Material Information

The following information is provided in order to help you select the best type of metal for your application.

Carbon Steel is the most corrosive and therefore the least expensive of the metal types. Because carbon steel is susceptible to corrosion, it is best when used in unexposed applications or protected with paint or powder coating.

Galvanized Steel is essentially carbon steel with a corrosion resistant zinc coating applied to it during production. Once applied, the zinc takes on a flak-like finish or "spangle". Although known for its unique look and corrosion resistant properties, Galvanized Steel may rust if the carbon core is exposed.

Stainless Steel, unlike carbon or galvanized steel, contains chromium and nickel which create an invisible protective film that protects the metal making it 100% corrosion resistant. There are several types of Stainless Steel, but 304 and 316 are two of the most popular types because of their ability to be hardened by cold working. 304 is the most widely used because it possesses an excellent combination of strength and corrosion resistance and because it fabricates well. 316 offers superior corrosion resistance compared to other 300 series alloys which makes it ideal for use in harsh corrosive environments (ex. sea water, chemicals, etc.).

Aluminum, like Stainless Steel, is corrosion resistant. It is, however, much lighter and softer than Stainless and Carbon Steel which makes is ideal for applications where weight is an issue. It is, however, prone to scratching. To help prevent scratching and the dull appearance that results from the natural oxidation of the outer layer, Aluminum can be either clear or color anodized. Unlike paint or powder coating, anodize film is built from the aluminum itself and takes on a translucent appearance.

There are several types of Aluminum, but 3003 and 5052 are two of the most popular types because of their overall good characteristics. 3003 is the most widely used general-purpose alloy because of its good corrosion resistance, moderate strength, formability, and weldability. This alloy may show some slight discoloration when anodized, but reacts well to being painted or powder coated. 5052 is a versatile high-strength alloy with good forming characteristics and excellent corrosion resistance. Although easily welded, it is not recommended for brazing and soldering applications. Anodized coatings may take on a yellowish tint if applied too thick.