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. 02, 2010
Filed:
Mar. 20, 2002
Koichiro Inoue, Suita, JP;
Sadayuki Nakamura, Mie-ken, JP;
Kouji Itakura, Fujisawa, JP;
Yoshio Okada, Atsugi, JP;
Noriyuki Shiwaku, Tokyo, JP;
Jun Yoshida, Yokohama, JP;
Tomonori Miyazawa, Fujisawa, JP;
Hideaki Ohtaka, Kawasaki, JP;
Hidetoshi Satou, Yokohama, JP;
Wataru Naitou, Yokohama, JP;
Koichiro Inoue, Suita, JP;
Sadayuki Nakamura, Mie-ken, JP;
Kouji Itakura, Fujisawa, JP;
Yoshio Okada, Atsugi, JP;
Noriyuki Shiwaku, Tokyo, JP;
Jun Yoshida, Yokohama, JP;
Tomonori Miyazawa, Fujisawa, JP;
Hideaki Ohtaka, Kawasaki, JP;
Hidetoshi Satou, Yokohama, JP;
Wataru Naitou, Yokohama, JP;
Daido Steel Co., Ltd., Aichi-ken, JP;
Nissan Motor Co., Ltd., Kanagawa-ken, JP;
Abstract
Disclosed is a non-heat treated steel for hot forging, particularly suitable for producing connecting rods of automobile engines. The steel consists essentially of: by weight, C: 0.3-0.8%, Si: 0.1-2.0%, Mn: 0.3-1.5%, P: 0.01-0.15%, Cr: 0-1.0%, V: 0-0.4%, Al: 0-0.05%, N: 0.005-0.03% and the balance being Fe and inevitable impurities, provided that the contents of C, Mn and Cr fulfill the following condition: 1.40[C %]+0.28[Mn %]+0.50[Cr %]≧0.75 Pearlite area fraction in this steel after hot forging is 50% or more. Notches are provided with laser beam on an intermediate part at the location from which fracture starts, and load is applied. Then, the intermediate is split to be two components (big end or cap and small end/rod for connecting rod). The components are adhered to form the parts.