Hot Dipped Galvanized Steel (GI)

Hot-dip galvanized Steel or GI is produced by coating iron and steel with zinc, which alloys with the surface of the base metal when immersing the metal in a bath of molten zinc at a temperature of around 449 °C (840 °F). When exposed to the atmosphere, the pure zinc (Zn) reacts with oxygen (O2) to form zinc oxide (ZnO), which further reacts with carbon dioxide (CO2) to form zinc carbonate (ZnCO3), a usually dull grey, fairly strong material that protects the steel underneath from further corrosion in many circumstances.

Steel Rolls
Gi 2


GI comes in various surface finishes such as regular, minimized and zero spangle. The spangle patterns will vary from small to big depending on the amount of time allowed for the steel to cool down.

GI is commonly used for its properties of good corrosion resistance, weldability and formability.

Gi 3
Gi 4


  • Construction (Roofing, Purlins)
  • HVAC (Ducting)
  • Prestressed tensioning pipes
  • Consumer electrical products
  • Enclosures
  • Storage tanks


  • Steel Roll

    Common Stock


  • Measurement

    Corresponding Standard

    JAPAN - JIS G3302
    CHINA - GBT 2518
    U.S.A - ASTM A653-CQ
    EUROPE - EN 10142

  • Dimensions

    Applicable Nominal Thickness

    0.28MM - 3.00MM

  • Width

    Width Available

    50MM ~ 1524MM

  • Stack


    Click here for detailed specifications sheet

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