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Hot Dipped Galvanized Steel Coils from China Suppliers - Quality Products from a Trusted Factory
Description
Hot Dip Galvanized Steel Coil is produced by passing Cold Rolled Steel Coil through a Molten bath of Zinc at temperatures of around 460 degrees Celsius. The Zinc coating on the steel coil substrate acts as a barrier between the atmosphere and the surface of the metal. Further due to it’s lower chemical potential as compared to Iron(Fe), it is attacked and dissolved first, thereby offering superior corrosion resistance (cathodic protection).
ASTM A 653/A 653M is a standard specification for hot-dip galvanized steel coils. It sets the requirements for the composition and quality of the zinc coating to ensure consistent performance and durability.
The Zinc Coating Mass Range of SISCO steel is between 40 gsm – 360 gsm (grams per square meter of sheet metal). The Surface Finish & Visual Appearance of the Zinc coating of Gi Coils can be:
Regular Spangle
Minimized or Minimal Spangle
Zero Spangle (Extra Smooth)
Zinc Coated Steel Coil/Sheet (Galvanized Steel Coil)
| Application | Building Roofing/Window, Automobiles, Color Coated Base Sheet etc. |
| Standard |
ASTM A653/A653M: American standard for cold rolled hot dip galvanized steel materials. JIS G 3302: Japanese material standard associated with hot dipped galvanized steel coils. BS EN 10346:2009 (Supersedes BS EN 10327:2004 & BS EN 10326:2004): European material standard for Continuously hot-dip coated steel flat products. |
| Grade | DX51D, DX52D, DX53D, DX54D, S220GD, S250GD...S550GD |
| Surface | Oiled, Chromated, Dry + Chromated, Anti-Finger |
| Zinc coat Weight (g/m²) | 40-350 |
| Internal Dia. | 508/610mm |
| Coil Weight | 3-7 Tons |
| Size | Thickness: 0.1-1.5mm Width: 600-1500mm |
Production process
Frequently Asked Questions (FAQ)
What is Hot Dip Galvanized Steel Coil?
Hot Dip Galvanized Steel Coil is produced by passing Cold Rolled Steel Coil through a molten zinc bath at approximately 460 degrees Celsius. This process applies a protective zinc coating to the steel substrate.
How does the zinc coating protect galvanized steel?
The zinc coating acts as a physical barrier against the atmosphere. Furthermore, because zinc has a lower chemical potential than iron, it acts as a sacrificial anode (cathodic protection), corroding first to protect the underlying steel.
What are the standard specifications for these coils?
The coils comply with major international standards including ASTM A653/A653M (American), JIS G 3302 (Japanese), and BS EN 10346:2009 (European) for continuously hot-dip coated steel flat products.
What types of surface finishes are available?
The surface finish and visual appearance of the zinc coating can be supplied as Regular Spangle, Minimized or Minimal Spangle, or Zero Spangle (Extra Smooth).
What are the typical applications for galvanized steel coils?
They are widely used in building roofing and windows, automotive manufacturing, and as the base sheet metal for color-coated steel products.
What sizes and grades do you offer?
We offer thicknesses ranging from 0.1mm to 1.5mm and widths from 600mm to 1500mm. Available grades include commercial and drawing grades like DX51D to DX54D, as well as structural grades from S220GD up to S550GD.