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Galvanized Steel Sheets Explained

彩涂卷
December 22, 2025
Category Connection: PPGI Steel Coil
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Tags:
#PPGI Coil Sheet #PPGI Coated Coil #Prepainted Steel Coil
Brief: Join a quick walkthrough that focuses on what matters to users and operators. In this video, we explain the different types of galvanized steel sheets, including hot-dip, electro-galvanized, and galvannealed varieties. You'll see the core production process from substrate pre-treatment to final coiling, helping you understand their applications in construction, automotive, and appliances.
Related Product Features:
  • Available in hot-dip galvanized (HDG) with thick zinc layers for high corrosion resistance in construction and outdoor use.
  • Electro-galvanized (EG) options provide thin, smooth zinc coatings ideal for home appliances and interior components.
  • Galvannealed (GA) sheets feature a zinc-iron alloy layer for excellent weldability, commonly used in auto bodies.
  • Produced on both cold-rolled substrates for high precision and flat surfaces, and hot-rolled for cost-effective structural parts.
  • Includes passivated and chromium-free passivated surface treatments to enhance coating adhesion and meet environmental standards.
  • Manufactured through continuous automated processes including annealing, galvanizing, and precise zinc layer control.
  • Offers global shipping and a service life of 10-20 years, ensuring long-term durability for international B2B clients.
  • Suitable for various applications from heavy equipment to products requiring high aesthetic standards.
FAQs:
  • What are the main types of galvanized steel sheets available?
    Galvanized steel sheets are primarily categorized by galvanizing process: Hot-Dip Galvanized (HDG) for thick zinc layers and high corrosion resistance; Electro-Galvanized (EG) for thin, smooth surfaces; and Galvannealed (GA) for zinc-iron alloy layers with good weldability. They also vary by substrate type (cold-rolled or hot-rolled) and surface treatment.
  • How is the production process for hot-dip galvanized sheets carried out?
    The production process for hot-dip galvanized sheets involves continuous automated steps: substrate pre-treatment (uncoiling, cleaning, degreasing), annealing at 800-900°C in a reducing atmosphere, immersion in 450°C molten zinc for coating, zinc layer control using air knives, optional passivation, and final slitting and coiling after quality inspection.
  • What are the typical applications and service life of these galvanized steel sheets?
    HDG sheets are used in construction and outdoor facilities, EG sheets for home appliances and interior parts, and GA sheets for auto bodies. With proper use, these sheets offer a service life of 10-20 years, supported by their corrosion-resistant zinc coatings and robust production standards.
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