CN-117086275-B - Method for preparing oriented silicon steel and oriented silicon steel

CN117086275BCN 117086275 BCN117086275 BCN 117086275BCN-117086275-B

Abstract

The application discloses a method for preparing oriented silicon steel and the oriented silicon steel, which comprises the steps of continuously casting molten steel through a crystallizer to obtain a casting blank, wherein unidirectional pulse current is applied to the molten steel in the crystallizer, hot rolling the casting blank to obtain a hot rolled coil, and subsequent treatment is carried out on the hot rolled coil to obtain the oriented silicon steel, and unidirectional pulse current is applied to the molten steel in the crystallizer, so that the types and the contents of metallographic structures in the casting blank can be changed, and strip-shaped structures are generated less or not when the casting blank is subjected to subsequent rolling procedures, thereby improving the magnetic performance and the internal quality of the prepared oriented silicon steel, such as linear crystal defects.

Inventors

QIU SHENGTAO
LI JIANGBO
Qiao Jialong
XIE KAI
LIANG LIANG
WANG HAIJUN
ZHU YECHAO
Shi Pengzhao
YANG XIUZHI
XIANG LI
WANG JING
TIAN FEI

Assignees

湖南华菱涟源钢铁有限公司
中达连铸技术国家工程研究中心有限责任公司
湖南涟钢电磁材料有限公司

Dates

Publication Date: 20260508
Application Date: 20230810

Claims (6)

1. A method for producing oriented silicon steel, comprising: Continuously casting molten steel through a crystallizer to obtain a casting blank, wherein the molten steel comprises, by mass, less than or equal to 0.0050% of C, 2.8% -3.8% of Si, 0.05% -0.2% of Mn, less than or equal to 0.010% of P, less than or equal to 0.0030% of S, less than or equal to 0.0040% of N, 0.5% -1.3% of Als, less than or equal to 0.0020% of Ti, nb and V respectively, and the balance Fe and other unavoidable impurity elements, applying unidirectional pulse current to molten steel in the crystallizer, wherein the current intensity of the unidirectional pulse current is 900-2000A, the frequency of the unidirectional pulse current is 1 HZ-100 HZ, the voltage of the unidirectional pulse current is-30-0V, and the depth of an electrode inserted into the molten steel of the crystallizer is 10 cm-400 cm; carrying out hot rolling on a casting blank to obtain a hot rolled coil; And carrying out subsequent treatment on the hot rolled coil to obtain the oriented silicon steel.
2. The method according to claim 1, wherein the means for applying unidirectional pulse current to molten steel in the mold comprises connecting one side connected to a power source to the molten steel in the mold through an electrode and connecting the other side connected to the power source to a straightening roll in the continuous casting through a wire.
3. The method according to claim 2, wherein the electrode comprises any one of a cermet electrode, a graphite electrode and an electrode with the same material as the water gap of the crystallizer; and/or the number of the groups of groups, The wire comprises a metal wire with the section of more than or equal to 100mm 2 .
4. The method according to claim 1, wherein the equiaxed crystal structure of the cast strand has a volume fraction of 30% -70%, and the columnar crystal structure of the cast strand has a volume fraction of 30% -70%.
5. The method according to claim 4, wherein the average particle size of the equiaxed crystals is 2000-4500 μm and the average particle size of the columnar crystals is 3000-7000 μm.
6. An oriented silicon steel prepared by the method of any one of claims 1 to 5.

Description

Method for preparing oriented silicon steel and oriented silicon steel Technical Field The application belongs to the technical field of steel product preparation, and particularly relates to a method for preparing oriented silicon steel and the oriented silicon steel. Background The oriented silicon steel is a Si-Fe soft magnetic material with {110} texture (namely Goss texture) containing about 3% of Si element by mass fraction, is a functional material of high-end electric power equipment, and is widely applied to the fields of ultra-high voltage transmission, advanced large-scale generators and the like. At present, the main production processes of the oriented silicon steel comprise continuous casting, plastic working (hot rolling and cold rolling) and heat treatment processes (normalizing, decarburization annealing and high-temperature annealing). In the related art, the prepared oriented silicon steel has obvious linear crystal defects and lower magnetic performance. Disclosure of Invention In view of the above, the application provides a method for preparing oriented silicon steel and oriented silicon steel, and aims to provide a preparation method and a product which can be used for preparing oriented silicon steel and have good magnetic performance and internal quality. In a first aspect, an embodiment of the present application provides a method for preparing oriented silicon steel, including: Continuously casting the molten steel through a crystallizer to obtain a casting blank, wherein unidirectional pulse current is applied to the molten steel in the crystallizer; carrying out hot rolling on a casting blank to obtain a hot rolled coil; And carrying out subsequent treatment on the hot rolled coil to obtain the oriented silicon steel. According to an embodiment of one aspect of the present application, the unidirectional pulse current has a current intensity of-2000A to 0A and a frequency of 1HZ to 100HZ. According to an embodiment of one aspect of the present application, the unidirectional pulse current has a current of 0A to 2000A and a frequency of 1HZ to 100HZ. According to an embodiment of one aspect of the application, the unidirectional pulsed current has a voltage of-30 to 0V. According to an embodiment of one aspect of the present application, the means for applying unidirectional pulse current to molten steel in a mold comprises one side connected to a power source in communication with the molten steel of the mold through an electrode and the other side connected to the power source in communication with a straightening roll in continuous casting through a wire. According to an embodiment of an aspect of the present application, the electrode is inserted into the molten steel of the mold to a depth of 10cm to 400cm. According to an embodiment of an aspect of the application, the electrode comprises any one of a metal ceramic electrode, a graphite electrode and an electrode with the same material as the water gap of the crystallizer. According to an embodiment of one aspect of the application, the wire comprises a metal wire having a cross section of ≡100mm 2. According to an embodiment of one aspect of the application, the volume fraction of the equiaxed crystal structure of the casting blank is 30-70%, and the volume fraction of the columnar crystal structure of the casting blank is 30-70%. According to the embodiment of one aspect of the application, the molten steel comprises, by mass, less than or equal to 0.0050% of C, 2.8% -3.8% of Si, 0.05% -0.2% of Mn, less than or equal to 0.010% of P, less than or equal to 0.0030% of S, less than or equal to 0.0040% of N, 0.5% -1.3% of Als, less than or equal to 0.0020% of Ti, nb and V respectively, and the balance of Fe and other unavoidable impurity elements. In a second aspect, an embodiment of the present application provides an oriented silicon steel, which is prepared by the method of the first aspect. Compared with the prior art, the application has at least the following beneficial effects: According to the method provided by the application, the unidirectional pulse current is applied to the molten steel in the crystallizer, so that the types and the contents of metallographic structures in the casting blank can be changed, and strip structures are generated less or not when the casting blank is subjected to a subsequent rolling process, thereby improving the magnetic performance and the internal quality of the prepared oriented silicon steel, such as linear crystal defects. Drawings In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and other drawings may be obtained according to the drawings without inventive effort for a person skilled in the art. Fig. 1 shows a s