Global Patent Index - EP 2627790 B1

EP 2627790 B1 20141008 - METHOD OF HOT FORMING A STEEL BLANK AND THE HOT FORMED PART

Title (en)

METHOD OF HOT FORMING A STEEL BLANK AND THE HOT FORMED PART

Title (de)

METHODE ZUM HEISSUMFORMEN EINES STAHL BELCHES UND DAS HEISS UMGEFORMTE TEIL

Title (fr)

METHODE POUR DEFORMATION A CHAUD D' UNE TOLE D'ACIER ET TOLE D'ACIER

Publication

EP 2627790 B1 20141008 (EN)

Application

EP 11772882 A 20111010

Priority

  • EP 10013537 A 20101012
  • EP 2011005053 W 20111010
  • EP 11772882 A 20111010

Abstract (en)

[origin: WO2012048841A1] According to a first aspect the present invention provides a method of hot forming a steel blank into an article the method comprising the following steps: d) cooling a heated steel blank to form an article during hot forming, starting at a starting temperature T2 above Ar3; to an interrupt temperature T3 in the range of 400 - 550 °C at a cooling rate V2 of at least 25 °C/s; e) immediately further cooling the article from the interrupt temperature T3 to ambient temperature at a cooling rate V3 of 0.2 - 10 °C/s, wherein the interrupt temperature T3 and cooling rate V3 are selected such that the article thus obtained has multiphase microstructure comprising by volume fraction: 55 - 90% of bainitic ferrite 5 - 15% of retained austenite 5 - 30% martensite.

IPC 8 full level

C21D 8/00 (2006.01); C21D 1/673 (2006.01); C21D 8/02 (2006.01); C21D 9/46 (2006.01); C21D 9/48 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/12 (2006.01); C22C 38/14 (2006.01); C22C 38/22 (2006.01); C22C 38/28 (2006.01); C22C 38/38 (2006.01)

CPC (source: EP US)

C21D 1/673 (2013.01 - EP); C21D 8/005 (2013.01 - US); C21D 9/48 (2013.01 - EP); C22C 38/02 (2013.01 - EP US); C22C 38/04 (2013.01 - EP US); C22C 38/12 (2013.01 - US); C22C 38/14 (2013.01 - EP US); C22C 38/22 (2013.01 - US); C22C 38/28 (2013.01 - US); C22C 38/38 (2013.01 - US); C21D 8/0226 (2013.01 - EP); C21D 8/0236 (2013.01 - EP); C21D 9/46 (2013.01 - EP); C21D 2211/001 (2013.01 - EP); C21D 2211/002 (2013.01 - EP); C21D 2211/008 (2013.01 - EP)

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

DOCDB simple family (publication)

WO 2012048841 A1 20120419; WO 2012048841 A8 20130425; CN 103154279 A 20130612; CN 103154279 B 20150923; EP 2627790 A1 20130821; EP 2627790 B1 20141008; JP 2013545890 A 20131226; US 2013192726 A1 20130801

DOCDB simple family (application)

EP 2011005053 W 20111010; CN 201180048067 A 20111010; EP 11772882 A 20111010; JP 2013533121 A 20111010; US 201113819281 A 20111010