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:
Jun. 25, 2013
Filed:
May. 15, 2009
Takuya Kochi, Kobe, JP;
Shogo Murakami, Kobe, JP;
Hiroshi Yaguchi, Kobe, JP;
Takeshi Kuroda, Kakogawa, JP;
Hidenori Sakai, Kakogawa, JP;
Tomotada Maruo, Kobe, JP;
Takaaki Minamida, Kakogawa, JP;
Takuya Kochi, Kobe, JP;
Shogo Murakami, Kobe, JP;
Hiroshi Yaguchi, Kobe, JP;
Takeshi Kuroda, Kakogawa, JP;
Hidenori Sakai, Kakogawa, JP;
Tomotada Maruo, Kobe, JP;
Takaaki Minamida, Kakogawa, JP;
Kobe Steele, Ltd., Kobe-shi, JP;
Abstract
A high carbon steel wire material which is made of high carbon steel as a raw material for wire products such as steel cords, bead wires, PC steel wires and spring steel, allows for these wire products to be manufactured efficiently at a high wire drawing rate and has excellent wire drawability and a manufacturing process thereof. This high carbon steel wire material is made of a steel material having specific contents of C, Si, Mn, P, S, N, Al and O, and the Bcc-Fe crystal grains of its metal structure have an average crystal grain diameter (D) of 20 μm or less and a maximum crystal grain diameter (D) of 120 μm or less, preferably an area ratio of crystal grains having a diameter of 80 μm or more of 40% or less, an average sub grain diameter (d) of 10 μm or less, a maximum sub grain diameter (d) of 50 μm or less and a (D/d) ratio of the average crystal grain diameter (D) to the average sub grain diameter (d) of 4.5 or less.