Aluminized is carbon steel that has been hot dipped coated on both sides with an aluminum-silicon alloy. Through the hot dipped process, the steel has improved corrosion resistance and have a unique combination of both carbon steel and aluminum. There are two types of aluminized steel; type 1 contains 5%-11% silicon to promote better adhesion to the steel itself and is intended for applications such as mufflers, furnaces and water heaters. Type 2 is hot dipped coated with commercially pure aluminum and found in applications such as grain bins and drying ovens.
Cold Rolled Steel
Cold rolled steel isn’t actually “cold” as the name might suggest. Slabs are cooled to room temperature then rolled and processed into their final size/shape. With cold rolling, the material is cold worked (or work hardened) which increases the strength of steel and affords tighter tolerances for highly engineered applications. The material is then annealed to make the steel more formable. The cold rolling process is more visually appealing and appears shinier than traditional hot roll steel. Cold Rolled steel is found in a variety of products including sheet, flat roll, bars, and tube.
Cold rolled full hard steel is produced the same as your traditional cold rolled steel. Slabs are cooled to room temperature then rolled and processed. When complete, traditional cold rolled is then annealed to make the steel more formable. With full hard, the cold rolled produced is not annealed, making it highly work-hardened and often contains residual cold mill oils on the sheet surface. In sheet form, the product meets ASTM A568.
Galvalume steel is hot dipped carbon steel with an aluminum-zinc alloy coating that is 55% aluminum and 45% zinc and a small amount of silicon. Like galvanized steel, the galvalume coating is “sacrificial” – which means the galvalume coating the steel will corrode, thus protecting the base layer carbon steel. It gives steel a long-term resistance to atmospheric corrosion and retains a bright surface appearance even through long-term exposure to the elements. Galvalume is often found in metal roofing applications.
Galvanized steel is carbon steel that is hot-dipped and coated with zinc on both sides of the steel itself. Through hot dipping, the iron-zinc alloy forms a bond to prevent the carbon steel from rusting. Before hot dipping can occur, the surface prep to the steel is critical to ensure the zinc adheres properly and provides the necessary protection to the steel. The governing specifications of hot dip galvanizing are ASTM A123/A123M, A153/153M, A767 as well as CSA G164 and ISO 1461.
Hot Rolled P&O
The pickling process removes surface oxides from metals via a chemical reaction. Steel is placed into an acid bath that removes the scale jacket and leaves a clean surface for further process. This oil that is used to treat the surface of the steel helps to prevent corrosion during the shipping and storage. The pickling process helps to remove impurities such as stains, inorganic contaminates and scale.
Pre-painted steel products are carbon sheet steel that is produced with a direct application of paint onto the steel a coating line. Before the material can be painted, it is primed to ensure the paint properly adheres to the steel itself. Painted products help to improve the corrosion resistance of steel, and adds the beauty of crisp, painted exterior that is pleasing in appearance. Today’s painted coils are computer controlled to ensure paint thicknesses are uniform and a high quality.