EP 3680359 A4 20200715 - HOT-PRESSED STEEL SHEET MEMBER AND METHOD FOR PRODUCING SAME
Title (en)
HOT-PRESSED STEEL SHEET MEMBER AND METHOD FOR PRODUCING SAME
Title (de)
HEISSGEWALZTES STAHLBLECH UND VERFAHREN ZUR HERSTELLUNG DAVON
Title (fr)
ÉLÉMENT EN TÔLE D'ACIER PRESSÉE À CHAUD ET SON PROCÉDÉ DE PRODUCTION
Publication
Application
Priority
- JP 2017218301 A 20171113
- JP 2018041343 W 20181107
Abstract (en)
[origin: EP3680359A1] Disclosed is a hot-pressed steel sheet member having a tensile strength of 1780 MPa or more and excellent bending collapsibility. The hot-pressed steel sheet member has: a chemical composition containing, in mass%, C: 0.30 % or more and less than 0.50 %, Si: 0.01 % or more and 2.0 % or less, Mn: 0.5 % or more and 3.5 % or less, Nb: 0.001 % or more and 0.10 % or less, P: 0.05 % or less, S: 0.01 % or less, Al: 0.01 % or more and 1.00 % or less, and N: 0.01 % or less, with the balance being Fe and inevitable impurities, where a ratio of a C content in mass% to a Nb content in mass%, C/Nb, is from 22 to 100; a microstructure in which an average grain size of prior austenite grains is 8 µm or less, a volume fraction of martensite is 90 % or more, and a solute C content is 25 % or less of a total C content; and a tensile strength of 1780 MPa or more.
IPC 8 full level
C22C 38/00 (2006.01); C21D 1/18 (2006.01); C21D 6/00 (2006.01); C21D 9/00 (2006.01); C21D 9/46 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/12 (2006.01); C22C 38/58 (2006.01); C23C 2/06 (2006.01)
CPC (source: EP KR US)
C21D 1/18 (2013.01 - EP KR); C21D 6/005 (2013.01 - EP KR); C21D 6/008 (2013.01 - EP KR); C21D 8/0226 (2013.01 - KR); C21D 8/0236 (2013.01 - KR US); C21D 9/46 (2013.01 - EP KR US); C22C 38/001 (2013.01 - EP KR US); C22C 38/008 (2013.01 - US); C22C 38/02 (2013.01 - EP KR US); C22C 38/04 (2013.01 - EP KR US); C22C 38/06 (2013.01 - KR US); C22C 38/105 (2013.01 - US); C22C 38/12 (2013.01 - EP KR US); C22C 38/14 (2013.01 - US); C22C 38/16 (2013.01 - US); C22C 38/32 (2013.01 - US); C23C 2/06 (2013.01 - EP KR US); C23C 2/12 (2013.01 - EP KR US); C23C 2/28 (2013.01 - EP KR US); C23C 2/29 (2022.08 - EP US); C23C 2/40 (2013.01 - EP KR); C23C 30/00 (2013.01 - EP KR); C21D 2211/001 (2013.01 - KR US); C21D 2211/004 (2013.01 - EP KR); C21D 2211/008 (2013.01 - EP KR US)
Citation (search report)
- [X] JP 2014118613 A 20140630 - NIPPON STEEL & SUMITOMO METAL CORP
- [I] WO 2017111456 A1 20170629 - POSCO [KR] & EP 3395994 A1 20181031 - POSCO [KR]
- [A] JP 2007211276 A 20070823 - SUMITOMO METAL IND
- See also references of WO 2019093376A1
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 3680359 A1 20200715; EP 3680359 A4 20200715; EP 3680359 B1 20220105; CN 111344425 A 20200626; CN 111344425 B 20210921; JP 6569841 B1 20190904; JP WO2019093376 A1 20191114; KR 20200066350 A 20200609; MX 2020004926 A 20200827; US 2020332382 A1 20201022; WO 2019093376 A1 20190516
DOCDB simple family (application)
EP 18876175 A 20181107; CN 201880072876 A 20181107; JP 2018041343 W 20181107; JP 2019512936 A 20181107; KR 20207013700 A 20181107; MX 2020004926 A 20181107; US 201816754135 A 20181107