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508mm 610mm Hot Dipped Galvanized Steel Coils For Roof Panels Gl Steel Coil
| MOQ: | 1ton |
| Price: | negotiate |
| Standard Packaging: | Standard seaworthy export packing or as customer demands |
| Delivery Period: | Negotiated |
| Payment Method: | T/T,Western Union,L/C |
| Supply Capacity: | 10000tons per month |
508mm Galvanized Steel Coils
,610mm Galvanized Steel Coils
,Hot Dipped gl steel coil
Prime Quality Hot-dipped Galvanized Steel Coils used for roof panels with exceptional corrosion resistance and processing performance.
- Physical Barrier: Zinc layer tightly covers steel surface, isolating it from corrosive media
- Electrochemical Protection: Zinc acts as sacrificial anode, preferentially corroding to protect steel base material
Excellent coating adhesion allowing bending, stamping, stretching and forming without peeling
Unique zinc flower patterns with uniform color finish, suitable for direct use or as substrate for color-coated sheets
More economical than painting or stainless steel for equivalent protection lifespan
- Uncoiling and Welding: Continuous operation through coil joining
- Cleaning and Pre-treatment: Complete removal of oil and iron oxide scale
- Annealing: Recrystallization and softening in reducing atmosphere
- Hot-Dip Galvanizing: Immersion in molten zinc bath with air knife coating control
- Alloying Treatment (Optional): Conversion to zinc-iron alloy layer for GA coils
- Cooling and Passivation: Chemical treatment to prevent white rust formation
- Finishing and Stretching (Optional): Surface improvement and mechanical property adjustment
- Rolling and Packaging: Final product winding and packaging
- Low Processing Cost: More economical than other paint coatings
- Multi-faceted Protection: Complete coverage including recesses, sharp corners and hidden areas
- Simple Inspection: Visual and non-destructive coating thickness testing
| Industry | Applications |
|---|---|
| Construction, Light Industry, Automotive, Agriculture, Animal Husbandry, Fishery | Building roofs, highway guardrails, sheet metal processing, roof grilles, household appliance enclosures, ventilation ducts, chimneys, kitchen utensils, grain storage and transportation, frozen processing of meat and aquatic products |
Custom packaging available according to customer requirements and factory standards
Zinc coating weight (zinc mass) measured in g/m² (both sides total) determines corrosion resistance lifespan.
| Grade | Coating Mass (g/m²) | Typical Application |
|---|---|---|
| Z40-Z80 | 40-80 | Indoor use, light protection |
| Z100-Z140 | 100-140 | General construction, roofing |
| Z180-Z275 | 180-275 | Heavy industry, structural components |
| Z350-Z450 | 350-450 | Coastal areas, high-corrosion environments |
Higher coating weight = longer service life = higher cost. Selection based on actual environmental conditions recommended.
Our galvanized steel coils comply with major international standards:
- ASTM A653 - American Standard
- JIS G3302 - Japanese Standard
- EN 10346 - European Standard
- GB/T 2518 - Chinese Standard
All products come with Mill Test Certificates (MTC) provided upon shipment.
Spangle refers to visible crystal patterns on galvanized steel surface formed during zinc coating solidification.
| Type | Description | Best For |
|---|---|---|
| Regular Spangle | Visible snowflake-like crystals | Applications where appearance is not critical; prepainted base |
| Zero Spangle | Smooth, uniform surface with no visible crystals | Painting applications, prepainted steel, automotive parts where surface smoothness matters |
If painting directly on surface, zero spangle strongly recommended for better paint adhesion.
While offering excellent corrosion protection, white rust (zinc oxide) can occur under:
- Poor ventilation during storage
- High humidity or condensation
- Direct contact with rainwater
Prevention methods include:
- Passivation treatment: Chromate or chromium-free passivation applied before shipment
- Oil coating: Anti-rust oil for ocean freight shipments
- Proper storage: Dry, ventilated warehouse; avoid outdoor storage
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