EP 1857563 A1 20071121 - NON-TEMPERED STEEL SOFT NITRIDED COMPONENT
Title (en)
NON-TEMPERED STEEL SOFT NITRIDED COMPONENT
Title (de)
WEICHNITRIERTES BAUTEIL AUS UNVERGÜTETEM STAHL
Title (fr)
COMPOSANT NITRURE SOUPLE EN ACIER NON TREMPE
Publication
Application
Priority
- JP 2006302433 W 20060213
- JP 2005051775 A 20050225
Abstract (en)
Soft-nitrided parts wherein a ferrite grain in the diffusion layer does not have a ³' nitride of more than 20µm in the longitudinal axis, which is made of a non-heat treated steel that has a chemical composition of, by mass %, C:0.30 to 0.45%, Si:0.1 to 0.5%, Mn:0.6 to 1.0%, Ti:0.005 to 0.1%, N:0.010 to 0.030%, and the balance Fe and impurities, and that has a mixed microstructure of bainite and ferrite whose bainite fraction is 5 to 90% or a mixed microstructure of bainite, ferrite and pearlite whose bainite fraction is 5 to 90%. The non-heat treated steel may contain one or more elements of 0.001 to 0.1% of Nb, 0.01 to 1.0% of Mo:, 0.01 to 1.0% of Cu, 0.01 to 1.0% of Ni and 0.001 to 0.005%of B, 0.01 to 0.1°/of S and 0.0001 to 0.005% of Ca. This invention provides machinery parts, based on this non-heat treated steel for soft-nitriding, which has further improved high fatigue strength and excellent bending straightening property after soft-nitrided even omitting thermal refining.
IPC 8 full level
C22C 38/00 (2006.01); C21D 9/30 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/08 (2006.01); C22C 38/12 (2006.01); C22C 38/14 (2006.01); C22C 38/16 (2006.01); C22C 38/22 (2006.01); C22C 38/24 (2006.01); C22C 38/60 (2006.01); C23C 8/26 (2006.01); C23C 24/04 (2006.01)
CPC (source: EP US)
C21D 9/30 (2013.01 - EP US); C22C 38/001 (2013.01 - EP US); C22C 38/02 (2013.01 - EP US); C22C 38/04 (2013.01 - EP US); C22C 38/08 (2013.01 - EP US); C22C 38/12 (2013.01 - EP US); C22C 38/14 (2013.01 - EP US); C22C 38/16 (2013.01 - EP US); C22C 38/22 (2013.01 - EP US); C22C 38/24 (2013.01 - EP US); C22C 38/60 (2013.01 - EP US); C23C 8/26 (2013.01 - EP US)
Designated contracting state (EPC)
DE GB
DOCDB simple family (publication)
EP 1857563 A1 20071121; EP 1857563 A4 20100804; EP 1857563 A8 20080423; EP 1857563 B1 20140101; CN 100545289 C 20090930; CN 101128611 A 20080220; JP 2006233300 A 20060907; JP 4500708 B2 20100714; US 2008000553 A1 20080103; WO 2006090604 A1 20060831
DOCDB simple family (application)
EP 06713575 A 20060213; CN 200680005930 A 20060213; JP 2005051775 A 20050225; JP 2006302433 W 20060213; US 89257907 A 20070824