Global Patent Index - EP 3178954 A1

EP 3178954 A1 20170614 - COLD-ROLLED STEEL SHEET HAVING EXCELLENT SPOT WELDABILITY, AND MANUFACTURING METHOD THEREFOR

Title (en)

COLD-ROLLED STEEL SHEET HAVING EXCELLENT SPOT WELDABILITY, AND MANUFACTURING METHOD THEREFOR

Title (de)

KALTGEWALZTES STAHLBLECH MIT EXZELLENTER PUNKTSCHWEISSBARKEIT UND HERSTELLUNGSVERFAHREN DAFÜR

Title (fr)

TÔLE EN ACIER LAMINÉE À FROID DOTÉE D'EXCELLENTES PROPRIÉTÉS DE SOUDAGE PAR POINT, ET PROCÉDÉ DE FABRICATION DE CELLE-CI

Publication

EP 3178954 A1 20170614 (EN)

Application

EP 15829208 A 20150731

Priority

  • JP 2014162834 A 20140808
  • JP 2015003881 W 20150731

Abstract (en)

A cold-rolled steel sheet having excellent spot weldability suitable for use in vehicles, electric appliances, etc. is provided. The cold-rolled steel sheet has a steel composition containing, in mass%: C: 0.05% to 0.13%; Si: 0.05% to 2.0%; Mn: 1.5% to 4.0%; P: 0.05% or less; S: 0.005% or less; Al: 0.01% to 0.10%; Cr: 0.05% to 1.0%; Nb: 0.010% to 0.070%; Ti: 0.005% to 0.040%; and N: 0.0005% to 0.0065%, with a mass ratio Ti/N of Ti and N being 2.5 or more and 7.5 or less, and a balance being Fe and incidental impurities, wherein 70 mass% or more ofTi in steel exists as a precipitate, and 15 mass% or more of Nb in the steel exists as solute Nb, and a tensile strength is 980 MPa or more.

IPC 8 full level

C22C 38/00 (2006.01); C21D 9/46 (2006.01); C22C 38/38 (2006.01); C22C 38/58 (2006.01)

CPC (source: EP US)

C21D 1/26 (2013.01 - EP US); C21D 8/0205 (2013.01 - EP US); C21D 8/0226 (2013.01 - EP US); C21D 8/0236 (2013.01 - EP US); C21D 8/0263 (2013.01 - EP US); C21D 9/46 (2013.01 - EP US); C22C 38/00 (2013.01 - EP); C22C 38/001 (2013.01 - EP US); C22C 38/002 (2013.01 - EP US); C22C 38/02 (2013.01 - EP US); C22C 38/06 (2013.01 - EP US); C22C 38/20 (2013.01 - EP US); C22C 38/22 (2013.01 - EP US); C22C 38/24 (2013.01 - EP US); C22C 38/26 (2013.01 - EP US); C22C 38/28 (2013.01 - EP US); C22C 38/38 (2013.01 - EP US); C22C 38/42 (2013.01 - EP US); C22C 38/48 (2013.01 - EP US); C22C 38/50 (2013.01 - EP US); C22C 38/58 (2013.01 - EP US)

Designated contracting state (EPC)

AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

Designated extension state (EPC)

BA ME

DOCDB simple family (publication)

EP 3178954 A1 20170614; EP 3178954 A4 20180110; EP 3178954 B1 20190306; CN 106661693 A 20170510; CN 106661693 B 20180911; JP 2016037650 A 20160322; JP 5935843 B2 20160615; MX 2017001687 A 20170427; US 2017204492 A1 20170720; WO 2016021169 A1 20160211

DOCDB simple family (application)

EP 15829208 A 20150731; CN 201580042291 A 20150731; JP 2014162834 A 20140808; JP 2015003881 W 20150731; MX 2017001687 A 20150731; US 201515329026 A 20150731