EP 4056723 A4 20231018 - HOT ROLLED STEEL SHEET AND PRODUCTION METHOD THEREOF

Title (en)

HOT ROLLED STEEL SHEET AND PRODUCTION METHOD THEREOF

Title (de)

WARMGEWALZTES STAHLBLECH UND HERSTELLUNGSVERFAHREN DAFÜR

Title (fr)

TÔLE D'ACIER LAMINÉE À CHAUD ET PROCÉDÉ DE PRODUCTION CORRESPONDANT

Publication

EP 4056723 A4 20231018 (EN)

Application

EP 20884487 A 20201012

Priority

JP 2019201427 A 20191106
JP 2020038468 W 20201012

Abstract (en)

[origin: EP4056723A1] This hot-rolled steel sheet has a predetermined chemical composition, in which a microstructure contains, by area%, bainite: 80.0% or more, ferrite: 10.0% or less, and a remainder in the microstructure: 10.0% or less, a total density of a length L7 of a grain boundary having a crystal orientation difference of 7° and a length L68 of a grain boundary having a crystal orientation difference of 68° about a <110> direction in the bainite is 0.35 to 0.60 µm/µm2, and a tensile strength is 780 MPa or more.

IPC 8 full level

C21D 8/02 (2006.01); B21B 37/74 (2006.01); C21D 1/19 (2006.01); C21D 9/46 (2006.01); C22C 38/00 (2006.01); C22C 38/28 (2006.01); C22C 38/50 (2006.01); C22C 38/58 (2006.01)

CPC (source: CN EP KR US)

B21B 3/02 (2013.01 - US); B21B 37/74 (2013.01 - CN); C21D 1/19 (2013.01 - EP); C21D 6/001 (2013.01 - US); C21D 6/002 (2013.01 - US); C21D 6/005 (2013.01 - US); C21D 6/007 (2013.01 - US); C21D 6/008 (2013.01 - US); C21D 8/0205 (2013.01 - CN); C21D 8/021 (2013.01 - EP); C21D 8/0226 (2013.01 - CN EP KR); C21D 8/0247 (2013.01 - KR); C21D 9/46 (2013.01 - EP KR US); C22C 38/001 (2013.01 - US); C22C 38/002 (2013.01 - CN US); C22C 38/005 (2013.01 - CN US); C22C 38/02 (2013.01 - CN EP US); C22C 38/04 (2013.01 - CN EP); C22C 38/06 (2013.01 - CN EP US); C22C 38/08 (2013.01 - US); C22C 38/14 (2013.01 - EP); C22C 38/16 (2013.01 - US); C22C 38/22 (2013.01 - US); C22C 38/24 (2013.01 - US); C22C 38/26 (2013.01 - US); C22C 38/28 (2013.01 - EP US); C22C 38/32 (2013.01 - US); C22C 38/34 (2013.01 - CN); C22C 38/38 (2013.01 - US); C22C 38/42 (2013.01 - CN KR); C22C 38/44 (2013.01 - CN KR); C22C 38/46 (2013.01 - CN KR); C22C 38/48 (2013.01 - CN KR); C22C 38/50 (2013.01 - CN EP KR); C22C 38/52 (2013.01 - CN); C22C 38/54 (2013.01 - CN KR); C22C 38/58 (2013.01 - CN KR); C21D 1/02 (2013.01 - EP); C21D 2211/002 (2013.01 - CN EP KR US); C21D 2211/005 (2013.01 - CN KR US); C22C 38/002 (2013.01 - EP); C22C 38/005 (2013.01 - EP); C22C 38/08 (2013.01 - EP); C22C 38/12 (2013.01 - EP); C22C 38/16 (2013.01 - EP); C22C 38/22 (2013.01 - EP); C22C 38/24 (2013.01 - EP); C22C 38/26 (2013.01 - EP); C22C 38/32 (2013.01 - EP); C22C 38/38 (2013.01 - EP)

Citation (search report)

[A] WO 2013150687 A1 20131010 - NIPPON STEEL & SUMITOMO METAL CORP [JP]
[A] EP 2812455 A1 20141217 - ASCOMETAL SA [FR], et al
See also references of WO 2021090642A1

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

DOCDB simple family (publication)

EP 4056723 A1 20220914; EP 4056723 A4 20231018; CN 114630917 A 20220614; CN 114630917 B 20231024; JP 7243854 B2 20230322; JP WO2021090642 A1 20210514; KR 102715430 B1 20241011; KR 20220068250 A 20220525; MX 2022004885 A 20220516; US 2022259692 A1 20220818; WO 2021090642 A1 20210514

DOCDB simple family (application)

EP 20884487 A 20201012; CN 202080074990 A 20201012; JP 2020038468 W 20201012; JP 2021554855 A 20201012; KR 20227013559 A 20201012; MX 2022004885 A 20201012; US 202017765697 A 20201012