EP 3848477 A1 20210714 - HIGH-CARBON COLD-ROLLED STEEL SHEET AND PRODUCTION METHOD THEREFOR, AND MECHANICAL PARTS MADE OF HIGH-CARBON STEEL
Title (en)
HIGH-CARBON COLD-ROLLED STEEL SHEET AND PRODUCTION METHOD THEREFOR, AND MECHANICAL PARTS MADE OF HIGH-CARBON STEEL
Title (de)
KALTGEWALZTES STAHLBLECH MIT HOHEM KOHLENSTOFFGEHALT, VERFAHREN ZU SEINER HERSTELLUNG UND MASCHINENTEILE AUS STAHL MIT HOHEM KOHLENSTOFFGEHALT
Title (fr)
TÔLE D'ACIER LAMINÉE À FROID À HAUTE TENEUR EN CARBONE ET SON PROCÉDÉ DE PRODUCTION, ET PIÈCES MÉCANIQUES EN ACIER À HAUTE TENEUR EN CARBONE
Publication
Application
Priority
JP 2019043828 W 20191108
Abstract (en)
Provided is a high carbon cold rolled steel sheet which can have good impact characteristics and hardness characteristics and excellent wear resistance after rapid cooling (quenching) treatment after short-time solution treatment and low-temperature tempering treatment (quenching and tempering treatment), has little decrease in secondary workability before the quenching and tempering treatment, and has a sheet thickness of less than 1.0 mm.The high carbon cold rolled steel sheet has a steel sheet chemical composition consisting of, by mass%, C: 0.85% to 1.10%, Mn: less than 0.60%, Si: 0.10% to 0.35%, P: 0.030% or less, S: 0.030% or less, Cr: less than 0.60%, Mn + Cr satisfying less than 1.0%, Nb: 0.005% to 0.020%, and the balance being Fe and inevitable impurities. Thereby, compared with conventional steel materials, there is little decrease in the secondary workability before quenching and tempering. In addition, by adopting a steel sheet structure with an average particle diameter of carbide of 0.2 to 0.7 (µm) and a spheroidization rate of 90% or more, even with a quenching and tempering treatment in such a short time as 3 to 15 min, it is possible to provide a machine part having excellent impact characteristics with an impact value of 9 J/cm<sup>2</sup>, sufficient hardness characteristics in a range of 600 to 750 HV, and excellent wear resistance.
IPC 8 full level
C21D 9/46 (2006.01); C22C 38/00 (2006.01); C22C 38/26 (2006.01)
CPC (source: EP KR)
C21D 1/18 (2013.01 - EP); C21D 1/25 (2013.01 - EP); C21D 1/26 (2013.01 - EP); C21D 1/32 (2013.01 - EP); C21D 1/58 (2013.01 - EP); C21D 8/0205 (2013.01 - EP); C21D 8/0236 (2013.01 - KR); C21D 8/0268 (2013.01 - EP); C21D 8/0273 (2013.01 - KR); C21D 9/26 (2013.01 - EP); C21D 9/46 (2013.01 - EP); C22C 38/02 (2013.01 - EP); C22C 38/04 (2013.01 - EP); C22C 38/12 (2013.01 - EP); C22C 38/22 (2013.01 - EP KR); C22C 38/24 (2013.01 - EP KR); C22C 38/26 (2013.01 - EP KR); C21D 2211/004 (2013.01 - EP); C21D 2211/008 (2013.01 - EP); C21D 2261/00 (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
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
EP 3848477 A1 20210714; EP 3848477 A4 20220525; CN 113099723 A 20210709; CN 113099723 B 20230217; JP 6880245 B1 20210602; JP WO2021090472 A1 20211125; KR 102329386 B1 20211119; KR 20210056880 A 20210520; TW 202118881 A 20210516; TW I734291 B 20210721; WO 2021090472 A1 20210514
DOCDB simple family (application)
EP 19817932 A 20191108; CN 201980003091 A 20191108; JP 2019043828 W 20191108; JP 2019567743 A 20191108; KR 20197036612 A 20191108; TW 108144683 A 20191206