Steel Material Thickness Material thickness of steel is referred to as Gauge (GA). Gauge is the two digit number that relates to the thickness of the steel sheet in decimal inches. The larger the Gauge number, the thinner the sheet. Example Tolerances: 26 Gauge = .016” to .020” 24 Gauge = .021” to .027” 22 Gauge = .027” to .033”
Steel Material Thickness Material thickness of steel is referred to as Gauge (GA). Gauge is the two digit number that relates to the thickness of the steel sheet in decimal inches. The larger the Gauge number, the thinner the sheet. Purchased Thickness: 26 Gauge = .018” 24 Gauge = .023” 22 Gauge = .0296”
Hot Dipped Galvanized Defined: Galvanized is 100% melted Zinc applied to steel coil. “G” stands for Galvanized and last digits stand for the amount of Zinc that is applied to both sides of the steel coil. Example: G-90 is 0.90 ounces of Zinc per square foot, total both sides.
Galvalume Defined: Galvalume is a combination of 20% melted Zinc and 80% Aluminum that is applied to the steel coil. “AZ” stands for Aluminum and Zinc. The last two digits stand for the coating weight of both sides in ounces per square foot. Examples: AZ55 is 0.55 oz./sq.ft. (Bare ACG) AZ50 is 0.50 oz./sq.ft. (To Be Painted)
Aluminum/Zinc Coated Carbon steel sheet that meets ASTM A792-96.
By volume consists of a minimum thickness of .50 oz per Sq Ft of AL/Zn for both sides of the steel sheet.
20 year 6 month warranty against substrate corrosion
Galvalume vs. Galvanized Acrylic Coated Galvalume Galvanized
Galvalume vs. Galvanized Moderate Marine / Rural Hot Dipped Galvanized After 18 years, G-90 Galvanized exhibits red rust Galvalume Galvalume after 23 years – No major sign of red rust.
Galvalume vs. Galvanized Salt Spray Corrosion Resistance With cut edges protected, the coating on Galvalume AZ50 lasts 5 to 10 times longer than the coating on G90 Hot Dipped Galvanized. Salt spray tests conducted with bare cut edges exposed, the corrosion resistance of Galvalume AZ50 is typically three to four times that of G90 HD Galvanized.
Galvalume vs. Galvanized Salt Spray test concerning the amount of hours to first significant rust Total # of Hours
Galvalume vs. Galvanized Corrosion Losses of Substrates H. D. Galvanized Galvanized 0.8 0 0.2 0.4 0.6 1 Corrosion Loss (Mils)
Dissimilar Metals Direct contact of steel to these metals will cause corrosion damage and deterioration of the steel. Even water run off from these metal will cause corrosion of the steel. Copper Iron Graphite Lead
3003,3004 alloy corrosion resistance and formability are excellent.
3105 alloy is an essentially 98% pure aluminum
5052 alloy is excellent and in the annealed condition it offers higher strengths than 3003/3004/3105 alloys.
Aluminum The International Alloy Designation System is the most widely accepted naming scheme for wrought alloys. Each alloy is given a four-digit number, where the first digit indicates the major alloying elements.