Preparation method of oriented high silicon steel

US10032548B2 · kind B2 · utility

Assignee

• Northwestern University · US

Inventors

• Guodong Wang · Changchun, CN
• Yuanxiang Zhang · Shenyang, CN
• Yang Wang · Huangshan, CN
• Xiang Lu · Shenyang, CN
• Feng Fang · Shenyang, CN
• Guangming CAO · Shenyang, CN
• Chenggang Li · Nanhu, CN
• Guo Yuan · Shenyang, CN
• Yunbo Xu · Dongying, CN
• Zhenyu Liu · Greensburg, US
• Zhaodong Wang · Mountain View, US

Key dates

• Filing date: Oct 20, 2014
• Grant date: Jul 24, 2018
• Expiry date: Oct 6, 2035

Classification

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

Abstract

The preparation method includes steps of (1) melting steel according to in weight percentage 0.001-0.003% of C, 5.0-6.6% of Si, 0.2-0.3% of Mn, 0.05-0.12% of Al, 0.01-0.04% of V, 0.03-0.06% of Nb, 0.02-0.03% of S, 0.009-0.020% of N, O which is less than or equal to 0.0020%, and the balance being Fe and unavoidable impurities; (2) forming cast strips after a thin-strip casting course; (3) hot-rolling the cast strips under inert atmosphere conditions; (4) cooling the hot-rolled cast strips to 550-600 DEG C., coiling and performing low-temperature hot rolling/warm rolling on the coiled cast strips under a nitrogen atmosphere condition; (5) removing oxidized scales though pickling, performing cold rolling multiple times; (6) performing recrystallization annealing, coating with an MgO layer, and coiling; (7) performing purification annealing under hydrogen circulation conditions; and (8) removing oxidized scales, coating with an insulating layer, performing flat stretch annealing, and air-cooled coiling.