Black iron wire has good elasticity and flexibility, and its softness and hardness can be controlled during annealing. It is made of high-quality iron wire and is mainly used in the construction industry as binding wire and wire.
Process: Rolling hot metal billets into 6.5mm thick steel bars, also known as wire rods, and then placing them into a drawing device to draw wires of different diameters. Gradually reducing the diameter of the drawing disc, cooling, annealing, coating and other processing techniques are used to produce various specifications of iron wires. It contains components such as iron, cobalt, nickel, copper, carbon, zinc, and other elements.
| wire gauge size | SWG(mm) | BWG(mm) | metric(mm) |
| 8 | 4.06 | 4.19 | 1.00 |
| 9 | 3.66 | 3.76 | - |
| 10 | 3.25 | 3.40 | 3.50 |
| 11 | 2.95 | 3.05 | 3.00 |
| 12 | 2.64 | 2.77 | 2.80 |
| 13 | 2.34 | 2.41 | 2.50 |
| 14 | 2.03 | 2.11 | - |
| 15 | 1.83 | 1.83 | 1.80 |
| 16 | 1.63 | 1.65 | 1.65 |
| 17 | 1.42 | 1.47 | 1.40 |
| 18 | 1.22 | 1.25 | 1.20 |
| 19 | 1.02 | 1.07 | 1.00 |
| 20 | 0.91 | 0.89 | 0.90 |
| 21 | 0.81 | 0.813 | 0.80 |
| 22 | 0.71 | 0.711 | 0.70 |
| Wire gauge number | wire diameter（mm) | Load bearing reference(per bundle) |
| 9 | 3.658 | 100-1000kg |
| 10 | 3.251 | 100-1000kg |
| 11 | 2.946 | 100-1000kg |
| 12 | 2.642 | 100-1000kg |
| 13 | 2.337 | 100-1000kg |
| 14 | 2.032 | 100-1000kg |
| 15 | 1.829 | 50-100kg |
| 16 | 1.626 | 50-100kg |
| 17 | 1.422 | 50-100kg |
| 18 | 1.219 | 50-100kg |
| 19 | 1.016 | 50-100kg |
| 20 | 0.914 | 50-100kg |
| 21 | 0.813 | 50-100kg |
| 22 | 0.711 | 50-100kg |
| 23 | 0.610 | 50-100kg |
| 24 | 0.559 | 50-100kg |
| 25 | 0.508 | 50-100kg |
Black iron wire is mainly produced and processed from Q195 material, and its main chemical composition and mechanical characteristics are as follows:
| The name of a shop | grade | Chemical composition (mass fraction) (%) |
|
|
|
|
| C | Mn | Si | S | P |
|
|
| ≤ |
|
|
|
|
|
|
| Q195 | - | 0.06~0.12 | 0.25~0.50 | 0.30 | 0.050 | 0.045 |
Q195 Mechanical properties
| The name of a shop | tensile strength(Mpa) | Yield point(Mpa) | Elongation(%) |
| Q195 | 315-430 | 195 | 33 |
