EP 4324944 A1 20240221 - HEAT-TREATED STEEL MATERIAL AND HEAT TREATMENT METHOD FOR STEEL MATERIAL
Title (en)
HEAT-TREATED STEEL MATERIAL AND HEAT TREATMENT METHOD FOR STEEL MATERIAL
Title (de)
WÄRMEBEHANDELTES STAHLMATERIAL UND WÄRMEBEHANDLUNGSVERFAHREN FÜR STAHLMATERIAL
Title (fr)
MATÉRIAU EN ACIER TRAITÉ THERMIQUEMENT ET PROCÉDÉ DE TRAITEMENT THERMIQUE POUR MATÉRIAU EN ACIER
Publication
Application
Priority
- JP 2021069177 A 20210415
- JP 2022017584 W 20220412
Abstract (en)
To provide a heat-treated steel excellent in both tensile strength and toughness.A heat-treated steel contains 0.38 to 1.05% by mass of C, 0.0 to 1.0% by mass of Mn, 0.0 to 0.50% by mass of Cr, and 0.0 to 1.5% by mass of Si with the remainder being Fe and unavoidable impurities, wherein an average crystal grain size at a grain boundary setting angle of 15° is 10 × C + 7(µm) or less (wherein, C represents a carbon content (%)).
IPC 8 full level
C21D 9/52 (2006.01); C21D 1/40 (2006.01); C21D 1/42 (2006.01); C21D 1/48 (2006.01); C22C 38/00 (2006.01); C22C 38/18 (2006.01)
CPC (source: EP KR)
C21D 1/20 (2013.01 - EP); C21D 1/40 (2013.01 - EP KR); C21D 1/42 (2013.01 - KR); C21D 1/48 (2013.01 - EP KR); C21D 8/065 (2013.01 - EP KR); C21D 9/525 (2013.01 - KR); C21D 9/5732 (2013.01 - EP); C21D 9/62 (2013.01 - EP); C21D 9/64 (2013.01 - EP); C22C 38/02 (2013.01 - EP); C22C 38/04 (2013.01 - EP); C22C 38/18 (2013.01 - EP KR); C21D 2201/05 (2013.01 - EP); C21D 2211/009 (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
Designated extension state (EPC)
BA ME
Designated validation state (EPC)
KH MA MD TN
DOCDB simple family (publication)
EP 4324944 A1 20240221; CN 117120654 A 20231124; JP WO2022220238 A1 20221020; KR 20230170753 A 20231219; WO 2022220238 A1 20221020
DOCDB simple family (application)
EP 22788163 A 20220412; CN 202280028481 A 20220412; JP 2022017584 W 20220412; JP 2023514654 A 20220412; KR 20237039208 A 20220412