| 摘要 |
<p>A threaded joint for steel pipe formed on a pin and a box having a contact surface including a threaded parts and a non-threaded metal contact part and capable of preventing a galling by repeated fastening and loosening operations without applying compound grease thereto, wherein a solid lubricating film including lubricating powder such as molybdenum disulfide and resin binder is formed on the contact surface of at least one of the pin and the bo by drying the film by primary heating in the temperature range of 70 DEG C to 150 DEG C and by a secondary heating in the range of from higher than 150 DEG C to 380 DEG C, the solid lubricating film thus obtained has a Rockwell M scale hardness of 70 to 140, an adhesive strength of 500 N/m or higher obtained by the SAICAS (Surface And Interfacial Cutting Analysis System) method, and excellent galling resistance and airtightness even in a high temperature well environment, and, when ultraviolet ray shielding particles such as titanium oxide are contained in the solid lubricating film, the rust-proofness of the threaded joint is increased. <IMAGE> <IMAGE></p> |
