black wire

Black wire
tensile strength:40kg/mm2~55kg/mm2 
packing :10kg/coil,25kg/coil ,50kg/coil and so on;as customer's requirements

1. Material Q195

Black wire and other wire are manufactured by wire rod. 

The type of wire rod is Q195, element composition is as follows:

C≤0.07; S≤0.023; Si≤0.09; Mn≤0.32; P≤0.025.

This type is fit for drawing.

2. Drawing

Draw wire rod into thinner wire,then draw into all kinds of diameter. There are no loss of weight during drawing.

3. Annealing

Anneal is to low the tensile strength of wire. 

Different thickness of wire require different temperature.