EP 4296383 A4 20231227 - NITRIDING METHOD FOR STEEL MEMBER
Title (en)
NITRIDING METHOD FOR STEEL MEMBER
Title (de)
NITRIERVERFAHREN FÜR STAHLELEMENT
Title (fr)
PROCÉDÉ DE NITRURATION POUR ÉLÉMENT EN ACIER
Publication
Application
Priority
- JP 2021023129 A 20210217
- JP 2022006065 W 20220216
Abstract (en)
[origin: WO2022176878A1] A nitriding method for a steel member that has at least two nitriding steps. The nitriding method for a steel member has: a first nitriding step in which a steel member is nitrided in a nitriding gas atmosphere that has a first nitriding potential; and a second nitriding step in which, after the first nitriding step, the steel member is further nitrided in a nitriding gas atmosphere that has a second nitriding potential that is lower than the first nitriding potential. The first nitriding step and the second nitriding step are performed at a temperature of 500°C–590°C, the first nitriding potential is a value within the range of 0.300–10.000, and the second nitriding potential is a value within the range of 0.253–0.600.
IPC 8 full level
C21D 9/32 (2006.01); C21D 1/06 (2006.01); C23C 8/02 (2006.01); C23C 8/26 (2006.01); C23C 8/80 (2006.01)
CPC (source: EP KR US)
C21D 1/06 (2013.01 - EP KR); C21D 8/0257 (2013.01 - US); C21D 9/32 (2013.01 - EP KR); C23C 8/02 (2013.01 - EP); C23C 8/26 (2013.01 - EP KR); C23C 8/80 (2013.01 - EP); C23C 8/34 (2013.01 - KR)
Citation (search report)
- [XI] WO 2019208534 A1 20191031 - PARKER NETSUSHORI KOGYO CO LTD [JP]
- [XA] JP 2020164994 A 20201008 - DOWA THERMOTECH KK
- [XA] US 2019177829 A1 20190613 - SHIMIZU KATSUSHIGE [JP], et al
- [XA] US 2017138326 A1 20170518 - PAULUS CHRISTIAN [DE], et al
- [XA] KR 101830221 B1 20180221 - DONGWOO HST CO LTD [KR]
- [A] JP 2017160517 A 20170914 - PARKER NETSU SHORI KOGYO KK
- See also references of WO 2022176878A1
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 4296383 A1 20231227; EP 4296383 A4 20231227; CN 116917529 A 20231020; JP 2022125513 A 20220829; KR 20230145118 A 20231017; MX 2023009143 A 20230817; TW 202237866 A 20221001; TW I809714 B 20230721; US 2024132985 A1 20240425; WO 2022176878 A1 20220825
DOCDB simple family (application)
EP 22756196 A 20220216; CN 202280014939 A 20220216; JP 2021023129 A 20210217; JP 2022006065 W 20220216; KR 20237030522 A 20220216; MX 2023009143 A 20220216; TW 111105406 A 20220215; US 202218546438 A 20220216