US 7,608,130 B2
Method for producing high cleanliness steel excellent in fatigue strength or cold workability
Koichi Sakamoto, Kobe (Japan); Tomoko Sugimura, Kobe (Japan); Atsuhiko Yoshida, Kobe (Japan); Yoshio Fukuzaki, Kobe (Japan); and Sumie Suda, Kobe (Japan)
Assigned to Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.), Kobe-shi (Japan)
Appl. No. 10/564,061
PCT Filed Dec. 17, 2004, PCT No. PCT/JP2004/018920
§ 371(c)(1), (2), (4) Date Jan. 10, 2006,
PCT Pub. No. WO2005/071120, PCT Pub. Date Aug. 04, 2005.
Claims priority of application No. 2004-014693 (JP), filed on Jan. 22, 2004; application No. 2004-193553 (JP), filed on Jun. 30, 2004; and application No. 2004-290513 (JP), filed on Oct. 01, 2004.
Prior Publication US 2006/0156864 A1, Jul. 20, 2006
Int. Cl. C21C 7/04 (2006.01); C21C 7/06 (2006.01)
U.S. Cl. 75—570  [148/320] 21 Claims
OG exemplary drawing
 
1. A high-cleanliness steel having a total-Li content between 0.020 and 9 ppm by mass and containing 1.0 or below of oxide inclusion particles having a major diameter of 20 μm or above in 50 g of the steel.