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. 02, 2012
Filed:
Sep. 01, 2009
Masanari Kimoto, Kobe, JP;
Kunio Goto, Kobe, JP;
Masaru Takahashi, Narashino, JP;
Kunihiro Fukui, Kawanishi, JP;
Shigeo Nagasaku, Nishinomiya, JP;
Ryuichi Imai, Kainan, JP;
Shigeo Onishi, Osaka, JP;
Hiroaki Ikegami, Nishinomiya, JP;
Masanari Kimoto, Kobe, JP;
Kunio Goto, Kobe, JP;
Masaru Takahashi, Narashino, JP;
Kunihiro Fukui, Kawanishi, JP;
Shigeo Nagasaku, Nishinomiya, JP;
Ryuichi Imai, Kainan, JP;
Shigeo Onishi, Osaka, JP;
Hiroaki Ikegami, Nishinomiya, JP;
Sumitomo Metal Industries, Ltd., Osaka, JP;
Vallourec Mannesmann Oil & Gas France, Aulnoye-Aymeries, FR;
Abstract
A threaded joint for steel tubes has a contact surface () including a threaded portion and a non-threaded metal-to-metal contact portion. The contact surface of at least one of a pin and a box of the joint is coated with a first plating layer () made of a Cu—Zn alloy or a Cu—Zn-M1 alloy (wherein M1 is at least one element selected from Sn, Bi, and In). An undercoat () of one or both of a Ni plating layer () and a Cu plating layer () and an overcoat of a Sn-M2 alloy plating layer () (wherein M2 is one or more elements selected from Bi, In, Ni, Zn, and Cu) may be formed below and above the first layer, respectively. A solid lubricating coating () and a viscous liquid or semisolid lubricating coating () may also be formed atop the plating layer as a lubricating coating ().