hot Metal in Beam Blank or slab | |
| CN201455253U (en) | Novel molten steel tank tap hole seat brick | |
| CN111842484B (en) | Continuous casting slab hot core rolling method based on alternate work of two rollers | |
| CN104907513A (en) | Method for continuous casting of large rectangular billet of low-carbon hadifield steel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20070606 |