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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 6814819 B1

PDFFull Text
Date of Patent:
Nov. 09, 2004

Filed:

May. 02, 2003

Methods of manufacturing hot-dip galvanized hot-rolled and cold-rolled steel sheets excellent in strain age hardening property

Applicant:
Inventors:

Saiji Matsuoka, Okayama, JP;

Tetsuo Shimizu, Okayama, JP;

Kei Sakata, Chiba, JP;

Osamu Furukimi, Chiba, JP;

Assignee:

JFE Steel Corporation, , JP;

Attorney:

Piper Rudnick LLP

Primary Examiner:

Deborah Yee

Int. Cl.
CPC ...
C21D 8/02 ;
U.S. Cl.
CPC ...
C21D 8/02 ;
Abstract

The present invention provides a steel sheet having a chemical composition comprising 0.15% or less C, 2.0% or less Si, 3.0% or less Mn, P, S, Al and N in adjusted amounts, from 0.5 to 3.0% Cu, or one or more of Cr, Mo and W in a total amount of 2.0% or less, and having a composite structure comprising ferrite and martensite having an area ratio of 2% or more. The steel sheet is in the form of a high-strength hot-rolled steel sheet, a high-strength cold-rolled steel sheet, or a hot-dip galvanized steel sheet. There is thus available a steel sheet excellent in press-formability and in strain age hardening property as represented by a &Dgr;TS of 80 MPa or more.

Find Patent Forward Citations

Matsuoka, Saiji. (2004). Methods of manufacturing hot-dip galvanized hot-rolled and cold-rolled steel sheets excellent in strain age hardening property (U.S. Patent No. 6814819). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/6814819

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