Title (en)

Method of producing a grain-oriented electrical steel sheet excellent in magnetic characteristics

Title (de)

Verfahren zur Herstellung eines kornorientierten Elektrobleches mit ausgezeichneten magnetischen Eigenschaften

Title (fr)

Procédé de fabrication d'une tôle d'acier à grains orientés presentant d'excellentes caracteristiques magnétiques

Publication

EP 0947597 A3 20010131 (EN)

Application

EP 99105071 A 19990323

Priority

• JP 8400798 A 19980330
• JP 30750798 A 19981028

Abstract (en)

[origin: EP0947597A2] A method for producing a grain-oriented electrical steel sheet excellent in magnetic characteristics is provided wherein differentiated use of primary and secondary inhibitors enables production without high temperature slab heating, few glass film defects and no lack of uniformity in secondary recrystallization. A slab containing 0.025 SIMILAR 0.10% of C, 2.5 SIMILAR 4.0% of Si as well as acid-soluble Al, Mn, Cu, N, and Seq = (S + 0.406 Se) of 0.008 SIMILAR 0.05% is reheated to a temperature of more than 1050 DEG C and lower than 1350 DEG C and hot-rolled into a hot-rolled strip. The hot-rolled strip is optionally annealed, subjected to at least one cold rolling with intermediate annealing, whereafter the sheet is decarburization annealed to have primary recrystallization grains after completion of the decarburization annealing of an average diameter of not less than 7 mu m and less than 18 mu m, nitrided up to the start of secondary recrystallization, coated with an annealing separator composed mainly of MgO, and subjected to final finish annealing.

IPC 1-7

C22C 38/02; C21D 8/12

IPC 8 full level

C21D 8/12 (2006.01); C22C 38/02 (2006.01); C21D 3/04 (2006.01)

CPC (source: EP KR)

C21D 8/12 (2013.01 - KR); C21D 8/1255 (2013.01 - EP); C22C 38/02 (2013.01 - EP); C21D 3/04 (2013.01 - EP); C21D 8/1227 (2013.01 - EP); C21D 8/1233 (2013.01 - EP); C21D 8/1272 (2013.01 - EP)

Citation (search report)

• [X] EP 0378131 A2 19900718 - NIPPON STEEL CORP [JP]
• [A] EP 0219611 B1 19900516
• [A] US 4623407 A 19861118 - SUGA YOZO [JP], et al & JP S5956522 A 19840402 - NIPPON STEEL CORP
• [A] EP 0339474 A1 19891102 - NIPPON STEEL CORP [JP] & JP H05112827 A 19930507 - NIPPON STEEL CORP
• [A] EP 0743370 A2 19961120 - ARMCO INC [US] & JP H03189964 A 19910819 - MATSUSHITA ELECTRIC IND CO LTD
• [A] DE 4311151 C1 19940728 - THYSSEN STAHL AG [DE] & JP H06322443 A 19941122 - THYSSEN STAHL AG
• [DA] PATENT ABSTRACTS OF JAPAN vol. 014, no. 456 (C - 0765) 2 October 1990 (1990-10-02)

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

DOCDB simple family (publication)

EP 0947597 A2 19991006; EP 0947597 A3 20010131; EP 0947597 B1 20050112; EP 0947597 B2 20150610; DE 69923102 D1 20050217; DE 69923102 T2 20051229; DE 69923102 T3 20151015; KR 19990078406 A 19991025

DOCDB simple family (application)

EP 99105071 A 19990323; DE 69923102 T 19990323; KR 19990011006 A 19990330