Selecting the correct material is critical for structural integrity. For standard indoor construction, Q235 or Q345 carbon steel is the industry standard due to its balance of strength and cost-effectiveness. However, for coastal or high-humidity environments, you must specify Hot-Dip Galvanized (HDG) coatings with a thickness of at least 85 microns to prevent corrosion. For chemical plants or marine applications, Stainless Steel 304 or 316 is required to ensure a service life exceeding 25 years.