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)

C21D 8/0436 (2013.01); C21D 8/0468 (2013.01)

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