Non-oriented electrical steel sheet and method for manufacturing non-oriented electrical steel sheet

A non-oriented electrical steel sheet with controlled alloy components and a tailored manufacturing process addresses the balance of mechanical properties, ensuring high tensile strength and elastic stability for electric motor applications, improving motor core performance and process efficiency.

WO2026029387A1 Publication Date: 2026-02-05HYUNDAE STEEL CO LTD
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Patent Information

Application Number
PCT/KR2025/008887
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-07-29
Filing Date
2025-06-25
Publication Date
2026-02-05

AI Technical Summary

Technical Problem

Existing non-oriented electrical steel sheets used in electric motors for eco-friendly vehicles do not adequately balance mechanical properties such as elasticity, tensile strength, and ductility, which are crucial for high-speed operation and stability, especially when subjected to centrifugal and multi-axial loads.

Method used

A non-oriented electrical steel sheet composition with controlled alloy components, including specific amounts of silicon, manganese, aluminum, scandium, hafnium, tantalum, and other elements, along with a manufacturing process involving hot-rolling, annealing, and cold-rolling, to achieve a balanced shear modulus and bulk modulus ratio, ensuring high tensile strength and elastic properties.

Benefits of technology

The solution results in a steel sheet with improved mechanical stability and durability, suitable for motor cores, maintaining ductility while resisting transverse torsion under tensile and compressive loads, thus enhancing the performance and process economy of electric motor laminates.

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Abstract

A non-oriented electrical steel sheet according to an embodiment comprises 2.0 to 3.8 wt% of silicon (Si), 0.5 wt% or less (excluding 0) of manganese (Mn), 0.6 wt% or less (excluding 0) of aluminum (Al), 0.0015 wt% or less of scandium (Sc), 0.0015 wt% or less of hafnium (Hf), 0.0015 wt% or less of tantalum (Ta), and the balance being iron (Fe) and other inevitable elements, and thus may have mechanical properties suitable for use as a motor core material.
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