Refrigerant pipe, heat exchanger, and method for producing refrigerant pipe

An intermediate product of a refrigerant pipe comprising:

• a pipe body including copper or a copper alloy;
• and
• an anticorrosive film formed on an outer surface of the pipe body,
• wherein the anticorrosive film includes
• a volatile metalworking fluid that is capable of being volatilized at 180° C. or higher, and
• one or more anticorrosive agents selected from the group consisting of
• calcium dinonylnaphthalene sulfonate or an organic sulfonate compound represented by formula (III) below and/or an organic sulfonate compound represented by formula (IV) below, in an amount of 0.1 μg or more and 200.0 μg or less per square centimeter:
• wherein R1 to R7 each independently represent hydrogen or an aliphatic hydrocarbon group having 4 to 12 carbon atoms except that R1 to R7 cannot all be hydrogen, and M represents Ca or Zn,
• wherein R1 to R7 each independently represent hydrogen or an aliphatic hydrocarbon group having 4 to 12 carbon atoms except that R1 to R7 cannot all be hydrogen, and M represents Ca or Zn.