Steel wire is one of the four major varieties of steel: plate, tube, profile and wire. It is a reprocessed product made of hot-rolled wire rod by cold drawing. According to the section shape, it mainly includes circle, square, moment, triangle, ellipse, flat, trapezoid, zigzag, etc. Ordinary quality steel wire includes steel wire for welding rod, nail making, mesh making, packaging and printing industry, steel wire for cold heading forging for cold heading rivet and screw, etc., and electrical steel includes special steel wire for production of overhead communication line, steel cored aluminum strand, etc.