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Electro Galvanized Steel Coil
Electro Galvanized Steel Coil
Electro galvanized steel coil is a type of steel coil coated with a zinc layer through electroplating, with one or both sides covered in a corrosion-resistant zinc coating using electrodeposition technology. Electroplated zinc coatings provide corrosion protection and a smooth, uniform surface that enhances forming and joining processes. This coating is applied to cold-rolled steel at low temperatures. Therefore, electro-galvanized steel is also known as cold galvanized steel.
Product Specifications
| Dimension Name | Value | |
| Material | galvanized steel coil | |
| Size | Thickness (mm) | 0.20 – 3.00 (customizable) |
| Width (mm) | 600 – 1,500 (standard: 1,219/1,250) | |
| Coil ID (mm) | 508 / 610 (standard) | |
| Coil Weight (tons) | 5 – 25 (depending on thickness/width) | |
| Chemical Parameters | Zinc Coating (Electroplated) | Zn: 99.99% min purity (optional alloying elements: Ni, Fe, Co < 0.1% each) |
| Base Metal (Cold-Rolled Steel) | C ≤ 0.15% Mn ≤ 0.80% P ≤ 0.035% S ≤ 0.035% Si ≤ 0.03% Al ≥ 0.015% | |
| Mechanical Properties | Yield Strength (MPa) | 240 – 420 (grade-dependent) |
| Tensile Strength (MPa) | 340 – 520 (grade-dependent) | |
| Elongation (%) | 18 – 35 (ASTM A370) | |
| Hardness (HV) | 70 – 120 (grade-dependent) | |
| Surface Treatment | Standard Finish | Bright annealed (BA), matte (dull) |
| Chemical Treatments | Chromate passivation (Cr³⁺/Cr⁶⁺-free options), phosphate coating | |
| Organic Coatings | Anti-fingerprint (AF), lubricated (oil/dry film), corrosion-resistant primer | |
| Special Finishes | Wrinkle, textured, or pre-painted (upon request) | |
| Grade | Commercial Grades | SECC (JIS G3313), DX1/DX2 (EN 10346), A653 (ASTM A653) |
| Structural Grades | SECD, SEDD (high-strength variants) | |
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Advantages
- Outstanding surface quality: The electroplating process produces a highly uniform zinc layer, enabling the electroplated galvanized steel coils to be used directly for painting or deep processing. This reduces the need for additional procedures like grinding and polishing, while preserving a high aesthetic appeal. Additionally, the zinc layer thickness is precisely controllable, with options as thin as 3–5μm, meeting lightweight design requirements.
- Outstanding processing performance: Steel coils are typically made from cold-rolled plates, offering excellent ductility and ease of shaping through processes like stamping, stretching, and bending. The bond strength between the electroplated zinc layer and the substrate is robust, making it less likely to peel during deep processing. In contrast, hot-dip galvanized layers may crack when bent.
- Excellent corrosion resistance: Chemical passivation treatment delays white rust and red rust formation, improving the corrosion resistance of the electroplated galvanized steel coils, making them suitable for moderate corrosion environments (such as indoors/dry outdoors).
- Environmentally Friendly: The energy used in the electroplating process is only one-third of that used in hot-dip galvanizing, resulting in lower carbon emissions.
- Optimized cost efficiency: The thin zinc layer minimizes zinc use and decreases raw material expenses. The electroplating process allows precise control, reducing production waste and scrap rates.
Applications
- Automobile Manufacturing: The thin zinc layer and smooth surface of electro-galvanized steel sheets fulfill both aesthetic and corrosion resistance needs for automotive exterior panels, such as doors, hoods, and roofs. The zinc layer’s corrosion resistance, combined with the high ductility of the cold-rolled substrate, enables the stamping of complex shapes for chassis parts.
- Construction and Light Industry: For interior decoration materials such as ceilings, partitions, and wall decorations, the smooth surface of electro-galvanized steel sheets can function directly as a decorative finish or as a substrate for coatings. Lightweight steel structures, like warehouse shelves and small steel buildings, gain from the corrosion resistance of electro-galvanized steel sheets in dry indoor environments. Hardware products such as locks, hinges, and sliding rails can lower friction and prolong service life through lubricating coatings.
- Home Appliances and Electronics: Electro-galvanized steel sheets are widely used for the outer shells of home appliances like refrigerators, washing machines, and air conditioners because of their fingerprint-resistant coating that prevents residue and makes painting easier. Internal parts such as compressor brackets and motor housings benefit from their resistance to salt spray, which helps extend their lifespan. Metal casings or supports for electronic devices achieve lightweight designs thanks to the thin profile of electro-galvanized steel sheets.
- Industrial Manufacturing: The uniform zinc coating on electro-galvanized steel sheets ensures that no zinc is missing from edges after stamping, meeting corrosion resistance requirements for precision stamped parts like connectors, terminals, and sensor housings. This benefit also extends to pipelines carrying dry gases or liquids, such as air conditioning ducts and compressed air lines. Additionally, it is widely used in the beverage canning industry, where the zinc layer helps prevent the contents from corroding.
- New Energy Sector: The shell material for batteries can leverage the corrosion resistance to electrolytes provided by electro-galvanized steel sheets. In photovoltaic power generation systems located in dry areas, electro-galvanized steel sheets act as support materials, balancing cost and corrosion resistance.
