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. 11, 2017
Filed:
Aug. 04, 2011
Tatsuo Tomomori, Yamaguchi, JP;
Koh Yoshioka, Yamaguchi, JP;
Tatsuo Tomomori, Yamaguchi, JP;
Koh Yoshioka, Yamaguchi, JP;
TOYO KOHAN CO., LTD., Tokyo, JP;
Abstract
Provided are a pipe which exhibits corrosion resistance against vapor of fuel such as gasoline, diesel oil, bioethanol or a biodiesel fuel, a method for manufacturing the pipe, and a steel sheet for manufacturing the pipe. A method for manufacturing a pipe having a bent portion which has excellent corrosion resistance against fuel vapor includes the steps of; preparing a steel sheet for manufacturing a pipe which is characterized by having a zinc-nickel (Zn—Ni) alloy layer where a nickel content is 4 to 16 at % on at least one surface of the steel sheet; forming the steel sheet for manufacturing a pipe into a tubular shape such that the Zn—Ni alloy layer forms an inner surface of the pipe, and applying bending to the pipe such that the elongation of the bent convex portion generated at the time of bending the pipe falls within 20%. A steel sheet for manufacturing a pipe having excellent corrosion resistance against fuel vapor has a Zn—Ni alloy layer on at least an uppermost surface of a surface thereof which constitutes an inner surface of the pipe, and a nickel content in the Zn—Ni alloy layer is 4 to 16 at %.