| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method for providing an extra fine brass plating steel wire excellent in strength and ductility by omitting patenting and conducting a diffusion heat treatment for alloying Cu plating and Zn plating formed in a layered manner.SOLUTION: Cu plating and Zn plating are formed on a surface of a hot rolling wire material in a layered manner after conducting wire drawing with processing distortion &egr; of 0.5 to 1.6 on the hot rolling wire material containing, by mass%, C:0.3 to 1.1%, Si:0.5 to 2.0%, Mn:0.2 to 1.0% and Cr:0.5 to 1.0% and having wire diameter of 3.0 to 5.0 mm; a diffusion heat treatment is conducted so that a heating temperature is 450°C or more, tempering parameter P is in a range of 12000 to 13000 and the content of Si and Cr, the processing distortion &egr; and the tempering parameter P satisfy 2.5≥Si+Cr≥1.9×&egr;+0.0017×P-21.4; and further final wire drawing for making wire diameter at 0.2 to 0.4 mm is conducted. |
