Soft magnetic wires and soft magnetic components

A tailored chemical composition and microstructure for soft magnetic wires enhance cold forgeability and pickling properties, addressing the limitations of existing ultra-low carbon steel materials.

JP2026086092APending Publication Date: 2026-05-26KOBE STEEL LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
KOBE STEEL LTD
Filing Date
2024-11-14
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing soft magnetic wires and components face challenges with insufficient cold forgeability, pickling properties, and magnetic properties, particularly in ultra-low carbon steel materials used for complex component shapes and high processing rates.

Method used

A specific chemical composition and microstructure are developed, including a ferrite content of 95% or more, controlled grain size, and reduced scale thickness, with elements like Si, Mn, and controlled impurities to enhance magnetic properties, cold forgeability, and pickling resistance.

Benefits of technology

The solution results in soft magnetic wires and components with improved magnetic properties, excellent cold forgeability, and effective pickling properties, enabling high processability and maintaining magnetic performance.

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Abstract

To provide soft magnetic wires and soft magnetic components with excellent magnetic properties, excellent cold forgeability, and excellent pickling resistance. [Solution] A soft magnetic wire that satisfies a predetermined chemical composition, has a metal structure containing 95% or more ferrite by area, has an average crystal grain size number of ferrite of 9.0 or less, has a coarse grain ratio of 25% or less in the surface layer, and has a scale thickness of 20 μm or less, wherein the thickness of the Si-based scale of the scale is 0 μm or more and 1.10 μm or less.
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