PURPOSE: To produce an extra fine steel wire maintaining a twisting characteristic, enhanced in excellent corrosion resistance and corrosive fatigue characteristic, and useful as an extra fine steel wire capable of being twisted into a steel cord or miniature rope used for reinforcing a tire or belt, by specifying the shape of its cross section to prevent galvanic corrosion.
CONSTITUTION: This extra fine steel wire has a cross section outer shape line expressed by an arbitrary closed curve belonging to a region formed between a closed curved obtained by turning back a curve expressed by a below- described equality [1] on the X and Y axes and a closed curve obtained by turning back a curve expressed by a below-described equality [2] on the X and Y axes, and has an (a)/(b) ratio of 1.05-5.0 and a (2a) of ≤1.0mm. (x10/a10)+(y10/b10)=-1...[1], (x1.2/a1.2)+(y1.2/b1.2)=-1...[2] (0≤x≤a and 0≤y≤b; when (x) is 0, (y) is (b), and when (y) is 0, (x) is (a)).
MIYAUCHI SHIGEAKI
NAKAYAMA TAKENORI
IBARAKI NOBUHIKO
OCHIAI KENJI
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