General steel has various types depending on the end-use and environment of it. It has been often repeated that the environmental conditions and the functions of the product should be considered so the appropriate type and grade of steel is provided.
In construction, which general steel to be considered will not only depend on the environment, it is also imperative that the design of the building or structure is scrutinize as it also plays a part in the level of corrosion risk the structure or building is exposed to.
Here are some of the types of structural design that will increase the risk of corrosion:
Finish Grain. The finish orientation becomes a significant factor when there is an obvious grain line like emboss and other like finishes. A vertical orientation of the finish grain will just allow rain and contaminants to flow through and drain away. A horizontal orientation of the finish grain will increase the risk of the steel retaining contaminants.
Horizontal or Sheltered Surfaces. Corrosive substances tend to accumulate on horizontal surfaces or sheltered components in a structure mainly because rain might not be able to remove those contaminants. If those contaminants are left for a long time on the surface, it can increase the risk of corrosion staining. In these parts of the structure, a more corrosion resistant steel should be used.
Crevices. Dirt, water, contaminants and corrosive substances can get trapped in crevices and narrow gaps of the structure. When designing, it is best narrow gaps or crevices are avoided or sealing them off. If crevices are really in the design, then a grade of general or stainless steel with better corrosion resistance should be used.