CN1559723A - Technology of on-line control molten steel flow in crystallizer - Google Patents
Technology of on-line control molten steel flow in crystallizer Download PDFInfo
- Publication number
- CN1559723A CN1559723A CNA200410006369XA CN200410006369A CN1559723A CN 1559723 A CN1559723 A CN 1559723A CN A200410006369X A CNA200410006369X A CN A200410006369XA CN 200410006369 A CN200410006369 A CN 200410006369A CN 1559723 A CN1559723 A CN 1559723A
- Authority
- CN
- China
- Prior art keywords
- molten steel
- crystallizer
- flow field
- mouth
- river
- 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.)
- Granted
Links
Images
Landscapes
- Continuous Casting (AREA)
Abstract
A technique for in-line controlling the flowing of molten steel in crystallizer includes such steps as using CFX software to calculate the flow field of molten steel in crystallizer and to obtain the parameters necessary to calculate F number, calculating F number according to a known equation, creating a database containing flow fields and F numbers, and using Delphi language to develop an in-line control system.
Description
Technical field
The invention belongs to the continuous casting field, the technology that molten steel flows in a kind of On-line Control crystallizer particularly is provided, what this technology can prevent covering slag in the crystallizer is involved in, improves continuous casting billet quality.
Background technology
Water model test and The results of numerical simulation show: in the sheet billet continuous casting process, by the molten steel that submersed nozzle flows out, be divided into two shuntings up and down after arrival mould at narrow base shell is neighbouring, see Fig. 1.On the one hand, if the shunting that makes progress is excessive, the molten steel surface fails to be convened for lack of a quorum the protection slag particle is poured molten steel in the crystallizer, and the grown base shell of part is caught, and causes volume slag defective.On the other hand, if the shunting that makes progress is too small, crystallizer molten steel surface heat quantity not sufficient, the fusion of covering slag is also just bad, and meniscus place initial solidification shell causes defectives such as slab surface crack, slag inclusion easily also with regard to became uneven.As seen, the mobile control of molten steel in the crystallizer had crucial meaning.
For flowing of molten steel in the crystallization control device, NKK (NKK) is (at document: T.Teshima, M.Osame, K.Okimoto.Improvement of Surface Property ofSteel at High Casting Speed, 1988 Steelmaking ConferenceProceedings:111-118; And document: the hand ring is pretty male, Kubo Tian Chun, Suzuki is done male. the mobile To ぉ ょ Pot The casting condition influence of molten steel in continuous casting casting mold during ス ラ Block high-speed casting, iron と steel, 1992,79 (5): the 40-46 record) researched and proposed the upwards index one " F number " of branch amount of flow of the interior molten steel of reflection crystallizer, the F number is defined as:
Wherein, p is the density of molten steel, kg/m
3
Q is the flow of molten steel, m
3/ s;
V is the speed of molten steel bump mould at narrow, m/s;
θ is the angle of molten steel bump mould at narrow;
D is the distance between the rum point and the scope of freedom, m.
NKK finds and can control crystallizer volume slag by control F number, when the F numerical control is between 2～4, because the blemish of the cold-rolled steel sheet that crystallizer volume slag causes is minimum.
According to NKK to the definition of F number as can be known, desire is calculated the F number, and must at first obtain molten steel and flow to the impact velocity V that reaches base shell place, narrow limit, the molten steel depth D of collision angle θ and collision place, but V, θ and D can't learn in actual production.NKK once obtained the empirical equation that its No. 3 conventional slab casters calculate impact velocity V, collision angle θ and collision place molten steel depth D by water model test, but cover is used for the casting condition of factories such as domestic Baosteel, discovery can't be used (molten steel that for example, calculates flows to and reaches the narrow limit collision degree of depth even exceed liquid level).
Summary of the invention
The objective of the invention is to propose the new technology that molten steel flows in a kind of F of calculating number, the crystallization control device.
Comprise the interior flow field of molten steel system of flow field of molten steel, F logarithmic data storehouse and On-line Control crystallizer in the crystallizer.
Desire is calculated the F number, must at first obtain molten steel and flow to the stroke speed V, the projected angle of impact θ that reach mould at narrow base shell place and the rum point distance D apart from the molten steel surface.The present invention the has adopted mass computing hydrodynamics software CFX analog computation flow field (example is seen Fig. 2) of molten steel and obtained the necessary parameter of calculating F number on this basis in the crystallizer under the various process conditions: molten steel flows to the stroke speed V, the projected angle of impact θ that reach mould at narrow base shell place and the rum point distance D apart from the molten steel surface, and various process conditions are meant: pulling rate, side opening inclination angle, the mouth of a river, mouth of a river immersion depth, strand size; Then according to the computing formula of F number:
Obtain the F number under the different technical parameters combination; Wherein, p is the density of molten steel, kg/m
3, Q is the flow of molten steel, m
3/ s, V are the speed of molten steel bump mould at narrow, and m/s, θ are the angle of molten steel bump mould at narrow, and D is the distance between the rum point and the scope of freedom, m.Adopt the experimental technique of permutation and combination in the analog computation process, set up a database of containing flow field and F number.At last, the present invention has adopted the Delphi language development on-line control system of flow field of molten steel in the crystallizer, this software adopts WINDOWS interface (see figure 3), and the operator imports the flow field figure that casting process parameter (pulling rate, strand size, submersed nozzle side opening inclination angle and immersion depth etc.) back just can obtain molten steel in corresponding F number and the crystallizer.Unreasonable as the F number, operating personnel can change some parameter under control system instructs, make the F numerical control in zone of reasonableness; The given arbitrary rational F numerical value of operator can instead be found with it the combination of process parameters of coupling the most.
The concrete parameter of above-mentioned process conditions is: pulling rate: 0.8～2.0m/min, side opening inclination angle, the mouth of a river :-20～5 °, mouth of a river immersion depth: 120～350mm, strand size: (1000～1800) mm * 230mm.Side opening inclination angle, the mouth of a river is upwards for just, downwards for negative; Mouth of a river immersion depth is the distance of mouth of a river export center line-spacing mold liquid level.
The invention has the advantages that: significantly reduced the formation of defectives such as volume slag, slag inclusion, surface longitudinal crack, depression, improved slab quality.With the empirical equation that NKK obtains by water model experiment D, Ve and θ are carried out Calculation Method and compare, the casting process condition that this method is considered more comprehensively, the result is also more accurate.
Description of drawings
Fig. 1 is the schematic diagram that molten steel flows in the continuous cast mold.
Fig. 2 is the flow field figure of molten steel in the crystallizer, and its corresponding process conditions are: pulling rate be 1.2m/min, side opening inclination angle, the mouth of a river for-15 °, mouth of a river immersion depth be that 220mm, strand are of a size of 1400 * 230mm.
Fig. 3 is the user interface map of control software.
Fig. 4: the enforcement interface of control system, its process conditions: pulling rate is that 0.8m/min, side opening inclination angle, the mouth of a river are that 5 °, mouth of a river immersion depth are that 120mm, strand are of a size of 1000 * 230mm
Fig. 5: the enforcement interface of control system, its process conditions: pulling rate be 2.0m/min, side opening inclination angle, the mouth of a river for-20 °, mouth of a river immersion depth be that 350mm, strand are of a size of 1800 * 230mm
The specific embodiment
At first, adopt the experimental technique of permutation and combination, flow field by molten steel in the crystallizer under mass computing hydrodynamics software CFX analog computation table 1 process conditions has also obtained the necessary parameter of calculating F number on this basis: molten steel flows to the stroke speed V, the projected angle of impact θ that reach mould at narrow base shell place and the rum point distance D apart from the molten steel surface, then according to the computing formula of F number:
Obtain the F number under the different technical parameters combination, set up a database of containing interior flow field of molten steel of crystallizer and F number.
On the basis of this work, the present invention has adopted the Delphi language development on-line control system of flow field of molten steel in the crystallizer, this software adopts WINDOWS interface (see figure 3), and the operator imports the flow field figure that casting process parameter (pulling rate, strand size, submersed nozzle side opening inclination angle and immersion depth etc.) back just can obtain molten steel in corresponding F number and the crystallizer.Unreasonable as the F number, operating personnel can change some parameter under control system instructs, make the F numerical control in zone of reasonableness; The given arbitrary rational F numerical value of operator can instead be found with it the combination of process parameters of coupling the most.
Table 1 process conditions
| Influence factor | Level | ||||||||
| Crystallizer thickness, mm | ?????????????????????230 | ||||||||
| The crystallizer width, mm | ????1000 | ??????1200 | ??1400 | ??1600 | ??1800 | ||||
| Pulling rate, m/min | ????0.8 | ??1.0 | ??1.2 | ??1.4 | ??1.8 | ??2.0 | |||
| Side opening inclination angle, the mouth of a river, ° | ????5° | ??????0° | ??-10° | ??-15° | ??-20° | ||||
| Mouth of a river immersion depth, mm | ????120 | ??160 | ??200 | ?220 | ?250 | ?350 | |||
Annotate: side opening inclination angle in the mouth of a river is upwards for just, downwards for negative in the table; Mouth of a river immersion depth is the distance of mouth of a river export center line-spacing mold liquid level.
Fig. 2 is the exemplary plot of the interior flow field of molten steel of crystallizer under the wherein a kind of process conditions that calculate.(process conditions: pulling rate be 1.2m/min, side opening inclination angle, the mouth of a river for-15 °, mouth of a river immersion depth be that 220mm, strand are of a size of 1400 * 230mm).
Fig. 4: the enforcement interface of control system, its process conditions: pulling rate is that 0.8m/min, side opening inclination angle, the mouth of a river are that 5 °, mouth of a river immersion depth are that 120mm, strand are of a size of 1000 * 230mm
Fig. 5: the enforcement interface of control system, its process conditions: pulling rate be 2.0m/min, side opening inclination angle, the mouth of a river for-20 °, mouth of a river immersion depth be that 350mm, strand are of a size of 1800 * 230mm
Claims (2)
1, the technology that molten steel flows in a kind of On-line Control crystallizer, comprise flow field of molten steel in the crystallizer, flow field of molten steel system in F logarithmic data storehouse and the On-line Control crystallizer, it is characterized in that: the flow field of molten steel and obtained the necessary parameter of calculating F number on this basis in the crystallizer under the various process conditions of at first having adopted mass computing hydrodynamics software CFX analog computation: molten steel flows to the stroke speed V that reaches mould at narrow base shell place, projected angle of impact θ and rum point are apart from the distance D on molten steel surface, and various process conditions are meant: pulling rate, side opening inclination angle, the mouth of a river, mouth of a river immersion depth, the strand size; Then according to the computing formula of F number:
Obtain the F number under the different technical parameters combination; Wherein, ρ is the density of molten steel, kg/m
3, Q is the flow of molten steel, m
3/ s, V are the speed of molten steel bump mould at narrow, and m/s, θ are the angle of molten steel bump mould at narrow, and D is the distance between the rum point and the scope of freedom, m; Adopt the experimental technique of permutation and combination in the analog computation process, set up a database of containing flow field and F number; At last, the on-line control system of flow field of molten steel in the crystallizer that adopted the Delphi language development, this software adopts the WINDOWS interface, and the operator imports the flow field figure that just can obtain corresponding F number and the interior molten steel of crystallizer after the casting process parameter; Unreasonable when the F number, operating personnel can change some parameter under control system instructs, make the F numerical control in zone of reasonableness; The given rational F numerical value of operator can instead be found with it the combination of process parameters of coupling the most.
2, according to the described technology of claim 1, it is characterized in that: pulling rate is 0.8～2.0m/min, and side opening inclination angle, the mouth of a river is that 120～350mm, strand are of a size of (1000～1800) mm * 230mm for-20～5 °, mouth of a river immersion depth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200410006369XA CN100408228C (en) | 2004-03-01 | 2004-03-01 | Technology of on-line control molten steel flow in crystallizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200410006369XA CN100408228C (en) | 2004-03-01 | 2004-03-01 | Technology of on-line control molten steel flow in crystallizer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1559723A true CN1559723A (en) | 2005-01-05 |
| CN100408228C CN100408228C (en) | 2008-08-06 |
Family
ID=34439768
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200410006369XA Expired - Fee Related CN100408228C (en) | 2004-03-01 | 2004-03-01 | Technology of on-line control molten steel flow in crystallizer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100408228C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103743539A (en) * | 2013-12-20 | 2014-04-23 | 鞍钢股份有限公司 | Method for measurement of flow-field direction and intensity in crystallizer and flow-field intensity indicator |
| CN111515375A (en) * | 2020-06-09 | 2020-08-11 | 首钢集团有限公司 | Submersed nozzle and using method thereof |
-
2004
- 2004-03-01 CN CNB200410006369XA patent/CN100408228C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103743539A (en) * | 2013-12-20 | 2014-04-23 | 鞍钢股份有限公司 | Method for measurement of flow-field direction and intensity in crystallizer and flow-field intensity indicator |
| CN111515375A (en) * | 2020-06-09 | 2020-08-11 | 首钢集团有限公司 | Submersed nozzle and using method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100408228C (en) | 2008-08-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Yuan et al. | Study of transient flow and particle transport in continuous steel caster molds: Part II. Particle transport | |
| Thomas | Modeling of continuous casting defects related to mold fluid flow | |
| CN105665643B (en) | A kind of manufacture method of the oblique bed casting of 3D printing | |
| Ramos-Banderas et al. | Dynamics of two-phase downwards flows in submerged entry nozzles and its influence on the two-phase flow in the mold | |
| CN102319891B (en) | Gating system capable of effectively controlling air entrainment and slag entrainment and design method thereof | |
| Dojka et al. | Optimized gating system for steel castings | |
| CN103231031B (en) | Physical simulation method of flow field of continuous casting crystallizer considering vibration behaviors | |
| CN104959541A (en) | Pouring cup device used for iron mould-tectorial sand casting and pouring method | |
| CN1559723A (en) | Technology of on-line control molten steel flow in crystallizer | |
| CN108927493A (en) | A kind of aluminium alloy electric automobile inner-cooled machine shell cast shaping process | |
| CN207746381U (en) | A kind of aluminum alloy chassis hollow thin-wall fore sub frame metal gravity casting die | |
| CN110508792A (en) | A kind of casting method of the more material casting of lathe | |
| Zhang et al. | Numerical simulation on inclusion transport in continuous casting mold | |
| CN105562602B (en) | A kind of automobile brake disc casting mould and technique | |
| Cho et al. | Multiphase flow-related defects in continuous casting of steel slabs | |
| CN202726000U (en) | Simulation detecting and testing device for vibrating technical process of continuous casting crystallizer | |
| CN207746378U (en) | A kind of hollow thin-wall cast aluminium control arm metal gravity verts mold | |
| JP6818980B2 (en) | Bottom pouring ingot equipment | |
| Niyama | Computer-aided design for metal casting | |
| CN207746374U (en) | A kind of aluminum alloy chassis rear axle support metal gravity casting die | |
| Hajari et al. | Surface turbulence in a physical model of a steel thin slab continuous caster | |
| Hamill et al. | Computational fluid dynamics modelling of tundishes and continuous casting moulds | |
| CN108994270B (en) | Method for purifying molten steel at tail stage of ladle in continuous casting process | |
| Ojeda et al. | Model of thermal-fluid flow in the meniscus region during an oscillation cycle | |
| CN117463986B (en) | Method for improving castability of ultra-thick high-carbon 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 | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080806 Termination date: 20110301 |