| 摘要 |
PURPOSE:To produce a Zn-plated steel wire which has excellent high temp. characteristics and can prevent the exfoliation of the plating surely in high-temp. environment by controlling the lead contained in a Zn plating bath to a specific amt. or below and plating the steel wire in said plating bath. CONSTITUTION:A hot-rolled wire rod is subjected to lead patenting then to pickling and lubricating followed by drawing. The drawn wire rod is further subjected to a pretreatment for plating to dip the same in a lead bath, whereafter the wire rod is galvanized. If the Pb contained in the Zn plating bath is controlled to <=150ppm, the Zn-plated steel wire having excellent high temp. characteristics is obtained. Since the Zn-plating layer contains virtually no Pb, Fe and Zn are alloyed thoroughly in the high-temp. environment and are bound securely in one body with the base material Fe without peeling, whereby such Zn-plated steel wire having the excellent high temp. characteristic is obtained. Said Zn-plated steel wire is suitable as a steel cored wire for an overhead wire which is elevated in temp. during transmission of electricity. |
