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:
Dec. 06, 2011
Filed:
Jun. 22, 2010
Nobusuke Kariya, Kanagawa, JP;
Norio Kanamoto, Chiba, JP;
Hidekazu Ookubo, Chiba, JP;
Yoshiharu Kusumoto, Chiba, JP;
Takeshi Fujita, Hiroshima, JP;
Nobusuke Kariya, Kanagawa, JP;
Norio Kanamoto, Chiba, JP;
Hidekazu Ookubo, Chiba, JP;
Yoshiharu Kusumoto, Chiba, JP;
Takeshi Fujita, Hiroshima, JP;
JFE Steel Corporation, Tokyo, JP;
Abstract
A high carbon hot-rolled steel sheet which is a hot-rolled spheroidizing annealed material, including 0.2 to 0.7% C, 2% or less Si, 2% or less Mn, 0.03% or less P, 0.03% or less S, 0.08% or less Sol.Al., and 0.01% or less N, by mass, which contains carbide having a particle size of smaller than 0.5 μm in a content of 15% or less by volume to the total amount of carbide, and the difference between the maximum hardness Hand the minimum hardness H, ΔH(=H−H), in the sheet thickness direction being 10 or smaller.