| 摘要 |
PURPOSE:To obtain a steel wire excellent in welding workability by inserting the stage performing heat treatment under the controlling atm. having specific oxygen potentiality higher than a CuO oxygen dissociation pressure value after Cu plating stage or finishing wire drawing stage. CONSTITUTION:The steel wire 17 hot rolled in the necessary diameter is subjected to Cu plating inside a plating tank 6 via a plating pretreating tank 5 after its degressive working by a wire drawing machine 4 via a descaler 2 and pretreating tank 3 from a feeding stand 1. The winding wire 8 removed from a stand 7a is set to a stationary heating furnace 9 and subjected to heat treatment under specific controlled atm. This heat treatment is performed under the atm. having the oxygen potentiality with the value of CuO oxygen dissociation pressure as the lower limit and 10<4> times said value as the upper limit. The wire 17 after heating is wound on a winding machine 16 via a finishing wire drawing machine 14 and straightening roller 15. A steel wire excellent in welding workability can thus be manufactured.
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