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:
Oct. 22, 2013
Filed:
Oct. 02, 2008
Masato Watanabe, Shinjuku-ku, JP;
Takashi Shirai, Shinjuku-ku, JP;
Masato Watanabe, Shinjuku-ku, JP;
Takashi Shirai, Shinjuku-ku, JP;
Kobelco & Materials Copper Tube, Ltd., Tokyo, JP;
Abstract
A copper alloy tube according to the present invention includes Sn 0.1 to 2.0 mass %, P 0.005 to 0.1 mass %, S 0.005 mass % or less, O 0.005 mass % or less, and H 0.0002 mass % or less, and the remainder has a composition consisting of Cu and unavoidable impurities. And, as is annealed, the copper alloy tube has the following characteristics: a tensile strength in the longitudinal direction of the copper alloy tube is 250 N/mmor more; an average grain diameter is 30 μm or less when measured in the direction perpendicular to the thickness direction of the tube, in the cross section perpendicular to the tube axis; and assuming that a tensile strength in the longitudinal direction of the copper alloy tube is σL, and a tensile strength in the circumferential direction of the same is σT, σT/σL>0.93 holds. [With such structure, the copper alloy tube can have a sufficiently high pressure-resistant breaking strength (breaking pressure) without deteriorating its bending workability due to an unnecessarily enhanced tensile strength, and further is excellent in its bending workability and heat resistance.]