Hot-Dipped Galvanized (GI)

Hot-Dipped Galvanized Steel (GI) is made from hot or cold-rolled steel that is coated with zinc by the hot-dip process which deposits a layer of Zinc onto the surface by passing the strip through a molten bath of zinc.

As the strip exists in the molten bath of zinc, air knives are used to remove the excess zinc to achieve the desired coating weight.

The zinc coating prevents corrosive substances from reaching the underlying metal. Any steel product that requires protection from corrosive substances in the environment from reaching the underlying steel is a good candidate for hot-dipped galvanized material.

Galvanized steel is designated with a “G” (G40, G60, G90). The number is the weight of the coating in ounces per square foot. G60, for example, is 0.60 ounces per square foot. (Which adds an ‘average’ thickness of about 0.0005 inches to the steel.).

Gauge (thickness)

  • Min. gauge: .012”
  • Max gauge: .120”


  • Min. width: 1”
  • Max width: 72”

Coating Weight

  • G30, G40, G60, G90
  • Please inquire for additional coating weights

Surface Finish

  • Min. spangle and/or extra smooth, regular spangle
  • Temper rolling for consistent surface appearance


  • ASTM A653: CS (Commercial Steel) Type A, B, or C; FS (Forming Steel) Type A or B; Deep Drawing Steel (DDS), Extra Deep Drawing Steel (EDDS)
  • SAE J403: C1004-C1009, C1010-C1022
  • Structural Steel: SS Grade 33, 37, 40, 50, 55, 60, 80
  • Bake Hard: BH180 – 300
  • High Strength: HSLA Grade 40 (280 MPa), HSLA Grade 50 (345 MPa), HSLA Grade 60 (410 MPa)

Surface Treatment

  • Oil: Provides temporary corrosion protection and lubrication for forming operations
  • Chemical treated (hexavalent chromium): Provides a barrier for corrosion protection
  • Chemical treated (RoHS-compliant trivalent chromium): Provides a barrier for corrosion protection and complies with newer environmental standards requiring trivalent chromium
  • Non-Chemical Treat: No product is added for corrosion protection after zinc coating

Temper Rolled

  • For fluting sensitive applications
  • Available on non-IF steels for a coil-break-free surface
  • Not available for HSLA steels
  • Not required for IF steel, as coil breaks will not occur


  • HVAC Products
  • Steel Doors
  • Ducts & Accessories
  • Grain Bins
  • Commercial and residential steel framing
  • Flashings
  • Metal Roofing
  • Steel Containers
  • Appliance parts
  • Steel Decking
  • Metal Stampings
  • Electrical boxes
  • Stock Tanks
  • Truss plates
  • Metal building purlins
  • Garage Door Hardware

Hot-Dipped Galvanized (HDG)

Hot-Dipped Galvanized (HDG)

Hot-Dipped Galvanized (HDG)

Hot-Dipped Galvanized (HDG)

Hot-Dipped Galvanized (HDG)