METAL WORKING FLUID COMPOSITION, WORKING METHOD USING THE SAME AND METAL-WORKED COMPONENT MANUFACTURED BY THE WORKING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a metal working fluid having excellent machinability, and metal working method using the same.SOLUTION: There is provided a metal working fluid composition which contains following components (A) to (C): (A) at least one kind selected from a group consisting of a mineral oil, a synthetic hydrocarbon oil and a synthetic ester oil as a base oil, (B) at least tertiary alkanolamine as amine and (C) carboxylic acid and/or carboxylic acid derivative, which does not contain hydroxy carboxylic acid having 2 to 8 carbon atoms, and which has an amine value of the whole constituent of 10 to 100 mgKOH/g, a ratio of an acid value of the whole constituent (AV) and the amine value (BN), (BN/AN) of 1.0 to 2.0, where 25% or more of the amine value is attributable to the tertiary alkanolamine.