Black annealed wire

Before the big pull, there will be a surface treatment: Pickling----Washing----Phosphide-----Soaping----Drying. The treatment function is rust removing, Phosphide  and soaping are good for next pulling proess.

Row material

Low carbon steel wire , Q195 or Q235

Advantages  

Soften and flexible character 
Low costs and economy 
Easy to handle or install

Tensile strength :300-500Mpa  

Rate of Extend :15%