Grain-oriented silicon steel with low core loss and manufacturing method therefore

US11638971B2 · kind B2 · utility

Assignee

• BAOSHAN IRON & STEEL CO., LTD. · CN

Inventors

• Meihong Wu · Shanghai, CN
• Zipeng Zhao · Shanghai, CN
• Guobao Li · Shanghai, CN
• Kanyi Shen · Shanghai, CN
• Zhuochao Hu · Shanghai, CN
• Chen Ling · Sunnyvale, US
• Huande Sun · Shanghai, CN
• Huabing Zhang · Shanghai, CN

Key dates

• Filing date: Jan 24, 2018
• Grant date: May 2, 2023
• Expiry date: Jun 4, 2039

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01F27/245
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

A grain-oriented silicon steel with low iron loss, wherein the silicon steel is provided with a plurality of grooves on its surface, each of the grooves is 10-60 μm in width and 5-40 μm in depth, and the spacing between adjacent grooves is 1-10 mm. The manufacturing method therefor comprises: scoring the surface of the grain-oriented silicon steel with low iron loss by using a laser in order to form the grooves. The grain-oriented silicon steel with low iron loss can maintain the magnetic domain refining effect in a stress-relief annealing process, and avoid the introduction of more residual stress.