EP 3109330 A1 20161228 - METHOD FOR PRODUCING HIGH-STRENGTH STEEL PLATE
Title (en)
METHOD FOR PRODUCING HIGH-STRENGTH STEEL PLATE
Title (de)
VERFAHREN ZUR HERSTELLUNG VON HOCHFESTEM STAHLBLECH
Title (fr)
PROCÉDÉ DE PRODUCTION DE TÔLE D'ACIER À HAUTE RÉSISTANCE
Publication
Application
Priority
- JP 2014028030 A 20140218
- JP 2015000460 W 20150203
Abstract (en)
Provided are a high-strength steel sheet that has excellent chemical conversion treatability and corrosion resistance after electrodeposition coating even when the content of Si or Mn is high and a method for manufacturing the high-strength steel sheet. When a steel sheet containing, by mass%, 0.03% to 0.35% C, 0.01% to 0.50% Si, 3.6% to 8.0% Mn, 0.01% to 1.0% Al, 0.10% or less P, and 0.010% or less S, the remainder being Fe and inevitable impurities is continuously annealed, the steel sheet is heated at a heating rate of 7 °C/s or more in a temperature range corresponding to an annealing furnace inside temperature of 450°C to A°C (where 500 ‰¤ A ‰¤ 600), the maximum end-point temperature of the steel sheet in an annealing furnace is 600°C to 700°C, the transit time of the steel sheet in a temperature range corresponding to a steel sheet temperature of 600°C to 700°C is 30 seconds to 10 minutes, and the concentration of hydrogen in an atmosphere is 20% by volume or more in a heating step.
IPC 8 full level
C21D 9/46 (2006.01); C21D 1/76 (2006.01); C22C 38/00 (2006.01); C22C 38/06 (2006.01); C22C 38/58 (2006.01)
CPC (source: EP KR US)
C21D 1/26 (2013.01 - EP KR US); C21D 1/76 (2013.01 - EP KR US); C21D 6/004 (2013.01 - EP US); C21D 6/005 (2013.01 - EP US); C21D 6/008 (2013.01 - EP US); C21D 8/0473 (2013.01 - EP KR US); C21D 9/46 (2013.01 - EP KR US); C22C 38/00 (2013.01 - EP US); C22C 38/002 (2013.01 - EP US); C22C 38/008 (2013.01 - EP US); C22C 38/02 (2013.01 - EP KR US); C22C 38/04 (2013.01 - EP KR US); C22C 38/06 (2013.01 - EP KR US); C22C 38/08 (2013.01 - EP US); C22C 38/12 (2013.01 - EP US); C22C 38/14 (2013.01 - EP US); C22C 38/16 (2013.01 - EP US); C22C 38/38 (2013.01 - EP US); C22C 38/58 (2013.01 - KR); C22C 38/60 (2013.01 - EP US); C25F 1/06 (2013.01 - EP US); C21D 9/561 (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 3109330 A1 20161228; EP 3109330 A4 20170322; EP 3109330 B1 20180822; CN 106029919 A 20161012; JP 2015151595 A 20150824; JP 6032221 B2 20161124; KR 20160122813 A 20161024; MX 2016010669 A 20161108; US 2017067131 A1 20170309; WO 2015125422 A1 20150827
DOCDB simple family (application)
EP 15751393 A 20150203; CN 201580008846 A 20150203; JP 2014028030 A 20140218; JP 2015000460 W 20150203; KR 20167025406 A 20150203; MX 2016010669 A 20150203; US 201515119778 A 20150203