EP 2141254 A4 20110914 - STEEL INGOT FOR FORGING AND INTEGRAL CRANKSHAFT
Title (en)
STEEL INGOT FOR FORGING AND INTEGRAL CRANKSHAFT
Title (de)
STAHLBLOCK ZUM SCHMIEDEN UND INTEGRALE KURBELWELLE
Title (fr)
LINGOT D'ACIER POUR FORGEAGE ET VILEBREQUIN MONOBLOC
Publication
Application
Priority
- JP 2008054966 W 20080318
- JP 2007089336 A 20070329
- JP 2007167849 A 20070626
- JP 2007207100 A 20070808
Abstract (en)
[origin: WO2008120574A1] A steel ingot for forging that excels in fatigue performance and hydrogen cracking resistance; and an integral crankshaft therefrom. The steel ingot for forging is produced with use of a casting mold, wherein the density (D<SUB>BOT</SUB>) of inclusions of 5 to 10 µm major diameter observed on a steel section in an inferior portion of the steel ingot is 10 to 80 inclusions/cm<SUP>2</SUP>; the density (D<SUB>TOP</SUB>) of inclusions of 5 to 10 µm major diameter observed on a steel section in a superior portion of the steel ingot is 20 to 90 inclusions/cm<SUP>2</SUP>; the density of inclusions of 40 µm or greater major diameter observed on a steel section in both inferior and superior portions of the steel ingot is 5 inclusions/cm<SUP>2</SUP> or less; and the densities satisfy the relationship (D<SUB>TOP</SUB>)/(D<SUB>BOT</SUB>)=[S(ppm)]/18. The integral crankshaft is produced by hot forging of this steel ingot for forging.
IPC 8 full level
C22C 38/00 (2006.01); B22D 7/00 (2006.01); C21C 7/00 (2006.01); C21C 7/072 (2006.01); C21C 7/10 (2006.01); C22C 38/50 (2006.01); C22C 38/60 (2006.01)
CPC (source: EP KR)
B22D 7/00 (2013.01 - EP KR); C22C 38/02 (2013.01 - EP KR); C22C 38/04 (2013.01 - EP KR); C22C 38/06 (2013.01 - EP KR); C22C 38/44 (2013.01 - EP KR); C22C 38/46 (2013.01 - EP KR)
Citation (search report)
- [XI] US 6165289 A 20001226 - MATSUMOTO YOICHI [JP], et al
- See references of WO 2008120574A1
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR
DOCDB simple family (publication)
WO 2008120574 A1 20081009; CN 101631886 A 20100120; CN 101631886 B 20110511; EP 2141254 A1 20100106; EP 2141254 A4 20110914; EP 2141254 B1 20160504; ES 2572612 T3 20160601; KR 101121313 B1 20120322; KR 20090115886 A 20091109; PL 2141254 T3 20161031
DOCDB simple family (application)
JP 2008054966 W 20080318; CN 200880005658 A 20080318; EP 08722360 A 20080318; ES 08722360 T 20080318; KR 20097020253 A 20080318; PL 08722360 T 20080318