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Help CenterSteel Coil & Strip & Color Coated Coil，GB/T 12754-2019、ASTM A755、EN 10169
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Product Description of Pre-painted Steel Coil
1. Product Introduction
Pre-painted steel coil (also known as color coated steel coil) is manufactured by using cold rolled coil, hot-dip galvanized coil, hot-dip galvalume coil, zinc-aluminum-magnesium coil and other substrates. The substrates go through degreasing and chemical conversion treatment, then are coated with one or multiple layers of organic coatings via roll coating, and finally baked and cured at high temperature to form finished coated metal coils.
2. Substrate Types & Properties
| Substrate Type | Double-sided Coating Weight | Key Features | Application Scenarios |
|---|---|---|---|
| Hot-dip Galvanized (GI) | 180-275g/㎡ | Cost-effective, good coating adhesion, regular anti-corrosion performance | Interior wall panels, home appliances, general factory buildings |
| Hot-dip Galvalume (GL) | 150-220g/㎡ | 2-3 times higher corrosion resistance than galvanized steel, excellent heat resistance | Exterior wall & roof panels, high-corrosion areas such as coastal regions |
| Zinc-Aluminum-Magnesium (ZM) | 100-180g/㎡ | Self-healing at cut edges, superior corrosion resistance and high hardness | Photovoltaic brackets, livestock facilities, high-grade buildings |
| Cold Rolled (CR) | - | Smooth surface, excellent workability, requiring enhanced coating protection | Interior decoration, furniture, internal parts of home appliances |
3. Coating System (Topcoat + Primer + Backcoat)
3.1 Main Topcoat Types (Determine Weather Resistance & Service Life)
Polyester (PE): General-purpose type with low cost and good workability. Outdoor service life: 8-10 years. Suitable for ordinary factory buildings and interior panels.
Silicon Modified Polyester (SMP): Good heat resistance and chalking resistance. Outdoor service life: 12-15 years. Ideal for high-temperature workshops, roof and wall panels.
High Durability Polyester (HDP): Outstanding UV resistance and weatherability. Outdoor service life: 15-20 years. Applied in coastal areas and industrial zones.
Polyvinylidene Fluoride (PVDF): Ultra-high weather resistance and corrosion resistance. Outdoor service life: over 25 years. Used for high-end buildings, airports, stadiums, etc.
Self-cleaning Coating (HPC): Hydrophobic and anti-fouling surface with low maintenance demand. Suitable for curtain walls and public buildings.
3.2 Coating Structure
2/1 Coating: Two layers of topcoat and one layer of backcoat with twice baking process, widely used for general construction.
2/2 Coating: Two layers of topcoat and two layers of backcoat with twice baking process, for double-side usage and heavy anti-corrosion requirements.
3/2 Coating: Three layers of topcoat and two layers of backcoat with three times baking process, adopted for ultra-high weather resistance and high-end projects.
3.3 Coating Thickness
Topcoat: 15-25μm (standard: 20μm)
Primer: 5-8μm (improves adhesion and anti-corrosion performance)
Backcoat: 5-15μm (surface protection & identification)
4. Main Specifications (Customizable)
Thickness: 0.13-1.5mm (common range: 0.3-0.8mm)
Width: 800-1300mm (common size: 1000mm / 1200mm)
Coil Weight: 3-8 tons per coil (standard: 4-5 tons)
Inner Diameter: 508mm (20 inches), 610mm (24 inches)
Color: Standard colors (Ocean Blue, Off-white, Brick Red); Custom colors (Scarlet, Ivory White, Porcelain Blue and hundreds of other options)
5. Production Process
Uncoiling → Degreasing → Chemical Conversion Treatment (Chromating / Chromium-free Passivation) → Primer Coating & Baking → Topcoat Coating & Baking → Cooling → Quality Inspection → Rewinding → Packaging
6. Product Performance
Corrosion Resistance: Dual protection of substrate and coating, service life 1.5-3 times longer than ordinary galvanized steel sheets.
Decorative Effect: Rich and uniform colors. Embossing, printing and textured finishes are available.
Workability: Excellent bending, stamping, shearing and welding performance, applicable to cold forming.
Heat Resistance: SMP and PVDF coatings can withstand 120-180℃ without discoloration.
Environmental Friendliness: Low-VOC coatings, recyclable materials, complying with environmental protection standards.
7. Main Application Fields
Construction Industry: Factory buildings, warehouses, roofing, wall cladding, curtain walls and steel structure enclosures.
Home Appliance Industry: Shells of air conditioners, washing machines, refrigerators, microwave ovens and other appliances.
Transportation Industry: Carriage panels, containers, guardrails and ship interior parts.
Others: Advertising signs, furniture, ventilation ducts, photovoltaic brackets, livestock equipment, etc.
8. Executive Standards
National Standard of China: GB/T 12754-2019 Color Coated Steel Sheet and Strip
American Standard: ASTM A755
European Standard: EN 10169
9. Packaging, Storage & Transportation
Packaging: Wrapped with anti-rust paper and plastic film, reinforced with steel edge protectors for moisture-proof and scratch-proof purpose.
Storage: Store indoors in dry and ventilated areas. Avoid direct sunlight and rain. Do not stack coils heavily.
Transportation: Keep goods dry and prevent collision. Avoid scratches from sharp objects.
10. Quality Assurance
The coating adhesion, hardness, salt spray resistance and weather resistance fully comply with national standards and contractual requirements.
Material test certificates including substrate, coating weight, coating type, dimensions and inspection reports will be provided.
Warranty Period: 5 years for PE coating, 10 years for SMP coating, 15 years for HDP coating and 20 years for PVDF coating (excluding damage caused by human factors and harsh extreme environments).
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