Global Patent Index - EP 1070148 A1

EP 1070148 A1 2001-01-24 - METHOD FOR MAKING A HOT-ROLLED STEEL STRIP FOR SWAGING

Title (en)

METHOD FOR MAKING A HOT-ROLLED STEEL STRIP FOR SWAGING

Title (de)

VERFAHREN ZUM HERSTELLEN EINES WARMGEWALZTEN STAHLBLECHES ZUM TIEFZIEHEN

Title (fr)

PROCEDE DE FABRICATION D'UNE BANDE D'ACIER LAMINEE A CHAUD POUR EMBOUTISSAGE

Publication

EP 1070148 A1 (FR)

Application

EP 00900991 A

Priority

  • BE 0000007 W
  • BE 9900078 A

Abstract (en)

[origin: WO0046411A1] The invention concerns a method for making a hot-rolled steel strip for swaging which consists in: subjecting a steel slab at temperature higher than Ac3 to a rough-rolling in the austenitic phase and subsequently to a finish-rolling, applied to steel of the Ti-IF type containing at least 0.05 wt. % of titanium and 0.015 wt. % of niobium; performing the finish-rolling partially in the low temperature region of the steel austenitic phase, without lubricating the rolls and at a thickness reduction rate ranging between 30 % and 80 %, and partially in the steel ferritic phase, with lubricated rolls and at an initial ferritic rolling temperature ranging between 860 DEG C and 800 DEG C and a final ferritic rolling temperature ranging between 750 DEG C and 600 DEG C; then winding the strip at a temperature ranging between 650 DEG C and 500 DEG C and continuously annealing it at a temperature ranging between 800 DEG C and 850 DEG C for a time interval between 30 seconds and 2 minutes. The lubricating of the rolls during the steel ferritic phase rolling is performed with an ester-based oil. The steel austenitic phase is rough-rolled and the steel is subjected to accelerated cooling down to a temperature not less than the initial finish-rolling temperature.

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

C21D 8/04

IPC 8 full level (invention and additional information)

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

CPC (invention and additional information)

C21D 8/0426 (2013.01); C22C 38/12 (2013.01); C21D 8/0431 (2013.01)

Citation (search report)

See references of WO 0046411A1

Designated contracting state (EPC)

BE DE ES FR GB LU NL

EPO simple patent family

WO 0046411 A1 20000810; AU 2086900 A 20000825; BE 1012462 A3 20001107; DE 60028875 D1 20060803; DE 60028875 T2 20061130; EP 1070148 A1 20010124; EP 1070148 B1 20060621; ES 2265908 T3 20070301

INPADOC legal status


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2013-06-27 [REG DE R100] EPO DECISION MAINTAINING PATENT UNAMENDED NOW FINAL

- Document: DE 60028875

- Effective date: 20130207

2013-05-01 [27O] OPPOSITION REJECTED

- Effective date: 20130207

2010-11-24 [R26] OPPOSITION FILED (CORRECTION)

- Opponent name: THYSSENKRUPP STEEL EUROPE AG

- Effective date: 20070321

2007-07-02 [NLR1] NL: OPPOSITION HAS BEEN FILED WITH THE EPO

- Opponent name: THYSSENKRUPP STEEL AG

2007-04-25 [26] OPPOSITION FILED

- Opponent name: THYSSENKRUPP STEEL AG

- Effective date: 20070321

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- Document: ES 2265908 T3

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- Document: DE 60028875 P 20060803

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- Owner name: CENTRE DE RECHERCHES METALLURGIQUES - CENTRUM VOOR

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