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

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...

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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 after hot forging or cold forging

This is because the amount of carbides and non-metallic inclusions that prevent the growth of grain boundaries (pinning effect) is small, and the problem of uneven structure accompanied by abnormal grain growth and the problem of deterioration of forgeability are caused.

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