Structural steel essentially consists of a combination of ferrite, pearlite and cementite, subjected to heat treatment that generates an alloy of iron [generally more than 97%] and carbon [in a maximum proportion of 2%], with the common addition of small amounts of auxiliary components, such as silica, chromium, manganese, sulfur and nickel. Carbon is the component that confers the greatest effects on the properties of the structural material resulting from the manufacturing process, so that the hardness and resistance are greater the greater the proportion of carbon in the alloy, but, at the same time, excessive amounts of This causes failure and weldability problems. Therefore, the addition of small amounts of carbon guarantees the achievement of a resistant and ductile steel, but at the same time with a greater probability of breakage and weldability. Having said the above, the attributes of steel are evident in its fusibility, forgeability, malleability, ductility, toughness and weldability; The sum of all of them makes it a material with undoubted application in porticoed and spatial structures.