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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.:

US 4913747 B1

PDFFull Text
Date of Patent:
Apr. 03, 1990

Filed:

Feb. 09, 1989

Method of and apparatus for heat-treating rails

Applicant:
Inventors:

Keiji Fukuda, Kitakyushu, JP;

Takefumi Suzuki, Kitakyushu, JP;

Hideaki Kageyama, Kitakyushu, JP;

Yoshiaki Makino, Kitakyushu, JP;

Masanori Hisatsune, Kitakyushu, JP;

Eigo Matsubara, Kitakyushu, JP;

Mitiaki Ishii, Kitakyushu, JP;

Manabu Sato, Kitakyushu, JP;

Haruo Koyama, Kitakyushu, JP;

Assignee:

Nippon Steel Corporation, Tokyo, JP;

Attorney:

Pollock, Vande Sande & Priddy

Primary Examiner:

S Kastler

Int. Cl.
CPC ...
C21D / ;
U.S. Cl.
CPC ...
148128 ; 148143 ; 148145 ;
Abstract

A method of heat-treating a rail for obtaining a variety of strength levels from medium value to high value. The method has the steps of: preparing a steel rail maintained at a high temperature region not lower than the austenite field, and disposing a nozzle means around the head of the rail such that the nozzle means can direct a gaseous cooling medium toward the head of the rail; determining the distance between the nozzle means and the head of the rail in accordance with both the hardness level to be attained in the head of the rail and the carbon equivalent of the steel constituting the rail; moving the nozzle means such that the distance is attained between the nozzle means and the head of the rail; and directing the gaseous cooling medium towards the head at a predetermined flow rate and for a predetermined time so as to cool the head of the rail thereby attaining the desired hardness level in the head of the rail.

Find Patent Forward Citations

Fukuda, Keiji. (1990). Method of and apparatus for heat-treating rails (U.S. Patent No. 4913747). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4913747

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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