Global Patent Index - EP 0704542 B9

EP 0704542 B9 2002-12-18 - Method for making non-oriented magnetic steel sheet

Title (en)

Method for making non-oriented magnetic steel sheet

Title (de)

Verfahren zum Herstellen einer nichtkornorientierter magnetischer Stahlblecher

Title (fr)

Procédé pour la fabrication de tôles d'acier magnétique non-orienté

Publication

EP 0704542 B9 (EN)

Application

EP 95115236 A

Priority

JP 23541994 A

Abstract (en)

[origin: EP0704542A1] This invention is directed to a method of producing a non-oriented magnetic steel sheet involving a series of processes including performing hot rolling process on a steel slab containing no more than about 0.01 wt% C, no more than about 4.0 wt% Si, no more than about 1.5 wt% Mn, no more than about 1.5 wt% Al, no more than about 0.2 wt% P, and no more than about 0.01 wt% S, performing thereto at least one cold rolling process including an optional intermediate annealing process, and then performing a finishing annealing process. The hot rolling process further includes a step which reduces thermal irregularity formed during slab heating; this step involves maintaining a sheet bar, obtained by rough-rolling of the steel slab, at a temperature ranging from about 850 DEG to 1,150 DEG C. The hot rolling process also includes a step which promotes the growth of fine precipitated particles by applying strain to the sheet bar. Magnetic steel sheet thusly obtained possess uniform magnetic properties and thickness in the coil. <IMAGE>

IPC 1-7 (main, further and additional classification)

C21D 8/12

IPC 8 full level (invention and additional information)

B21B 3/02 (2006.01); B21C 47/26 (2006.01); C21D 8/12 (2006.01); C22C 38/00 (2006.01); C21D 9/68 (2006.01)

CPC (invention and additional information)

C21D 8/1222 (2013.01); C21D 8/1233 (2013.01); C21D 8/125 (2013.01); C21D 9/68 (2013.01)

Designated contracting state (EPC)

DE FR GB

EPO simple patent family

EP 0704542 A1 19960403; EP 0704542 B1 20010718; EP 0704542 B9 20021218; CN 1057342 C 20001011; CN 1133891 A 19961023; DE 69521757 D1 20010823; DE 69521757 T2 20011031; JP 3333794 B2 20021015; JP H0892643 A 19960409; KR 100266550 B1 20000915; TW 297052 B 19970201; US 5637157 A 19970610

INPADOC legal status


2009-11-30 [PG25 GB] LAPSED IN A CONTRACTING STATE ANNOUNCED VIA POSTGRANT INFORM. FROM NAT. OFFICE TO EPO

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- Free text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

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2009-10-30 [PG25 FR] LAPSED IN A CONTRACTING STATE ANNOUNCED VIA POSTGRANT INFORM. FROM NAT. OFFICE TO EPO

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- Free text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

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2009-08-31 [PG25 DE] LAPSED IN A CONTRACTING STATE ANNOUNCED VIA POSTGRANT INFORM. FROM NAT. OFFICE TO EPO

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- Free text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

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2009-07-03 [REG FR ST] NOTIFICATION OF LAPSE

- Effective date: 20090529

2009-05-27 [GBPC] GB: EUROPEAN PATENT CEASED THROUGH NON-PAYMENT OF RENEWAL FEE

- Effective date: 20080927

2008-04-30 [PGFP FR] POSTGRANT: ANNUAL FEES PAID TO NATIONAL OFFICE

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2008-01-02 [PGFP GB] POSTGRANT: ANNUAL FEES PAID TO NATIONAL OFFICE

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2007-09-20 [PGFP DE] POSTGRANT: ANNUAL FEES PAID TO NATIONAL OFFICE

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2002-07-10 [26N] NO OPPOSITION FILED

2002-01-01 [REG GB IF02] EUROPEAN PATENT IN FORCE AS OF 2002-01-01

2001-12-07 [ET] FR: TRANSLATION FILED

2001-08-23 [REF] CORRESPONDS TO:

- Document: DE 69521757 20010823

2001-07-18 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: B1

- Designated State(s): DE FR GB

1999-08-25 [17Q] FIRST EXAMINATION REPORT

- Effective date: 19990708

1996-06-12 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 19960412

1996-04-03 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): DE FR GB