Galvanized Steel Coil

Galvanized Coil: Premium Corrosion-Resistant Steel for Global Applications

1. Raw Material Composition

At the core of our galvanized coils lies high-quality low-carbon steel substrates, selected for their superior mechanical properties and compatibility with galvanizing processes. We utilize two primary substrate types to cater to diverse application needs:

• Cold-rolled steel strips: Ideal for applications requiring precise surface quality and deep drawability (e.g., home appliances, automotive parts), with grades like Q195, Q235, and Q345 ensuring excellent welding and stamping performance.
• Hot-rolled steel strips: Preferred for structural applications (e.g., steel silos, construction frameworks) due to their robust strength, available in grades such as SGC 340, SGC 490, and SGH 400.

The protective coating consists of pure zinc (Zn) or zinc-aluminum (Al-Zn) alloy, applied via hot-dip technology to form a metallurgically bonded layer that prevents rust and environmental degradation.

2. Precision Manufacturing Process

Our galvanized coils undergo a stringent, continuous production process to ensure uniform quality and performance:

1. Raw Material Preparation: Substrate steel coils are cut to specified dimensions and inspected for impurities or defects.
2. Cleaning & Pre-Treatment: The steel undergoes degreasing (alkaline solution) to remove oil/grease, pickling (mild acid) to eliminate rust/mill scale, and rinsing to neutralize residues-critical for coating adhesion.
3. Hot-Dip Galvanizing: Cleaned steel is immersed in a molten zinc bath (≈450℃/842°F), where zinc reacts with steel to form a dense zinc-iron alloy layer. This step delivers unmatched corrosion resistance.
4. Cooling & Finishing: Coils are cooled to solidify the coating, then treated with options like anti-rust oil, PVC film, or color painting based on customer needs.
5. Quality Inspection: Each coil undergoes testing for coating thickness, surface finish, and mechanical properties before packaging.

3. Global Standards & Specifications

Our galvanized coils are manufactured to comply with major international standards, ensuring market access and performance consistency worldwide:

Key Global Standards

Product Specifications

• Thickness: 0.12-6.00 mm (customizable for special applications)
• Width: 600-1850 mm (adjustable to fit processing equipment)
• Coil Weight: 3-8 tons per coil
• Zinc Coating Mass: 40-440 g/m² (double-sided); 30-220 g/m² (single-sided). High-end specs (275 g/m²+) suit outdoor/harsh environments
• Grades: Includes DX51D-DX57D (Europe), SGCC/SGH400 (Japan), S220GD-S550GD (structural), and Q195-Q345 (China)
• Surface Finish: Regular spangle, minimized spangle, or zero spangle (for aesthetic needs)

4. Certification & Quality Assurance

Our commitment to quality is validated by globally recognized certifications:

• Management System: ISO 9001 (quality management)
• Product Certifications: CE, API, SGS, and BV-ensuring compliance with safety and performance standards
• Third-Party Validation: Accepts independent inspections (e.g., SGS) for coating thickness, mechanical properties, and corrosion resistance

Here is a comprehensive specification sheet for galvanized coils, organized by global standards and technical parameters to meet international (recognition) and clarity requirements:

Galvanized Coil: Technical Specifications & Global Standards Compliance

General Product Parameters

Zinc Coating Specifications

Mechanical Properties

RegionalStandard Compliance

North America (ASTM A653/A653M)

Europe (EN 10346)

Japan (JIS G3302)

China (GB/T 2518)

Australia/New Zealand (AS/NZS 4671)