EP 1167561 A2 20020102 - Carburizing and carbonitriding steel
Title (en)
Carburizing and carbonitriding steel
Title (de)
Stahl zum Aufkohlen und Karbonitrieren
Title (fr)
Acier pour cémentation et carbonitruration
Publication
Application
Priority
JP 2000193780 A 20000628
Abstract (en)
A carburizing and carbonitriding steel, comprising, in percent by weight, C = 0.10 to 0.30%, Si = 0.40 to 1.00%, Mn = 0.30 to 1.50%, P = 0.035% or lower, S = 0.005 to 0.050%, Ni = 0.00 to 1.00%, Cr = 0.30 to 1.50%, Cu = 0.01 to 0.50%, Mo = 0.00 to 1.00%, Al = 0.010 to 0.035%, Nb = 0.001 to 0.050%, N = 0.0050 to 0.0200%, and O = 0.0015% or lower, wherein the parameter expressed as Mo + Ni ranges from 0.30% to 2.00%, with the balance being Fe and unavoidable impurity elements. The steel further contains one or more elements of V = 0.01 to 0.50%, Ti = 0.005 to 0.050%, and B = 0.0005 to 0.0050%. As elements that improve machinability without severely affecting fatigue characteristics, the steel may further contain one or more elements of Pb = 0.01 to 0.09%, Bi = 0.04 to 0.20%, Te = 0.002 to 0.050%, Zr = 0.01 to 0.20%, Ca = 0.0001 to 0.0100%. The steel is improved in pitting fatigue strength and impact strength at the same time because of the need to reduce the size and weight of mechanical components and to achieve higher stress load levels.
IPC 1-7
IPC 8 full level
C21D 9/28 (2006.01); C21D 9/32 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/20 (2006.01); C22C 38/22 (2006.01); C22C 38/26 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/48 (2006.01); C22C 38/60 (2006.01); C23C 8/22 (2006.01); C23C 8/32 (2006.01); C21D 1/78 (2006.01)
CPC (source: EP)
C21D 8/005 (2013.01); C21D 9/28 (2013.01); C21D 9/32 (2013.01); C22C 38/001 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/20 (2013.01); C22C 38/22 (2013.01); C22C 38/26 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/48 (2013.01); C22C 38/60 (2013.01); C23C 8/22 (2013.01); C23C 8/32 (2013.01); C21D 7/13 (2013.01)
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
Designated extension state (EPC)
AL LT LV MK RO SI
DOCDB simple family (publication)
DOCDB simple family (application)
EP 00125344 A 20001130