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Flo-Coat 50 Galvanized Steel Tubing
Flo-Coat 50 galvanized steel tubing is the product of choice for carports and other portable buildings. The unique, in-line Flo-Coat process provides a triple layer of corrosion protection that stands the test of time.
The process begins with flat strip steel, which is cold-formed and electric-resistance or induction welded. After welding, the tube goes through three coating baths. The first coating bath bonds zinc to the hot tubing, and is followed by a conversion coating. As the tub goes through the conversion coating bath, the process chemically changes the zinc already on the surface of the tube. The compounds which are formed make the zinc even less subject to corrosion than unprotected zinc. This conversion coating also provides another layer of protection for longer resistance to white rust corrosion. The excess solution is then removed from the tube and the tube is dried to prepare for its third and final protective coating bath... an application of a clear organic polymer to give the tube superior corrosion resistance, added aesthetic appeal, and long-lasting surface brightness. This coating is then cured to a smooth, hard finish near the end of the in-line process.
The result is a smooth, shiny end product appearance that is unmatched in terms of strength and durability - it will not oxidize or "gray down" with age, nor will the coating flake off during fabrication operations.
We guarantee a minimum 50,000 psi yield strength with our Flo-Coat 50. Our competition...pregalvanized tube products, i.e. G-60, G-90, G-120, etc., advertise only a "target" yield strength...not a guaranteed minimum yield strength.
The Flo-Coat manufacturing process not only protects the tubing, it also further strengthens it. The cold-forming, then heating and quick cooling of the tubing, enhances the mechanical properties - providing increased structural rigidity and greater impact resistance.
Corrosion Resistance Superiority
More than Double the Performance vs. Pregalvanized Tube Flo-Coat 50 tubing provides outstanding corrosion protection because of the synergism created between the three coatings. The conversion coating passivates the zinc to slow down the white rust growth, and the clear topcoat then "seals in" the protection.
Pregalvanized products do not provide this "sealed" protection. On the inside of Flo-Coat 50 tubing a corrosion-resistant zinc based coating is applied after the tube is welded, and completely covers the interior. When pregalvanized steel is formed and welded, the inside weld area is left bare - unprotected since the interior cannot be re-metalized. The exposed metal is immediately left to be attacked by all corrosive elements. The exterior of the weld is re-metalized, but is still far more susceptible to corrosion than Flo-Coat 50 tubing.
Welding, Fabricating and Coating Flo-Coat 50 Tubing
Flo-Coat products have several advantages over pregalvanized products when performing secondary operations:
Restoring Corrosion Resistance to Welds
When welding any galvanized tubing, it is important to restore the corrosion resistance of the weld zone to that of the surrounding tube area. This is easily accomplished by using Sonco's custom touch-up paint, which has been specifically designed for this purpose. Another method of restoring corrosion resistance is thermal spray. Thermal spray is a process by which zinc wire is continuously melted and projected by compressed air onto a prepared surface. If you would like more in-depth information on welding galvanized steel tubing, or the various methods of restoring corrosion resistance to weld areas, please contact us for a copy of the Welding and Painting Guidelines.
Contact one of our Sonco Tube professionals at 888-766-2613. We are standing by to provide additional information or to provide a free quotation for your next tubing project.
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