EP 4263882 A1 20231025 - COATED STEEL SHEET AND HIGH STRENGTH PRESS HARDENED STEEL PART AND METHOD OF MANUFACTURING THE SAME
Title (en)
COATED STEEL SHEET AND HIGH STRENGTH PRESS HARDENED STEEL PART AND METHOD OF MANUFACTURING THE SAME
Title (de)
BESCHICHTETES STAHLBLECH UND HOCHFESTES PRESSGEHÄRTETES STAHLTEIL UND HERSTELLUNGSVERFAHREN DAFÜR
Title (fr)
TÔLE D'ACIER REVÊTUE, PIÈCE EN ACIER TREMPÉ SOUS PRESSE À HAUTE RÉSISTANCE ET LEUR PROCÉDÉ DE FABRICATION
Publication
Application
Priority
- IB 2020062045 W 20201216
- IB 2021061291 W 20211203
Abstract (en)
[origin: WO2022129995A1] The invention deals with a coated steel sheet and press hardened steel part having a composition comprising, by weight percent: C 0.26-0.40%, Mn 0.5-1.8%, Si 0.1-1.25%, Al 0.01 -0.1%, Cr 0.1 -1.0%, Ti 0.01 -0.1%, B 0.001 -0.004%, P ≤ 0.020%, S ≤ 0.010%, N ≤ 0.010% the remainder of the composition being iron and unavoidable impurities resulting from the smelting. The press hardened steel part comprises a bulk having a microstructure comprising, in surface fraction, more than 95% of martensite and less than 5% of bainite, a coating layer at the surface of the steel part, a ferritic interdiffusion layer between the coating layer and the bulk, and a ratio between the ferritic grain width in the interdiffusion layer GWint over prior austenite grain size in the bulk PAGSbulk, satisfying following equation (GWint / PAGSbulk)-1 ≥ 30%.
IPC 8 full level
C21D 1/673 (2006.01); C21D 6/00 (2006.01); C21D 8/02 (2006.01); C21D 9/40 (2006.01); C21D 9/46 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/12 (2006.01); C22C 38/38 (2006.01); C23C 2/02 (2006.01); C23C 2/12 (2006.01); C23C 2/26 (2006.01); C23C 2/28 (2006.01); C23C 2/40 (2006.01)
CPC (source: EP KR US)
B21C 47/02 (2013.01 - KR US); C21D 1/673 (2013.01 - EP KR); C21D 6/00 (2013.01 - EP KR); C21D 8/02 (2013.01 - EP); C21D 8/0205 (2013.01 - US); C21D 8/0226 (2013.01 - KR US); C21D 8/0236 (2013.01 - KR); C21D 8/0273 (2013.01 - US); C21D 8/0278 (2013.01 - US); C21D 8/0436 (2013.01 - US); C21D 9/40 (2013.01 - EP); C21D 9/46 (2013.01 - EP KR); C22C 38/001 (2013.01 - KR); C22C 38/02 (2013.01 - EP US); C22C 38/04 (2013.01 - EP); C22C 38/06 (2013.01 - US); C22C 38/12 (2013.01 - EP); C22C 38/28 (2013.01 - KR US); C22C 38/32 (2013.01 - KR US); C22C 38/38 (2013.01 - EP KR US); C22C 38/58 (2013.01 - KR); C23C 2/02 (2013.01 - EP KR US); C23C 2/0224 (2022.08 - EP US); C23C 2/024 (2022.08 - EP US); C23C 2/12 (2013.01 - EP KR US); C23C 2/26 (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 US); C23G 1/08 (2013.01 - KR); C21D 2211/002 (2013.01 - US); C21D 2211/005 (2013.01 - US); C21D 2211/008 (2013.01 - 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
Designated validation state (EPC)
KH MA MD TN
DOCDB simple family (publication)
WO 2022129995 A1 20220623; BR 112023008984 A2 20240206; CA 3200721 A1 20220623; CN 116568828 A 20230808; EP 4263882 A1 20231025; JP 2023553672 A 20231225; KR 20230100737 A 20230705; MX 2023007039 A 20230623; US 2024102138 A1 20240328; WO 2022130101 A1 20220623
DOCDB simple family (application)
IB 2020062045 W 20201216; BR 112023008984 A 20211203; CA 3200721 A 20211203; CN 202180082401 A 20211203; EP 21819985 A 20211203; IB 2021061291 W 20211203; JP 2023536409 A 20211203; KR 20237018582 A 20211203; MX 2023007039 A 20211203; US 202118266682 A 20211203