Screw joint for steel pipe

A steel pipe with the threaded connector, comprising to provide the faying surfaces external thread (1) and female (2), the faying surfaces of the comprising a thread part (3) or (4) and a thread-free metal contact part (8); and at least one surface of the external thread on circumference of the lower layer, lubricant coating is a liquid lubricating display and repair ability, and a limit surface viscosity. the lubricant coating is: (1) Comprises a 0℃ to 40℃ is a liquid type oil level and is overlapped 40℃ is a solid lubricating oil level coating, or (2) is 40℃ is a semi-solid or a solid lubricating form's coating, comprising 0℃ to 40℃ is a liquid the lubricant (through the dissolution of oil and 40℃ is a solid are wax adjusting preferably a front mixing, thereby candle drippings beforehand, and a on the adjusting for lubricating oil collector and rubber).