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:
Mar. 23, 2010
Filed:
Jan. 19, 2005
Tetsuo Soshiroda, Kakogawa, JP;
Masaaki Miura, Kakogawa, JP;
Tohru Shiogama, Kakogawa, JP;
Kobe Steel, Ltd., Kobe, JP;
Abstract
Disclosed is a high-strength hot-rolled steel sheet containing C in a range of 0.03 to 0.15 mass %, Mn in a range of 0.5 to 2 mass %, and Al in a range of 0.01 to 0.1 mass %, respectively, while controlling S to not more than 0.02 mass % (0% included), wherein the metallic structure thereof has a polygonal ferrite as the main phase, and contains martensite as a second phase, further containing P in a range of 0.030 to 0.08 mass %, and Cr in a range of 0.3 to 1.00 mass %, respectively, while controlling Si to not more than 0.1 mass % (0% included). Thus, a high-strength hot-rolled steel sheet superior in workability, and fatigue property, and excellent in surface quality is provided at a relatively low cost.