| abstract |
(57) [Problem] To provide a metal which has lubricity equal to or higher than that of a conventional product even with a small amount of lubricating film, has a long liquid life, and reduces dust generated during cold plastic working. Providing water-based lubricants for cold plastic working of materials. SOLUTION: The carbon number 10 having at least one double bond is 10 or more. An aqueous lubricant for cold plastic working of a metal material, comprising an alkali metal salt (A) of a dimer acid or trimer acid of an unsaturated fatty acid and water. Here, more than 0% by weight and not more than 95% by weight of the alkali metal salt of dimer acid or trimer acid (A) can be replaced by the alkali metal salt of saturated fatty acid having 10 to 24 carbon atoms (B). |