Oil-well metal pipe

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, and
• the box includes:
• a box contact surface including an internal thread part,
• the oil-well metal pipe further comprising:
• a Zn—Ni alloy plating layer formed on at least one of the pin contact surface and the box contact surface,
• wherein X-ray diffraction intensities of the Zn—Ni alloy plating layer satisfy Formula (1):
• I
• 18
• /
• (
• I
• 18
• +
• I
• 36
• +
• I
• 54
• )
• ≥
• 0.6
• (
• 1
• )
• where, an X-ray diffraction intensity of {411} and {330} such that a sum of squares of the Miller indices becomes 18 is substituted, in units of cps, for I18 in Formula (1);
• an X-ray diffraction intensity of {442} and {600} such that a sum of squares of the Miller indices becomes 36 is substituted, in units of cps, for I36 in Formula (1);
• and an X-ray diffraction intensity of {552} such that a sum of squares of the Miller indices becomes 54 is substituted, in units of cps, for I54 in Formula (1).