EP 1871917 A1 20080102 - BORON STEEL GRADE FOR INDUCTION HARDENING AND SHAFT
Title (en)
BORON STEEL GRADE FOR INDUCTION HARDENING AND SHAFT
Title (de)
BORSTAHLQUALITÄT ZUM INDUKTIONSHÄRTEN UND WELLE
Title (fr)
QUALITE D'ACIER AU BORE DURCI PAR INDUCTION ET ARBRE
Publication
Application
Priority
- SE 2006050059 W 20060406
- SE 0500812 A 20050412
Abstract (en)
[origin: WO2006110100A1] Low-alloy boron steel grade, e.g. for shafts, which by induction hardening of a surface zone are given an improved fatigue and static strength. The greatest improvement in fatigue strength is obtained by stationary (single shot) induction hardening, due to higher compressive stresses in the surface compared to those obtained by progressive (scanning method) induction hardening. High corresponding tensile stresses in the shaft centre have, however, proved to be able to cause central cracks for these steel grades. The invention means that by using slightly increased contents of molybdenum and nickel as compared with those which as a rule appear as impurities in boron steel of standard composition without specification of the molybdenum and nickel content, the occurrence of central cracks is eliminated.
IPC 8 full level
C22C 38/54 (2006.01)
CPC (source: EP SE)
C22C 38/02 (2013.01 - EP); C22C 38/04 (2013.01 - EP); C22C 38/54 (2013.01 - EP SE)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
WO 2006110100 A1 20061019; BR PI0608675 A2 20100119; CN 101155941 A 20080402; CN 101155941 B 20100908; EP 1871917 A1 20080102; JP 2008537982 A 20081002; SE 0500812 L 20060124; SE 527221 C2 20060124
DOCDB simple family (application)
SE 2006050059 W 20060406; BR PI0608675 A 20060406; CN 200680011618 A 20060406; EP 06717138 A 20060406; JP 2008506416 A 20060406; SE 0500812 A 20050412