Claims
- 1. A process for preparing a semi-process non-oriented electromagnetic steel strip having a low core loss and a high magnetic permeability, comprising the steps of:
- heating a slab having a composition consisting essentially of, in % by weight,
- ______________________________________C: up to 0.02%,Si: 0.2 to 2.0%,Al: 0.1 to 0.6%,P: 0.02 to 0.10%,Mn: 0.5 to 1.5%,Ni: 0.1 to 1.0%, and optionally,Cu: up to 0.6%, and optionally,______________________________________
- one or both of Sb and Sn: 0.01 to 0.2%, and the balance iron and inevitable impurities, to a temperature in the range of from 1,100 to 1,200.degree. C.,
- hot rolling the slab into a strip at a finishing temperature of at least 700.degree. C. in the austenite region,
- coiling the strip,
- annealing the coiled strip at a temperature in the range of from 800.degree. to 880.degree. C. for at least one hour,
- cold rolling and annealing the strip, and
- skin pass rolling the annealed strip with a reduction rate of 2 to 12%.
- 2. A process for preparing a semi-process non-oriented electromagnetic steel strip having a low core loss and a high magnetic permeability, comprising the steps of:
- heating a slab having a composition consisting essentially of, in % by weight,
- ______________________________________C: up to 0.02%,Si: 0.2 to 2.0%,Al: 0.1 to 0.6%,P: 0.02 to 0.10%,Mn: 0.5 to 1.5%,Ni: 0.1 to 1.0%, and optionally,Cu: up to 0.6%, and optionally,______________________________________
- one or both of Sb and Sn: 0.01 to 0.2%, and the balance iron and inevitable impurities, to a temperature in the range of from 1,100.degree. to 1,200.degree. C.,
- hot rolling the slab into a strip at a finishing temperature of at least 700.degree. C. in the austenite region,
- coiling the strip,
- annealing the coiled strip at a temperature in the range of from 800.degree. to 880.degree. C. for at least one hour,
- cold rolling and annealing the strip.
- 3. A process for preparing a semi-process non-oriented electromagnetic steel strip having a low core loss and a high magnetic permeability, comprising the steps of:
- hot rolling a slab having a composition consisting essentially of, in % by weight,
- ______________________________________C: up to 0.02%,Si: 0.2 to 2.0%,Al: 0.1 to 0.6%,P: 0.02 to 0.10%,Mn: 0.5 to 1.5%,Ni: 0.1 to 1.0%,B: 0.0005 to 0.0040%, and optionally,Cu: up to 0.6%, and optionally,______________________________________
- one or both of Sb and Sn: 0.01 to 0.2%, and the balance iron and inevitable impurities, into a strip,
- coiling the strip,
- annealing the coiled strip at a temperature of at least 800.degree. C. in the austenite region for at least one minute,
- cold rolling and annealing the strip, and
- skin pass rolling the annealed strip with a reduction rate of 2 to 12%.
Priority Claims (1)
Number |
Date |
Country |
Kind |
62-150208 |
Jun 1987 |
JPX |
|
Parent Case Info
This is a division of application Ser. No. 07/207,198 filed June 16, 1988 now U.S. Pat. No. 4,946,519.
US Referenced Citations (8)
Foreign Referenced Citations (5)
Number |
Date |
Country |
49-38814 |
Aug 1974 |
JPX |
51-74923 |
Jun 1976 |
JPX |
56-34616 |
Aug 1981 |
JPX |
57-35628 |
Feb 1982 |
JPX |
61-67753 |
Apr 1986 |
JPX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
207198 |
Jun 1988 |
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