Oil-well metal pipe
An oil-well metal pipe according to the present disclosure includes a resin coating on or above at least one of a pin contact surface and a box contact surface. The resin coating contains: a resin: 50.0 to 99.5 mass %, a wax: 0 to 10.0 mass %, a fluorine-based additive: 0 to 30.0 mass %, graphite: 0 to 10.0 mass %, a rust preventive pigment: 0 to 30.0 mass %, a coloring pigment: 0 to 10.0 mass %, a coupling agent: 0 to 10.0 mass %, and one type or two types selected from a group consisting of a magnesium silicate hydroxide powder: 1.5 to 50.0 mass % and TiO 2 : 0.5 to 30.0 mass %; and satisfies Formula (1). ( W+F+G )/( M+T )≤5.00 (1)
1 . An oil-well metal pipe, comprising:
a pipe main body including a first end portion and a second end portion;
wherein:
the pipe main body includes:
a pin formed at the first end portion, and
a box formed at the second end portion;
the pin includes:
a pin contact surface including an external thread part;
the box includes:
a box contact surface including an internal thread part;
the oil-well metal pipe further comprising:
a resin coating on or above at least one of the pin contact surface and the box contact surface;
the resin coating containing:
a resin: 50.0 to 99.5 mass %,
a wax: 0 to 10.0 mass %,
a fluorine-based additive: 0 to 30.0 mass %,
graphite: 0 to 10.0 mass %,
a rust preventive pigment: 0 to 30.0 mass %,
a coloring pigment: 0 to 10.0 mass %,
a coupling agent: 0 to 10.0 mass %, and
one type or two types selected from a group consisting of a magnesium silicate hydroxide powder: 1.5 to 50.0 mass % and TiO 2 : 0.5 to 30.0 mass %;
and satisfying Formula (1):
( W+F+G )/( M+T )≤5.00 (1)
where, in Formula (1), a content in mass % of the wax is substituted for W, a content in mass % of the fluorine-based additive is substituted for F, a content in mass % of the graphite is substituted for G, a content in mass % of the magnesium silicate hydroxide powder is substituted for M, and a content in mass % of the TiO 2 is substituted for T.
2 . The oil-well metal pipe according to claim 1 , wherein:
the resin is one type or two types selected from a group consisting of epoxy resin and urethan resin.
3 . The oil-well metal pipe according to claim 1 or claim 2 , wherein:
the pin contact surface further includes a pin sealing surface and a pin shoulder surface, and
the box contact surface further includes a box sealing surface and a box shoulder surface.