Steel FAQs
Your trusted resource for Galvanized Steel Coil FAQs, Galvalume Steel FAQs, and expert answers on specifications, applications, processing, maintenance, transport, and quality assurance.
Welcome to the Hengze Steel FAQ Center — your go-to resource for answers on product specifications, performance, applications, processing, transportation, and maintenance. Explore our Galvanized Steel Coil FAQs, Galvalume Steel FAQs, and other coil product guides.
Product Specifications & Standards
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Galvanized Steel Coil (GI) – Coated with pure zinc (Zn) for excellent corrosion protection in moderate environments.
Galvalume Steel Coil (GL) – Coated with aluminum-zinc alloy (55% Al, 43.5% Zn, 1.5% Si) for superior corrosion resistance, especially in marine and industrial zones.
Prepainted Galvanized Steel Coil (PPGI) – GI substrate with a durable color coating for enhanced aesthetics and added protection.
Prepainted Galvalume Steel Coil (PPGL) – GL substrate with color coating, combining aesthetic appeal and long-term corrosion performance.
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Our steel coils comply with international standards including:
ASTM A653 / A792 (USA)
JIS G3302 / G3321 (Japan)
EN 10346 (Europe)
ISO 4998 (International)
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GI coating: Z40 – Z275 (40–275 g/m²)
GL coating: AZ50 – AZ150 (50–150 g/m²)
Coating weight can be customized based on application and corrosion requirements.
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For structural strength, grades like G350, G450, G550, S550GD are recommended.
For formability, opt for softer grades such as G250 or DX51D.
Applications & Suitability
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We recommend PPGL or Zn-Al-Mg coated steel coil due to their superior salt spray resistance in marine environments.
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Yes. Prepainted Galvanized Steel Coil (PPGI) is widely used for refrigerator panels, washing machine covers, and interior appliance components.
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Yes. Zn-Al-Mg coating offers 3–6 times better corrosion resistance than standard GI in highly corrosive environments.
Processing & Installation
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Yes. Our coils meet strict elongation and yield strength standards, ensuring smooth roll forming when correct tooling is used.
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Use ventilation systems to remove zinc oxide fumes, and select welding methods such as MIG or spot welding for best results.
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Generally 2–4 times the sheet thickness, depending on coating type and substrate grade.
Surface Treatment & Maintenance
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Wash with mild detergent and water twice a year.
Avoid abrasive cleaning tools.
Inspect edges for scratches and touch up with matching paint.
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Use soft cloth or sponge with neutral pH detergent. Avoid strong acids, alkalis, or solvents.
Transport & Storage
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Keep in a dry, ventilated warehouse.
Place coils on wooden pallets, not directly on the ground.
Cover with waterproof sheets but allow airflow.
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Not recommended. If unavoidable, use sealed tarpaulins and unload immediately upon arrival.
Ordering & Quality Assurance
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Usually 15–30 days after order confirmation, depending on product type and quantity.
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All coils undergo coating thickness measurement, salt spray testing, and adhesion tests before shipment.
FAQ Categories
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Product SpecificationsProduct Specifications
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Applications & SuitabilityApplications & Suitability
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Processing & InstallationProcessing & Installation
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Surface Treatment & MaintenanceSurface Treatment & Maintenance
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Transport & StorageTransport & Storage
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Ordering & Quality AssuranceOrdering & Quality Assurance
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