Process: 

The hot metal billet rolled into 6.5mm thick steel bar rod is then put into the drawing device to pull within a different diameter line, and gradually narrow the aperture plate drawing, cooling, annealing, Tudu processing technology into a variety of different specifications of wire. Component it contains are: iron, cobalt, nickel, copper, carbon, zinc, as well as other elements. 

Features:

black iron wire has good elasticity and flexibility, can be controlled during annealing its soft and hard, made of high quality iron wire, mainly used in construction as binding wire and tie lines. There are silk No. 5 # -38 # (wire by 0.17-4.5mm) 

Qualities:

softer than ordinary black wire, greater flexibility, softness uniform, consistent color.