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China Hot Dipped Galvanized Steel Coil (HDGI) Suppliers - Durable and Cost-Effective Factory Solutions
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 its 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 This is the American standard for cold rolled hot dip galvanized steel materials. JIS G 3302 This is the Japanese material standard associated with hot dipped galvanized steel coils. BS EN 10346:2009 (Supersedes BS EN 10327:2004 & BS EN 10326:2004) This is the 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
How is Hot Dip Galvanized Steel Coil produced?
It is manufactured by passing cold rolled steel coils through a molten bath of zinc at temperatures of approximately 460 degrees Celsius, forming a protective barrier coating.
What standard specifications do your galvanized steel coils meet?
Our products conform to major international standards including ASTM A653/A653M (American), JIS G 3302 (Japanese), and BS EN 10346:2009 (European).
What surface finishes are available for GI coils?
We offer multiple surface finishes including Regular Spangle, Minimized or Minimal Spangle, and Zero Spangle (Extra Smooth).
What is the range of zinc coating weight and thickness?
The zinc coating weight ranges from 40 to 350 g/m² (up to 360 gsm for SISCO steel), with thickness capabilities ranging from 0.1mm to 1.5mm.
What are the primary applications of galvanized steel coils?
They are widely used in building roofing, window frames, automotive manufacturing, and as base sheets for color coating.