To drastically save man-powers by unifying a lubricant film treatment to a wire before cold plastic working and a lubrication treatment applied to the surface of a fastening component after a heat treatment for stabilizing fastening property into one process, and to provide a steel wire which can obtain a fastening component exhibiting a stable black appearance regardless of its production process.
The steel wire for fastening components has a lubricant film containing, as essential components, (a) an alkali metal silicate in which the molar ratio of SiO2 to M2O (M represents alkali metal) is 2-5, (b) crystalline graphite having an average diameter of 10 m, and (c) a polyolefin wax, wherein the mass ratios of (b) and (c) to the total solid content are 1-30 mass% and 30-50 mass%, respectively.
NISHIMURA SHOJI
UEDA TAKAYUKI
HAGIWARA TOSHIAKI
UMEBACHI KOGYO KK
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