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Galvanized steel sheets/coils are a type of corrosion-resistant steel product manufactured by applying a zinc coating to the surface of cold-rolled or hot-rolled steel substrates via hot-dip galvanizing or electro-galvanizing processes. The zinc coating forms a physical barrier against air and moisture, and provides cathodic protection—even if the coating is scratched, the zinc will corrode preferentially to protect the underlying steel from rusting.
| Process | Technical Principles | Key Characteristics | Typical Coating Weight |
|---|---|---|---|
| Hot-Dip Galvanizing | Steel substrate is cleaned then immersed in molten zinc bath (440–460℃). Zinc reacts with steel to form a zinc-iron alloy layer. | Thick coating, strong adhesion, excellent corrosion resistance; surface may have spangles. | 60–275 g/m² (G30, G60, G90) |
| Electro-Galvanizing | Zinc ions are deposited on the steel surface via electrolysis under low voltage. | Thin, uniform coating; smooth, bright surface; no spangles; good paintability. | 5–40 g/m² |
| Type | Features | Application Scenarios |
|---|---|---|
| Spangled | Zinc crystals form flower-like patterns (regular, minimized, or big spangle). | Roof panels, wall cladding, agricultural equipment. |
| Zero-Spangle | Smooth, flat surface inhibited by trace elements or controlled cooling. | Home appliance shells, automotive parts, decorative components. |
| Parameter | Hot-Dip Galvanized Steel | Electro-Galvanized Steel |
|---|---|---|
| Thickness | 0.2–3.0 mm (coils); 0.3–6.0 mm (sheets) | 0.12–2.0 mm (coils); 0.15–2.0 mm (sheets) |
| Width | 600–1500 mm (standard); up to 2000 mm | 500–1250 mm (standard) |
| Coil Inner Diameter | 508 mm / 610 mm | 508 mm / 610 mm |
| Coil Weight | 3–15 tons | 1–8 tons |
Widely used in construction (roofing, siding), home appliances (washing machines, refrigerators), automotive industry (body parts), and industrial equipment manufacturing due to its strength and durability.
With over 15+ years of manufacturing experience, we specialize in high-quality galvanized steel, stainless steel, and various structural steel products. Our facility covers more than 8,000 square meters with an annual capacity reaching 100,000 tons. We maintain a strong supply chain to ensure competitive pricing and premium quality for clients worldwide.
