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:
Aug. 14, 2007
Filed:
Feb. 11, 2003
Nozomu Kawabe, Hyogo, JP;
Teruyuki Murai, Hyogo, JP;
Koji Yamaguchi, Hyogo, JP;
Yukihiro Oishi, Hyogo, JP;
Nozomu Kawabe, Hyogo, JP;
Teruyuki Murai, Hyogo, JP;
Koji Yamaguchi, Hyogo, JP;
Yukihiro Oishi, Hyogo, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Abstract
A steel wire of pearlite structure containing 0.8-1.0 mass % of C and 0.8-1.5 mass % of Si is disclosed. In the cross section of the steel wire the difference in average hardness between a region up to 100 μm from the surface thereof and a deeper region is within 50 in micro-Vickers hardness. The steel wire is manufactured by working a wire rod having the abovementioned chemical composition through shaving, patenting and drawing processes, then strain-relief annealing the resultant wire, and thereafter subjecting the thus annealed to a shot peening process. The steel wire has a high heat resistance and a high fatigue strength, and can be produced through a drawing process without applying a quenching and tempering process.