18730044. OIL-WELL METAL PIPE (NIPPON STEEL CORPORATION)
OIL-WELL METAL PIPE
Organization Name
Inventor(s)
Tomoka Abe of Chiyoda-ku, Tokyo JP
Koji Akioka of Chiyoda-ku, Tokyo JP
Tomoya Matsuyama of Chiyoda-ku, Tokyo JP
OIL-WELL METAL PIPE
This abstract first appeared for US patent application 18730044 titled 'OIL-WELL METAL PIPE
Original Abstract Submitted
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 ().