Non-oriented silicon steel and manufacturing process thereof

US10176910B2 · kind B2 · utility

Assignee

• BAOSHAN IRON & STEEL CO., LTD. · CN

Inventors

• Shishu Xie · Shanghai, CN
• Xiandong Liu · Shanghai, CN
• Xiao Chen · Shanghai, CN
• Hongxu Hei · Shanghai, CN
• Bo Wang · Shanghai, CN
• Aihua Ma · Shanghai, CN
• Liang Zou · Beijing, CN
• Huawei Zhang · Xiamen, CN
• Wei Cao · Milpitas, US
• Feng Zhang · 南丰镇, CN
• Junliang Liu · Longbeilingcun, CN

Key dates

• Filing date: Dec 11, 2012
• Grant date: Jan 8, 2019
• Expiry date: Mar 21, 2035

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C21D8/1233
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The present invention provides a non-oriented silicon steel with excellent magnetic properties and a manufacturing process therefor. During the manufacturing process of the present invention, the temperature T of the molten steel of steel tapped from a converter during steelmaking and the carbon content [C] and the free oxygen content [O] comply with the following formula: 7.27×103≤[O][C]e(−5000/T)≤2.99×104, and the final annealing step uses tension annealing at a low temperature for a short time. A non-oriented silicon steel with a low iron loss, and excellent anisotropy of iron loss can be obtained by means of the manufacturing process of the present invention.