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Hot Dipped Galvanized Coil
Hot Dipped Galvanized Coil
Hot-dip galvanized steel coils are steel coils immersed in molten zinc, which forms a metallic bond with the steel substrate. This process creates a corrosion-resistant zinc coating that helps extend the steel’s lifespan. Compared to electro-galvanized steel coils, hot-dip galvanizing produces a thicker, more durable coating that uniformly protects the entire surface of the coil. Hot-dip galvanized steel coils offer high strength and corrosion resistance, making them widely used in industries like construction, manufacturing, and automotive.
Product Specifications
| Dimension Name | Value | |
| Material | galvanized steel coil | |
| Size | Thickness (mm) | 0.18 – 6.0 (Customizable based on requirements) |
| Width (mm) | 0.18 – 6.0 (Customizable based on requirements) | |
| Coil ID (mm) | 508 / 610 (Standard; others can be accommodated) | |
| Coil Weight (tons) | 3 – 25 (Depending on thickness and width) | |
| Chemical Parameters | Zinc Coating Mass (g/m²) | 60 – 600 (As per ASTM A653 or equivalent standards) |
| Zinc Composition (%) | 99.99% minimum purity (for coating) | |
| Base Metal Chemistry (Typical for Steel) | C: ≤0.12% Mn: ≤0.60% P: ≤0.035% S: ≤0.035% Si: ≤0.03% | |
| Mechanical Properties | Yield Strength (MPa) | 230 – 550 (Depending on steel grade and thickness) |
| Tensile Strength (MPa) | 270 – 700 (Depending on steel grade and thickness) | |
| Elongation (%) | ≥18% (For most grades; specific values may vary) | |
| Bend Test | Pass (As per ASTM A653 bend test requirements) | |
| Grade | Standard Grades | DX51D, DX52D, DX53D, S250GD, S350GD, S550GD (Others available on request) |
| Equivalent International Standards | ASTM A653, JIS G3302, EN 10346, etc. | |
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Advantages
- Corrosion Resistance: Hot-dip galvanized steel coils feature a thick zinc layer that shields the underlying steel from rust and deterioration. In harsh environments like moisture, chemicals, and saltwater, galvanized coils can withstand corrosion, making them suitable for outdoor use and coastal areas.
- Cost-effectiveness: The corrosion resistance decreases the need for maintenance of hot-dip galvanized coils over their lifespan, thereby reducing long-term costs related to upkeep and replacement. The durable zinc coating extends the steel’s lifespan, offering better cost-efficiency.
- Environmental Protection: Composed of highly recyclable zinc and steel, hot-dip galvanized coils can reduce waste generation and protect the environment.
- Plasticity: Hot-dip galvanized coils possess the formability of the underlying steel, allowing them to be easily bent, cut, and shaped to meet specific design requirements.
- High Strength-to-Weight Ratio: Hot-dip galvanized steel offers high strength and relatively low weight, making it an efficient choice for structural applications and providing benefits in load capacity and material savings.
- Fire resistance and safety: The material of hot-dip galvanized steel coils is non-combustible, so it can prevent the spread of fire and maintain safety in buildings and other flammable applications.
Applications
- Construction Industry: Because of their strength, durability, and resistance to rust and corrosion, hot-dip galvanized coils are used to create structural steel frames, beams, columns, and trusses for buildings, bridges, and other infrastructure projects.
- Automotive Industry: Hot-dip galvanized coils are used to make vehicle body panels, chassis parts, and underbody components. The zinc coating guards these parts against road salt, moisture, and other corrosive elements, ensuring vehicle durability and dependability.
- Electrical Enclosures and Cabinets: Galvanized coils are shaped into electrical enclosures, control cabinets, and junction boxes, providing safe and corrosion-resistant housing for electrical components.
- Agriculture: Farm machinery frequently uses galvanized steel for exposed parts to ensure reliable operation in agricultural settings.
- Energy Industry: Hot-dip galvanized coils are used to make mounting structures for solar panels, offering a strong and corrosion-resistant framework.
Treatments
- Temper Passing: The hot-dipped galvanized coils go through light cold rolling in the temper mill to improve surface flatness, satisfying high standards for appearance and coating performance in various applications.
- Chemical Treatment or Oiling: Applying a fingerprint-resistant chemical coating or anti-rust oil to the surface to prevent staining or white rust during storage and transportation caused by contact with moisture and dust.
- Galvanneal: Heating hot-dipped galvanized coils to approximately 500-600°C causes zinc layers to partially diffuse with the iron substrate, forming a zinc-iron alloy layer that increases the coating’s hardness, wear resistance, and adhesion, while lowering the zinc layer’s melting point (facilitating subsequent welding).
- Edge Protection Treatment: Edge passivation or coating repair involves spraying zinc powder, zinc-rich paint, or organic coatings on the cut edges of the coils. This prevents the preferential corrosion of the exposed base metal at the cut edges.
