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:
- at most 0.015%, of carbon,
- 0.3% to 2.0% of silicon,
- more than 1% up to 1.5% of manganese,
- 0.02% to 0.20% tin,
- more than 0.1% up to 0.20% acid-soluable aluminum, and
- balance composed of iron, and the unavoidable impurities
- said process comprising of successive steps of:
- (1) hot-rolling of said silicon steel having the aforesaid composition;
- (2) subsequently self annealing the hot-rolled strip of said silicon steal by coiling the hot-rolled strip of said silicon steel at a temperature not lower than 700.degree. C.;
- (3) cold-rolling the thus annealed steel strip at least once with an intermediate annealing in a case of annealing more than once; and
- (4) continuously annealing the cold-rolled steel strip.
- 2. 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 fux 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%
- manganese: more than 1% up to 1.5%
- acid-soluable aluminum: 0.005% to 0.10%
- nitrogen: at most 0.007%
- boron: at most 0.005%
- wherein the weight ratio of boron content/nitrogen content is from 0.5 to 1.5, and the balance of said composition is iron and unavoidable impurities, said process comprising the successive steps of:
- (1) hot-rolling of silicon steel having the composition as specified above;
- (2) after the hot-rolling, coiling the hot-rolled strip at a temperature not lower than 700.degree. C. so as to carry out a self-annealing, or annealing the hot-rolled strip at a temperature not lower than 850.degree. C.;
- (3) cold-rolling the annealed steel strip at least once with an intermediate annealing in a case of annealing more than once; and
- (4) continuously annealing the cold-rolled steel strip.
- 3. A process according to claim 1, wherein the cold-rolled and then continuously annealed steel strip is further subjected to a skin-pass rolling at a reduction rate of from 2 to 10%.
- 4. A process according to claim 2, wherein the cold-rolled and then continuously annealed steel strip is further subjected to a skin-pass rolling at a reduction rate of from 2 to 10%.
- 5. A process according to claim 1, wherein the manganese is present in an amount greater than about 1.3%.
- 6. A process for producing a non-oriented electrical steel exhibiting a watt loss (W.sub.15/50) of at most 4.5 Wkg and a magnetic flux density B.sub.50 of at least 1.71 Tesla, said steel consisting essentially of:
- at most 0.015% of carbon,
- 0.3% to 2.0% of silicon,
- more than 1% up to 1.5% of manganese,
- 0.02% to 0.20% tin,
- more than 0.1% up to 0.20% of acid-soluable aluminum, and
- balance composed of iron and the unavoidable impurities,
- said process comprising of successive steps of:
- (1) hot-rolling of said silicon steel having the aforesaid composition;
- (2) subsequently annealing the hot-rolled strip of said silicon steel at a temperature not lower than 850.degree. C.;
- (3) cold-rolling the thus annealed steel strip at least once with an intermediate annealing in a case of anealing more than once; and
- (4) continuously annealing the cold-rolled steel strip.
Priority Claims (1)
Number |
Date |
Country |
Kind |
57-10211 |
Jan 1982 |
JPX |
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Parent Case Info
This is a division of application Ser. No. 614,139 filed May 25, 1984, which in turn is a continuation-in-part of U.S. Ser. No. 460,844 filed Jan. 25, 1983, now abandoned.
US Referenced Citations (9)
Foreign Referenced Citations (5)
Number |
Date |
Country |
0019849 |
Oct 1980 |
EPX |
2249957 |
May 1975 |
FRX |
58-9927 |
Jan 1983 |
JPX |
58-34134 |
Feb 1983 |
JPX |
2005718 |
Apr 1979 |
GBX |
Divisions (1)
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Number |
Date |
Country |
Parent |
614139 |
May 1984 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
460844 |
Jan 1983 |
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