Heat exchange method, heat exchange medium and heat exchange device, as well as patenting method and carbon steel wire

摘要

The present invention provides a new heat exchange medium to replace lead. Liquid phase Mg- of a carbon steel wire (1A) heated in a heating furnace (11) melted with an Mg-Al-Ca alloy containing Mg (magnesium), Al (aluminum) and Ca (calcium) as main constituent elements. The Al—Ca alloy (20) is passed through a bath (12A) containing it. As it passes through the bath (12A), the carbon steel wire (1A) heated to, for example, about 950 ° C. in the heating furnace (11) is cooled to about 550 ° C. The Mg-Al-Ca alloy is non-toxic and has no environmental impact.