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:
Nov. 01, 2011
Filed:
Feb. 26, 2007
Hideyuki Kimura, Tokyo, JP;
Takeshi Fujita, Tokyo, JP;
Nobuyuki Nakamura, Tokyo, JP;
Naoya Aoki, Tokyo, JP;
Masato Sasaki, Tokyo, JP;
Satoshi Ueoka, Tokyo, JP;
Shunji Iizuka, Tokyo, JP;
Hideyuki Kimura, Tokyo, JP;
Takeshi Fujita, Tokyo, JP;
Nobuyuki Nakamura, Tokyo, JP;
Naoya Aoki, Tokyo, JP;
Masato Sasaki, Tokyo, JP;
Satoshi Ueoka, Tokyo, JP;
Shunji Iizuka, Tokyo, JP;
JFE Steel Corporation, , JP;
Abstract
An ultra soft high carbon hot-rolled steel sheet has excellent workability. The steel sheet is a high carbon hot-rolled steel sheet containing 0.2 to 0.7% C, and has a structure in which mean grain size of ferrite is 20 μm or larger, the volume percentage of ferrite grains having 10 μm or smaller size is 20% or less, mean diameter of carbide is in a range from 0.10 μm to smaller than 2.0 μm, the percentage of carbide grains having 5 or more of aspect ratio is 15% or less, and the contact ratio of carbide is 20% or less.