| abstract |
(57) [Abstract] [Problem] It can be formed with less influence on the environment, has good adhesion to metal material surface, has excellent lubricant retention and introduction properties, and has excellent lubricity and corrosion resistance. Provided is a carrier film for cold plastic working. A film formed on the surface of a metal material to be subjected to cold plastic working, comprising a mixed film of a crystalline inorganic compound and an amorphous inorganic material, and having a surface roughness (ten-point average roughness) of the film. Rz) is a carrier film for cold plastic working having a thickness of 2 to 10 μm. The crystalline inorganic compound is preferably one or more selected from sulfate, phosphate and alum, and the amorphous inorganic substance is one or more selected from silicate, clay mineral and borate. preferable. |