Grade: Prime Roll-Forming Grade GI Coil (DX51D / SGCC)
Key Advantage: Guaranteed zero paint & zinc flaking under high-speed .
Gauge Precision: Strict thickness tolerance protects your roll-forming lies.
Mill Authority: Engineered by a 30-year veteran factory with 20+ years of export reliability.
Engineered specifically for continuous, high-speed roll-forming machinery, our Prime Roll-Forming Grade Galvanized Steel Coil (GI) combines a high-purity hot-dip zinc coating with an ultra-flat steel substrate. Produced by our veteran mill with 30 years of advanced steel manufacturing expertise, this product is designed to pass through aggressive profiling dies without zinc flaking, surface cracking, or necking.
Over our 20+ years of global export operations, we have refined our skin-pass and tension-leveling lines to achieve near-zero camber and strict gauge consistency. This eliminates machine jamming, reduces line downtime, and protects roll-forming dies, making it the preferred baseline coil for roofing sheet manufacturers across Latin America, Southeast Asia, and Africa.
|
Technical Parameter |
Specification & Manufacturing Range |
|
Steel Grade Standard |
DX51D+Z, SGCC, ASTM A653 CS Type A/B, JIS G3302 |
|
Thickness Range |
0.10 mm – 3.50 mm ($\pm0.015\text{mm}$ precise gauge tolerance) |
|
Coil Width Scope |
600 mm – 1250 mm (Standard: 914mm, 1000mm, 1200mm, 1220mm, 1250mm) |
|
Zinc Coating Weight |
Z30 – Z600 $\text{g/m}^2$ (Total double-sided mass) |
|
Spangle Topography |
Regular Spangle / Zero Spangle / Minimized Spangle |
|
Surface Treatment |
Chromated (Cr3+ Passivated), Lightly Oiled / Dry |
|
Coil Inner Diameter |
508 mm or 610 mm (Equipped with internal sleeve reinforcement) |
Architectural Roofing Panels: Corrugated roof sheets, trapezoidal IBR panels, and tile-effect roof profiles.
Building Enclosures: Industrial wall cladding, warehouse perimeter siding, and rolling shutter doors.
Agricultural Structures: Modular grain storage bins, farm shed roofing, and livestock perimeter fencing.
To guarantee zero moisture oxidation (white rust) during long-distance ocean freight, every coil is packaged under our 4-Layer Seaworthy Encapsulation Protocol:
Inner Layer: Moisture-proof VCI anti-rust chemical paper combined with a heavy plastic protective film wrap.
Intermediate Protection: High-density galvanized inner and outer edge protectors to shield against crane cable impact.
Outer Encapsulation: Heavy-gauge corrugated galvanized steel outer sleeve strapped with 4 radial and 3 circumferential steel bands.
Base Support: Mounted on treated wooden or steel pallets with under-skid clearance for forklift loading.
