METAL PIPE FOR OIL WELL AND COMPOSITION FOR FORMING A LUBRICANT CASING LAYER FOR METAL PIPE FOR OIL WELL

Claims

This disclosure provides a metallic oil well pipe that has excellent resistance to seizing and has low backing torque and increased torque performance. A metallic oil well pipe (1) according to this disclosure is provided with a main pipe body (10) including a stem (40) formed in a first end portion (10A) and with a stem contact surface (400) that includes an external thread portion (41), and includes a box (50) formed in a second end portion (10B) and with a box contact surface (500) that includes an internal thread portion (51).A lubricating coating layer (100) that forms as a top layer on the contact surface of the stem (400) and / or the contact surface of the case (500) contains a metallic particle: 12.0 to 35.0%, metallic soap: 2.0 to 30.0%, wax: 2.0 to 30.0%, basic metallic salt of an aromatic organic acid: 20.0 to 80.0%, rosin-based material: 2.0 to 30.0%, and lubricating powder: 0.1 to 10.0%, and a Vickers hardness of the metallic particle is not greater than a Vickers hardness of the main body of the tube (10).