CN102744380A - 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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- CN102744380A CN102744380A CN2012102572612A CN201210257261A CN102744380A CN 102744380 A CN102744380 A CN 102744380A CN 2012102572612 A CN2012102572612 A CN 2012102572612A CN 201210257261 A CN201210257261 A CN 201210257261A CN 102744380 A CN102744380 A CN 102744380A
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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 the metallurgic auxiliary materials technical field, particularly a kind of boron-containing steel continuous casting special crystallizer covering slag.
Background technology
Boracic (B) steel is to be a kind of low-alloy structural steel of basic replaced C r, Ni with B, Mn; In some steel for machine building, add trace B (0.0010～0.050 wt%) and can significantly improve quenching degree and fatigue resistance; Excellent combination property, China Cr, Ni resource scarcity, and boron aboundresources; The exploitation boron-containing steel can be practiced thrift a large amount of noble elements, can also obtain good mechanical performance simultaneously.Boron is one of as lively as a cricket element, can be combined into field trash and lose its useful effect with residual nitrogen, oxygen in the molten steel, only exists the boron in the steel just can play useful effect with the solid solution form.When the nitrogen content in the steel was higher, boron and nitrogen combined to generate BN easily, 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, has reduced the flowability of crystal boundary, and recrystallization temperature is improved.Because crystallization is obstructed again, crystal boundary can not move, and stress is concentrated at the crystal boundary place and can not be eliminated, thereby causes the embrittlement of crystal boundary, reduces the thermoplasticity of steel, and the crack sensitivity of steel is increased.Therefore; Improving the validity of boron in steel need fix the nitrogen in the steel, and the element of fixed nitrogen selects aluminium (Al) to cooperate trace amount of titanium (Ti) and niobium (Nb) usually, and it is higher so just to have caused in this type of molten steel acid to dissolve aluminium; Titanyl compound or nitrogen oxide have been introduced simultaneously again; In the continuous casting steel machine process, be prone to make nozzle clogging to cause the molten steel bias current in the crystallizer, the sex change of crystallizer protecting residue melt cinder.The major defect of boron-containing steel on strand shows as limit portion crackle, and this has had a strong impact on the quality of strand.
Summary of the invention
To boron-containing steel strand limit portion crackle FAQs, the present invention provides a kind of boron-containing steel continuous casting special crystallizer covering slag that can efficiently solve casting billet surface limit portion crack problem.
A kind of boron-containing steel continuous casting special crystallizer covering slag, its chemical composition quality percentage composition is following: CaO 34～40%, SiO2
23～27%, Al2O3 2～4%, F
-6～8%, MgO 1～2%, and MnO 2～4%, and Na2O 7～9%, and C 5～8%, and Li2O 0.1～1.5%.
The raw material of said 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 fritting material 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; 0.8 the sodium cellulosate of～2.5% quality, its surplus are water, the composition of said fritting material and quality percentage composition are: SiO2 28～32%; CaO 45～49%, and Na2O 8～10%, F
-6.5～8.5%.
Join selecting for use of slag base-material.The performance of covering slag depends on the selection of system slag base-material, and conventional machine mixes slag and mainly adopts multiple raw material to be mixed and made into, and has influence on performance variation owing to the back that is heated produces decomposition of chemical compounds, has influenced the stability of slag.The present invention selects for use the pre-melted type slag to join the 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 is mainly considered following factor:
Covering slag basicity
Covering slag basicity is the index of reflection melt structure; Melt structure to covering slag has very big influence to a certain extent; To the crystallization property of covering slag and covering slag to solidify behavioral implications very big; Being directly connected to the heat conductivility and the greasy property of covering slag, is the important indicator of weighing the covering slag characteristic.Covering slag basicity directly influences the percent crystallization in massecuite of slag film, and high basicity slag can form the slag film of high percent crystallization in massecuite, the covering slag of high percent crystallization in massecuite can effectively reduce initial solidification shell through the slag film to the crystallizer heat transfer rate, make casting blank shell growth evenly, avoid crackle to produce.
Contain oxide and nitride such as acid Al, BN, Ti or Nb in the boron-containing steel, improve the basicity of slag, diffusion velocity is accelerated, help accelerating to absorb being mingled with in the molten steel.So improve basicity is to improve slag to absorb the effective means that is mingled with control surface limit portion lobe.This covering slag basicity is selected to be controlled at 1.25～1.35.
The viscosity of covering slag
The viscosity of covering slag has determined melt cinder at crystallizer inner flowability and spreading property.Mentality of designing of the present invention is; Directly to contact temperature higher with molten steel for the liquid slag layer of molten steel top; And temperature is lower around arriving the base shell time; The covering slag of the present invention's design has short temperature～viscosity profile, and such advantage is: the melt cinder above molten steel has good fluidity because of viscosity is very low, under the bigger situation of liquid level fluctuation of molten steel, still can play good secluding air effect; It is fast that absorption is mingled with the back diffusion velocity, improves the absorptivity of melt cinder to being mingled with in the molten steel; When having absorbed acidic oxide melt cinder in the molten steel and having arrived around the base shell; Because of melt cinder temperature first mate degree reduces; The surface tension of melt cinder and raising rapidly, this makes melt cinder at the crystallizer inwall good spreadability arranged, and can reduce the frictional force between base shell and crystallizer by first mate's degree simultaneously.
Prove through field trial, at certain 200 * 900～1200mm of steel mill
2On the slab caster, the boron-containing steel 15MnVB that cast respectively, the consumption of the slag when the S400B pulling rate is stabilized in 1.60m/min are the 0.38Kg/T steel; Do not have conglomeration in the covering slag fusion process, molten steel meniscus place does not have the slag bar, molten steel surface liquid slag layer thickness 10～15mm, and heat flux is stable and even on four sides to observe crystallizer through heat flow curve, and the crystallizer friction is stable; Explain that covering slag conducts heat and greasy property is good.Casting billet surface does not have slag inclusion, dry slag and limit portion seminess, and cc billet surface quality is intact, has explained that this covering slag can satisfy the continuous casting direct motion of slab boron-containing steel.More special is; The present invention combines the casting condition under the process conditions of boron-containing steel; Covering slag effectively absorption is mingled with oxide and nitride such as acid Al, BN, Ti or Nb in the molten steel, fundamentally solves because of being mingled with the molten steel crystal boundary place in cooling procedure that causes and concentrates the strand limit portion crack problem that causes.The liquid slag layer of enough thick and good fluidity is provided in the casting process, under the situation of liquid level fluctuation of molten steel, effectively prevents secondary oxidation of steel, avoid secondary oxidation increases such as Ti or Nb newly to be mingled with.
The specific embodiment
Embodiment 1:
A kind of boron-containing steel continuous casting special crystallizer covering slag, its chemical composition quality percentage composition is following: CaO 37.12 %, SiO2 26.14%, and Al2O3 2.64%, Na2O 7.22 %, MgO 1.09%, F
-7.29%, MnO 2.86%, and C 7.10%, and Li2O 0.94%.The covering slag physical property, 1105 ℃ of fusing points, 1300 ℃ viscosity 0.13PaS, burn-off rate 21 seconds.
Embodiment 2:
A kind of boron-containing steel continuous casting special crystallizer covering slag, its chemical composition quality percentage composition is following: CaO 36.70%, SiO224.45%, Al2O3 3.51%, and Na2O 7.46%, and MgO 1.52%, F
-6.29%, MnO 2.36%, and C 6.60%, and Li20 1.17%.Covering slag physical property: 1115 ℃ of fusing points, 1300 ℃ viscosity 0.14PaS, burn-off rate 20 seconds.
Embodiment 3:
A kind of boron-containing steel continuous casting special crystallizer covering slag, its chemical composition quality percentage composition is following: CaO 39.4 %, SiO2 25.25%, and Al2O3 3.48%, Na2O 8.56 %, MgO 1.68%, F
-6.36%, MnO 3.24%, C 7.52% Li2O 0.58%.The covering slag physical property, 1105 ℃ of fusing points, 1300 ℃ viscosity 0.13PaS, burn-off rate 21 seconds.
Claims (2)
1. boron-containing steel continuous casting special crystallizer covering slag, it is characterized in that: its chemical composition quality percentage composition is following: CaO 34～40%, SiO2
23～27%, Al2O3 2～4%, F
-6～8%, MgO 1～2%, and MnO 2～4%, and Na2O 7～9%, and C 5～8%, and Li2O 0.1～1.5%.
2. boron-containing steel continuous casting special crystallizer covering slag as claimed in claim 1 is characterized in that: the raw material of said 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 fritting material 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; 0.5 the spodumene of～6.5% quality, the middle carbon of 0.2～4% quality, the carbon black of 0.1～3% quality; 0.8 the sodium cellulosate of～2.5% quality, its surplus are water, the composition of said fritting material and quality percentage composition are: SiO2 28～32%; CaO 45～49%, and Na2O 8～10%, F
-6.5～8.5%.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104624997A (en) * | 2015-03-04 | 2015-05-20 | 西峡龙成冶金材料有限公司 | Continuous casting mold flux for boron containing steel |
| 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 | Covering slag in continuous casting production and application thereof |
| CN110315040A (en) * | 2019-08-20 | 2019-10-11 | 西峡县恒基冶材有限公司 | A kind of high titanium abrasion-resistant stee continuous crystallizer protecting slag of high-carbon |
| 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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| CN103008590A (en) * | 2012-12-08 | 2013-04-03 | 内蒙古包钢钢联股份有限公司 | Continuous casting mold covering slag for medium carbon steel containing manganese |
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| CN104624997A (en) * | 2015-03-04 | 2015-05-20 | 西峡龙成冶金材料有限公司 | Continuous casting mold flux for boron containing steel |
| 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 | Covering slag in continuous casting production and application thereof |
| CN110315040A (en) * | 2019-08-20 | 2019-10-11 | 西峡县恒基冶材有限公司 | A kind of high titanium abrasion-resistant stee continuous crystallizer protecting slag of high-carbon |
| 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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| CN102744380B (en) | 2015-06-24 |
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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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