To provide a stainless steel wire for a spring, which is excellent in workability when it is formed into the spring although it does not contain nickel, and to provide a coil spring.
The stainless steel wire for the spring is obtained by drawing a stainless steel wire on which a phosphate coating film having a coating film amount of 6.0-14.5 g/m2 is formed. The surface roughness of the stainless steel wire for the spring is 1.5-2.3 μm. The stainless steel wire for the spring which hardly causes seizing or the like and on which a lubricant is uniformly and surely stuck can be obtained by applying the phosphate coating film having fine unevenness and setting the coating film amount of the phosphate coating film and the surface roughness to the values, respectively. When the coil spring is formed, the coil exhibits excellent workability by using the stainless steel wire for the spring.
SANO YUICHI
OKAMOTO KENICHI
TOCHIGI SUMITOMO DENKO KK
Shiro Terasaki
Masatoshi Shibata