SNOW MELTING WIRE AND PRODUCTION THEREOF

摘要

PROBLEM TO BE SOLVED: To prevent electrolytic corrosion by composing a magnetic wire of specified components and coating the surface with specified thickness of Al, Al alloy, Zn or Zn alloy, thereby reducing the winding amount of magnetic wire. SOLUTION: A magnetic wire 6 wound spirally around an overhead wire 5 contains 0.1-0.9wt.% of Al, 0.1-0.9wt.% of Si, less than 0.02wt.% of C, less than 0.01wt.% of O and the remainder of Fe and inevitable impurities and coated with 10-120μm of Al, Al alloy, Zn or Zn alloy. When any one of C or O exceeds a limit value, flux density decreases and sufficient snow melting effect can not be expected. When Al is less than 0.1wt.%, O can not be removed sufficiently and when Al exceeds 0.9wt.%, flux density decreases to cause reduction of heat generation and sufficient snow melting effect can not be expected. When Si is less than 0.1wt.%, sufficient snow melting effect can not be expected and when Si exceeds 0.9wt.%, the wire is overheated. When the thickness of coating is less than 10μm, electrolytic corrosion effect can not be expected and when it exceeds 120μm, heat generation is decreased. This structure reduces the winding amount of magnetic wire and prevents electrolytic corrosion.