Manufacturing method of oriented SI steel with high electric-magnetic property

US8333846B2 · kind B2 · utility

Assignee

• BAOSHAN IRON & STEEL CO., LTD. · CN

Inventors

• Guohua Yang · San Jose, US
• Huande Sun · Shanghai, CN
• Yaming Ji · Shanghai, CN
• Guobao Li · Shanghai, CN
• Hongxu Hei · Shanghai, CN

Key dates

• Filing date: Mar 25, 2009
• Grant date: Dec 18, 2012
• Expiry date: Mar 25, 2029

Classification

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

Abstract

A manufacturing method of oriented Si steel with high electric-magnetic property comprises the following steps: smelting steel in converter or electric furnace; refining molten steel in two stages; continuous casting to obtain slab; hot rolling; first cold rolling; decarburizing annealing; secondary cold rolling; applying an annealing separator based on MgO and annealing at high temperature; applying an insulating coating and leveling tension annealing. The slab comprises (in wt %): C 0.020-0.050%, Si 2.6-3.6%, S 0.015-0.025%, Als 0.008-0.028%, N 0.005-0.020%, Mn 0.15-0.5%, Cu 0.3-1.2%, balance Fe and inevitable impurities, in which 10≦Mn/S≦20 and Cu/Mn≧2. The method could produce oriented Si steel with high magnetic induction intensity and low iron loss at low cost.