Ultrahigh-strength thin steel sheet

Details Ultrahigh-strength thin steel sheet Ultrahigh-strength thin steel sheet

2011-02-15

2011-02-15

Yee, Deborah (Department: 1793)

Metal treatment

Stock

Ferrous

C148S332000, C148S330000, C148S336000

Reexamination Certificate

active

07887648

ABSTRACT:
The invention relates to an ultrahigh-strength thin steel sheet excellent in the hydrogen embrittlement resistance, the steel sheet including, by weight %, 0.10 to 0.60% of C, 1.0 to 3.0% of Si, 1.0 to 3.5% of Mn, 0.15% or less of P, 0.02% or less of S, 1.5% or less of Al, 0.003 to 2.0% of Cr, and a balance including iron and inevitable impurities; in which grains of residual austenite have an average axis ratio (major axis/minor axis) of 5 or more, the grains of the residual austenite have an average minor axis length of 1 μm or less, and the grains of the residual austenite have a nearest-neighbor distance between the grains of 1 μm or less.

REFERENCES:
patent: 2005/0150580 (2005-07-01), Akamizu et al.
patent: 2006/0137768 (2006-06-01), Yuse et al.
patent: 2006/0137769 (2006-06-01), Yuse et al.
patent: 2006/0169366 (2006-08-01), Yuse et al.
patent: 2006/0169367 (2006-08-01), Yuse et al.
patent: 0 922 782 (1999-06-01), None
patent: 0 974 677 (2000-01-01), None
patent: 0 997 548 (2000-05-01), None
patent: 1 365 037 (2003-11-01), None
patent: 1 553 202 (2005-07-01), None
patent: 11 293383 (1999-10-01), None
patent: 2003 166035 (2003-06-01), None
patent: 2004-169180 (2004-06-01), None
patent: 2004 308002 (2004-11-01), None
patent: 2004 332099 (2004-11-01), None
patent: 2005 97725 (2005-04-01), None
patent: 2005 220440 (2005-08-01), None
English translation of Japanese patent 2004-190050, Kashima et al., Jul. 8, 2004.
U.S. Appl. No. 12/610,727, filed Nov. 2, 2009, Ikeda, et al.
Yamada, Toshiro et al., “The Mixed Structure With Bainite and Retained Austenite in a Si-Mn Steel”, Nissin Steel Technical Report, No. 43, pp. 1-10 (1980) (with English abstract).
“New Development in Elucidation of Delayed Fracture (Okurehakaikaimei No Shintenkai)”, The Iron and Steel Institute of Japan, pp. 111-120 (1997) (with partial English translation).
U.S. Appl. No. 12/477,299, filed Jun. 3, 2009, Ikeda, et al.
U.S. Appl. No. 12/303,566, filed Dec. 5, 2008, Nakaya, et al.
U.S. Appl. No. 12/303,634, filed Dec. 5, 2008, Nakaya, et al.
U.S. Appl. No. 12/305,998, filed Dec. 22, 2008, Saito, et al.
Supplementary European Search Report issued Oct. 4, 2010 in Application No. EP 06843656, filed Dec. 28, 2006.

Affiliated with

Also associated with

Rating

Ultrahigh-strength thin steel sheet does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Ultrahigh-strength thin steel sheet, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ultrahigh-strength thin steel sheet will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2641600