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:
Jul. 15, 2014
Filed:
Nov. 21, 2011
Hideyuki Nakamura, Tokyo, JP;
Isao Anai, Tokyo, JP;
Yasushi Yamamoto, Tokyo, JP;
Takaaki Fukushi, Tokyo, JP;
Izuru Yamamoto, Toyota, JP;
Masaaki Kondo, Nagoya, JP;
Satoru Shimazu, Nisshin, JP;
Hideyuki Nakamura, Tokyo, JP;
Isao Anai, Tokyo, JP;
Yasushi Yamamoto, Tokyo, JP;
Takaaki Fukushi, Tokyo, JP;
Izuru Yamamoto, Toyota, JP;
Masaaki Kondo, Nagoya, JP;
Satoru Shimazu, Nisshin, JP;
Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;
Toyota Jidosha Kabushiki Kaisha, Aichi, JP;
Abstract
The present invention provides a steel material for automobile chassis parts, having high fatigue characteristics, without a heat treatment, and superior shapeability, and a method of production of such automobile chassis parts. The surface of the steel has a high hardness and the center has a low hardness, providing the superior characteristics. With an annealing step of the invention, it is possible to relieve internal stress and further improve fatigue characteristics.