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. 30, 1988
Filed:
Oct. 15, 1986
Kozo Fukuda, Tokyo, JP;
Tsunemi Wada, Tokyo, JP;
Shinichi Nagahashi, Tokyo, JP;
Yoshio Saito, Tokyo, JP;
Masahiro Ueda, Tokyo, JP;
Minoru Tanaka, Tokyo, JP;
Nippon Kokan Kabushiki Kaisha, Tokyo, JP;
Abstract
A wear resistance rail which comprises 0.50 to 0.85 wt. % of C, 0.10 to 1.0 wt. % of Si, 0.50 to 1.50 wt. % of Mn, less than 0.035 wt. % of P, less than 0.035 wt. % of S, less than 0.050 wt. % of Al, and the balance of iron and impurities. The web has a high toughness tempered bainite structure, tempered martensite structure or a tempered mixed structure of bainite and martensite and the head rail has high wear resistance which prevents unstable destructive cracks from propagating. The rail can further contain one or more of 0.05 to 1.50 wt. % of Cr, 0.05 to 0.20 wt. % of Mo, 0.03 to 0.10 wt. % of V, 0.10 to 1.00 wt. % of Ni, and 0.005 to 0.050 wt. % of Nb.