EP 4153791 A4 20240410 - METHOD FOR PROCESSING ADVANCED HIGH STRENGTH STEEL
Title (en)
METHOD FOR PROCESSING ADVANCED HIGH STRENGTH STEEL
Title (de)
VERFAHREN ZUR VERARBEITUNG VON FORTSCHRITTLICHEM HOCHFESTEM STAHL
Title (fr)
PROCÉDÉ POUR LE TRAITEMENT D'UN ACIER À HAUTE RÉSISTANCE AVANCÉ
Publication
Application
Priority
- US 202063026230 P 20200518
- US 2021032936 W 20210518
Abstract (en)
[origin: WO2021236619A1] A method of manufacturing an energy absorbing component for a vehicle is provided. The method includes heating a bainitic GENS steel material which has a microstructure including ferrite and bainite to a temperature above the Ac3 temperature to convert a portion of the ferrite and bainite to austenite. The method further includes forming while cooling the heated steel blank into a component in a temperature controlled steel die. During the cooling step, the steel material is cooled to a temperature below the Ms temperature to form retained austenite. A portion of the austenite transforms to martensite and bainite during the forming and cooling step. The method can further include heating the component to a temperature above the Ms temperature after the forming and cooling step to increase energy absorption characteristics. During a crash event, the strain imposed on the component converts retained austenite present in the component to martensite.
IPC 8 full level
C22C 38/04 (2006.01); B21D 22/02 (2006.01); C21D 1/25 (2006.01); C21D 1/673 (2006.01); C21D 6/00 (2006.01); C21D 6/02 (2006.01); C21D 7/13 (2006.01); C21D 9/48 (2006.01); C22C 38/02 (2006.01); C22C 38/06 (2006.01); C22C 38/16 (2006.01); C22C 38/18 (2006.01); C22C 38/20 (2006.01); C22C 38/34 (2006.01); C22C 38/38 (2006.01); C22C 38/58 (2006.01)
CPC (source: EP US)
C21D 1/25 (2013.01 - EP); C21D 1/673 (2013.01 - EP); C21D 6/002 (2013.01 - EP); C21D 7/13 (2013.01 - EP); C21D 8/005 (2013.01 - US); C21D 9/0068 (2013.01 - US); C21D 9/48 (2013.01 - EP); C22C 38/02 (2013.01 - EP); C22C 38/04 (2013.01 - EP); C22C 38/06 (2013.01 - EP); C22C 38/20 (2013.01 - EP); C22C 38/34 (2013.01 - EP US); C22C 38/38 (2013.01 - EP US); C22C 38/58 (2013.01 - EP); C21D 2211/001 (2013.01 - EP US); C21D 2211/002 (2013.01 - EP US); C21D 2211/005 (2013.01 - EP US); C21D 2211/008 (2013.01 - EP US)
Citation (search report)
- [XI] US 2020131597 A1 20200430 - TAKASHIMA KATSUTOSHI [JP], et al
- [I] CN 1865481 A 20061122 - SHANGHAI MEISHAN CO LTD BAOSTE [CN]
- [A] H. KARBASIAN ET AL: "A review on hot stamping", JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, vol. 210, no. 15, 1 November 2010 (2010-11-01), pages 2103 - 2118, XP055141086, ISSN: 0924-0136, DOI: 10.1016/j.jmatprotec.2010.07.019
- See also references of WO 2021236619A1
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 2021236619 A1 20211125; CA 3177824 A1 20211125; CN 115667568 A 20230131; EP 4153791 A1 20230329; EP 4153791 A4 20240410; US 2023183828 A1 20230615
DOCDB simple family (application)
US 2021032936 W 20210518; CA 3177824 A 20210518; CN 202180036106 A 20210518; EP 21809887 A 20210518; US 202117925902 A 20210518