EP 3647451 A4 20201104 - STEEL MATERIAL HAVING EXCELLENT ROLLING FATIGUE CHARACTERISTICS
Title (en)
STEEL MATERIAL HAVING EXCELLENT ROLLING FATIGUE CHARACTERISTICS
Title (de)
STAHLMATERIAL MIT HERVORRAGENDEN WALZERMÜDUNGSEIGENSCHAFTEN
Title (fr)
MATÉRIAU EN ACIER DOTÉ D'EXCELLENTES CARACTÉRISTIQUES DE FATIGUE DE ROULEMENT
Publication
Application
Priority
- JP 2017176163 A 20170913
- JP 2017176165 A 20170913
- JP 2017176161 A 20170913
- JP 2018034008 W 20180913
Abstract (en)
[origin: EP3647451A1] A steel material excellent in rolling fatigue property, the steel material including, in mass%: C: 0.10% to 1.50%, Si: 0.01% to 0.80%, Mn: 0.10% to 1.50%, Cr: 0.02% to 2.50%, Al: 0.002% to less than 0.010%, Ce + La + Nd: 0.0001% to 0.0025%, Mg: 0.0005% to 0.0050%, O: 0.0001% to 0.0020%, Ti: 0.000% to less than 0.005%, N: 0.0180% or less, P: 0.030% or less, S: 0.005% or less, Ca: 0.0000% to 0.0010%, V: 0.00 to 0.40%, Mo: 0.00 to 0.60%, Cu: 0.00 to 0.50%, Nb: 0.000 to less than 0.050%, Ni: 0.00 to 2.50%, Pb: 0.00 to 0.10%, Bi: 0.00 to 0.10%, B: 0.0000 to 0.0050%, and the balance being Fe and an impurity, wherein a fatigue-initiating inclusion detected by an ultrasonic fatigue test contains one or more of Ce, La, and Nd, and Mg, Al, and O, and a composition ratio in the fatigue-initiating inclusion satisfies Formula (1).
IPC 8 full level
C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/18 (2006.01); C22C 38/20 (2006.01); C22C 38/22 (2006.01); C22C 38/24 (2006.01); C22C 38/26 (2006.01); C22C 38/28 (2006.01); C22C 38/32 (2006.01); C22C 38/40 (2006.01); C22C 38/60 (2006.01); C21C 7/06 (2006.01); C21D 9/40 (2006.01)
CPC (source: EP KR US)
C21C 7/06 (2013.01 - KR); C22C 38/001 (2013.01 - EP KR US); C22C 38/002 (2013.01 - EP US); C22C 38/005 (2013.01 - EP US); C22C 38/02 (2013.01 - EP US); C22C 38/04 (2013.01 - EP US); C22C 38/06 (2013.01 - EP US); C22C 38/08 (2013.01 - US); C22C 38/18 (2013.01 - EP); C22C 38/20 (2013.01 - EP US); C22C 38/22 (2013.01 - EP US); C22C 38/24 (2013.01 - EP US); C22C 38/26 (2013.01 - EP US); C22C 38/28 (2013.01 - EP US); C22C 38/32 (2013.01 - EP US); C22C 38/40 (2013.01 - EP); C22C 38/42 (2013.01 - KR); C22C 38/44 (2013.01 - KR); C22C 38/50 (2013.01 - KR); C22C 38/60 (2013.01 - EP KR US); C21C 7/06 (2013.01 - EP US); C21D 1/42 (2013.01 - US); C21D 6/002 (2013.01 - US); C21D 6/005 (2013.01 - US); C21D 6/008 (2013.01 - US); C21D 9/40 (2013.01 - EP)
Citation (search report)
- [A] EP 3072987 A1 20160928 - NIPPON STEEL & SUMITOMO METAL CORP [JP]
- [A] JP 2005002420 A 20050106 - NIPPON STEEL CORP
- [A] EP 0829546 A1 19980318 - KAWASAKI STEEL CO [JP]
- [A] US 2015191808 A1 20150709 - HASHIMURA MASAYUKI [JP], et al
- See references of WO 2019054448A1
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 3647451 A1 20200506; EP 3647451 A4 20201104; CN 111065755 A 20200424; JP 6652226 B2 20200219; JP WO2019054448 A1 20200326; KR 20200044866 A 20200429; US 2020216937 A1 20200709; WO 2019054448 A1 20190321
DOCDB simple family (application)
EP 18857159 A 20180913; CN 201880057744 A 20180913; JP 2018034008 W 20180913; JP 2019542288 A 20180913; KR 20207008332 A 20180913; US 201816642700 A 20180913