material mm
black sheet of metal 1,2; 1,5; 1,8; 2
galvanized steel 1,2; 1,5; 1,8; 2
hot galvanized steel 1,35; 1,65; 1,85; 2

Metal poles

Black steel
This alloy is produced from steel and other elements such as copper, chrome, phosphorus, nickel, sulfur, magnesium and silicon, which is currently widely spread because of its characteristics :
- corrosion resistance
- tension resistance
The black steel, exposed to the environment, is coated with a layer of oxides of the elements of the alloy, thereby avoiding the spread of corrosion.
This protective layer is brown and changes its hue over time. The advantages of steel can be described briefly as follows :
- reduced costs for the same level of mechanical resistance due to the use of minimum thickness and less weight.