Soft magnetic steel having excellent forging characteristic soft magnetic part and method of manufacturing the same

A manufacturing method and forging technology, applied in the field of soft magnetic steel, can solve the problems of uneven structure, material forging deterioration, abnormal grain growth, etc., to minimize the limitation of processing conditions, improve forging, and expand the scope of Effect

Active Publication Date: 2016-08-24
浦项控股股份有限公司
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Problems solved by technology

However, there is a problem that the forgeability of the material deteriorates due to the solid solution strengthening effect caused by the addition of Si.
[0006] At the same time, due to the low amount of carbides in soft magnetic steel, abnormal grain growth occurs when heat treatment is performed af

Method used

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  • Soft magnetic steel having excellent forging characteristic soft magnetic part and method of manufacturing the same
  • Soft magnetic steel having excellent forging characteristic soft magnetic part and method of manufacturing the same
  • Soft magnetic steel having excellent forging characteristic soft magnetic part and method of manufacturing the same

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Embodiment Construction

[0072] Hereinafter, the present invention will be described more specifically by way of examples. However, the following examples are merely examples for further explaining the present invention in detail, and are not intended to limit the scope of claims of the present invention. The scope of the claims of the present invention is determined based on the content described in the claims and the content reasonably derived therefrom.

[0073] Steels having the composition systems described in Table 1 below were cast. Then, heating at a temperature of 1150° C. and hot rolling were performed according to a general method to manufacture rods each having a diameter of 50 mm. The hot-rolled bar with a diameter of 50 mm was then cooled at a temperature of 1050°C at a rate of 5°C / sec.

[0074] Claw poles for automotive alternator rotors were fabricated from the bars. A bar with a diameter of 50 mm was cut with a weight of 1.2 kg, heated at a temperature of 1200° C., and hot forged i...

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Abstract

The present invention relates to soft magnetic steel materials and a soft magnetic steel member excellent in forgeability and excellent in electromagnetic characteristics, and a method of manufacturing the same, which uses AlN in a microstructure to suppress the possibility of abnormal grain growth during hot forging or after cold forging. The soft rolled steel materials excellent in forgeability according to one aspect of the present invention comprise, in % by weight, C: 0.001 to 0.02%, Mn: 0.1 to 1.2%, Si: 0.2 to 1.2%, Al:0.01 to 0.1%, N:0.005 to 0.015%, P:0.02% or less, S: 0.02% or less, and the unavoidable impurities, and satisfy the following relational expression 1, the microstructure is single-phase ferrite, and in[Relation1]: Al / N>= 2, wherein Al and N are contents indicating the content of each element (weight%).

Description

technical field [0001] The present invention relates to a soft magnetic steel material, a soft magnetic steel part, and a manufacturing method thereof, which are excellent in electromagnetic characteristics and excellent in forgeability and can be used in parts of electrical equipment such as automobiles. Background technique [0002] In order to improve the energy efficiency required by environmental laws and regulations, it is necessary to improve the electromagnetic characteristics of steel materials used for electrical equipment parts such as automobiles. Electromagnetic properties required for steel materials used as materials for parts of electrical equipment include, for example, high magnetic permeability, high magnetic flux density, and low iron loss. In addition, depending on the application and shape to which the component is applied, a certain level of strength, hot forgeability, and cold forgeability are required. Therefore, generally used steel materials are l...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C21D8/06H01F1/147
CPCC21D8/065C21D2211/005C22C38/02C22C38/04C22C38/06H01F1/14791C21D8/1222C21D8/1261C22C38/001
Inventor 全英洙李世日朴秀东李炯直金智铉
Owner 浦项控股股份有限公司
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