Title:
PROCESS FOR PRODUCING GRAIN-ORIENTED ELECTROMAGNETIC STEEL SHEET WITH EXCELLENT CORE LOSS CHARACTERISTICS
Document Type and Number:
WIPO Patent Application WO/2013/039193
Kind Code:
A1
Abstract:
A process for producing a grain-oriented electromagnetic steel sheet, the process comprising hot-rolling a steel slab that contains, in terms of mass%, 0.001-0.10% C, 1.0-5.0% Si, 0.01-0.5% Mn, 0.003-0.050% sol. Al, 0.0010-0.020% N, and 0.005-0.040% S and/or Se, cold-rolling the hot-rolled steel, and subjecting the cold-rolled steel to primary recrystallization annealing and then to finish annealing, wherein in the heating in the primary recrystallization annealing, the rate of heating (S1) from T1 (ºC), 500+2×(NB-NA), to T2 (ºC), 600+2×(NB-NA), is regulated to 80 ºC/sec or higher and the average rate of heating (S2) from the temperature T2 to 750ºC is regulated to 0.1-0.7 times the S1. Thus, a grain-oriented electromagnetic steel sheet which gives a product coil having reduced core loss throughout the whole length is obtained. In the expressions, NA is the amount of precipitated N present after the cold rolling and NB is the amount of precipitated N present after the primary recrystallization annealing.
Inventors:
SHINGAKI YUKIHIRO (JP)
WATANABE MAKOTO (JP)
SENDA KUNIHIRO (JP)
WATANABE MAKOTO (JP)
SENDA KUNIHIRO (JP)
Application Number:
PCT/JP2012/073608
Publication Date:
March 21, 2013
Filing Date:
September 14, 2012
Export Citation:
Assignee:
JFE STEEL CORP (JP)
SHINGAKI YUKIHIRO (JP)
WATANABE MAKOTO (JP)
SENDA KUNIHIRO (JP)
SHINGAKI YUKIHIRO (JP)
WATANABE MAKOTO (JP)
SENDA KUNIHIRO (JP)
International Classes:
C21D8/12; C22C38/00; C22C38/60; H01F1/16
Foreign References:
| JP2008001977A | 2008-01-10 | |||
| JPH0762436A | 1995-03-07 | |||
| JP2000144249A | 2000-05-26 | |||
| JP2000355717A | 2000-12-26 | |||
| JP2012207278A | 2012-10-25 | |||
| JPH0762436A | 1995-03-07 | |||
| JPH10298653A | 1998-11-10 | |||
| JP2003027194A | 2003-01-29 | |||
| JP2000204450A | 2000-07-25 | |||
| JPS5079442A | 1975-06-27 | |||
| JPS4839338A | 1973-06-09 |
Other References:
See also references of EP 2757165A4
Attorney, Agent or Firm:
GINZA MARONIE P. C. (JP)
Patent business corporation Ginza horse chestnut patent firm (JP)
Patent business corporation Ginza horse chestnut patent firm (JP)
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Claims: