EP 4286544 A1 20231206 - STEEL SHEET FOR HOT STAMPING AND HOT STAMPING MOLDED BODY
Title (en)
STEEL SHEET FOR HOT STAMPING AND HOT STAMPING MOLDED BODY
Title (de)
STAHLBLECH FÜR HEISSPRÄGUNG UND HEISSPRÄGUNG EINES FORMKÖRPERS
Title (fr)
TÔLE D'ACIER POUR ESTAMPAGE À CHAUD, ET CORPS MOULÉ PAR ESTAMPAGE À CHAUD
Publication
Application
Priority
- JP 2021081620 A 20210513
- JP 2022019656 W 20220509
Abstract (en)
This steel sheet for hot stamping has a predetermined chemical composition and has a microstructure in which S<sub>α</sub> + S<sub>GB</sub>, which is a total of an area ratio S<sub>α</sub> of ferrite and an area ratio S<sub>GB</sub> of a granular bainite, is 10% or more and less than 50% and S<sub>GB</sub>/S<sub>α</sub>, which is a ratio between the area ratio S<sub>GB</sub> of the granular bainite and the area ratio S<sub>α</sub> of the ferrite, is 0.30 to 0.70. In addition, a hot-stamping formed body manufactured using this steel sheet for hot stamping has a predetermined chemical composition and a microstructure in which an average grain size of prior austenite grains is 5 to 25 µm, and a standard deviation of grain sizes of the prior austenite grains is 0.1 to 2.0 µm, and a tensile strength of the hot-stamping formed body is 2,200 MPa or more.
IPC 8 full level
C21D 9/00 (2006.01); C21D 1/18 (2006.01); C21D 9/46 (2006.01); C22C 38/00 (2006.01); C22C 38/60 (2006.01)
CPC (source: EP KR US)
C21D 1/02 (2013.01 - EP); C21D 1/18 (2013.01 - EP KR); C21D 1/673 (2013.01 - EP); C21D 7/13 (2013.01 - EP); C21D 8/0205 (2013.01 - EP); C21D 8/0226 (2013.01 - EP); C21D 9/46 (2013.01 - EP KR US); C22C 38/001 (2013.01 - KR); C22C 38/005 (2013.01 - EP); C22C 38/008 (2013.01 - EP KR); C22C 38/02 (2013.01 - EP US); C22C 38/04 (2013.01 - EP); C22C 38/06 (2013.01 - EP US); C22C 38/22 (2013.01 - EP); C22C 38/26 (2013.01 - EP); C22C 38/28 (2013.01 - EP); C22C 38/30 (2013.01 - EP); C22C 38/32 (2013.01 - EP); C22C 38/38 (2013.01 - EP US); C22C 38/42 (2013.01 - KR); C22C 38/44 (2013.01 - KR); C22C 38/46 (2013.01 - KR); C22C 38/48 (2013.01 - EP KR); C22C 38/50 (2013.01 - EP KR); C22C 38/52 (2013.01 - KR); C22C 38/54 (2013.01 - EP KR); C22C 38/58 (2013.01 - EP KR); C22C 38/60 (2013.01 - EP); C21D 2211/001 (2013.01 - KR US); C21D 2211/002 (2013.01 - EP KR US); C21D 2211/005 (2013.01 - EP KR 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 4286544 A1 20231206; CN 116917524 A 20231020; JP WO2022239731 A1 20221117; KR 20230137436 A 20231004; MX 2023010146 A 20230911; US 2024183015 A1 20240606; WO 2022239731 A1 20221117
DOCDB simple family (application)
EP 22807432 A 20220509; CN 202280018830 A 20220509; JP 2022019656 W 20220509; JP 2023521010 A 20220509; KR 20237029584 A 20220509; MX 2023010146 A 20220509; US 202218279370 A 20220509