Non-oriented silicon steel and its manufacturing method

A technology of oriented silicon steel and manufacturing method, applied in the direction of inorganic material magnetism, magnetic objects, magnetic materials, etc., to achieve the effect of improving grain shape, high magnetic permeability, and low iron loss

Active Publication Date: 2015-09-23
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Although the above prior art has made some progress in improving the magnetic permeability and iron loss of non-oriented silicon steel, there is still a large room for improvement in the magnetic permeability and iron loss of non-oriented silicon steel under the working flux density of 1.0-1.5T

Method used

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  • Non-oriented silicon steel and its manufacturing method
  • Non-oriented silicon steel and its manufacturing method
  • Non-oriented silicon steel and its manufacturing method

Examples

Experimental program
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Effect test

Embodiment 1

[0054] Firstly, a cast slab containing the following components by weight percentage is obtained through steelmaking: C 0.0035%, Si 0.85%, Al 0.34%, Mn 0.3 1%, P 0.023%, S 0.0027%, N 0.0025%, and the rest is iron and Unavoidable impurities; RH refining is used in steelmaking, and RH refining uses Al as a deoxidizer for deoxidation treatment. In Example 1, the weight of molten steel in the ladle is 285 tons, the free oxygen content at the end of decarburization is 550 ppm, and the input amount of Al is 125 kg.

[0055] Then, the cast slab is hot-rolled to form a hot-rolled steel strip, wherein the final rolling temperature is above 800° C., and the thickness of the hot-rolled steel strip after hot-rolling is 2.6 mm.

[0056] Then the hot-rolled steel strip is subjected to normalized high-temperature short-term treatment, that is, the hot-rolled hot-rolled steel strip is heated to 980°C for 20 seconds, and then cooled to 650°C at a cooling rate of about 15°C / s. °C, followed by ...

Embodiment 2

[0060] The non-oriented silicon steel was produced by the same method as in Example 1, except that the free oxygen content and Al input amount at the end of decarburization were changed to 400ppm and 87.5kg respectively.

Embodiment 3

[0062] Non-oriented silicon steel was manufactured in the same manner as in Example 1, except that the free oxygen content and Al input amount at the end of decarburization were changed to 300ppm and 62.5kg respectively.

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Abstract

An unoriented silicion steel having high magnetic conductivity and low iron loss at a working magnetic density of 1.0-1.5 T and method for manufacturing same. By proper deoxidation control in a RH refining and high-temperature treatment for a short time in a normalizing step, the method can reduce the amount of inclusions in the silicon steel and improve grain shape, so as to improve the magnetic conductivity and iron loss of the unoriented silicon steel at a magenetic density of 1.0-1.5 T.

Description

technical field [0001] The invention relates to a non-oriented silicon steel and a manufacturing method thereof, in particular to a non-oriented silicon steel with higher magnetic permeability and lower iron loss at a working magnetic density of 1.0-1.5T and a manufacturing method thereof. Background technique [0002] Non-oriented silicon steel with high magnetic permeability and low iron loss can be widely used as iron core in rotating machines such as compressor motors, electric vehicle motors and small precision motors, and can also be widely used in static devices such as small power transformers and voltage stabilizers middle. In recent years, as people's demand for portability has increased and non-renewable energy sources such as coal and oil have gradually decreased, electronic equipment has been required to be miniaturized and energy-saving. As far as the miniaturization of electronic equipment is concerned, the non-oriented silicon steel used is required to have ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C33/04C21D8/12
CPCC22C38/02C21D8/12C22C38/04C21D2201/05C22C38/004H01F1/14791C22C38/14C21D8/1233C22C38/06C21C7/0006C22C38/12C21D8/1205C22C33/04C21C7/06C22C38/001C21D8/1261H01F1/16C21C7/0645C22C38/002
Inventor 邹亮王波刘献东马爱华谢世殊黑红旭
Owner BAOSHAN IRON & STEEL CO LTD
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