Hot-Dip Galvanized Steel Coil (GI) – Z40-Z275 Coating, 0.15-6.0mm Thick, Ideal for PPGI Substrate & Construction Components
Product Overview
This is the uncoated (bare) galvanized steel coil – the foundational material used to produce Prepainted Galvanized Steel (PPGI). Produced by immersing cold-rolled steel into a molten zinc bath (continuous hot-dip process), the GI coil develops a robust zinc-iron alloy layer that provides excellent corrosion resistance even before painting. With a wide thickness range and multiple spangle options, this bare coil serves as the direct substrate for PPGI manufacturing, as well as a standalone material for galvanized corrugated sheets, gutters, and structural components where a painted finish is not required.
Specification Spotlight: Zinc Coating Weight
We supply Z40 to Z275 g/m² (double-sided) to meet diverse environmental requirements:
Z40 (factory standard, ~25-30g actual) – Economical option for indoor or mild environments.
Z80-Z120 – Recommended for standard exterior building components.
Z275 – Premium coating for high-corrosion zones (coastal/industrial).
Key Specifications
| Parameter | Range / Options |
|---|---|
| Base Metal | Cold-rolled steel (CR) |
| Coating Type | Pure zinc (hot-dip galvanized) |
| Coating Weight | Z40 – Z600 g/m² (double-sided) |
| Thickness | 0.15 mm – 6.0 mm |
| Width | 5 mm – 1600 mm (standard slitting available) |
| Spangle Types | Regular spangle (large), Minimized spangle (small), Zero spangle (spangle-free) |
| Surface Treatment | Chromate passivation, Anti-fingerprint, Oiling, or Bare (as per customer request) |
| Coil Weight | 3 – 15 MT |
| Standard | EN 10346, ASTM A653, JIS G3302 |
Core Advantages
Direct PPGI Feedstock – Our GI coil meets strict surface quality standards required for premium paint adhesion.
Formability – Low-carbon grades (e.g., DX51D, DX52D) offer excellent deep-drawing and bending properties.
Sacrificial Protection – Zinc provides cathodic protection to cut edges, preventing rust creep even if the surface is scratched.
Cost-Effective – Lower cost than stainless steel or aluminum, making it ideal for large-scale construction.
Applications
PPGI production: The raw substrate for color-coated building materials.
Construction: Roofing components, wall frames, floor decking, cable trays.
Automotive: Underbody parts, fuel tanks, brackets.
Agriculture: Grain bins, irrigation pipes.
Light industry: Electrical enclosures, furniture frames.
