Claims
- 1. A process for producing a non-oriented electrical steel exhibiting a watt loss (W.sub.15/50) of at most 4.5 W/kg and a magnetic flux density B.sub.50 of at least 1.71 Tesla, said steel consisting essentially of:
- ______________________________________carbon at most 0.015%silicon 0.3% to 2.0%tin 0.02% to 0.20%acid-soluble aluminum 0.005% to 0.10%nitrogen at most 0.007%boron at most 0.005%______________________________________
- provided that the weight ratio of the boron to nitrogen is from 0.5 to 1.5, balance iron and unavoidable impurities, said process comprising the successive steps of:
- (1) hot-rolling a silicon steel having the composition as specified above;
- (2) annealing the hot-rolled steel strip;
- (3) cold-rolling the annealed steel strip at least once with an intermediate annealing; and
- (4) continuously annealing the cold-rolled steel strip.
- 2. A process according to claim 1, wherein said annealing of the hot-rolled steel strip is carried out by means of coiling the hot-roll strip at a temperature of at least 700.degree. C. and self-annealing the coiled hot-rolled steel strip.
- 3. A process according to claim 1, wherein said annealing of step (2) is carried out at a temperature of at least 850.degree. C.
- 4. A process according to claim 1, wherein said continuously annealed cold-rolled steel strip of step (4) is subjected to an additional step of:
- (5) skin pass rolling at a reduction rate of from 2% to 10%.
Priority Claims (1)
Number |
Date |
Country |
Kind |
57-10211 |
Jan 1982 |
JPX |
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Parent Case Info
This is a continuation in part application of U.S. Ser. No. 460,844 filed Jan. 25, 1983, now abandoned.
US Referenced Citations (5)
Foreign Referenced Citations (4)
Number |
Date |
Country |
0019849 |
Mar 1980 |
EPX |
2249957 |
Apr 1975 |
FRX |
54-163720 |
Dec 1979 |
JPX |
2005718A |
Jul 1979 |
GBX |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
460844 |
Jan 1983 |
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