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A method for preparing non-oriented silicon steel with high magnetic induction and high strength based on thin strip continuous casting

A technology of oriented silicon steel and high magnetic induction, applied in the field of metallurgy, can solve the problems of low magnetic induction and iron loss, low sensitivity to harmful elements, and increased strength of high silicon steel, so as to improve magnetic properties, improve purity, and improve performance. Effect

Active Publication Date: 2017-09-29
NORTHEASTERN UNIV LIAONING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

4. For brittle materials that are difficult to process, the traditional production process is prone to defects such as cracks, while the casting and rolling process can not only meet the thickness requirements of the finished material, but also have extremely low sensitivity to harmful elements, and the solidified strip steel has almost no cracks. Segregation and quality defects easily produced by traditional methods
[0007] With the increase of silicon content in non-oriented silicon steel, the iron loss decreases, the magnetic induction decreases, but the strength increases. At the same time, silicon is a brittle element. The more it is added, the more difficult it is to carry out subsequent processing; Contradictions lead to low-silicon non-oriented silicon steel having the characteristics of high magnetic induction, high iron loss, and low strength, while high-silicon steel has low magnetic induction and iron loss and high strength; in view of the current demand for high magnetic induction and high strength of non-oriented silicon steel products, How to produce non-oriented silicon steel with high magnetic induction and excellent mechanical properties has become a difficult problem

Method used

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  • A method for preparing non-oriented silicon steel with high magnetic induction and high strength based on thin strip continuous casting
  • A method for preparing non-oriented silicon steel with high magnetic induction and high strength based on thin strip continuous casting
  • A method for preparing non-oriented silicon steel with high magnetic induction and high strength based on thin strip continuous casting

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Molten steel is smelted according to the set composition, and its composition contains C 0.001%, Si3.5%, Mn 0.2%, Alt1.0%, Ni 0.4%, Cr 4%, Sn 0.02%, O 0.003%, S 0.004% by weight percentage , N 0.004%, P 0.005%, the balance is Fe;

[0047] The molten steel is poured into the twin-roll strip continuous casting device through the sprue, tundish and distribution nozzle for continuous casting. The tundish preheating temperature is 1200°C, the molten steel temperature is 1580°C when pouring, and the casting roll speed is 70m / min to obtain the thickness 2.5mm cast strip; the metallographic microstructure of the cast strip is as follows figure 2 shown;

[0048] After the cast strip comes out of the casting roll, it is cooled to room temperature for the second time by air cooling, and then hot-rolled in a single pass. The hot rolling start temperature is 950°C, and the reduction is 30%. After hot rolling, it is air-cooled to room temperature to obtain a hot-rolled sheet ;

...

Embodiment 2

[0052] The molten steel is smelted according to the set composition, and its composition contains C 0.002%, Si 3.3%, Mn 0.6%, Alt 0.85%, Ni 0.9%, Cr 3.3%, Sn 0.08%, O 0.003%, S 0.005% by weight percentage, N 0.002%, P 0.005%, the balance is Fe;

[0053] The molten steel is poured into the twin-roll strip continuous casting device through the sprue, tundish and distribution nozzle for continuous casting. The tundish preheating temperature is 1100°C, the molten steel temperature is 1520°C when pouring, and the casting roll speed is 50m / min. 2mm cast belt;

[0054] After the cast strip comes out of the casting roll, it is cooled to room temperature for the second time by air cooling, and then hot rolled in a single pass. The hot rolling start temperature is 950°C, and the reduction is 20%. After hot rolling, it is air cooled to room temperature to obtain a hot rolled sheet ;

[0055] The hot-rolled sheet is pickled to remove surface oxide scale, and then 6 passes of cold rollin...

Embodiment 3

[0058] The molten steel is smelted according to the set composition, and its composition contains C 0.003%, Si 3.0%, Mn 0.9%, Alt0.66%, Ni 1.7%, Cr 2.6%, Sn 0.13%, O 0.004%, S 0.003% by weight percentage, N 0.003%, P 0.004%, the balance is Fe;

[0059] The molten steel is poured into the twin-roll strip continuous casting device through the sprue, tundish and distribution nozzle for continuous casting. The tundish preheating temperature is 1200°C, the molten steel temperature is 1580°C when pouring, and the casting roll speed is 80m / min to obtain the thickness 2.4mm cast belt;

[0060] After the cast strip comes out of the casting roll, it is cooled to room temperature for the second time by air cooling, and then hot rolled in a single pass. The hot rolling start temperature is 1000°C, and the reduction is 40%. After hot rolling, it is air cooled to room temperature to obtain a hot rolled sheet ;

[0061] The hot-rolled sheet was pickled to remove surface oxide scale, and th...

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Abstract

The invention discloses a method for preparing high-magnetic induction and high-strength non-oriented silicon steel based on thin strip continuous casting, and belongs to the technical field of metallurgy. The method comprises the following steps: (1) molten steel is smelted according to set components, and comprises the following components in percentage by weight: 0.001-0.005% of C, 2.4-3.5% of Si, 0.2-2% of Mn, 0.35-1.0% of Alt, 0.4-3% of Ni, 0.5-4% of Cr, 0.02-0.2% of Sn, O not more than 0.005%, S not more than 0.005%, N not more than 0.005%, P not more than 0.005%, and the balance of Fe; (2) the molten steel is cast in a double-roller thin strip continuous casting device for continuous casting; (3) a cast strip is secondarily cooled to reach room temperature, and is hotly rolled by singly gate; (4) the cold rolling is performed after acid washing; and (5) finally, the annealing treatment is performed; an insulation coating layer is coated online; and the winding is performed at last. The method can exert inherent advantages of thin strip continuous casting to the greatest extent, improves the magnetic performance and the mechanical performance of thin strip continuous casting electrical steel products, and is simple in preparation, environment-friendly and energy-saved in production process, low in investment cost and high in production efficiency.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for preparing non-oriented silicon steel with high magnetic induction and high strength based on thin strip continuous casting. Background technique [0002] With the intensification of global environmental pollution, climate issues have become one of the important factors that must be considered in the industrial development of various countries. my country is a country with a large population and consumption. Energy and environmental issues are thorny issues in the 21st century. In recent years, the country has vigorously advocated the development of clean energy. It is against this background that green and environmentally friendly new energy electric vehicles have developed rapidly and will become the mainstream of future automobile development. The core of electric vehicles lies in the use of high-speed drive motors. [0003] The high-speed drive mot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/08C22C38/18C21D8/12
CPCC21D8/1222C21D8/1233C21D8/1272C22C38/004C22C38/008C22C38/02C22C38/04C22C38/06C22C38/08C22C38/18
Inventor 王郁倩张晓明段军阳曹光明李成刚刘曦何禛刘振宇王国栋
Owner NORTHEASTERN UNIV LIAONING
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