CN104399929A - Method for reducing longitudinal division of weather-proof steel continuously cast slab - Google Patents
Method for reducing longitudinal division of weather-proof steel continuously cast slab Download PDFInfo
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- CN104399929A CN104399929A CN201410708324.0A CN201410708324A CN104399929A CN 104399929 A CN104399929 A CN 104399929A CN 201410708324 A CN201410708324 A CN 201410708324A CN 104399929 A CN104399929 A CN 104399929A
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- crystallizer
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- covering slag
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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
Abstract
The invention provides a method for reducing longitudinal division of a weather-proof steel continuously cast slab. The control performed in a technological process is that casting is performed at a low molten steel superheat degree and a higher slab pulling rate, wherein the temperature of cooling water at an inlet of a crystallizer is improved in a casting process, and the taper of the crystallizer is increased; the alkalinity of covering slag is improved to be within a range of 1.40-1.50; the viscosity eta of the covering slag is reduced to be within the range of 0.70-0.80 at the temperature of 1,300 DEG C. According to the method for reducing the longitudinal division of the weather-proof steel continuously cast slab, the longitudinal division of the weather-proof steel continuously cast slab can be reduced to be below 0.82 percent from 2.75 percent, and considerable economic benefit can be achieved.
Description
Technical field
The present invention relates to continuous casting technology field, particularly a kind of method reducing weathering steel continuous casting steel billet lobe.
Background technology
Longitudinal crack is one of common blemish of continuous casting billet, occurs that the strand of such defect must roll off the production line reconditioning, have impact on rhythm of production, and serious longitudinal crack can make monoblock slab scrap, in continuous casting production process, even cause lobe bleed-out accident.Longitudinal Surface Cracks comes from the inhomogeneities of initial solidification shell growth near crystallizer meniscus, on strand width, when the thermal stress suffered by the base shell that local location relative thin is weak and various transformation stress are beyond its working strength, longitudinal crack just starts to occur, and solidifying with in cooling procedure in follow-up, this longitudinal crack also can further expand.
A lot of research was had about lobe Producing reason; be summed up and mainly contain: the aspects such as the composition of molten steel and castability, crystallizer cooling condition, submerged entry nozzle, covering slag and continuous casting process operating parameter; different factories, different conticasters and cast section are in the different stages; because condition is different, each factor is also changing strand lobe effect.For lobe problem; the improving environment of process aspect comprises: the control of molten steel composition; the optimization of covering slag performance; the optimization of gate structure; the improvement etc. of level control technology, although the generation that can reduce lobe, because continuous casting production process various factors all can change; as nozzle clogging blocks the generation that the flow field change that causes or the change of molten steel condition all likely cause lobe, be therefore difficult to the generation of thoroughly stopping lobe.
At present; the control of longitudinal crack is mainly carried out from submersed nozzle, covering slag and crystallizer three aspects, the concrete measure that continuous casting is produced comprises gate structure and immersion depth optimization, liquid level fluctuation of crystallizer controls, mold flux property optimization and stabilisation, crystallizer cooling and vibration optimization etc.But for the steel grade that some crack sensitivities are high, comprise low-alloy high-strength steel, peritectoid and hypo-peritectic steel, micro-alloyed high strength steel etc., the surface longitudinal crack defect of slab and sheet billet does not still obtain stability contorting.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of method that effectively can reduce weathering steel continuous casting steel billet lobe.
For solving the problems of the technologies described above, the invention provides a kind of method reducing weathering steel continuous casting steel billet lobe, controlling as follows in technical process:
1) low molten steel overheat and higher slab pulling rate is adopted to pour into a mould;
2) improve crystallizer entrance cooling water temperature in casting process, increase the tapering of crystallizer;
3) improve the basicity of covering slag in 1.40-1.50 scope, reduce the viscosities il of covering slag
1300 DEG Cin the scope of 0.70-0.80 pool.
Further, described molten steel overheat controls as 10-20 DEG C, and slab casting speed control is 1.4-1.5m/min.
Further, described crystallizer entrance cooling water temperature controls as 32-36 DEG C.
Further, the tapering of described increase crystallizer is that crystallizer leptoprosopy is increased 0.5mm.
Further, to be carbon content be described weathering steel 0.09%, the weathering steel of phosphorus content 0.08%.
A kind of method reducing weathering steel continuous casting steel billet lobe provided by the invention, owing to adopting the casting of molten steel low overheat and the casting of higher pulling rate, the formation speed of nascent solidified shell can be made more stable, the too fast base shell that causes of Local cooling can not be caused with covering slag to be separated the cooling effect losing crystallizer, and because low-carbon (LC) weathering steel process of setting base shell amount of contraction is larger, increase the air gap that crystallizer leptoprosopy tapering can reduce to produce between base shell and copper coin, be conducive to the heat transfer of base shell, improve casting rate, thus be conducive to enhancing productivity; Mold flux property is optimized, improves the basicity of covering slag in 1.40-1.50 scope, reduce the viscosities il of covering slag
1300 DEG Cin the scope of 0.70-0.80 pool, at utmost strengthen covering slag mobility, reduce the generation of bonding and lobe; Because the low cooling to base shell of crystallizer cooling water inlet temperature is comparatively strong, very easily produce lobe, therefore improve the cooling effect that crystallizer cooling water inlet temperature effectively can reduce crystallizer, reduce the incidence of lobe.
Detailed description of the invention
A kind of method reducing weathering steel continuous casting steel billet lobe that the embodiment of the present invention provides, is applicable to that carbon content is 0.09%, the weathering steel of phosphorus content 0.08%, controls as follows in technical process:
1) low molten steel overheat and higher slab pulling rate is adopted to pour into a mould;
2) improve crystallizer entrance cooling water temperature in casting process, increase the tapering of crystallizer;
3) improve the basicity of covering slag in 1.40-1.50 scope, reduce the viscosities il of covering slag
1300 DEG Cin the scope of 0.70-0.80 pool, at utmost strengthen covering slag mobility, reduce the generation of bonding and lobe.
Wherein, molten steel overheat controls as 10-20 DEG C, and slab casting speed control is 1.4-1.5m/min.
Wherein, crystallizer entrance cooling water temperature controls as 32-36 DEG C.
Wherein, the tapering increasing crystallizer is that crystallizer leptoprosopy is increased 0.5mm.
Be specifically described the present invention by the following examples, example, only for explaining the present invention, is not intended to limit scope of the present invention.
Embodiment 1
300 tons of steel ladle, direct casting 11 stoves, the casting degree of superheat of Metal in Tundish, slab pulling rate, crystallizer entrance cooling water temperature are in table 1.
Table 1 is cast molten steel overheat, slab pulling rate, crystallizer entrance cooling water temperature
Meanwhile, by the tapering of crystallizer on the original basis leptoprosopy increase 0.5mm, and the basicity of covering slag to be controlled be 1.40, viscosities il
1300 DEG Ccontrol is 0.70 pool.After continuous casting terminates, the lobe incidence of the weathering steel continuous casting steel billet obtained is 0.57%.
Embodiment 2
300 tons of steel ladle, direct casting 10 stoves, the casting tundish degree of superheat, slab pulling rate, crystallizer entrance cooling water temperature are in table 2.
Table 2 is cast molten steel overheat, slab pulling rate, crystallizer entrance cooling water temperature
Meanwhile, by the tapering of crystallizer on the original basis leptoprosopy increase 0.5mm, and the basicity of covering slag to be controlled be 1.50, viscosities il
1300 DEG Ccontrol is 0.80 pool.After continuous casting terminates, the lobe incidence of the weathering steel continuous casting steel billet obtained is 0.63%.
Embodiment 3
300 tons of steel ladle, direct casting 12 stoves, the casting tundish degree of superheat, slab pulling rate, crystallizer entrance cooling water temperature are in table 3.
Table 3 is cast molten steel overheat, slab pulling rate, crystallizer entrance cooling water temperature
Meanwhile, by the tapering of crystallizer on the original basis leptoprosopy increase 0.5mm, and the basicity of covering slag to be controlled be 1.45, viscosities il
1300 DEG Ccontrol is 0.75 pool.After continuous casting terminates, the lobe incidence of the weathering steel continuous casting steel billet obtained is 0.52%.
A kind of method reducing weathering steel continuous casting steel billet lobe provided by the invention, the production efficiency of crack-sensitivity steel grade is improve by improving casting rate, improve crystallizer cooling effect, decrease crystallizer strike-alarm number of times, reduce the lobe incidence of continuous casting billet, be specially:
(1) production efficiency improves, the weathering steel of 1.1m section produce by 342 tons of present steel of original 293 tons of steel/hour to bring up to/hour;
(2) crystallizer viscosity alarm times is reduced to 0.1 time/stove after process modification by original 0.5 time/stove;
(3) take the lobe rate of the technique weathering steel continuous casting steel billet after optimizing to be reduced to 0.82% by 2.75%, slab cleaning up cost reduces, sentence the minimizing of useless base quantity.
It should be noted last that, above detailed description of the invention is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to example to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (5)
1. reduce a method for weathering steel continuous casting steel billet lobe, it is characterized in that, described method comprises:
Low molten steel overheat and higher slab pulling rate is adopted to pour into a mould;
Improve crystallizer entrance cooling water temperature in casting process, increase the tapering of crystallizer;
Improve the basicity of covering slag in 1.40-1.50 scope, reduce the viscosities il of covering slag
1300 DEG Cin the scope of 0.70-0.80 pool.
2. the method for minimizing weathering steel continuous casting steel billet lobe according to claim 1, is characterized in that: described molten steel overheat controls as 10-20 DEG C, and slab casting speed control is 1.4-1.5m/min.
3. the method for minimizing weathering steel continuous casting steel billet lobe according to claim 1, is characterized in that: described crystallizer entrance cooling water temperature controls as 32-36 DEG C.
4. the method for minimizing weathering steel continuous casting steel billet lobe according to claim 1, is characterized in that: the tapering of described increase crystallizer is that crystallizer leptoprosopy is increased 0.5mm.
5. the method for the minimizing weathering steel continuous casting steel billet lobe according to any one of claim 1-4, is characterized in that: to be carbon content be described weathering steel 0.09%, the weathering steel of phosphorus content 0.08%.
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| CN201410708324.0A CN104399929A (en) | 2014-11-28 | 2014-11-28 | Method for reducing longitudinal division of weather-proof steel continuously cast slab |
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| CN201410708324.0A CN104399929A (en) | 2014-11-28 | 2014-11-28 | Method for reducing longitudinal division of weather-proof steel continuously cast slab |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106903280A (en) * | 2015-12-23 | 2017-06-30 | 本钢板材股份有限公司 | A kind of weathering steel production method of sheet blank continuous casting |
| CN107186186A (en) * | 2017-04-27 | 2017-09-22 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of method that CSP conticasters pour into a mould weather resisting steel |
| CN107357953A (en) * | 2017-06-02 | 2017-11-17 | 首钢总公司 | A kind of method that nozzle blocking is analyzed according to heat flow density |
| CN110523943A (en) * | 2019-09-02 | 2019-12-03 | 安阳钢铁股份有限公司 | A kind of control method of steel for resisting sulfuric acid dew point corrosion surface defect of bloom |
| CN113210577A (en) * | 2021-05-14 | 2021-08-06 | 宝武集团鄂城钢铁有限公司 | Method for improving success rate of changing middle ladle of wide section of plate blank and manufacturing method thereof |
| CN113399637A (en) * | 2021-06-24 | 2021-09-17 | 重庆钢铁股份有限公司 | Process for preventing crack bleed-out in Q195 steel square billet continuous casting pouring process |
| CN113560514A (en) * | 2021-06-29 | 2021-10-29 | 江苏沙钢集团有限公司 | Method for controlling surface cracks of bridge steel slab |
| CN114210940A (en) * | 2021-12-24 | 2022-03-22 | 西峡龙成冶金材料有限公司 | Continuous casting crystallizer casting powder for YQ450NQR1 high-strength high-weather-resistance B-shaped steel and application thereof |
| CN115138815A (en) * | 2022-05-20 | 2022-10-04 | 天铁热轧板有限公司 | Method for controlling longitudinal crack of continuous casting cast-on slab |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106903280A (en) * | 2015-12-23 | 2017-06-30 | 本钢板材股份有限公司 | A kind of weathering steel production method of sheet blank continuous casting |
| CN107186186A (en) * | 2017-04-27 | 2017-09-22 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of method that CSP conticasters pour into a mould weather resisting steel |
| CN107357953A (en) * | 2017-06-02 | 2017-11-17 | 首钢总公司 | A kind of method that nozzle blocking is analyzed according to heat flow density |
| CN110523943A (en) * | 2019-09-02 | 2019-12-03 | 安阳钢铁股份有限公司 | A kind of control method of steel for resisting sulfuric acid dew point corrosion surface defect of bloom |
| CN110523943B (en) * | 2019-09-02 | 2021-04-20 | 安阳钢铁股份有限公司 | Control method for surface defects of steel casting blank for resisting sulfuric acid dew point corrosion |
| CN113210577A (en) * | 2021-05-14 | 2021-08-06 | 宝武集团鄂城钢铁有限公司 | Method for improving success rate of changing middle ladle of wide section of plate blank and manufacturing method thereof |
| CN113399637A (en) * | 2021-06-24 | 2021-09-17 | 重庆钢铁股份有限公司 | Process for preventing crack bleed-out in Q195 steel square billet continuous casting pouring process |
| CN113560514A (en) * | 2021-06-29 | 2021-10-29 | 江苏沙钢集团有限公司 | Method for controlling surface cracks of bridge steel slab |
| CN114210940A (en) * | 2021-12-24 | 2022-03-22 | 西峡龙成冶金材料有限公司 | Continuous casting crystallizer casting powder for YQ450NQR1 high-strength high-weather-resistance B-shaped steel and application thereof |
| CN114210940B (en) * | 2021-12-24 | 2023-07-14 | 西峡龙成冶金材料有限公司 | Continuous casting crystallizer casting powder for YQ450NQR1 high-strength high-weather-resistance steel and application thereof |
| CN115138815A (en) * | 2022-05-20 | 2022-10-04 | 天铁热轧板有限公司 | Method for controlling longitudinal crack of continuous casting cast-on slab |
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Application publication date: 20150311 |