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

A non-oriented electrical steel sheet with optimized alloying elements and manufacturing process enhances magnetic and mechanical properties, addressing the challenges of high flux density and low iron loss, with a yield strength of 380 MPa and iron loss of 13.5 W/kg or lower.

EP4752253A1Pending Publication Date: 2026-06-03HYUNDAE STEEL CO LTD
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Patent Information

Authority / Receiving Office
EP · EP
Patent Type
Applications
Current Assignee / Owner
HYUNDAE STEEL CO LTD
Filing Date
2024-07-17
Publication Date
2026-06-03

AI Technical Summary

Technical Problem

Existing non-oriented electrical steel sheets face challenges in achieving high magnetic flux density and low iron loss while maintaining mechanical strength and rollability, due to the addition of elements like silicon, aluminum, and manganese, which can degrade magnetic properties and increase production costs.

Method used

A non-oriented electrical steel sheet composition with specific alloying elements (Si, Mn, Al, C, S, P, N, Ti, Sn, Ni, Cu) and a manufacturing process involving hot and cold rolling, annealing, and controlled reheating temperatures to optimize magnetic and mechanical properties.

Benefits of technology

The solution results in a high-strength electrical steel sheet with excellent mechanical and magnetic properties, achieving a yield strength of 380 MPa and iron loss of 13.5 W/kg or lower, while ensuring rollability and productivity.

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Abstract

According to one embodiment of the present invention, a non-oriented electrical steel sheet and a method for manufacturing the non-oriented electrical sheet can be provided, the non-oriented electrical steel sheet including 2.8 to 3.8 wt% of silicon (Si), 0.2 to 0.5 wt% of manganese (Mn), 0.5 to 1.5 wt% of aluminum (Al), 0.005 wt% or less of carbon (C), 0.005 wt% or less of sulfur (S), 0.015 wt% or less of phosphorus (P), 0.005 wt% or less of nitrogen (N), 0.005 wt% or less of titanium (Ti), 0.08 wt% or less of tin (Sn), 0.07 wt% or less of nickel (Ni), 0.07 wt% or less of copper (Cu), and the balance of iron (Fe) and other inevitable impurities, satisfying relation 1, and having high strength and high efficiency. 3.0<logT<0.4 (T = 5 × [S] + 12 × [Ti] + 6 × [P] + 5 × [Sn] + 15 × [Ni] + 11 × [Cu], in which [S], [Ti], [P], [Sn], [Ni] and [Cu] represent the amounts (ppm) of S, Ti, P, Sn, Ni, and Cu, respectively.)
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