CN101985721B - Method for preparing oriented silicon steel thin strip using aluminum nitride as inhibitor - Google Patents
Method for preparing oriented silicon steel thin strip using aluminum nitride as inhibitor Download PDFInfo
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- CN101985721B CN101985721B CN2010105658175A CN201010565817A CN101985721B CN 101985721 B CN101985721 B CN 101985721B CN 2010105658175 A CN2010105658175 A CN 2010105658175A CN 201010565817 A CN201010565817 A CN 201010565817A CN 101985721 B CN101985721 B CN 101985721B
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Abstract
The invention relates to the field of metallurgy science, in particular to a method for preparing an oriented silicon steel thin strip. The method comprises the following steps of: firstly smelting raw materials in an intermediate frequency vacuum induction furnace to form liquid steel; then carrying out continuous casting on the liquid steel formed by smelting by using a double-roller continuous casting machine to form a thin strip; and finally carrying out continuous cooling and continuous normalizing treatment on the thin strip so as to form a large number of aluminum nitride inhibitors which are distributed in the oriented silicon steel thin strip in a dispersion mode and have a size range of 30 to 100nm. The manufacturing process is simple, the high-temperature reheating solutionizing process is saved, the advantages and potential of double-roller thin strip continuous casting technology on the regulation and control of the oriented silicon steel inhibitor can be sufficiently exerted, the material point of the aluminum nitride inhibitor with satisfied forms and distribution characteristics can be obtained and necessary conditions are provided for secondary recrystallization in the subsequent high-temperature annealing process.
Description
Technical field
The present invention relates to metallurgical technology field, being specifically related to a kind of is the preparation method of the orientation silicon steel thin made-up belt of suppressor factor with the aluminium nitride AlN.
Background technology
Oriented silicon steel (comprising common orientation silicon steel and high magnetic induction grain-oriented silicon steel) is a kind of siliceous soft magnetic materials of about 3% and since have strong 110} (001) goss texture, thus along rolling, be mainly used in transformer core to having low iron loss and high magnetic flux density.It is the product that unique utilization phenomenon of secondary recrystallization is produced in the Iron And Steel Industry, is the comparatively successful application in suitability for industrialized production of texture control techniques.The Production Flow Chart of existing oriented silicon steel is: smeltings → continuous casting → heating → hot rolling → normalizing processing → pickling → cold rolling → process annealing → secondary cold-rolling → decarburizing annealing → be coated with MgO sealing coat → high temperature annealing → stretching and leveling anneal → be coated with insulation layer → laser treatment → shearing, pack.The target of the manufacturing process design and processes parameter regulation and control of oriented silicon steel is in high-temperature annealing process, to form strong goss texture through the secondary recrystallization process, and its core is the suppressor factor control techniques.In order to obtain to have tiny, the inhibitor particle that disperse distributes of suitable quantity and size, need when steel-making, add the suppressor factor forming element usually.In order to guarantee to obtain stable high magnetic, must be before hot rolling strand be carried out 1350 ~ 1400 ℃ heating solution treatment, so that the sulfide of chap and nitride solid solution again in the annealing process behind the continuous casting.At hot rolling or tropical annealing stage, hope that again sulfide and nitride separate out with disperse state, these precipitates must be maintained to cold rolling back secondary recrystallization to begin.Even in the cover annealing process, also must avoid suppressor factor to cause restraining effect to reduce because of solid solution too early or alligatoring.But the heat slab about 1400 ℃ can produce many problems: many like iron scale, scaling loss is big, lumber recovery is low; Repair stove frequency height, output reduction; Fuel consumption is many, furnace campaign is short, manufacturing cost is high, surface defects of products increases etc.Another kind method is after decarburizing annealing, to carry out nitriding to handle.But there is certain difficulty in nitriding process aspect the homogeneity of control suppressor factor.In addition, also there are problems such as facility investment is big, complex procedures, energy consumption is big, carrying capacity of environment is big in existing Production Flow Chart.
To be a kind of crystallization roller that utilizes two rotations become liquid metal direct pouring strip, can save the nearly end form forming technique of short flow process of heating and hot-rolled process twin-roll thin strip continuous casting, has advantages such as energy-saving and environmental protection, low cost.In addition, twin-roll thin strip continuous casting has the characteristics with the molten steel rapid solidification, and it is up to 10
2~ 10
4℃/speed of cooling of s is far longer than the speed of cooling of conventional continuous casting heavy slab.By its rate of cooling faster; The orientation silicon steel thin made-up belt can obtain than conventional continuously cast bloom homogeneous, tiny initial solidification tissue more; And make the suppressor factor forming element be in solid solution condition, help tissue, the control of suppressor factor and the improvement of production board magnetic property in the subsequent processes.
Through the existing patent documentation of retrieval discovery twin-roll thin strip continuous casting oriented silicon steel, like EP 0390160B1, US 2003/0155040A1, WO 02/50315 A2 all discloses the method for utilizing twin-roll thin strip continuous casting to make oriented silicon steel.But; These methods are only cooled off or continuously hot rolling high temperature strip base continuously; Do not have to cool off continuously with continuous normalizing processing and combine; So before cold rolling, need the strip base is carried out the reheat anneal, increased treatment process, farthest do not given play to advantage and the potentiality of twin-roll thin strip continuous casting technology in the regulation and control of oriented silicon steel suppressor factor yet.
Summary of the invention
The objective of the invention is the deficiency to the prior art existence, providing a kind of is the preparation method of the orientation silicon steel thin made-up belt of suppressor factor with the aluminium nitride AlN, prepares the orientation silicon steel thin made-up belt that contains the aluminium nitride AlN suppressor factor tiny in a large number, that disperse distributes.
The technical scheme that realizes the object of the invention comprises smelting, continuous casting; Cooling and continuous normalizing step is characterized in that continuously, derive behind the double-roller continuous casting machine continuous casting smelting the molten steel that forms; Forming thickness is 2 ~ 5mm orientation silicon steel thin made-up belt; It is cooled off continuously, and rate of cooling is 100 ~ 300 ℃/s, and final cooling temperature is 950 ~ 1050 ℃; Then with continuous cooled strip base 900 ~ 950 ℃ the insulation 2 ~ 5 minutes after; Rate of cooling with 20 ~ 40 ℃/s is cooled to below 100 ℃ again; Obtain orientation silicon steel thin made-up belt finished product, the size range of the aluminium nitride AlN suppressor factor that the disperse that in the strip base, forms distributes is 30 ~ 100nm;
The chemical ingredients of said raw material is by weight percentage: Si 2.8 ~ 3.4%, and C 0.04 ~ 0.07%, and N 0.003 ~ 0.008%, and Als 0.02 ~ 0.04%, and surplus is Fe and unavoidable impurities element;
The temperature of described strip base when double-roller continuous casting machine is derived is 1300 ~ 1400 ℃.
Compared with prior art, characteristics of the present invention and beneficial effect thereof are:
ME of the present invention is simple; Both saved the high temperature reheat solid solution operation of orientation silicon steel thin made-up belt; Can give full play of advantage and the potentiality of twin-roll thin strip continuous casting technology in the regulation and control of oriented silicon steel suppressor factor again; Can obtain to have the aluminium nitride AlN suppressor factor particle of satisfied form and distribution characteristics, be the prerequisite that provides of secondary recrystallization in the follow-up high-temperature annealing process.
Description of drawings
Fig. 1 is of the present invention to be the orientation silicon steel thin made-up belt preparing method's of suppressor factor process flow diagram with the aluminium nitride AlN
The transmission electron microscope photo of aluminium nitride AlN suppressor factor in the orientation silicon steel thin made-up belt in Fig. 2 embodiments of the invention 1
The energy spectrum analysis photo of aluminium nitride AlN suppressor factor in the orientation silicon steel thin made-up belt in Fig. 3 embodiments of the invention 1.
Embodiment
Of the present invention is that preparing method's technical process of orientation silicon steel thin made-up belt of suppressor factor is as shown in Figure 1 with the aluminium nitride AlN.Its technological process is: the molten steel in the intermediate frequency vacuum induction furnace 1 is poured in the tundish 2; Molten steel in the tundish 2 flows in the cavity of being made up of the crystallization roller 3 of two rotations again and forms molten bath 4; Molten steel in the molten bath 4 contacts and forms scull with crystallization roller 3; Along with the metal heat is constantly derived by crystallization roller 3, molten steel continues to solidify, and forms strip base 5.Strip base 5 carries out continuous processing under cooling through aerosol cooling and laminar flow water cooling equipment 6 to it after going out crystallization roller 3 immediately, and then through normalizing treatment facility 7 it is carried out continuous normalizing and handle.
Below in conjunction with embodiment the present invention is elaborated, but protection scope of the present invention is not limited only to following embodiment:
Embodiment 1:
(1) smelts continuous casting: at first raw material is smelted, behind the double-roller continuous casting machine continuous casting, derived with smelting the molten steel that forms in the intermediate frequency vacuum induction furnace; Deriving temperature is 1370 ℃, and forming thickness is the orientation silicon steel thin made-up belt of 2.2mm, and the chemical ingredients of strip base is Si 3.1% by weight percentage; C 0.053%; N 0.004%, and Als 0.034%, and surplus is Fe and unavoidable impurities;
(2) cooling continuously: the strip base that continuous casting is gone out cools off continuously, and rate of cooling is 200 ℃/s, and final cooling temperature is 1000 ℃;
(3) normalizing continuously: after 2 minutes, the rate of cooling with 25 ℃/s is cooled to below 100 ℃ continuous cooled strip base again 920 ℃ of insulations; Obtain orientation silicon steel thin made-up belt finished product, the size range of the aluminium nitride AlN inhibitor particle that the disperse that forms in the strip base distributes is 30 ~ 100nm;
The characteristic that precipitate in the present embodiment as shown in Figure 2 in the orientation silicon steel thin made-up belt has is tiny, disperse distributes, its size range is 30 ~ 100nm; EDAX results as shown in Figure 3 shows that these precipitates are aluminium nitride AlN.
Embodiment 2:
(1) smelts continuous casting: at first raw material is smelted, behind the double-roller continuous casting machine continuous casting, derived with smelting the molten steel that forms in the intermediate frequency vacuum induction furnace; Deriving temperature is 1300 ℃, and forming thickness is the orientation silicon steel thin made-up belt of 3.5mm, and the chemical ingredients of strip base is Si 2.8% by weight percentage; C 0.04%; N 0.003%, and Als 0.04%, and surplus is Fe and unavoidable impurities;
(2) cooling continuously: the strip base that continuous casting is gone out cools off continuously, and rate of cooling is 100 ℃/s, and final cooling temperature is 1050 ℃;
(3) continuously normalizing: continuous cooled strip base is 950 ℃ of insulations after 2 minutes; Rate of cooling with 20 ℃/s is cooled to below 100 ℃ again; Obtain orientation silicon steel thin made-up belt finished product, the size range of the aluminium nitride AlN inhibitor particle that the disperse that forms in the strip base distributes is 30 ~ 100nm.
Embodiment 3:
(1) smelts continuous casting: at first raw material is smelted, behind the double-roller continuous casting machine continuous casting, derived with smelting the molten steel that forms in the intermediate frequency vacuum induction furnace; Deriving temperature is 1400 ℃, and forming thickness is the orientation silicon steel thin made-up belt of 5mm, and the chemical ingredients of strip base is Si 3.4% by weight percentage; C 0.07%; N 0.008%, and Als 0.02%, and surplus is Fe and unavoidable impurities;
(2) cooling continuously: the strip base that continuous casting is gone out cools off continuously, and rate of cooling is 300 ℃/s, and final cooling temperature is 950 ℃;
(3) continuously normalizing: continuous cooled strip base is 900 ℃ of insulations after 5 minutes; Rate of cooling with 40 ℃/s is cooled to below 100 ℃ again; Obtain orientation silicon steel thin made-up belt finished product, the size range of the aluminium nitride AlN inhibitor particle that the disperse that forms in the strip base distributes is 30 ~ 100nm.
Claims (2)
1. one kind is the preparation method of the orientation silicon steel thin made-up belt of suppressor factor with the aluminium nitride AlN, comprises smelting, continuous casting; Cooling and continuous normalizing step is characterized in that continuously, derive behind the double-roller continuous casting machine continuous casting smelting the molten steel that forms; Forming thickness is 2～5mm orientation silicon steel thin made-up belt, and its chemical ingredients is by weight percentage: Si 2.8～3.4%, and C 0.04～0.07%; N 0.003～0.008%, and Als 0.02～0.04%, and surplus is Fe and unavoidable impurities element; It is cooled off continuously, and rate of cooling is 100～300 ℃/s, and final cooling temperature is 950～1050 ℃; Then with continuous cooled strip base 900～950 ℃ the insulation 2～5 minutes after; Rate of cooling with 20～40 ℃/s is cooled to below 100 ℃ again; Obtain orientation silicon steel thin made-up belt finished product, the size range of the aluminium nitride AlN suppressor factor that the disperse that in the strip base, forms distributes is 30～100nm.
2. according to claim 1 a kind of be the preparation method of the orientation silicon steel thin made-up belt of suppressor factor with the aluminium nitride AlN, it is characterized in that the temperature of described strip base when double-roller continuous casting machine is derived is 1300～1400 ℃.
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| CN104313469B (en) * | 2014-09-28 | 2017-03-15 | 东北大学 | A kind of Ultra-low carbon directional silicon steel and its manufacture method |
| WO2018119550A1 (en) * | 2016-12-26 | 2018-07-05 | 宝山钢铁股份有限公司 | Thin-strip continuously-cast band steel cooling mechanism and cooling method therefor |
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| JP3133855B2 (en) * | 1993-03-17 | 2001-02-13 | 川崎製鉄株式会社 | Manufacturing method of grain-oriented electrical steel sheet with excellent magnetic properties |
| RU2290448C2 (en) * | 2001-09-13 | 2006-12-27 | Ак Стил Пропертиз, Инк. | Method of continuous casting of strip from electrical steel at controllable sprinkling cooling |
| KR20050018677A (en) * | 2002-05-08 | 2005-02-23 | 에이케이 프로퍼티즈 인코포레이티드 | Method of continuous casting non-oriented electrical steel strip |
| KR20100072376A (en) * | 2002-05-08 | 2010-06-30 | 에이케이 스틸 프로퍼티즈 인코포레이티드 | Method of continuous casting non-oriented electrical steel strip |
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Application publication date: 20110316 Assignee: Hebei dedicated Steel Co., Ltd. Assignor: Northeastern University Contract record no.: 2016210000030 Denomination of invention: Method for preparing oriented silicon steel thin strip using aluminum nitride as inhibitor Granted publication date: 20120704 License type: Exclusive License Record date: 20160923 |
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