STEEL FOR FORGING, PROCESS FOR PRODUCING THE SAME, AND FORGED ARTICLE

WIPO Patent Application WO/2007/148475

A1

A steel for forging which is for obtaining a forged article with excellent fatigue properties and in which inclusions have been reduced in size; and a useful process for producing the steel for forging. Also provided is a forged article (especially, solid type crankshaft) obtained from the steel for forging. It can have satisfactory fatigue properties and the inclusions therein have been reduced in size. The steel for forging is characterized in that the concentration of magnesium in solution in the steel is 0.04-5 ppm and that of aluminum in solution in the steel is 50-500 ppm.

DEURA TETSUSHI
NAGAO MOTOHIRO
TOMIOKA ATSUSHI
FUKAYA SHOGO

PCT/JP2007/058848

December 27, 2007

April 24, 2007

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KOBE STEEL LTD (JP)
DEURA TETSUSHI
NAGAO MOTOHIRO
TOMIOKA ATSUSHI
FUKAYA SHOGO

C21C7/06; C21C7/00; C21C7/04; C22C38/00; C22C38/44; C22C38/60

JP2002020842A	2002-01-23
JP2002030387A	2002-01-31
JP2000129402A	2000-05-09
JP2004225128A	2004-08-12
JP2003213386A	2003-07-30
JP2003027189A	2003-01-29
JP2003113448A	2003-04-18
JPS5835255B2	1983-08-01
JPS5759295B2	1982-12-14
JPH07188853A	1995-07-25
JPH07238342A	1995-09-12
JP2000087179A	2000-03-28

"Progress and Improvement of Crankshaft", JOURNAL OF THE MARINE ENGINEERING SOCIETY OF JAPAN, vol. 8, no. 10, October 1973 (1973-10-01), pages 54 - 59
"Research on Fatigue Strength Characteristics of High-strength Crankshaft Materials", JOURNAL OF THE MARINE ENGINEERING SOCIETY OF JAPAN, vol. 36, no. 6, 2001, pages 385 - 390

OGURI, Shohei et al. (7-13 Nishi-Shimbashi 1-chome,Minato-ku, Tokyo03, JP)

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