EP 3272896 A1 20180124 - AGE-HARDENABLE STEEL, AND METHOD FOR MANUFACTURING COMPONENTS USING AGE-HARDENABLE STEEL
Title (en)
AGE-HARDENABLE STEEL, AND METHOD FOR MANUFACTURING COMPONENTS USING AGE-HARDENABLE STEEL
Title (de)
AUSHÄRTBARER STAHL UND VERFAHREN ZUR HERSTELLUNG VON KOMPONENTEN MIT AUSHÄRTBAREM STAHL
Title (fr)
ACIER DURCISSABLE PAR VIEILLISSEMENT, ET PROCÉDÉ DE FABRICATION DE COMPOSANTS AU MOYEN DE L'ACIER DURCISSABLE PAR VIEILLISSEMENT
Publication
Application
Priority
- JP 2015052557 A 20150316
- JP 2016058391 W 20160316
Abstract (en)
Age hardenable steel is low in hardness after hot forging, providing a machine part with the desired fatigue strength and yield strength by aging treatment, and high in toughness after aging treatment, comprising C: 0.09 to 0.20%, Si: 0.01 to 0.40%, Mn: 1.5 to 2.5%, S: 0.001 to 0.045%, Cr: over 1.00% to 2.00%, Al: 0.001 to 0.060%, V: 0.22 to 0.55%, N: over 0.0080 to 0.0170%, and a balance of Fe and impurities, where an area rate of bainite structures is 80% or more, an effective V ratio (amount of dissolved V/total amount of V) is 0.9 or more, a P and Ti in the impurities is P: 0.03% or less and Ti: less than 0.005%, and the chemical composition is one where the following F1 is 1.00 or less and the F2 is 0.30 or more: F 1 = C + 0.1 × Si + 0.2 × Mn + 0.15 × Cr + 0.35 × V F 2 = ˆ’ 4.5 × C + Mn + Cr ˆ’ 3.5 × V
IPC 8 full level
C22C 38/00 (2006.01); C21D 8/00 (2006.01); C21D 9/00 (2006.01); C22C 38/60 (2006.01)
CPC (source: EP US)
C21D 1/18 (2013.01 - EP US); C21D 6/004 (2013.01 - EP US); C21D 6/005 (2013.01 - EP US); C21D 6/008 (2013.01 - EP US); C21D 6/02 (2013.01 - EP US); C21D 8/005 (2013.01 - EP US); C21D 8/065 (2013.01 - EP US); C21D 9/0068 (2013.01 - EP US); C21D 9/525 (2013.01 - EP US); C22C 38/001 (2013.01 - EP US); C22C 38/002 (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 38/20 (2013.01 - EP US); C22C 38/22 (2013.01 - EP US); C22C 38/24 (2013.01 - EP US); C22C 38/38 (2013.01 - EP US); C22C 38/42 (2013.01 - EP US); C22C 38/44 (2013.01 - EP US); C22C 38/46 (2013.01 - EP US); C22C 38/48 (2013.01 - EP US); C22C 38/50 (2013.01 - EP US); C22C 38/58 (2013.01 - EP US); C21D 2211/002 (2013.01 - EP US)
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 3272896 A1 20180124; EP 3272896 A4 20181010; EP 3272896 B1 20200108; ES 2769257 T3 20200625; JP 6465959 B2 20190206; JP WO2016148206 A1 20180118; US 2018245172 A1 20180830; WO 2016148206 A1 20160922
DOCDB simple family (application)
EP 16765035 A 20160316; ES 16765035 T 20160316; JP 2016058391 W 20160316; JP 2017506592 A 20160316; US 201615558963 A 20160316