EP 3216889 B1 20181212 - HIGH-CARBON COLD-ROLLED STEEL SHEET AND METHOD FOR MANUFACTURING SAME
Title (en)
HIGH-CARBON COLD-ROLLED STEEL SHEET AND METHOD FOR MANUFACTURING SAME
Title (de)
HOCHGEKOHLTES KALTGEWALZTES STAHLBLECH UND VERFAHREN ZU DESSEN HERSTELLUNG
Title (fr)
TÔLE D'ACIER À HAUTE TENEUR EN CARBONE LAMINÉE À FROID ET SON PROCÉDÉ DE FABRICATION
Publication
Application
Priority
- JP 2015160015 A 20150814
- JP 2016076330 A 20160406
- JP 2016071133 W 20160719
Abstract (en)
[origin: EP3216889A1] Provided is a high-carbon cold-rolled steel sheet having a thickness of less than 1.0 mm and capable of having good impact and hardness characteristics after a short solution treatment, and thereafter quenching and low-temperature tempering. A high-carbon cold-rolled steel sheet having a steel sheet chemical composition containing, in terms of mass%, C: 0.85-1.10%, Mn: 0.50-1.0%, Si: 0.10-0.35%, P: 0.030% or less, S: 0.030% or less, and Cr: 0.35-0.45%, and furthermore containing Nb: 0.005-0.020 mass% with the remainder being Fe and unavoidable impurities, having a steel sheet structure in which the average particle diameter (d av ) of carbide dispersed in the steel sheet is 0.2-0.7 (µm) and the spheroidization ratio is 90% or higher, and having a thickness of less than 1.0 mm. Mechanical characteristics having an excellent impact characteristic in which the impact value is 5 j/cm 2 or higher and a sufficient hardness characteristic within the range of 600-750 HV can thereby be manifested by a short solution treatment of 3-15 minutes, and thereafter quenching and low-temperature tempering.
IPC 8 full level
C21D 1/18 (2006.01); C21D 1/32 (2006.01); C21D 6/00 (2006.01); C21D 8/02 (2006.01); C21D 8/12 (2006.01); C21D 9/46 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/18 (2006.01); C22C 38/22 (2006.01); C22C 38/24 (2006.01); C22C 38/26 (2006.01); C21D 9/26 (2006.01)
CPC (source: EP KR)
C21D 1/32 (2013.01 - EP KR); C21D 8/0226 (2013.01 - EP); C21D 8/0236 (2013.01 - EP KR); C21D 8/0247 (2013.01 - EP); C21D 8/0268 (2013.01 - EP); C21D 9/46 (2013.01 - KR); C22C 38/00 (2013.01 - EP); C22C 38/02 (2013.01 - EP); C22C 38/04 (2013.01 - EP); C22C 38/18 (2013.01 - EP); C22C 38/22 (2013.01 - EP); C22C 38/24 (2013.01 - EP); C22C 38/26 (2013.01 - EP KR); C21D 1/18 (2013.01 - EP); C21D 9/46 (2013.01 - EP); C21D 2211/004 (2013.01 - EP); C21D 2211/008 (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
DOCDB simple family (publication)
EP 3216889 A1 20170913; EP 3216889 A4 20171025; EP 3216889 B1 20181212; CN 107208224 A 20170926; CN 107208224 B 20181109; JP 2017036492 A 20170216; JP 6089131 B2 20170301; KR 101953495 B1 20190228; KR 20170075783 A 20170703; TW 201712130 A 20170401; TW I591187 B 20170711; WO 2017029922 A1 20170223
DOCDB simple family (application)
EP 16836913 A 20160719; CN 201680008133 A 20160719; JP 2016071133 W 20160719; JP 2016076330 A 20160406; KR 20177014614 A 20160719; TW 105125451 A 20160810