EP 2976436 A1 20160127 - BAINITIC MICROALLOY STEEL WITH ENHANCED NITRIDING CHARACTERISTICS
Title (en)
BAINITIC MICROALLOY STEEL WITH ENHANCED NITRIDING CHARACTERISTICS
Title (de)
BAINITISCHER MIKROLEGIERUNGSSTAHL MIT VERBESSERTEN NITRIERUNGSEIGENSCHAFTEN
Title (fr)
ACIER DE MICRO-ALLIAGE BAINITIQUE AYANT DES CARACTÉRISTIQUES DE NITRURATION AMÉLIORÉES
Publication
Application
Priority
- US 201313848812 A 20130322
- US 2014031398 W 20140321
Abstract (en)
[origin: US2014283954A1] A forged, microalloyed, and nitrided steel part is disclosed to have a composition including 0.20-0.40 wt. % C, 0.50-1.60 wt. % Mn, 0.40-1.50 wt. % Cr, 0.07-0.30 wt. % Al, 0.03-0.20 wt. % V, 0.10-0.40 wt. % Si, and a balance of Fe and incidental impurities. The part may be produced by heating the steel part to austenization temperature of approximately 1100 degrees C. to 1260 degrees C., hot forging the steel part, controlled air cooling the steel part after hot forging at a rate falling approximately in the range from 1 degree C. per second to 5 degrees C. per second as the steel part cools from approximately 900 degrees C. to approximately 500 degrees C. to produce a predominantly bainitic microstructure of greater than approximately 50% bainite. The steel part may then be machined to a desired configuration, and nitrided by heating in an atmosphere containing ammonia.
IPC 8 full level
C21D 1/02 (2006.01); C22C 38/06 (2006.01); C22C 38/24 (2006.01); C22C 38/38 (2006.01)
CPC (source: EP US)
C21D 1/20 (2013.01 - EP US); C21D 7/13 (2013.01 - EP US); C22C 38/06 (2013.01 - EP US); C22C 38/24 (2013.01 - EP US); C22C 38/38 (2013.01 - EP US); C23C 8/02 (2013.01 - EP US); C23C 8/26 (2013.01 - EP US); C21D 8/00 (2013.01 - EP US); C21D 2211/002 (2013.01 - EP US); C21D 2211/004 (2013.01 - EP US)
Citation (search report)
See references of WO 2014153491A1
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)
US 2014283954 A1 20140925; CN 105143473 A 20151209; EP 2976436 A1 20160127; JP 2016519715 A 20160707; KR 20150133759 A 20151130; WO 2014153491 A1 20140925
DOCDB simple family (application)
US 201313848812 A 20130322; CN 201480016291 A 20140321; EP 14768272 A 20140321; JP 2016504369 A 20140321; KR 20157029165 A 20140321; US 2014031398 W 20140321