Our Hot-Dip Galvanized Steel Coils (GI) are produced in full compliance with international standards (ASTM A653, EN 10346, JIS G3302), providing superior cathodic corrosion resistance and reliable mechanical consistency for precision manufacturing.
Dimensions & Zinc: Thickness 0.1–3.5 mm | Width 870–1250 mm | Zinc Coating 30–600 g/m²
Surface Finish: Zero Spangle, Small Spangle, Regular Spangle, Large Spangle
Coil Specifications: Weight 3–24 MT | Inner Diameter 508 mm / 610 mm
Quality Assurance: Mill Test Certificate (MTC EN 10204 3.1) & SGS/BV Inspection Ready
Authentic Steel supplies high-grade Hot-Dip Galvanized Steel Coils (GI) engineered for maximum corrosion resistance, superior surface aesthetic, and long-term durability. Manufactured by continuously passing cold-rolled steel coils through a high-purity molten zinc bath, our GI coils feature a tight, durable metallurgical bond between the zinc coating and the underlying steel substrate. This cathodic sacrificial protection layer effectively halts atmospheric corrosion, moisture penetration, and oxidation, extending the service life of finished components even in humid, marine, and industrial outdoor environments.
Produced in strict accordance with premier international standards—including ASTM A653, EN 10346, JIS G3302, and GB/T 2518—our hot-dip galvanized steel coils provide consistent zinc coating distribution, tight dimensional gauge tolerances, and reliable mechanical properties throughout the entire length of the roll. Whether utilized for structural roll-forming, automated stamping, or prepainted steel (PPGI) feedstock, our GI materials deliver exceptional performance for global manufacturers and engineering buyers.
Cathodic Sacrificial Protection: The sacrificial zinc layer shields cut edges, welds, and surface scratches from rust, offering extended maintenance-free service life in harsh environments.
Versatile Spangle Conditions: Available in Zero Spangle for ultra-smooth painting and powder-coating substrates, as well as Regular, Small, and Big Spangle finishes for classic industrial and structural aesthetics.
Wide Zinc Coating Mass Range: Customizable zinc weights from light coatings (Z30–Z80 / 30–80 g/m²) for economical indoor appliances up to heavy coatings (Z180–Z600 / 180–600 g/m²) for demanding outdoor structural exposure.
Custom Processing & Value-Added Services: In-house longitudinal precision slitting into narrow GI strips, cut-to-length sheet flattening, tension leveling, and custom edge conditioning.
Full Global Compliance & MTC Certification: Fully compliant with global building codes and industrial standards, accompanied by official EN 10204 3.1 Mill Test Certificates (MTC) verifying chemical and physical properties.
Specifications
Zero Spangle (Minimized / Extra Smooth): Produced using specialized zinc bath chemistry and rapid cooling control. The surface solidifies without visible crystal grains, offering an ultra-smooth finish ideal for powder coating, aesthetic panels, home appliances, and PPGI feedstock.
Regular / Standard Spangle: Features the classic zinc crystal flower surface for general construction, corrugated roofing sheets, and industrial HVAC air ducting.
Surface Passivation Options: Available with Chromate Passivation (C) to prevent white rust during maritime transit, Anti-Fingerprint (AFP) coating for interior structural framing, or light oiling for stamping lubrication.
Thanks to its reliable rust resistance and excellent cold formability, hot-dip galvanized steel coil serves as an indispensable raw stock across major global sectors:
Building & Construction: Corrugated roofing sheets, wall cladding panels, HVAC air ducting, light-gauge steel framing (LGSF), drywall studs, and cable trays.
Automotive & Hardware: Underbody structural brackets, internal chassis components, door frames, hinges, and electrical enclosures.
Home Appliances: Refrigerator back plates, washing machine outer housings, air conditioner brackets, and steel office furniture.
Processing Compatibility:
GI coils can be efficiently processed on standard uncoiling, precision slitting, cut-to-length, stamping, roll-forming, and bending lines. The uniform zinc layer and consistent mechanical properties help reduce coating damage and improve production stability.
We offer value-added processing services including precision longitudinal slitting, cut-to-length sheet flattening, and edge conditioning. All coils are prepared for long-distance maritime transport with heavy-duty export packaging: rust-inhibitive VCI paper, waterproof plastic film, outer steel protective sleeves, and heavy-duty steel strapping on seaworthy wooden pallets. Official Mill Test Certificates (MTC / EN 10204 3.1) and technical data sheets are accompanied with each shipment.
Contact our technical sales team today for detailed technical datasheets, mill test certificates (MTC), and real-time market price quotes!
WhatsApp: +86-137 8227 9845
E-mail: alice@authsteel.com
