CN102744380B - Boron-steel-containing mold flux dedicated for continuous casting - Google Patents
Boron-steel-containing mold flux dedicated for continuous casting Download PDFInfo
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- CN102744380B CN102744380B CN201210257261.2A CN201210257261A CN102744380B CN 102744380 B CN102744380 B CN 102744380B CN 201210257261 A CN201210257261 A CN 201210257261A CN 102744380 B CN102744380 B CN 102744380B
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Abstract
The invention discloses boron-steel-containing mold flux dedicated for continuous casting, comprising the following chemical ingredients by mass: 34-40% of CaO, 23-27% of SiO2, 2-4% of Al2O3, 6-8% of F, 1-2% of MgO, 2-4% of MnO, 7-9% of Na2O, 5-8% of C and 0.1-1.5% of Li2O. Experiments on site prove that boron-steel-containing 15MnVB and S400B are cast in a slab casting machine with specification of 200*900-1200mm <2> in a steel mill under the condition that the stable casting speed is 1.60m/min, the flux consumption is 0.38Kg/steel T; and no caking occurs in the process of melting the mold flux, no flux strip exists at molten steel meniscus, the thickness of a melt cinder layer on a molten steel surface is 10-15mm, the stable and even heat flux around a crystallizer is observed by a heat flow curve to be stable and uniform, and the frictional force of the crystallizer is stable. Therefore, the experiments show that heat transmission and lubrication performances of the mold flux are good.
Description
Technical field
The invention belongs to metallurgic auxiliary materials technical field, particularly a kind of boron-containing steel continuous casting special crystallizer covering slag.
Background technology
Boracic (B) steel is a kind of low-alloy structural steel replacing Cr, Ni based on B, Mn, in some steel for machine building, add trace B (0.0010 ~ 0.050 wt%) quenching degree and fatigue resistance can be significantly improved, excellent combination property, China Cr, Ni resource scarcity, and boron aboundresources, exploitation boron-containing steel can save a large amount of noble element, can also obtain excellent mechanical performance simultaneously.Boron is one of as lively as a cricket element, and can be combined into field trash with residual nitrogen, oxygen in molten steel and lose its useful effect, the boron only existed in steel with solution just can play useful effect.When nitrogen content in steel is higher, boron and nitrogen easily combine and generate BN, and at grain boundary precipitate.The BN grain boundary precipitate of boron-containing steel is very tiny, is pinned at austenite and matrix distortion place continuously, reduces the mobility of crystal boundary, recrystallization temperature is improved.Due to recrystallization hindered, crystal boundary can not move, and stress is concentrated at grain boundaries and can not eliminate, thus causes the embrittlement of crystal boundary, reduces the thermoplasticity of steel, the crack sensitivity of steel is increased.Therefore; improve the validity of boron in steel to need to be fixed the nitrogen in steel; the element of fixed nitrogen selects aluminium (Al) to coordinate trace amount of titanium (Ti) and niobium (Nb) usually; so just cause dissolved aluminum in this type of molten steel higher; titanyl compound or nitrogen oxide have been introduced again simultaneously; in continuous casting steel machine process, nozzle clogging is easily made to cause molten steel bias current in crystallizer, the sex change of crystallizer protecting residue melt cinder.The major defect of boron-containing steel on strand shows as edge cracks, and this has had a strong impact on the quality of strand.
Summary of the invention
For boron-containing steel strand edge cracks FAQs, the invention provides a kind of boron-containing steel continuous casting special crystallizer covering slag that can efficiently solve casting billet surface edge cracks problem.
A kind of boron-containing steel continuous casting special crystallizer covering slag, its chemical composition mass percentage is as follows: CaO 34 ~ 40%, SiO2
23 ~ 27%, Al2O3 2 ~ 4%, F
-6 ~ 8%, MgO 1 ~ 2%, MnO 2 ~ 4%, Na2O 7 ~ 9%, C 5 ~ 8%, Li2O 0.1 ~ 1.5%.
The raw material of described boron-containing steel continuous casting special crystallizer covering slag comprises following composition: the fluorite of 9 ~ 12% quality, the wollastonite of 19 ~ 23% quality, the pre-melt of 29 ~ 33% quality, the flint clay of 7 ~ 10% quality, the sodium carbonate of 7 ~ 10% quality, the clinker of 6 ~ 9% quality, the calcite of 6 ~ 9% quality, the magnesium carbonate of 0.5 ~ 2.5% quality, the manganese carbonate of 2 ~ 5% quality, the spodumene of 0.5 ~ 6.5% quality, the middle carbon of 0.2 ~ 4% quality, the carbon black of 0.1 ~ 3% quality, the sodium cellulosate of 0.8 ~ 2.5% quality, its surplus is water, composition and the mass percentage of described pre-melt are: SiO2 28 ~ 32%, CaO 45 ~ 49%, Na2O 8 ~ 10%, F
-6.5 ~ 8.5%.
Join selecting of slag base-material.Mold flux property depends on the selection of slag base-material processed, and conventional machine mixes slag and mainly adopts multiple raw material to be mixed, and has influence on performance change, have impact on the stability of slag owing to producing decomposition of chemical compounds after being heated.The present invention selects pre-melted type slag to join slag base-material as covering slag, and the stability of Slag Properties is greatly enhanced.
The brilliant covering slag of boron-containing steel special continuous casting knot device of the present invention mainly considers following factor:
Covering slag basicity
Covering slag basicity is the index of reflection melt structure; to a certain extent the melt structure of covering slag is had a great impact; to the crystallization property of covering slag and covering slag to solidify behavioral implications very large; being directly connected to heat conductivility and the greasy property of covering slag, is the important indicator weighing covering slag characteristic.Covering slag basicity directly affects the percent crystallization in massecuite of slag film, and high basicity slag can form the slag film of high percent crystallization in massecuite, and the covering slag of high percent crystallization in massecuite effectively can reduce initial solidification shell through slag film to Billet speed, and make casting blank shell grow evenly, Crack prevention produces.
Containing oxide and nitride such as acid Al, BN, Ti or Nb in boron-containing steel, improve the basicity of slag, diffusion velocity is accelerated, be conducive to accelerating to absorb being mingled with in molten steel.So improving basicity is improve the effective means of slag absorb inclusion and control surface edge lobe.This covering slag basicity is selected to control 1.25 ~ 1.35.
The viscosity of covering slag
The viscosity of covering slag determines the mobility of melt cinder in crystallizer inside and spreading property.Mentality of designing of the present invention is, liquid slag layer above molten steel is direct and steel contacts temperature is higher, and temperature is lower when arriving around base shell, the covering slag of the present invention's design has shorter temperature ~ viscosity profile, such advantage is: the melt cinder above molten steel has good fluidity because viscosity is very low, still can play good isolated air effect when liquid level fluctuation of molten steel is larger; After absorb inclusion, diffusion velocity is fast, improves melt cinder to the absorptivity be mingled with in molten steel; When the acidic oxide melt cinder absorbed in molten steel arrives base shell surrounding, because melt cinder temperature first mate degree reduces, the surface tension of melt cinder and raising rapidly, this makes melt cinder have good spreadability at crystallizer inwall, can reduce frictional force between base shell and crystallizer by first mate's degree simultaneously.
Prove through field trial, at certain steel mill 200 × 900 ~ 1200mm
2on slab caster, slag consumption when boron-containing steel 15MnVB, S400B pulling rate of having cast respectively is stabilized in 1.60m/min is 0.38Kg/T steel; Without conglomeration in covering slag fusion process, molten steel meniscus place is without slag bar, and molten steel surface liquid slag layer thickness 10 ~ 15mm, is stablized by heat flow curve observation crystallizer four sides heat flux and evenly, crystallizer friction is stablized; Illustrate covering slag heat transfer and greasy property good.Casting billet surface is without slag inclusion, dry slag and edge cracks phenomenon, and cc billet surface quality is intact, describes the continuous casting direct motion that this covering slag can meet slab boron-containing steel.More specifically; the present invention under the process conditions of boron-containing steel in conjunction with casting condition; covering slag effectively adsorbs oxide and nitride such as being mingled with in molten steel acid Al, BN, Ti or Nb, fundamentally solves and concentrates because being mingled with the molten steel grain boundaries in cooling procedure caused the strand edge cracks problem caused.In casting process, provide enough thick and the liquid slag layer of good fluidity, effectively prevent secondary oxidation of steel when liquid level fluctuation of molten steel, avoid the secondary oxidation increases such as Ti or Nb to be newly mingled with.
Detailed description of the invention
Embodiment 1:
A kind of boron-containing steel continuous casting special crystallizer covering slag, its chemical composition mass percentage is as follows: CaO 37.12 %, SiO2 26.14%, Al2O3 2.64%, Na2O 7.22 %, MgO 1.09%, F
-7.29%, MnO 2.86%, C, 7.10%, Li2O 0.94%.Covering slag physical property, fusing point 1105 DEG C, the viscosity 0.13PaS of 1300 DEG C, burn-off rate 21 seconds.
Embodiment 2:
A kind of boron-containing steel continuous casting special crystallizer covering slag, its chemical composition mass percentage is as follows: CaO 36.70%, SiO224.45%, Al2O3 3.51%, Na2O 7.46%, MgO 1.52%, F
-6.29%, MnO 2.36%, C, 6.60%, Li20 1.17%.Covering slag physical property: fusing point 1115 DEG C, the viscosity 0.14PaS of 1300 DEG C, burn-off rate 20 seconds.
Embodiment 3:
A kind of boron-containing steel continuous casting special crystallizer covering slag, its chemical composition mass percentage is as follows: CaO 39.4 %, SiO2 25.25%, Al2O3 3.48%, Na2O 8.56 %, MgO 1.68%, F
-6.36%, MnO 3.24%, C 7.52% Li2O 0.58%.Covering slag physical property, fusing point 1105 DEG C, the viscosity 0.13PaS of 1300 DEG C, burn-off rate 21 seconds.
Claims (1)
1. a boron-containing steel continuous casting special crystallizer covering slag, is characterized in that: its chemical composition mass percentage is as follows: CaO 34 ~ 40%, SiO2
23 ~ 27%, Al2O3 2 ~ 4%, F
-6 ~ 8%, MgO 1 ~ 2%, MnO 2 ~ 4%, Na2O 7 ~ 9%, C 5 ~ 8%, Li2O 0.1 ~ 1.5%, the raw material of described boron-containing steel continuous casting special crystallizer covering slag comprises following composition: the fluorite of 9 ~ 12% quality, the wollastonite of 19 ~ 23% quality, the pre-melt of 29 ~ 33% quality, the flint clay of 7 ~ 10% quality, the sodium carbonate of 7 ~ 10% quality, the clinker of 6 ~ 9% quality, the calcite of 6 ~ 9% quality, the magnesium carbonate of 0.5 ~ 2.5% quality, the manganese carbonate of 2 ~ 5% quality, the spodumene of 0.5 ~ 6.5% quality, the middle carbon of 0.2 ~ 4% quality, the carbon black of 0.1 ~ 3% quality, the sodium cellulosate of 0.8 ~ 2.5% quality, its surplus is water, composition and the mass percentage of described pre-melt are: SiO2 28 ~ 32%, CaO 45 ~ 49%, Na2O 8 ~ 10%, F
-6.5 ~ 8.5%.
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| CN102744380B true CN102744380B (en) | 2015-06-24 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104624997B (en) * | 2015-03-04 | 2016-08-24 | 西峡龙成冶金材料有限公司 | A kind of boron-containing steel continuous crystallizer protecting slag |
| CN105200189A (en) * | 2015-10-09 | 2015-12-30 | 天津钢铁集团有限公司 | Method for controlling corner cracks of boron micro-alloy steel continuous-casting billet |
| CN105935750A (en) * | 2016-06-21 | 2016-09-14 | 唐山钢铁集团有限责任公司 | Continuous casting protective slag for high-boron steel |
| CN108176830A (en) * | 2017-12-28 | 2018-06-19 | 西峡龙成冶金材料有限公司 | A kind of boron-containing steel chamfering copper coin continuous crystallizer protecting slag |
| CN108213366A (en) * | 2018-02-27 | 2018-06-29 | 首钢京唐钢铁联合有限责任公司 | A kind of covering slag in continuous casting and application thereof |
| CN110315040B (en) * | 2019-08-20 | 2021-07-09 | 西峡县恒基冶材有限公司 | Continuous casting crystallizer casting powder for high-carbon high-titanium wear-resistant steel |
| CN112935214A (en) * | 2021-02-09 | 2021-06-11 | 鞍钢股份有限公司 | Method for distinguishing flow field bias flow in crystallizer |
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Patent Citations (5)
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| US6461402B1 (en) * | 1998-12-08 | 2002-10-08 | Shinagawa Refractories Co., Ltd. | Molding powder for continuous casting of steel and method for continuous casting of steel |
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Inventor after: Zhu Shijia Inventor after: Wang Qingde Inventor after: Wu Jinbo Inventor after: Zhang Guoling Inventor after: Li Xiufeng Inventor after: Luo Zhigang Inventor after: Li Dangjun Inventor after: Tang Hongbo Inventor before: Wang Qinglai Inventor before: Wang Qingde Inventor before: Wu Jinbo Inventor before: Zhang Guoling Inventor before: Li Xiufeng Inventor before: Luo Zhigang Inventor before: Li Dangjun Inventor before: Zhu Yunfeng Inventor before: Tang Hongbo |
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Free format text: CORRECT: INVENTOR; FROM: WANG QINGLAI WANG QINGDE WU JINBO ZHANG GUOLING LI XIUFENG LUO ZHIGANG LI DANGJUN ZHU YUNFENG TANG HONGBO TO: ZHU SHIJIA WANG QINGDE WU JINBO ZHANG GUOLING LI XIUFENG LUO ZHIGANG LI DANGJUN TANG HONGBO |
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