Manufacture method of high-efficiency non-oriented silicon steel with excellent magnetic performance

Patent metadata

Field	Value
Publication number	US-9816152-B2
Application number	US-201113637611-A
Country	US
Kind code	B2
Filing date	Apr 27, 2011
Priority date	Oct 25, 2010
Publication date	Nov 14, 2017
Grant date	Nov 14, 2017

Abstract

A manufacture method of high-efficiency non-oriented silicon steel with excellent magnetic property includes the steps of smelting a chemical composition of non-oriented silicon steel, by weight percent, is: C≦0.0040%, Si:0.1˜0.8%, Al:0.002˜1.0%, Mn:0.10˜1.50%, P:≦0.2%, Sb:0.04˜0.08%, S≦0.0030%, N≦0.0020%, Ti≦0.0020%, and the rest is Fe and unavoidable inclusions. The molten steel is then cast into billets which are hot-rolled into a hot-rolled product. The heating temperature for the billet is 1100°˜1150° and the finish-rolling temperature is 860°˜920°. The hot-rolled product is then air cooled for a period of time within a range determined by air cooling time t: (2+30xSb %)s≦t≦7 s. The hot-rolled product is reeled at a temperature ≧720° and cold-rolled to form cold-rolled plate with a target thickness at a reduction ratio of 70˜78% followed by heating up the cold-rolled plate to 800˜1000° at heating rate of ≧15°/s, and holding time of 10 s˜25 s.

First claim

What is claimed is:

1. A manufacture method of non-oriented silicon steel,
said method comprising:
smelting a chemical composition of non-oriented silicon steel, which by weight percent, comprising: C≦0.0040%, Si:0.1-0.8%, Al:0.45-1.0%, Mn:0.10-1.50%, P:≦0.2%, Sb:0.055-0.08%, S≦0.0030%, N≦0.0020%, Ti≦0.0020%, and the rest is Fe and unavoidable impurities;
casting said composition into a billet;
hot rolling said billet into a hot-rolled product, wherein heating temperature for said billet is 1100° C.-1150° C. and finish-rolling temperature is 860° C.-920° C.;
air cooling said hot-rolled product for a period of time within a range determined by air cooling time t: (2+30xSb %)s<t<7 s;
reeling at a temperature ≧720° C.;
cold rolling said hot-rolled product to form cold-rolled plates with a target thickness at a reduction ratio of 70-78%; and
heating up the cold-rolled plates to 800-1000° C. at a heating rate of ≧15° C./s, with a holding time of 10-25 s.

2. The manufacture method of non-oriented silicon steel of claim 1 , in which said step of heating up is in an annealing atmosphere of (volume ratio 30%-70%)H 2 +(volume ratio 70%-30%)N 2 , and dew point is controlled at −25° C.-−40° C.

Assignees

• Ma Aihua
• Wang Bo
• Xie Shishu
• Hu Zhanyuan
• Zou Liang
• Wang Zitao
• Zhu Yuhua
• Huang Jie
• Jin Bingzhong
• Liu Xiandong
• Baoshan Iron & Steel

Inventors

• Ma Aihua
• Wang Bo
• Xie Shishu
• Hu Zhanyuan
• Zou Liang
• Wang Zitao
• Zhu Yuhua
• Huang Jie
• Jin Bingzhong
• Liu Xiandong

Classifications

• C21D8/00 Primary

  Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment (hardening articles or materials formed by forging or rolling with no further heating beyond that required for the formation C21D1/02) · CPC title

• C22C38/001

  containing N · CPC title

• C22C38/04

  containing manganese · CPC title

• C21D8/1261 Primary

  following hot rolling · CPC title

• C22C38/02

  containing silicon · CPC title