EP 4174191 A1 20230503 - RAIL HAVING EXCELLENT FATIGUE CRACK PROPAGATION RESISTANCE CHARACTERISTICS, AND METHOD FOR PRODUCING SAME
Title (en)
RAIL HAVING EXCELLENT FATIGUE CRACK PROPAGATION RESISTANCE CHARACTERISTICS, AND METHOD FOR PRODUCING SAME
Title (de)
SCHIENE MIT HERVORRAGENDEN ERMÜDUNGSRISSAUSBREITUNGSBESTÄNDIGKEITSEIGENSCHAFTEN UND VERFAHREN ZUR HERSTELLUNG DAVON
Title (fr)
RAIL PRÉSENTANT D'EXCELLENTES CARACTÉRISTIQUES DE RÉSISTANCE À LA PROPAGATION DE FISSURES PAR FATIGUE, ET SON PROCÉDÉ DE PRODUCTION
Publication
Application
Priority
- JP 2020111354 A 20200629
- JP 2021020871 W 20210601
Abstract (en)
Proposed is a rail having excellent fatigue damage resistance, particularly excellent fatigue crack propagation resistance characteristics and a preferable method for producing the same. The rail has a component composition comprising, on a mass basis, C: 0.80 to 1.30%, Si: 0.10 to1.20%, Mn: 0.20 to 1.80%, P≦0.035%, S: 0.0005 to 0.012%, Cr: 0.20 to 2.50%and the remainder being Fe and inevitable impurities and has CP = X/R<sub>A</sub> of not more than 2500 (where X = {(10 × [%C]) + ([%Si]/12) + ([%Mn]/24) + ([%Cr]/ 21)}<sup>5</sup>, and [%Y] is a content of an element Y (mass%), and R<sub>A</sub> is a prior austenite grain size (µm)). In the production method of the rail, a raw steel material is heated to not higher than 1350°C and then hot-rolled such that a finish temperature is not lower than 900°C.
IPC 8 full level
C21D 8/00 (2006.01); C22C 38/00 (2006.01); C22C 38/38 (2006.01); C22C 38/60 (2006.01)
CPC (source: EP KR US)
C21D 1/02 (2013.01 - EP); C21D 7/13 (2013.01 - EP); C21D 8/0205 (2013.01 - US); C21D 8/0226 (2013.01 - KR US); C21D 9/04 (2013.01 - EP KR US); C22C 38/02 (2013.01 - EP US); C22C 38/04 (2013.01 - EP); C22C 38/06 (2013.01 - KR); C22C 38/18 (2013.01 - EP); C22C 38/20 (2013.01 - EP); C22C 38/22 (2013.01 - EP); C22C 38/24 (2013.01 - EP); C22C 38/26 (2013.01 - EP); C22C 38/28 (2013.01 - EP); C22C 38/32 (2013.01 - EP); C22C 38/38 (2013.01 - EP KR US); C22C 38/40 (2013.01 - EP); C22C 38/44 (2013.01 - KR); C22C 38/46 (2013.01 - KR); C22C 38/48 (2013.01 - KR); C22C 38/50 (2013.01 - KR); C22C 38/58 (2013.01 - KR); C22C 38/60 (2013.01 - EP)
Citation (search report)
See references of WO 2022004247A1
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 4174191 A1 20230503; AU 2021302317 A1 20230119; AU 2021302317 B2 20231116; BR 112022025557 A2 20230131; CA 3186612 A1 20220106; CN 115917019 A 20230404; JP 7173366 B2 20221116; JP WO2022004247 A1 20220106; KR 20220160695 A 20221206; US 2023279517 A1 20230907; WO 2022004247 A1 20220106
DOCDB simple family (application)
EP 21834151 A 20210601; AU 2021302317 A 20210601; BR 112022025557 A 20210601; CA 3186612 A 20210601; CN 202180044681 A 20210601; JP 2021020871 W 20210601; JP 2021545917 A 20210601; KR 20227038956 A 20210601; US 202118008203 A 20210601