Product List

Galvanized Coil and Sheet Steel

Galvanized sheet or coil is defined as a carbon steel sheet coated with zinc on both sides. Continuous hot dipping, or electro-galvanizing are the two processes used to produce galvanized sheet and coil.

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Cold Rolled Coil and Sheet Steel

Cold Rolled Steel is a mill product made with a high degree of gauge accuracy and uniformity of physical characteristics.

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Galvannealed Coil and Sheet Steel

• Excellent paintability

• Easily welded

• Uniform matte (dull) finish

Galvannealed Sheet is carbon steel sheet coated with zinc on both sides by the continuous hot-dip process. Immediately as the strip exits the coating bath, the molten zinc coating is subjected to an in-line heat treatment that converts the entire coating to a zinc-iron alloy. (The iron diffuses from the steel into the coating.) The galvannealed surface has a non-spangled matte finish, a finish very different than the highly metallic appearance of the galvanized coating. At times, the galvannealed coating may appear similar to uncoated cold rolled steel. One of the primary attributes of the galvannealed coating is that the surface accepts paint very readily. It can be painted without the application of a pretreatment, although a pretreatment will enhance the performance after painting.

The zinc-iron alloy coating on galvannealed product behaves very differently than the soft galvanized coating. During fabrication, there is almost always some degree of powdering of the coating. Heavier coatings will exhibit more powdering. For this reason, typical galvannealed coatings are thinner than most galvanized coatings. Since galvannealed product is intended to be painted, a thinner coating can be successfully applied to provide long product life.

As stated previously, galvannealed sheet is specifically designed to be used in the painted condition and can be readily postpainted, i.e., painted after fabrication of a part. It is not intended to be prepainted, i.e., painted in coil form and then formed into a shape. The brittle nature of the coating makes forming after painting a difficult task to avoid degradation of the corrosion performance in subsequent service.

The excellent corrosion resistance that results when the alloyed coating is painted is useful in many applications that demand long service life. For example, painted galvannealed sheet provides excellent service when used on automobiles for both exposed and unexposed applications. It is also specified for buses, trucks and other vehicles where long life is important, garage doors, highway signs, computer chassis, and vending machines - as well as any other applications that require good resistance to undercutting corrosion of the coating. Galvannealed sheet offers a combination of good paintability, easy weldability and galvanic protection.

"Paint Grip" (Bonderized or Phosphatized)

• Ready for immediate painting

• Dull gray appearance

• Improves life expectancy of the paint applied to it

Bonderized steel is simply galvanized steel which, in the process of manufacture, is put through a phosphate bath and chromate dry. This produces the dull grey color characteristic of Bonderized which provides an excellent "primer" for painting applications. Please note, bonderized material should be immediately painted after installation as the exposed phosphate coating is prone to white rust.

In a continuous, controlled process, coils of galvanized steel are first thoroughly cleaned and rinsed. A conditioning agent is then applied to promote the formation of a fine crystalline zinc phosphate coating. This process then converts the bare galvanized surface to an inert, crystalline zinc phosphate which is subsequently rinsed and sealed with a dried-in-place chromate conversion coating. This entire process creates what is called a Bonderized surface. 

A long time favorite of the rainwater goods industry, zinc phosphate provides the perfect surface for field painting of flashing, gutters, downspouts, and other roofing materials, as well as signs and even enamel coated interior fixtures.

Electro-galvanized

• Uniform distribution of extremely thin zinc coating

• Spangle free

• Welds easily

• Good paintability

Electrogalvanized sheet is manufactured by electroplating a pure zinc coating on one or two sides of carbon steel sheet. This continuous electrolytic coating process can be used to apply the coating onto the surface of the steel sheet with an exceptionally uniform thickness.  In addition, the coated sheet has a smooth, matte appearance similar to cold rolled sheet.  Thus, the surface quality is exceptionally good for applications that require a high finish after painting, such as automotive exposed  panels. The excellent control of the coating thickness that is achieved with the electrolytic deposition process is beneficial to enhance forming and joining operations, especially by contributing to more reliable results from automatic and robotic welding systems. Both the zinc and zinc-iron electrogalvanized coatings are readily paintable, but to achieve good resistance to corrosion, the coated-steel surface should be pretreated and primed prior  to application of the finish paint coating.

The mechanical properties of electrogalvanized sheet are approximately the same as those for the equivalent grade (steel designation) of cold rolled sheet because the steel coils are pre-annealed prior to processing on the electroplating line. For example, DDS cold rolled sheet and DDS electrogalvanized sheet have similar mechanical properties. This does not mean that electrogalvanized product will behave similarly during stamping/drawing.The coating influences the behavior during forming; thus, special practices are required when stamping electrogalvanized products. With the correct type of die material, clearances, etc., the stamping performance of the two products are similar.

Hot Rolled Pickled and Oiled (HRP&O)

• "Pickled" to remove scale

• Oiled to guard against rust

Hot rolled steel is generally used in parts where rust proofing is not critical. There are processes that allow hot rolled sheets to prevent rust as well. This process is called HRP&O - Hot rolled pickled and oiled. Pickling and oiling improves hot-rolled durability and workablility at a low cost. It provides a cleaner surface hot rolled product suitable for painting with a limited barrier to rust formation. It is an all purpose steel product used for roll-formed shapes, pipe, tubing, industrial storage racks, automotive and other stampings, air compressor housings, filter housings, agricultural equipment, package strapping, and much more.

Whatever product you are looking for, our team of dedicated, service and quality oriented steel experts are waiting to help fill your needs, just like we’ve been doing since 1976!