EP 4079915 A1 20221026 - COLD ROLLED STEEL SHEET AND PLATED STEEL SHEET WHICH HAVE EXCELLENT BAKE-HARDENABILITY AND ROOM-TEMPERATURE ANTIAGING PROPERTY, AND MANUFACTURING METHODS THEREFOR
Title (en)
COLD ROLLED STEEL SHEET AND PLATED STEEL SHEET WHICH HAVE EXCELLENT BAKE-HARDENABILITY AND ROOM-TEMPERATURE ANTIAGING PROPERTY, AND MANUFACTURING METHODS THEREFOR
Title (de)
KALTGEWALZTES STAHLBLECH UND PLATTIERTES STAHLBLECH MIT AUSGEZEICHNETER RÜCKHÄRTBARKEIT UND ALTERUNGSSCHUTZEIGENSCHAFT BEI RAUMTEMPERATUR SOWIE HERSTELLUNGSVERFAHREN DAFÜR
Title (fr)
TÔLE D'ACIER LAMINÉE À FROID ET TÔLE D'ACIER PLAQUÉE QUI PRÉSENTENT UNE EXCELLENTE APTITUDE AU DURCISSEMENT PAR CUISSON ET UNE EXCELLENTE PROPRIÉTÉ ANTI-VIEILLISSEMENT À TEMPÉRATURE AMBIANTE, ET LEURS PROCÉDÉS DE FABRICATION
Publication
Application
Priority
- KR 20190171888 A 20191220
- KR 2020017650 W 20201204
Abstract (en)
A cold rolled steel sheet having excellent bakehardenability and room-temperature anti-aging property, according to one aspect of the present invention, comprises, by wt%, 0.002-0.015%, of C, 1.5-3.0% of Mn, 0.03% or less of P, 0.01% or less of S, 0.01% or less of N, 0.02-0.06% of sol. Al, 1.2% or less of Cr (excluding 0%), and the balance of Fe and inevitable impurities, comprises, as a microstructure, ferrite, which is a matrix structure, and the balance of hard tissue, and has a hard tissue occupancy ratio (V) that can be 70% or more in grain boundary triple points defined by the following relation 1. [Relation 1] V(%) = {Vtp / (Vgb + Vtp)} × 100 In relation 1, Vgb means the number of hard tissues observed in ferrite grain boundaries within an observation region, and Vtp means the number of hard tissues observed in ferrite grain boundary triple points within the observation region.
IPC 8 full level
C22C 38/38 (2006.01); B21B 1/24 (2006.01); B21B 3/00 (2006.01); C21D 8/02 (2006.01); C21D 8/12 (2006.01)
CPC (source: EP KR US)
B21B 1/24 (2013.01 - KR); B21B 3/00 (2013.01 - KR); C21D 1/26 (2013.01 - EP); C21D 8/0205 (2013.01 - EP US); C21D 8/0226 (2013.01 - EP US); C21D 8/0236 (2013.01 - EP KR US); C21D 8/0247 (2013.01 - EP); C21D 8/0273 (2013.01 - KR); C21D 8/1283 (2013.01 - KR); C21D 9/46 (2013.01 - EP); C22C 38/002 (2013.01 - US); C22C 38/004 (2013.01 - EP); C22C 38/02 (2013.01 - US); C22C 38/04 (2013.01 - EP US); C22C 38/06 (2013.01 - US); C22C 38/18 (2013.01 - US); C22C 38/38 (2013.01 - EP KR); C21D 2211/005 (2013.01 - EP KR US); C21D 2211/008 (2013.01 - KR)
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 4079915 A1 20221026; EP 4079915 A4 20230104; CN 114829664 A 20220729; CN 114829664 B 20240312; JP 2023507724 A 20230227; KR 102326110 B1 20211116; KR 20210079764 A 20210630; US 2023024446 A1 20230126; WO 2021125644 A1 20210624
DOCDB simple family (application)
EP 20903585 A 20201204; CN 202080088901 A 20201204; JP 2022536684 A 20201204; KR 20190171888 A 20191220; KR 2020017650 W 20201204; US 202017787020 A 20201204