Galvanized Steel Sheet & Coil

Galvanized Steel Sheet & Coil Supplier

Curtis Steel is a leading supplier of galvanized steel sheets & coils. Galvanized steel is defined as a carbon steel sheet coated with zinc on both sides. There are two main processes used to produce galvanized steel: continuous hot dipping and electro-galvanizing. 

Hot Dipped Galvanized Steel 

The hot dipping process consists of passing the steel through a bath of molten zinc, while the electro-galvanizing process consists of the application of zinc through electrolytic disposition. The result is a layer of zinc tightly adhering to the base metal through an iron-zinc bonding layer. Our hot-dipped galvanized products are manufactured to ASTM A653 specifications; our electro-galvanized products conform to ASTM A879 specifications. 

galvanized steel sheet ASTM A-653

A zinc coating is one of the most effective and economical methods of protecting bare steel from a corroding environment. The zinc not only serves as a barrier between the steel and the environment, but it will also sacrifice itself to protect the underlying steel sheet. Sacrificial or galvanic protection occurs when two dissimilar metals are in contact and coupled with water and oxygen. Zinc corrodes preferentially to the iron in steel. This protection prevents corrosion of the steel in areas not covered with zinc. Thus, the spread of corrosion from cut edges, drill holes, etc. is minimized.

Material Types

  • Commercial Steel (CS Types A, B, and C)
  • Forming Steel (FS Types A and B)
  • Deep Drawing Steel (DDS Types A and C)
  • Extra Deep Drawing Steel (EDDS)
  • Structural Steel (SS) – further designated by Grades (33,37,40,50,80)
  • High Strength Low Alloy Steel (HSLAS)


Galvanized Coil & Sheet Steel Stock Sizes

Galvanized Coils

36” 16 - 28
48” 16 - 28
60” 16 - 26

Size Chart

Product-Coated: Hot Dipped Galvanized | ASTM A-653 | Grade: CS-B | Surface:Min Spangle | Treatment: CT-DryG6028GA (.0217 MAX - .0157 MIN)364860G3030GA (.0187 MAX - .0127 MIN)3648***

G90 10GA (.1472 MAX - .1292 MIN) *** 48 60
  11GA (.1323 MAX - .1143 Min) *** 48 60
  12GA (.1174 MAX - .0994 MIN) *** 48 60
  13GA (.1014 MAX - .0854 MIN) *** 48 60
  14GA (.0865 MAX - .0705 MIN) 36 48 60
  16GA (.0696 MAX - .0575 MIN) 36 48 60
  18GA (.0566 MAX - .0466 MIN) 36 48 60
  20GA (.0506 MAX - .0356 MIN) 36 48 60
  22GA (.0436 MAX - .0296 MIN) 36 48 60
  24GA (.0316 MAX - .0236 MIN) 36 48 60
  26GA (.0247 MAX - .0187 MIN) 36 48 60


Large Volume Steel Specs, Sizes, and Sheets

  • The galvanized coil is used to create square ductwork and comes in 60" wide coils with a 10,000-pound weight limit. 
  • Galvanized stock sheet sizes are available in 4x10 and 5x10 gauge thicknesses including 16/18/26 gauge thickness. 
  • 5.394 slit coils available for spiral pipe ductwork.
  • Hot Dipped Galvanized is offered in a variety of coating weights including G-90, G-60, G-40, and G-30.
  • Galvannealed products are offered in A-60 and A-40 coatings.


large volume steel supplier


Large Volume Steel Products Ready to Ship


Galvanized Steel - 10-30 GaugeGalvannealed Steel - 12-26 Gauge
Hot Rolled Pickled & Oiled (HRP&O) - 1/4"-14 Gauge
ASTM A-653 G30-G90
ASTM A-653, A60
ASTM A-36, A-1011, A-1018
Galvanized material is hot-dipped and coated with a durable protective layer of zinc to prevent corrosion. Most gages are offered with a G90 coating, while others range from G30 to G90.
Galvannealed steel is very similar to galvanized, but with differences in the coating process that result in a product much more suitable for painting. Both Galvannealed and Bonderized are commonly referred to as "Paint Grip".
Hot rolled pickled and oiled is a rolled steel that has gone through a pickling process. This created an enhanced surface finish by removing any oxidized iron and applying oil to the surface to prevent rusting. 

Additional large-volume steel products available to ship include cold rolled, bonderized, stainless steel, and galvalume

Master Coils are 36", 48", and 60" wide. Custom widths and lengths for coils and sheets are available. 

Custom-sized cuts require a 2,000lb minimum. 

Coating Weights

Additionally, the Hot Dipped Galvanized and the Galvannealed products are available in a variety of coating weights including G-90, G-60, G-40, and G-30 for the Hot Dipped Galvanized products, and A-60 and A-40 for the Galvannealed products.


At Curtis Steel, we also offer two different finishes on our 26 & 28-gauge galvanized steel sheet & coils.

Regular Spangle                                    

spangle galvanized steel sheet ASTM A-653    
  Min. Spangle
min spangle galvanized steel sheet ASTM A-653

As the primary supplier of galvanized sheets and coils to over 1500 customers for over 30 years, just let us know the end use of your product and we can help you find the material that is right for you. Call us at 1-800-749-4621 or contact us online and get a quote today!

Typical Galvanized Steel Sheets & Coil Applications:

  • Exterior building products
  • Ductwork
  • HVAC products
  • Flashing
  • Electrical boxes and other electrical products
  • Roofing
  • Doors
  • Sashes
  • Automotive parts
  • Appliances
  • Commercial and residential steel framing
  • Parking lots
  • Truss plates
  • Metal building purlins
  • Any other products requiring a corrosion-resistant material