Global Patent Index - EP 0754770 B1

EP 0754770 B1 20011114 - Method of producing a thin steel strip having improved deep-drawing properties

Title (en)

Method of producing a thin steel strip having improved deep-drawing properties

Title (de)

Verfahren zum Herstellen eines dünnen Blechbandes mit verbesserter Tiefziehbarkeit

Title (fr)

Procédé de fabrication d'une bande de tôle mince à emboutissabilité améliorée

Publication

EP 0754770 B1 20011114 (FR)

Application

EP 96401347 A 19960620

Priority

FR 9508643 A 19950718

Abstract (en)

[origin: EP0754770A1] A ductile steel band is made from an alloy containing the following proportions of elements indicated in thousandths of percent by weight: 0-20, pref. 2-20 of C, 0-500, pref. 100-500 Si, 0-1000 Mn, 0-100, pref. 50-100 P, 0-50 S, 0-100 Al, 0-10, pref. 2-8 N and one or more of 0-150 Ti, 0-150, pref. 10-50 Nb and 0-5, pref. 0-2 B, the remainder being Fe. The alloy is first hot-rolled, then cold-rolled to reduce its thickness by over 20%, annealed at up to 920 degrees C, cold rolled again, also reducing the thickness by over 20% while impressing a degree of rugosity on the surface, and finally annealed at above recrystallisation temp. A thin steel band made the process is also claimed.

IPC 1-7

C21D 8/04

IPC 8 full level

B21B 3/00 (2006.01); C21D 8/04 (2006.01); C21D 9/46 (2006.01); C22C 38/00 (2006.01); C22C 38/14 (2006.01)

CPC (source: EP KR)

B21B 1/22 (2013.01 - KR); C21D 8/0436 (2013.01 - EP KR); C21D 8/0468 (2013.01 - KR); C22C 38/001 (2013.01 - KR); C22C 38/02 (2013.01 - KR); C22C 38/04 (2013.01 - KR); C22C 38/06 (2013.01 - KR); C22C 38/12 (2013.01 - KR); C22C 38/14 (2013.01 - KR); B21B 2001/221 (2013.01 - KR); C21D 8/0468 (2013.01 - EP)

Designated contracting state (EPC)

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

DOCDB simple family (publication)

EP 0754770 A1 19970122; EP 0754770 B1 20011114; AT 208831 T 20011115; DE 69616887 D1 20011220; DE 69616887 T2 20020529; DK 0754770 T3 20020225; ES 2164222 T3 20020216; FR 2736933 A1 19970124; FR 2736933 B1 19970822; JP H0931539 A 19970204; KR 970005422 A 19970219; PT 754770 E 20020531

DOCDB simple family (application)

EP 96401347 A 19960620; AT 96401347 T 19960620; DE 69616887 T 19960620; DK 96401347 T 19960620; ES 96401347 T 19960620; FR 9508643 A 19950718; JP 20656496 A 19960717; KR 19960028752 A 19960716; PT 96401347 T 19960620