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.:
Date of Patent:
Feb. 01, 2011
Filed:
Feb. 03, 2005
Takashi Kobayashi, Chiyoda-ku, JP;
Hiroshi Nakata, Chiyoda-ku, JP;
Chikara Kami, Chiyoda-ku, JP;
Toru Inazumi, Chiyoda-ku, JP;
Shuji Kawamura, Chiyoda-ku, JP;
Takashi Kobayashi, Chiyoda-ku, JP;
Hiroshi Nakata, Chiyoda-ku, JP;
Chikara Kami, Chiyoda-ku, JP;
Toru Inazumi, Chiyoda-ku, JP;
Shuji Kawamura, Chiyoda-ku, JP;
JFE Steel Corporation, , JP;
Abstract
A hot-rolled steel sheet for high-strength ERW pipes contains about 0.02% to about 0.06% C; about 0.05% to about 0.50% Si; about 0.5% to about 1.5% Mn; about 0.010% or less P; about 0.0010% or less S; about 0.01% to about 0.10% Al; about 0.01% to about 0.10% Nb; about 0.001% to about 0.025% Ti; about 0.001% to about 0.005% Ca; about 0.003% or less 0; and about 0.005% or less N, and at least one element selected from the group consisting of about 0.01% to about 0.10% V; about 0.01% to about 0.50% Cu; about 0.01% to about 0.50% Ni; and about 0.01% to about 0.50% Mo on the basis of mass. The group of C, Si, Mn, Cu, Ni, Mo, and V and the group of Ca, 0, and S satisfy specific relationships, and the microstructure of the steel sheet is composed of about 95% by volume or more bainitic ferrite.