| abstract |
Thread joints for pipes and their manufacturing methods that suppress the occurrence of rust, exhibit excellent seizure resistance and airtightness, and are less sticky on the surface, without using compound grease even in a cryogenic environment, and the thread joints for pipes A composition for forming a solid lubricating coating is provided. The contact surface of at least one of the pin and the box is coated with a solid lubricating film (24) formed from a composition containing a binder, a fluorine-based additive, a solid lubricant and an antirust additive as an uppermost surface treatment film. Is done. The solid lubricating coating (24) can maintain adhesion even when exposed to a cryogenic environment, can exhibit its lubricity imparting function, suppress seizure of the threaded joint, and ensure airtightness after fastening. Can do. |