It is mainly used in construction, mining, chemical industry, welding mesh, welding hangers, reprocessing, etc. After annealing, the iron wire becomes soft, the flexibility increases, and the building binding wire is made, and the binding effect of steel bar is more.

Currently, annealing wire and steel wire production is widely used wire drawing process and galvanized treatment. 1976, Guangzhou galvanized iron wire the factory first applied new technologies such as electrolytic pickling, high-pressure flushing and card drying in China, and successfully tested nail drawing thread continuous production, making the wire drawing process change from intermittent production to continuous production, weakening labor intensity and reducing metal consumption. At that time, domestic wire factories had been able to produce wire ropes, spokes and wires, umbrella bone steel wire, spring steel wire, bicycle saddle spring steel wire and other products. In the 1980 s, hot-plated low-carbon steel wire, fan guard steel wire, carbon structural steel wire, bed surface steel wire and so on were also published one after another.

The packaging of black wire is the same as that of zinc plated wire. It is divided into inner plastic, outer linen, inner plastic and outer weaving. First, use a thin layer of plastic to wrap the wire in a circle, and then use hemp bag or woven bags to wrap it!