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:
Nov. 18, 2025
Filed:
Jan. 31, 2023
Nippon Steel Corporation, Tokyo, JP;
Vallourec Oil and Gas France, Aulnoye-Aymeries, FR;
Tomoka Abe, Tokyo, JP;
Koji Akioka, Tokyo, JP;
Tomoya Matsuyama, Tokyo, JP;
Takao Kuranishi, Tokyo, JP;
NIPPON STEEL CORPORATION, Tokyo, JP;
VALLOUREC OIL AND GAS FRANCE, Aulnoye-Aymeries, FR;
Abstract
Provided is an oil-well metal pipe which has excellent galling resistance even when a plating layer is formed on or above a contact surface of only one of a pin and a box. An oil-well metal pipe () according to the present disclosure includes: a pin () including a pin contact surface () with an external thread part (); and a box () including a box contact surface () with an internal thread part (). The oil-well metal pipe () according to the present disclosure further includes: a zirconium oxide coating () formed on one of the pin contact surface () and the box contact surface (); a first resin coating () formed on or above the zirconium oxide coating (); a plating layer () formed on or above the other of the pin contact surface () and the box contact surface (); and a second resin coating () formed on or above the plating layer ().