All About Aluminized Steel

By December 19, 2017News, Your Advantage

In one of my recent articles, I wrote on the topic of “Aluminum vs. Steel”. Each has their ideal applications, and each has their unique positives and negatives. What if you could combine the two and get the best of both? You can…

“Aluminized” steel is hot dip-coated (like galvanized) on both sides, but the coating content is quite different. Unlike hot dip galvanized (HDG) which has a coating of 99+% zinc, an aluminized coating is comprised of 90+% aluminum. The exact aluminum % depends on the type, of which there are two:

Type 1 in addition to aluminum, contains between 5% to 11% silicon.  This grade used where heat resistance is required. Common applications are dryer ducts, baking pans, ovens, ranges, grills, furnaces, heaters, fireplaces, and mufflers.

Type 2 uses pure aluminum as its coating, and the coating is often thicker than that which is used in Type 1. End-uses include industrial cladding and jacketing over insulation, pipes that carry corrosive materials with steam or acids, storage tanks, grain bins, rooftop HVAC, corrugated roofing and siding, grain bins, drying ovens, and air-conditioner condenser housings.  For any finished product that needs a thick, protective, coating Type 2 is the best option.

It has the strength and durability of steel (same steel substrate as galvanized), as well as the surface qualities of aluminum (corrosion resistance foremost among them), and is more economical than metals like stainless steel. Aluminized is also less likely to deform under heat than stainless. Aluminized standards are in ASTM A463.

As discussed previously, in the late 1800s scientists discovered how to separate aluminum from other minerals and produce it on an industrial scale. Lighter than steel, it came to be used in everything from bats to pop cans, and eventually the aluminization process was perfected.

Mill sources for aluminized are limited. Fortunately for our customers, Pacesetter has the mill connections and the expertise to supply this unique material.

Aluminum and steel, two great materials that often compete in the marketplace, can also go great together.