Manufacturing method of common grain-oriented silicon steel with high magnetic induction

US9905361B2 · kind B2 · utility

Assignee

• BAOSHAN IRON & STEEL CO., LTD. · CN

Inventors

• Kanyi Shen · Shanghai, CN
• Guobao Li · Shanghai, CN
• Shuangjie Chu · Shanghai, CN
• Yezhong Sun · Shanghai, CN
• Huabing Zhang · Shanghai, CN
• Yongjie Yang · Shanghai, CN
• Zhuochao Hu · Shanghai, CN
• Bin Zhao · Nanhu, CN
• Qi Xu · Shanghai, CN
• Jie Huang · Shanghai, CN
• Peili Zhang · Shanghai, CN

Key dates

• Filing date: Dec 11, 2012
• Grant date: Feb 27, 2018
• Expiry date: Dec 24, 2033

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C21D2201/05
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A manufacturing method of oriented silicon steel with magnetic induction B8 of not less than 1.88 T, comprising the following steps: 1) smelting and continuous casting to obtain a slab, wherein the content of N is controlled at 0.002-0.014 wt % in the smelting stage; 2) hot-rolling; 3) cold-rolling; 4) decarbonizing and annealing; 5) nitriding treatment, wherein infiltrated nitrogen content [N]D is controlled to satisfy the formula: 328−0.14a−0.85b−2.33c≦[N]D≦362−0.16a−0.94b−2.57c, wherein a is the content of Als in the smelting step, with the unit of ppm; b is the content of N element, with the unit of ppm; and c is primary grains size, with the unit of μm; 6) coating a steel's surfaces with a magnesium oxide layer and annealing; and 7) applying an insulating coating.