Non-oriented electrical steel sheets, cores, and rotating electrical machines

A non-oriented electrical steel sheet with a {411} orientation and optimized chemical composition addresses manufacturing burdens and alignment issues, achieving low stress sensitivity and improved magnetic properties in ±45-degree directions for enhanced core and machine performance.

JP7883188B2Active Publication Date: 2026-07-01NIPPON STEEL CORPORATION
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
NIPPON STEEL CORPORATION
Filing Date
2024-04-05
Publication Date
2026-07-01

AI Technical Summary

Technical Problem

Existing electromagnetic steel sheets face challenges in achieving low iron loss and high magnetic flux density while maintaining plate thickness, with manufacturing methods like rapid cooling causing high manufacturing burdens and inadequate alignment of α fibers, leading to insufficient magnetic properties in directions deviated from the rolling direction.

Method used

Developing a non-oriented electrical steel sheet with a specific {411} plane orientation, controlled chemical composition, and optimized manufacturing processes such as increased heating rates and finish annealing temperatures to enhance magnetic properties in directions ±45 degrees to the rolling direction, reducing stress sensitivity.

Benefits of technology

The solution results in a steel sheet with low stress sensitivity and improved magnetic properties in ±45-degree directions, suitable for manufacturing cores and rotating electric machines with enhanced performance.

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Abstract

This non-oriented electromagnetic steel sheet contains, in mass %, C: 0.0100% or less, Si: 1.50-4.00%, sol. Al: 0.0001-1.00%, S: 0.0100% or less, N: 0.0100% or less, and one or more selected from the group consisting of Mn, Ni, and Cu: total of 2.50-5.00%. When, in mass%, Mn content is taken to be [Mn], the Ni content is taken to be [Ni], the Cu content is taken to be [Cu], the Si content is taken to be [Si], the sol. Al content is taken to be [sol. Al], and the P content is taken to be [P], the non-oriented electromagnetic steel sheet has a chemical composition that satisfies (2 × [Mn] + 2.5 × [Ni] + [Cu]) - ([Si] + 2 × [sol. Al] + 4 × [P]) ≥ 1.50%. A411-011 is 15.0% or more, B50D is 1.70T or more, and W10D / 400D is 10.4 W / kg or less.
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