Email：salehongfeng@163.com
Product Detail
Manufacturer 0.1mm-8mm Galvanized Sheet Thin Gi Hot-dip Galvanized Steel Plate
+8618919691192
Inquire Now
Detail

1. Product Overview

Galvanized Sheet, also known as galvanized steel sheet, is a high-performance metal product manufactured by applying a protective zinc coating to a cold-rolled or hot-rolled steel base. The zinc coating forms a physical barrier against corrosion and provides cathodic protection (sacrificing itself to prevent the underlying steel from rusting), significantly extending the material’s service life in harsh environments. It balances flexibility, formability, and cost-effectiveness, making it a staple in industries ranging from construction to home appliances.

2. Core Specifications

Specification CategoryDetails
Material Grade- Carbon steel bases: Q195, Q235 (Chinese standard); ASTM A36, ASTM A653 (US standard); S235JR, S355JR (EU standard)
- Zinc coating: Pure zinc (Zn) or zinc alloys (e.g., Zn-Al-Mg for enhanced corrosion resistance)
Thickness Range0.1mm – 6mm (common: 0.3mm – 3mm for general use; ultra-thin sheets <0.1mm for special applications like electronics)
Width Range600mm – 2,000mm (custom widths available via slitting; standard widths: 1,000mm, 1,220mm, 1,500mm)
Length Range- Coiled form: 50m – 300m per coil (inner diameter: 508mm/610mm)
- Flat form: 1,000mm – 6,000mm (custom lengths on request)
Zinc Coating Weight- Electro-galvanized (EG): 10g/m² – 100g/m² (per side)
- Hot-dip galvanized (HDG): 40g/m² – 600g/m² (per side); common grades: Z60, Z100, Z275 (EN standard)
Surface Finish- Regular spangle (visible zinc crystal pattern, cost-effective)
- Minimized spangle (smooth surface, ideal for painting/printing)
- Zero spangle (ultra-smooth surface, used for high-end appliances/automotive parts)
Mechanical Properties- Tensile strength: 270MPa – 550MPa
- Elongation: 10% – 40% (varies by thickness/grade; higher elongation for cold-rolled bases)
- Hardness: HRB 50 – 90 (soft to medium-hard, suitable for bending/stamping)

3. Manufacturing Process

The production of galvanized sheets follows a strict, multi-step workflow to ensure coating uniformity and adhesion:

  1. Steel Base Preparation: Cold-rolled or hot-rolled steel coils are uncoiled and trimmed to remove burrs.

  2. Cleaning & Pickling: The steel surface is degreased (to remove oil) and pickled (with hydrochloric/sulfuric acid) to eliminate rust/oxide layers, ensuring zinc adhesion.

  3. Galvanizing:

    • Hot-Dip Galvanizing (HDG): The cleaned steel is dipped into a molten zinc bath (440°C – 460°C), forming a thick, durable zinc-iron alloy layer + pure zinc layer.

    • Electro-Galvanizing (EG): The steel acts as a cathode in an electrolytic bath (zinc sulfate solution); zinc ions deposit on the surface to form a thin, uniform coating.


  4. Post-Treatment:

    • Passivation (chromate or non-chromate coating) to enhance corrosion resistance and prevent white rust.

    • Oil coating (light mineral oil) to reduce friction during processing (e.g., stamping).

    • Cooling & leveling: The sheet is cooled to room temperature and flattened to ensure flatness.


  5. Finishing: Coiled into steel coils or cut into flat sheets per customer requirements.

4. Key Advantages

  • Superior Corrosion Resistance: The zinc coating protects steel from moisture, chemicals, and outdoor elements (service life: 15 – 30 years in rural areas; 5 – 15 years in coastal/industrial areas).

  • Excellent Formability: Flexible enough for cold processing (stamping, bending, rolling, welding) without cracking the zinc coating—ideal for complex shapes (e.g., appliance shells, pipe fittings).

  • Cost-Effective: Lower maintenance costs compared to uncoated steel (no frequent painting/anti-rust treatments); competitive upfront cost vs. stainless steel.

  • Versatile Surface Options: Various spangle finishes and post-treatments meet aesthetic and functional needs (e.g., zero-spangle sheets for high-end decorative parts).

  • Eco-Friendly: 100% recyclable (both steel and zinc), aligning with sustainable manufacturing standards.

5. Application Fields

Galvanized sheets are widely used across industries due to their balanced performance:

  • Construction: Light steel keels, sandwich panel cores (for walls/roofs), roller shutters, ventilation ducts, and fence panels.

  • Home Appliances: Outer casings of refrigerators, washing machines, and air conditioners; microwave oven liners (EG sheets for smoothness).

  • Automotive: Lightweight structural parts (e.g., chassis brackets), door frames, and underbody components (HDG sheets for durability).

  • Packaging: Metal buckets (paint/chemical containers), aerosol cans, and shipping pallets.

  • Electronics: Enclosures for power distribution boxes, LED light fixtures, and small electronic devices.

  • Daily Necessities: Metal shelves, clothes hangers, file cabinets, and garden tools.

6. Quality Standards & Certifications

All products comply with international and regional standards to ensure consistency and reliability:

  • International: ISO 1461 (hot-dip galvanized steel), ISO 8191 (electro-galvanized steel)

  • US: ASTM A653 (hot-dip), ASTM B633 (electro-galvanized)

  • EU: EN 10346 (hot-dip), EN 10152 (electro-galvanized)

  • China: GB/T 2518 (hot-dip), GB/T 15675 (electro-galvanized)

  • Certifications: SGS, BV, TUV (for material composition and performance testing)

7. Packaging & Storage

  • Packaging:

    • Coiled sheets: Wrapped in moisture-proof PE film + kraft paper, with steel strips fixed on wooden pallets (inner diameter: 508mm/610mm; outer diameter: ≤1,800mm).

    • Flat sheets: Stacked on wooden pallets, separated by anti-scratch paper, and covered with waterproof film.


  • Storage: Store in a dry, well-ventilated warehouse; avoid direct sunlight, rain, or high humidity (to prevent white rust). Coils should be placed vertically to avoid deformation.

8. Customization Services

We offer tailored solutions to meet specific customer needs:

  • Custom thickness/width/length (minimum order quantity: 5 tons for coiled sheets; 1 ton for flat sheets).

  • Special zinc coating weights (e.g., Z600 for extreme corrosion environments like offshore projects).

  • Custom surface finishes (e.g., non-chromate passivation for eco-sensitive industries).

  • Cutting, slitting, and stamping (pre-processing to reduce customer production steps).