CN102699298A - Method for effectively controlling surface crack on continuous casting extra thick slab - Google Patents
Method for effectively controlling surface crack on continuous casting extra thick slab Download PDFInfo
- Publication number
- CN102699298A CN102699298A CN2012102198107A CN201210219810A CN102699298A CN 102699298 A CN102699298 A CN 102699298A CN 2012102198107 A CN2012102198107 A CN 2012102198107A CN 201210219810 A CN201210219810 A CN 201210219810A CN 102699298 A CN102699298 A CN 102699298A
- Authority
- CN
- China
- Prior art keywords
- air pressure
- continuous casting
- cooling jet
- pressure
- cooling
- 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
Abstract
The invention discloses a method for effectively controlling surface crack on continuous casting extra thick slab, and belongs to the technical field of steel making-continuous casting. The extra thick slab is produced by a straight arc-shaped slab continuous casting machine; air pressure and water pressure of a secondary cooling jet are 0-0.2MPa and 0.2-2.0MPa respectively; the air pressure and the water pressure of the cooling jet at the vertical section are 0.3-0.6MPa and 0.3-0.8MPa respectively; the air pressure and the water pressure of the cooling jet at the curved section are 0.2-0.5MPa and 0.25-0.75MPa respectively; the air pressure and the water pressure of the cooling jets at the arc-shaped section and the straightened section are 0.15-0.45MPa and 0.2-0.7MPa respectively; and the air pressure and the water pressure of the cooling jet at the horizontal section are 0.1-0.35MPa and 0.1-0.6MPa respectively. The method disclosed by the invention has the advantages that the cooling efficiency is improved and meanwhile uniformity of temperature of the casting slab is improved. Moreover, the method can greatly improve the defect of the surface crack caused by heat stress and straightening force of the casting machine.
Description
Technical field
The invention belongs to the steel smelting-continuous casting technical field, a kind of method of effective control extra-thick plate blank face crack is provided.
Background technology
The continuous casting extra-thick plate blank typically refers to thickness greater than the continuous casting billet more than the 330mm, slab thickness cause greatly casting process curved-to rectify the stress ratio sheet billet much bigger, occurs mass defects such as slab surface crack more easily, especially with microalloy words steel for very.Control extra-thick plate blank face crack is the common problem of domestic and international each iron and steel enterprise, also is a difficult problem of generally acknowledging in the industry.
Forefathers' research shows that the situation of cc billet surface quality and the cooling of continuous casting secondary is closely related, and reasonably secondary cooling system is the key that guarantees continuous casting billet quality.Take place for fear of crackle, the casting blank surface temperature in two cold leveling districts will be avoided the 3rd brittleness temperature district of this steel grade as far as possible.Simultaneously, the two cold strand widths that require cool off as far as possible evenly, to prevent owing to the local thermal stress in width aspect causes the crackle generation.In addition, continuous casting two cold also requires higher cooling effectiveness, makes the evenly reasonably growth of base shell in solidifying whole process of high temperature strand.To sum up visible, in order to obtain the second best in quality strand, continuous casting two cold is important controlling unit.
Bibliographical information shows that secondary cooling nozzle of continuous casting adopts the air water nozzle can improve the strand cooling effect, improve the uniformity of strand cooling zone.Research points out, when the hot plate surface temperature greater than 300 ℃, the cooling water of injection can keep well contacting with the base face, heat-transfer effect is higher; When the hot plate surface temperature greater than 300 ℃, form steam blanket on hot plate surface, the unique channel that at this time improves cooling effectiveness is exactly the impact velocity that improves water droplet and keep certain water droplet granularity.Continuous casting steel billet surface temperature in casting process improves certain impact velocity and water droplet granularity that cooling effectiveness must keep di-cold spray nozzle all greater than 300 ℃, and this directly is decided by to get into the gas pressure of nozzle and the pressure of cooling water.Therefore the gas, the water pressure that combine the diverse location of casting process strand that di-cold spray nozzle is set are important problems.
All documents do not have the di-cold spray nozzle gas of each cold-zone section of continuous casting, system's report of water pressure at present.
Summary of the invention
The object of the present invention is to provide a kind of method of effective control continuous casting extra-thick plate blank face crack, can make that the continuous casting extra-thick plate blank changes steadily at throwing direction casting blank surface temperature, the width surface temperature evenly, improve cooling effectiveness.
The extra-thick plate blank that the present invention relates to is the production of straight arc billet continuous casting machine, and di-cold spray nozzle gas, water pressure are: the air pressure of sufficient roller cooling jet is that 0～0.2Mpa, hydraulic pressure are 0.2～2.0Mpa; Vertical section cooling jet air pressure is that 0.3～0.6Mpa, hydraulic pressure are 0.3～0.8Mpa; Bending section cooling jet air pressure is that 0.2～0.5Mpa, hydraulic pressure are 0.25～0.75Mpa; Segmental arc and aligning section cooling jet air pressure are 0.15～0.45, hydraulic pressure is 0.2～0.7Mpa; Horizontal segment cooling jet air pressure is that 0.1～0.35Mpa, hydraulic pressure are 0.1～0.6Mpa.
The present invention has combined the actual conditions of continuous casting extra-thick plate blank at sufficient roller section, vertical section, bending section, segmental arc and each position casting blank surface temperature of horizontal segment of continuous casting; Take into full account the ability that nozzle gas, water pressure are abolished steam blanket to the effect and the water droplet hitting power of cooling water atomizing, when improving cooling effectiveness, improved the uniformity of strand temperature.To having that thermal stress causes and huge improvement effect being arranged by the surface crack defect that the casting machine straightening force causes.
The specific embodiment
Embodiment 1
Certain steel mill is when cast 400mm * 2000mm specification deck of boat steel continuous casting billet, and each cooling section nozzle gas of continuous casting, water pressure are set to: the air pressure of sufficient roller cooling jet is 0, hydraulic pressure is 0.8Mpa; Vertical section cooling jet air pressure is that 0.5Mpa, hydraulic pressure are 0.6Mpa; Bending section cooling jet air pressure is that 0.35Mpa, hydraulic pressure are 0.5Mpa; Segmental arc is that 0.3Mpa, hydraulic pressure are 0.5Mpa with aligning section cooling jet air pressure; Horizontal segment cooling jet air pressure is 0.2, hydraulic pressure is 0.3Mpa.Cc billet surface quality is intact, does not have surface crack defect.
Embodiment 2
Certain steel mill is when cast 350mm * 2400mm specification deck of boat steel continuous casting billet, and each cooling section nozzle gas of continuous casting, water pressure are set to: the air pressure of sufficient roller cooling jet is 0, hydraulic pressure is 0.6Mpa; Vertical section cooling jet air pressure is that 0.45Mpa, hydraulic pressure are 0.5Mpa; Bending section cooling jet air pressure is that 0.3Mpa, hydraulic pressure are 0.35Mpa; Segmental arc is that 0.25Mpa, hydraulic pressure are 0.3Mpa with aligning section cooling jet air pressure; Horizontal segment cooling jet air pressure is that 0.2Mpa, hydraulic pressure are 0.25Mpa.Cc billet surface quality is intact, does not have surface crack defect.
Embodiment 3
Certain steel mill is when cast 350mm * 1800mm specification deck of boat steel continuous casting billet, and each cooling section nozzle gas of continuous casting, water pressure are set to: the air pressure of sufficient roller cooling jet is 0.05, hydraulic pressure is 0.5Mpa; Vertical section cooling jet air pressure is that 0.35Mpa, hydraulic pressure are 0.35Mpa; Bending section cooling jet air pressure is that 0.25Mpa, hydraulic pressure are 0.3Mpa; Segmental arc is that 0.2Mpa, hydraulic pressure are 0.25Mpa with aligning section cooling jet air pressure; Horizontal segment cooling jet air pressure is that 0.1Mpa, hydraulic pressure are 0.2Mpa.Cc billet surface quality is intact, does not have surface crack defect.
Claims (1)
1. effective method of control continuous casting extra-thick plate blank face crack, described extra-thick plate blank is the production of straight arc billet continuous casting machine; It is characterized in that di-cold spray nozzle gas, water pressure are: the air pressure of sufficient roller cooling jet is that 0～0.2Mpa, hydraulic pressure are 0.2～2.0Mpa; Vertical section cooling jet air pressure is that 0.3～0.6Mpa, hydraulic pressure are 0.3～0.8Mpa; Bending section cooling jet air pressure is that 0.2～0.5Mpa, hydraulic pressure are 0.25～0.75Mpa; Segmental arc and aligning section cooling jet air pressure are 0.15～0.45, hydraulic pressure is 0.2～0.7Mpa; Horizontal segment cooling jet air pressure is that 0.1～0.35Mpa, hydraulic pressure are 0.1～0.6Mpa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102198107A CN102699298A (en) | 2012-06-29 | 2012-06-29 | Method for effectively controlling surface crack on continuous casting extra thick slab |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102198107A CN102699298A (en) | 2012-06-29 | 2012-06-29 | Method for effectively controlling surface crack on continuous casting extra thick slab |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102699298A true CN102699298A (en) | 2012-10-03 |
Family
ID=46892516
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012102198107A Pending CN102699298A (en) | 2012-06-29 | 2012-06-29 | Method for effectively controlling surface crack on continuous casting extra thick slab |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102699298A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104399923A (en) * | 2014-11-18 | 2015-03-11 | 钢铁研究总院 | Method for producing ultra-thick plate continuous casting blank |
| CN104942255A (en) * | 2015-07-23 | 2015-09-30 | 东北大学 | Liquid steel continuous casting secondary cooling method with niteogen-water spray cooling |
| CN108145110A (en) * | 2017-11-24 | 2018-06-12 | 南阳汉冶特钢有限公司 | It is a kind of to reduce the cracked production technology of billet rolling steel plate |
| CN109136742A (en) * | 2018-07-13 | 2019-01-04 | 舞阳钢铁有限责任公司 | S355G8+M-Z35 super thick ultra-wide continuous casting billet and its production method |
| CN115747659A (en) * | 2022-11-29 | 2023-03-07 | 湖南华菱湘潭钢铁有限公司 | Production method of large-piece-weight extra-thick continuous casting slab for wind power |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1631575A (en) * | 2004-12-31 | 2005-06-29 | 北京科技大学 | Method for controlling continuous casting slab trigon crack |
| DE102008004911A1 (en) * | 2008-01-18 | 2009-07-23 | Sms Demag Ag | Method for controlling the secondary cooling of continuous casting plants |
-
2012
- 2012-06-29 CN CN2012102198107A patent/CN102699298A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1631575A (en) * | 2004-12-31 | 2005-06-29 | 北京科技大学 | Method for controlling continuous casting slab trigon crack |
| DE102008004911A1 (en) * | 2008-01-18 | 2009-07-23 | Sms Demag Ag | Method for controlling the secondary cooling of continuous casting plants |
Non-Patent Citations (7)
| Title |
|---|
| 《冶金设备》 20030425 岑贞位 连铸二冷水气_水平衡分析 21-24 1 , 第02期 * |
| 刘欣: "150 mm×150 mm方坯连铸二次冷却工艺的优化", 《特殊钢》 * |
| 吾塔等: "八钢连铸板坯三角区裂纹形成及控制措施", 《新疆钢铁》 * |
| 岑贞位: "连铸二冷水气―水平衡分析", 《冶金设备》 * |
| 梅国晖等: "气水雾化喷嘴最佳气水比的确定", 《钢铁钒钛》 * |
| 郭强等: "济钢4~#板坯连铸机二冷配水自动控制系统应用研究", 《工业计量》 * |
| 韩春良等: "承钢方坯连铸机二次冷却系统的优化", 《河北冶金》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104399923A (en) * | 2014-11-18 | 2015-03-11 | 钢铁研究总院 | Method for producing ultra-thick plate continuous casting blank |
| CN104942255A (en) * | 2015-07-23 | 2015-09-30 | 东北大学 | Liquid steel continuous casting secondary cooling method with niteogen-water spray cooling |
| CN104942255B (en) * | 2015-07-23 | 2017-01-11 | 东北大学 | Liquid steel continuous casting secondary cooling method with niteogen-water spray cooling |
| CN108145110A (en) * | 2017-11-24 | 2018-06-12 | 南阳汉冶特钢有限公司 | It is a kind of to reduce the cracked production technology of billet rolling steel plate |
| CN108145110B (en) * | 2017-11-24 | 2019-11-22 | 南阳汉冶特钢有限公司 | It is a kind of to reduce the cracked production technology of billet rolling steel plate |
| CN109136742A (en) * | 2018-07-13 | 2019-01-04 | 舞阳钢铁有限责任公司 | S355G8+M-Z35 super thick ultra-wide continuous casting billet and its production method |
| CN115747659A (en) * | 2022-11-29 | 2023-03-07 | 湖南华菱湘潭钢铁有限公司 | Production method of large-piece-weight extra-thick continuous casting slab for wind power |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102699298A (en) | Method for effectively controlling surface crack on continuous casting extra thick slab | |
| CN101585077B (en) | Cooling method for preventing microcracks on wheel steel continuous casting slabs | |
| CN101890437B (en) | After-rolling cooling system for hot rolled steel strip production line | |
| CN100475385C (en) | Straight arc casting machine alloy steel sheet billet continuous casting foot roller segment narrow surface cooling method | |
| CN103464708B (en) | A kind of cooling twice arrangement of nozzles method that blank plates of silicon steels continuous casting is produced | |
| CN102228968B (en) | Method for implementing direct conveying and charging of high-strength low alloy steel continuously-cast slab | |
| CN102168227B (en) | Super-thick quenched-tempered steel plate with 60kg-grade tensile strength and production method of the super-thick quenched-tempered steel plate | |
| CN104525560A (en) | Effective control method for pitted surface of plain carbon steel/Nb-containing steel plate of 20-30 mm thickness | |
| CN103600049B (en) | A kind of technique controlling and improve mould steel continuous casting heavy slab internal soundness | |
| CN103111464B (en) | Manufacturing method of super-thick steel plate | |
| CN104399923A (en) | Method for producing ultra-thick plate continuous casting blank | |
| WO2018072550A1 (en) | Continuous casting process for producing 450 mm ultra-thick blank on straight arc continuous casting machine | |
| CN102989763A (en) | Production method of four-segment high-strength aseismic reinforcement | |
| CN201380275Y (en) | Plate blank continuous casting crystallizer | |
| CN104962814A (en) | Normalized extra-thick plate with high strength and toughness and thickness of 150mm and method for manufacturing normalized extra-thick plate | |
| CN111761039A (en) | Longitudinal crack control process for wide slab | |
| CN208390657U (en) | A kind of process equipment improving rebar surface corrosion resistance | |
| CN103611907A (en) | Comprehensive control method of medium-carbon niobium-containing steel narrow face lateral fissure of thick plate blank | |
| CN102632206B (en) | Novel environment-friendly and safe heating device for burial pits and method | |
| CN102303104A (en) | Method for controlling narrow side bulging in continuous casting of ultra-thick plate blanks | |
| CN103056175B (en) | Alternative cooling control method of hot rolling H-section steel flange | |
| CN103433447A (en) | Secondary cooling system for square billet continuous casting working region | |
| CN103357675B (en) | Hot rolled H-shaped cold bed aerosol cooling method and device thereof | |
| CN109957639A (en) | A kind of surface treatment method of continuous casting billet | |
| CN102699299B (en) | Method for producing high-quality extra thick slab through complete gas atomization secondary cooling mode |
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 |
Application publication date: 20121003 |