EP 4116003 A1 20230111 - METHOD FOR MANUFACTURING STEEL COMPONENT HAVING LOCALLY SOFTENED SECTION
Title (en)
METHOD FOR MANUFACTURING STEEL COMPONENT HAVING LOCALLY SOFTENED SECTION
Title (de)
VERFAHREN ZUR HERSTELLUNG EINER STAHLKOMPONENTE MIT LOKAL WEICHGEMACHTEM ABSCHNITT
Title (fr)
PROCÉDÉ DE FABRICATION D'ÉLÉMENT EN ACIER DOTÉ DE SECTION RAMOLLIE LOCALEMENT
Publication
Application
Priority
- JP 2020042274 A 20200311
- JP 2020172764 A 20201013
- JP 2021001266 W 20210115
Abstract (en)
Disclosed is a method for producing a steel component, which include the steps of: preparing a steel sheet having a chemical composition including: C: 0.05 to 0.40% by mass, Si: 0 to 2.0% by mass, Mn: 1.0 to 3.0% by mass, Al: 0.010 to 1.0% by mass, P: more than 0% by mass and 0.100% by mass or less, S: more than 0% by mass and 0.010% by mass or less, N: more than 0% by mass and 0.010% by mass or less, and B: 0.0005 to 0.010% by mass, with the balance being iron and inevitable impurities; heating the steel sheet to a temperature of Ac1 point (°C) or higher and lower than Ac3 point (°C) + 10°C; after the heating step, processing the steel sheet by applying a strain of 0.5% or more thereto at a temperature of 675°C or higher and lower than Ac3 point + 10°C; after the processing step, holding or gradually cooling the steel sheet at an average cooling rate of 0 to 15°C/sec for 1 second or more and 120 seconds or less; and after the holding or gradually cooling step, cooling the steel sheet to a temperature of Ms point (°C) - 50°C, wherein an average cooling rate from the temperature of the heating step to the Ms point (°C) - 50°C is controlled to be 10°C/sec or more.
IPC 8 full level
B21D 22/20 (2006.01); B21D 22/26 (2006.01); B21J 1/02 (2006.01); B21J 5/00 (2006.01); C21D 1/18 (2006.01); C21D 8/00 (2006.01); C22C 38/00 (2006.01); C22C 38/06 (2006.01); C22C 38/38 (2006.01); C22C 38/58 (2006.01)
CPC (source: EP KR US)
B21D 22/26 (2013.01 - KR); B21J 1/02 (2013.01 - KR); B21J 5/00 (2013.01 - KR); C21D 1/18 (2013.01 - KR); C21D 1/19 (2013.01 - EP); C21D 1/84 (2013.01 - KR US); C21D 6/002 (2013.01 - US); C21D 6/005 (2013.01 - US); C21D 8/0205 (2013.01 - EP US); C21D 8/0247 (2013.01 - KR); C21D 8/0252 (2013.01 - EP US); C21D 9/46 (2013.01 - EP US); C22C 38/001 (2013.01 - KR US); C22C 38/002 (2013.01 - EP US); C22C 38/02 (2013.01 - EP KR); C22C 38/04 (2013.01 - EP KR US); C22C 38/06 (2013.01 - EP KR US); C22C 38/08 (2013.01 - KR); C22C 38/20 (2013.01 - EP US); C22C 38/28 (2013.01 - EP US); C22C 38/32 (2013.01 - EP US); C22C 38/34 (2013.01 - EP KR); C22C 38/38 (2013.01 - EP KR); C21D 2211/001 (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)
EP 4116003 A1 20230111; EP 4116003 A4 20230621; BR 112022016203 A2 20221004; CA 3169085 A1 20210916; CA 3169085 C 20240416; CN 115279927 A 20221101; CN 115279927 B 20241025; KR 20220145896 A 20221031; MX 2022011132 A 20221013; US 2023138493 A1 20230504; WO 2021181866 A1 20210916
DOCDB simple family (application)
EP 21768018 A 20210115; BR 112022016203 A 20210115; CA 3169085 A 20210115; CN 202180019095 A 20210115; JP 2021001266 W 20210115; KR 20227033512 A 20210115; MX 2022011132 A 20210115; US 202117905221 A 20210115