Tubular threaded joint and lubricating coating forming composition for use therein

Abstract

Provided is a composition for forming a lubricating coating to a tubular threaded joint. The composition contains a melamine cyanurate, a basic metal salt of an aromatic organic acid, and one or more kinds selected from the group consisting of a pine resin-based material, a wax, a metal soap, and a lubricating powder.

1 . A composition for forming a lubricating coating to a tubular threaded joint, the composition comprising:
 a melamine cyanurate;   a basic metal salt of an aromatic organic acid; and   one or more kinds selected from the group consisting of a pine resin-based material, a wax, a metal soap, and a lubricating powder.   
     
     
         2 . The composition according to  claim 1 ,
 wherein an amount of the melamine cyanurate is 0.5 to 30% by mass on a basis of a total amount of non-volatile components of the composition.   
     
     
         3 . The composition according to  claim 1 , further comprising:
 a volatile organic solvent.   
     
     
         4 . A tubular threaded joint comprising:
 a pin and a box, each of which includes a contact surface having a threaded portion and an unthreaded metal contact portion,   wherein the lubricating coating formed using the composition according to  claim 1  is provided on the contact surface of at least one of the pin and the box.   
     
     
         5 . The tubular threaded joint according to  claim 4 ,
 wherein a film thickness of the lubricating coating is 10 μm to 500 μm.   
     
     
         6 . The tubular threaded joint according to  claim 4 ,
 wherein the contact surface of at least one of the pin and the box having the lubricating coating is subjected to a surface treatment by a blasting, a pickling, a phosphate chemical conversion treatment, an oxalate chemical conversion treatment, a borate chemical conversion treatment, an electroplating, an impact plating, or a method selected from two or more kinds thereof before forming the lubricating coating.   
     
     
         7 . The tubular threaded joint according to  claim 4 ,
 wherein the lubricating coating is provided on the contact surface of one of the pin and the box, and   the contact surface of the other of the pin and the box is subjected to a surface treatment by a blasting, a pickling, a phosphate chemical conversion treatment, an oxalate chemical conversion treatment, a borate chemical conversion treatment, an electroplating, an impact plating, or a method performed in combination of two or more kinds thereof.   
     
     
         8 . The tubular threaded joint according to  claim 4 ,
 wherein the tubular threaded joint is used to connect a plurality of oil country tubular goods.   
     
     
         9 . A method of connecting a plurality of oil country tubular goods, the method comprising a step of
 connecting the plurality of the oil country tubular goods using the tubular threaded joint according to  claim 4  without using grease lubricating oil.   
     
     
         10 . The composition according to  claim 2 , further comprising:
 a volatile organic solvent.   
     
     
         11 . A tubular threaded joint comprising:
 a pin and a box, each of which includes a contact surface having a threaded portion and an unthreaded metal contact portion,   wherein the lubricating coating formed using the composition according to  claim 2  is provided on the contact surface of at least one of the pin and the box.   
     
     
         12 . A tubular threaded joint comprising:
 a pin and a box, each of which includes a contact surface having a threaded portion and an unthreaded metal contact portion,   wherein the lubricating coating formed using the composition according to  claim 3  is provided on the contact surface of at least one of the pin and the box.   
     
     
         13 . The tubular threaded joint according to  claim 5 ,
 wherein the contact surface of at least one of the pin and the box having the lubricating coating is subjected to a surface treatment by a blasting, a pickling, a phosphate chemical conversion treatment, an oxalate chemical conversion treatment, a borate chemical conversion treatment, an electroplating, an impact plating, or a method selected from two or more kinds thereof before forming the lubricating coating.   
     
     
         14 . The tubular threaded joint according to  claim 5 ,
 wherein the lubricating coating is provided on the contact surface of one of the pin and the box, and   the contact surface of the other of the pin and the box is subjected to a surface treatment by a blasting, a pickling, a phosphate chemical conversion treatment, an oxalate chemical conversion treatment, a borate chemical conversion treatment, an electroplating, an impact plating, or a method performed in combination of two or more kinds thereof.   
     
     
         15 . The tubular threaded joint according to  claim 6 ,
 wherein the lubricating coating is provided on the contact surface of one of the pin and the box, and   the contact surface of the other of the pin and the box is subjected to a surface treatment by a blasting, a pickling, a phosphate chemical conversion treatment, an oxalate chemical conversion treatment, a borate chemical conversion treatment, an electroplating, an impact plating, or a method performed in combination of two or more kinds thereof.   
     
     
         16 . The tubular threaded joint according to  claim 5 ,
 wherein the tubular threaded joint is used to connect a plurality of oil country tubular goods.   
     
     
         17 . The tubular threaded joint according to  claim 6 ,
 wherein the tubular threaded joint is used to connect a plurality of oil country tubular goods.   
     
     
         18 . The tubular threaded joint according to  claim 7 ,
 wherein the tubular threaded joint is used to connect a plurality of oil country tubular goods.   
     
     
         19 . A method of connecting a plurality of oil country tubular goods, the method comprising a step of
 connecting the plurality of the oil country tubular goods using the tubular threaded joint according to  claim 5  without using grease lubricating oil.   
     
     
         20 . A method of connecting a plurality of oil country tubular goods, the method comprising a step of
 connecting the plurality of the oil country tubular goods using the tubular threaded joint according to  claim 6  without using grease lubricating oil.