Metal treatment – Stock – Ferrous
Reexamination Certificate
2003-12-26
2010-11-09
Yee, Deborah (Department: 1793)
Metal treatment
Stock
Ferrous
C148S328000, C148S331000, C148S332000, C148S336000, C148S602000, C148S654000, C148S664000
Reexamination Certificate
active
07828912
ABSTRACT:
This invention provides a high-strength hot-rolled steel sheet having strength of at least 980 N/mm2at a sheet thickness of from about 1.0 to about 6.0 mm and excellent in hole expandability, ductility and ability of phosphate coating, which steel sheet is directed to automotive suspension components that are subjected to pressing. The high-strength hot-rolled steel sheet contains, in terms of a mass %, C: 0.01 to 0.09%, Si: 0.05 to 1.5%, Mn: 0.5 to 3.2%, Al: 0.003 to 1.5%, P: 0.03% or below, S: 0.005% or below, Ti: 0.10 to 0.25%, Nb:0.01 to 0.05% and the balance consisting of iron and unavoidable impurities;satisfies all of the following formulas <1> to <3>:in-line-formulae description="In-line Formulae" end="lead"?0.9≦48/12×C/Ti<1.7 <1>in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?50,227×C−4,479×Mn>−9,860 <2>in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?811×C+135×Mn+602×Ti+794×Nb>465 <3>,in-line-formulae description="In-line Formulae" end="tail"?and has strength of at least 980 N/mm2.
REFERENCES:
patent: 5470529 (1995-11-01), Nomura et al.
patent: 6364968 (2002-04-01), Yasuhara et al.
patent: 2004/0035508 (2004-02-01), Okada et al.
patent: 475096 (1992-03-01), None
patent: 1348771 (2003-10-01), None
patent: 06-200351 (1994-07-01), None
patent: 06200351 (1994-07-01), None
patent: 06-287685 (1994-10-01), None
patent: 06293910 (1994-10-01), None
patent: 07-011382 (1995-01-01), None
patent: 7-68601 (1995-07-01), None
patent: 7-316736 (1995-12-01), None
patent: 8-143952 (1996-06-01), None
patent: 08199291 (1996-08-01), None
patent: 2000-336455 (2000-12-01), None
patent: 2001-342543 (2001-12-01), None
patent: 2003-342684 (2003-12-01), None
Machine English translation of Japanese patent 2002-180188, Okada et al., Jun. 26, 2002.
Machine English translation of Japanese patent 2002-180189, Okada et al, Jun. 26, 2002.
Machine English translation of Japanese patent 2002-180190, Okada et al., Jun. 26, 2002.
Fukuda Masashi
Okamoto Riki
Taniguchi Hirokazu
Kenyon & Kenyon LLP
Nippon Steel Corporation
Yee Deborah
LandOfFree
High-strength hot-rolled steel shaft excellent in hole... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with High-strength hot-rolled steel shaft excellent in hole..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High-strength hot-rolled steel shaft excellent in hole... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4219280