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Title: US4623406: Method for producing a grain-oriented electrical steel sheet having a high magnetic flux density
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Country: US United States of America

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13 pages

 
Inventor: Suga, Yozo; Kitakyushu, Japan
Matsumoto, Fumio; Kawasaki, Japan
Nakayama, Tadashi; Kitakyushu, Japan

Assignee: Nippon Steel Corporation, Tokyo, Japan
other patents from NIPPON STEEL CORP. (403660) (approx. 1,879)
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Published / Filed: 1986-11-18 / 1983-09-21

Application Number: US1983000534290

IPC Code: Advanced: C21D 8/12; C22C 38/00; C22C 38/02; C22C 38/06; H01F 1/16;
Core: H01F 1/12; more...
IPC-7: H01F 1/04;

U.S. Class: Current: 148/111; 148/308; 420/117;
Original: 148/111; 148/308; 420/117;

Field of Search: 148/110,111,112,113,31.55 075/123 B,123 D,123 L

Priority Number:
1982-09-24  JP1982000165065

Abstract: The present invention relates to a method for producing a grain-oriented electrical steel sheet. A feature of the present invention is to set S<=0.007%, Mn=0.08~0.45%, P=0.015~0.45% in a slab. The present inventive idea does away with the conventional concept of using MnS as an inhibitor. The present invention present incomplete secondary recrystallization by the S content, which is decreased to a level as low as possible. In addition, a product having a high magnetic flux density can be successfully produced by adding appropriate amounts of Mn and P. Due to these advantages a high Si content of a slab, which leads to a watt loss reduction, can also be employed in the present invention. Furthermore, the watt loss of a product produced by a low-temperature slob-heating is considerably lower than a product produced by a high-temperature slab-heating.

Attorney, Agent or Firm: Kenyon & Kenyon ;

Primary / Asst. Examiners: Sheehan, John P.;

Maintenance Status: CC Certificate of Correction issued

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First Claim:
Show all 4 claims
We claim:     1. A method for producing a grain-oriented electrical steel sheet having high magnetic flux density in terms of B10 of 1.89 Tesla or more comprising the steps of:
  • heating, to a temperature of from more than 1280° C. to 1430° C., a slab which essentially consists of from 0.025% to 0.075% of C, from 3.0% to 4.5% of Si, from 0.01% to 0.060% of acid soluble aluminum, from 0.0030% to 0.0130% of N, not more than 0.007% of S, from 0.08% to 0.45% of Mn, and from 0.015% to 0.045% of P, the balance being Fe;
  • subsequently hot rolling said slab to form a hot-rolled strip;
  • annealing said hot-rolled strip in a temperature in the range of from 850° C. to 1200° C. for a short period of time;
  • subsequently heavily cold-rolling the annealed strip at a reduction of not less than 80%, thereby obtaining the final sheet thickness;
  • continuously decarburization-annealing the obtained cold-rolled strip in a wet hydrogen atmosphere and then applying an annealing separator on the strip; and
  • subsequently carrying out a final high temperature annealing.


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Forward References: Show 4 U.S. patent(s) that reference this one

       
U.S. References: Go to Result Set: All U.S. references   |  Forward references (4)   |   Backward references (21)   |   Citation Link

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Patent  Pub.Date  Inventor Assignee   Title
Get PDF - 3pp US1773157* 1930-08 Wooldridge    
Get PDF - 3pp US2599340* 1952-06 Littmann et al.    
Get PDF - 5pp US2867557* 1959-01 Crede et al.    
Get PDF - 3pp US3278346* 1966-10 Goss    
Get PDF - 13pp US3287183* 1966-11 Taguchi et al.    
Get PDF - 11pp US3671337  1972-06 Kumai et al.   PROCESS FOR PRODUCING GRAIN ORIENTED ELECTROMAGNETIC STEEL SHEETS HAVING EXCELLENT MAGNETIC CHARACTERISTICS
Get PDF - 6pp US3764406  1973-10 Littmann   HOT WORKING METHOD OF PRODUCING CUBEON EDGE ORIENTED SILICON IRON FROM CAST SLABS
Get PDF - 6pp US3841924  1974-10 Sakakura et al.  Nippon Steel Corporation METHOD FOR PRODUCING A HIGH MAGNETIC FLUX DENSITY GRAIN ORIENTED ELECTRICAL STEEL SHEET
Get PDF - 12pp US3846187  1974-11 Sakakura et al.   SLAB AND PLATE COOLING METHOD FOR PRODUCING GRAIN ORIENTED ELECTRICAL STEEL
Get PDF - 9pp US3853641  1974-12 Sakakura et al.  Nippon Steel Corporation METHOD FOR PRODUCING SINGLE-ORIENTED SILICON STEEL SHEETS HAVING HIGH MAGNETIC INDUCTION
Get PDF - 6pp US3867211  1975-02 Easton  Armco Steel Corporation Low-oxygen, silicon-bearing lamination steel
Get PDF - 12pp US3932234  1976-01 Imanaka et al.  Kawasaki Steel Corporation Method for manufacturing single-oriented electrical steel sheets comprising antimony and having a high magnetic induction
Get PDF - 11pp US3933537  1976-01 Imanaka et al.  Kawasaki Steel Corporation Method for producing electrical steel sheets having a very high magnetic induction
Get PDF - 13pp US3940299  1976-02 Goto et al.  Kawasaki Steel Corporation Method for producing single-oriented electrical steel sheets having a high magnetic induction
Get PDF - 3pp US4023990  1977-05 Lex  Hoesch Werke Aktiengesellschaft Dynamo or electro band
Get PDF - 9pp US4108694  1978-08 Shiozaki et al.  Nippon Steel Corporation Continuously cast slabs for producing grain-oriented electrical steel sheets having excellent magnetic properties
Get PDF - 7pp US4299622  1981-11 Kimira et al.  Sony Corporation Magnetic alloy
Get PDF - 11pp US4302257  1981-11 Matsumoto et al.  Nippon Steel Corporation Process for producing a grain-oriented silicon steel sheet
Get PDF - 12pp US4319936  1982-03 Dahlstrom et al.  Armco Inc. Process for production of oriented silicon steel
Get PDF - 7pp US4439251  1984-03 Shimoyama et al.  Nippon Steel Corporation Non-oriented electric iron sheet and method for producing the same
Get PDF - 11pp US4456812  1984-06 Neiheisel et al.  Armco Inc. Laser treatment of electrical steel
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Foreign References:
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PDF
Publication Date IPC Code Assignee   Title
Buy PDF- 6pp GB2060697 1981-05  C21D 1/78 NIPPON STEEL CORP GRAIN-ORIENTED SILICON STEEL PRODUCTION 


Other Abstract Info: CHEMABS 100(24)196128Y DERABS C84-030413 JAPABS 080150C000148

Other References:
  • A Study on the Occurrence of High Permeability in Grain Oriented Silicon Steel-Hi-B by Takashima et al. Proceedings, No. 29, Magnetism and Magnetic Materials-1975.
  • Effects of Aln on the Secondary Recrystallization Behavior of 3% Si-Fe (110)[001] Single Crystals by Fumio Matsumoto et al. AIP Conference Proceedings, No. 18, Magnetism and Magnetic Materials-1973.


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