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. 09, 1993
Filed:
Jun. 20, 1991
Akira Inagaki, Sakai, JP;
Masao Kurokawa, Sakai, JP;
Hiroyuki Hasegawa, Sakai, JP;
Toshihiro Ishibashi, Kitakyushu, JP;
Hiroaki Hadano, Kitakyushu, JP;
Takeshi Hioki, Kitakyushu, JP;
Yoshimi Toriyama, Kitakyushu, JP;
Kazuo Fujita, Sakai, JP;
Yasushi Takeshima, Sakai, JP;
Teruyuki Wakatsuki, Sakai, JP;
Yasushi Horiuchi, Sakai, JP;
Nippon Steel Corporation, Tokyo, JP;
Abstract
A thin-webbed H-beam steel having a web thinner that flanges is produced by forcibly water cooling the outer surface of the flanges during an intermediate hot rolling prior to a final hot rolling by cooling to less than 700.degree. C., interrupting the cooling to return the temperature to greater than 700.degree. C., and repeating the cooling and interrupting in order to refine the microstructure of the surface of the flanges to a predetermined depth from the surface; final-hot rolling the intermediate-hot rolled H-beam steel; and forcibly water cooling the flanges of the final-hot rolled H-beam steel in a manner such that the web does not wave during this forcible water cooling, and such that upon completion of the forcible water cooling, thermal stress, generated in the web during air cooling to room temperature, does not exceed the buckling strength of the web.