Global Patent Index - EP 0747495 B1

EP 0747495 B1 2000-01-19 - Niobium containing hot rolled steel sheet with high strength and good deep-drawing properties, and process for its manufacture

Title (en)

Niobium containing hot rolled steel sheet with high strength and good deep-drawing properties, and process for its manufacture

Title (de)

Niob enthaltendes warmgewalztes, hochfestes Stahlblech mit gute Tiefziehfähigkeit, und Verfahren zu ihrer Herstellung

Title (fr)

Tôle d'acier laminée à chaud à haute résistance et haute emboutissabilité refermant du niobium, et ses procédés de fabrication

Publication

EP 0747495 B1 (FR)

Application

EP 96401007 A

Priority

FR 9506746 A

Abstract (en)

[origin: EP0747495A1] Steel sheet comprises 0.5-1.5wt.% Mn, 0.01-0.10, pref. 0.010-0.020% Nb, 0.01-0.1% Al and up to 0.12% C, 0.3% Si, 0.1% P, 0.05% S, 1% Cr, also up to 0.05% of Ti not in the form of nitrides, sulphides or oxides. The structure comprises at least 75% of ferrite hardened by precipitation of carbides or carbonitrides of Nb or of Nb and Ti, the remainder comprising at least 10% martensite and possibly bainite and austenite. Also claimed are methods of making the steel sheet by hot-rolling followed by controlled cooling.

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

C22C 38/12; C21D 8/04

IPC 8 full level (invention and additional information)

C21D 8/02 (2006.01); C21D 8/04 (2006.01); C22C 38/00 (2006.01); C22C 38/12 (2006.01); C22C 38/28 (2006.01)

CPC (invention and additional information)

C21D 8/0426 (2013.01); C22C 38/12 (2013.01); C21D 8/0463 (2013.01); C21D 2211/004 (2013.01); C21D 2211/005 (2013.01); C21D 2211/008 (2013.01)

Designated contracting state (EPC)

AT BE DE ES FI FR GB IT LU NL SE

DOCDB simple family

EP 0747495 A1 19961211; EP 0747495 B1 20000119; AT 189007 T 20000215; BR 9602713 A 19980422; CA 2178306 A1 19961209; DE 69606226 D1 20000224; DE 69606226 T2 20000907; ES 2143726 T3 20000516; FR 2735148 A1 19961213; FR 2735148 B1 19970711; JP H093609 A 19970107; US 5817196 A 19981006