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Help CenterSteel Coil & Strip & Color Coated Steel Coil，Z80/Z120/Z180/Z275，AZ100/AZ150
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1. Product Definition
Color Coated Coil (also known as color steel coil/color plate) takes hot-dip galvanized steel (GI), galvalume steel (GL), zinc-aluminum-magnesium coated steel (ZAM) or cold-rolled steel (CR) as the base substrate. Through degreasing, cleaning and chemical conversion treatment, it is coated with one or more layers of organic coating by continuous roller coating process, then baked and cured at high temperature to form a metal composite material. It integrates the strength of steel, anti-corrosion performance and decorative effect of coating, also named pre-painted steel coil.
2. Product Structure (Five Layers)
Base Substrate: Provides mechanical strength and basic anti-corrosion performance; mainstream materials and models: GI (hot-dip galvanized steel), GL (galvalume steel, 55%Al+43.4%Zn+1.6%Si), ZAM (zinc-aluminum-magnesium coated steel), CR (cold-rolled steel). Common substrate specifications: thickness 0.30–1.20mm, width 1000/1200/1250/1500mm.
Chemical Conversion Layer: Material: Chromate-free passivation layer (environmentally friendly type) or chromate passivation layer; acts as a bonding bridge between substrate and coating, improving adhesion and corrosion resistance. Thickness: 0.5–1.0μm.
Primer Layer: Main materials: Epoxy resin (EP) or polyurethane (PU); contains anti-rust pigment (such as zinc phosphate), enhancing anti-corrosion ability and interlayer adhesion. Model: EP-100 (epoxy primer), PU-200 (polyurethane primer); thickness: 5–8μm.
Topcoat Layer: Determines color, gloss, weather resistance and processing performance; mainstream materials, models and specifications:
PE (Polyester): Model PE-300; thickness 20–25μm; gloss 60±5° (glossy type), 30±5° (matte type)
SMP (Silicon Modified Polyester): Model SMP-400; thickness 20–25μm; gloss 50±5°
HDP (High Durability Polyester): Model HDP-500; thickness 22–27μm; gloss 40±5°
PVDF (Polyvinylidene Fluoride): Model PVDF-600; thickness 25–30μm; gloss 30±5° (matte type) or 60±5° (glossy type)
Back Coating Layer: Prevents backside corrosion; main materials: Epoxy resin (EP) or polyester (PE); models: EP-B100 (epoxy backcoat), PE-B200 (polyester backcoat); thickness: 5–10μm; common processes: 2/1 (2 coats top, 1 coat bottom), 2/1M (2 coats top, 1 coat bottom with film), 2/2 (2 coats top & bottom).
3. Base Substrate Types, Models & Coating Parameters
Substrate Type |
Model |
Coating Material |
Double-sided Coating Weight |
Substrate Thickness |
Applicable Environment |
|---|---|---|---|---|---|
Hot-dip Galvanized Steel |
GI-80/GI-120/GI-180/GI-275 |
Zinc (Zn) |
80/120/180/275g/㎡ |
0.30–1.20mm |
Inland, ordinary industrial environments |
Galvalume Steel |
GL-100/GL-150 |
55%Al + 43.4%Zn + 1.6%Si |
100/150g/㎡ |
0.30–1.20mm |
Coastal, chemical medium-corrosion areas |
Zinc-Aluminum-Magnesium Coated Steel |
ZAM-100/ZAM-150 |
Zn-Al-Mg alloy (Zn: 60–70%, Al: 20–30%, Mg: 1–3%) |
100/150g/㎡ |
0.30–1.20mm |
Photovoltaic, animal husbandry, high-humidity, high-corrosion areas |
Cold-Rolled Steel |
CR-030/CR-040/CR-050 |
No metal coating |
— |
0.30–0.60mm |
Indoor, low-corrosion occasions requiring bending processing |
4. Main Topcoat Types, Models, Weather Resistance & Service Life
Topcoat Type |
Model |
Material |
Coating Thickness |
Service Life |
Gloss |
Applicable Scenarios |
|---|---|---|---|---|---|---|
PE Polyester |
PE-300 |
Polyester resin |
20–25μm |
7–10 years |
60±5° (glossy), 30±5° (matte) |
Inland factory buildings, home appliance shells |
SMP Silicon Modified Polyester |
SMP-400 |
Silicon modified polyester resin |
20–25μm |
10–15 years |
50±5° |
Industrial factory roofs, wall panels |
HDP High Durability Polyester |
HDP-500 |
High weather-resistant polyester resin |
22–27μm |
15–20 years |
40±5° |
Coastal areas, polluted areas |
PVDF Polyvinylidene Fluoride |
PVDF-600 |
PVDF resin (with acrylic resin modification) |
25–30μm |
20–30 years |
30±5° (matte), 60±5° (glossy) |
High-end buildings, public facilities, landmark projects |
5. General Specification Parameters
Thickness: 0.30–1.20mm (common models: 0.4mm, 0.5mm, 0.6mm; tolerance: ±0.02mm)
Width: 1000mm, 1200mm, 1250mm, 1500mm (custom slitting available, width tolerance: ±1mm); coil inner diameter: 508mm, outer diameter: 1200–1500mm
Coating Thickness: Topcoat 20–30μm, Primer 5–8μm, Back coating 5–10μm (tolerance: ±2μm)
Color: Standard colors (model: RAL 5010, RAL 7035, RAL 3001, RAL 1015, RAL 5015, etc.); custom colors available according to RAL color card or customer sample
Surface Finish: Glossy (model: G), Matte (model: M), Embossed (model: E, such as diamond pattern, ripple pattern), Printed (model: P), Film-laminated (model: F, PE film or PVC film)
Mechanical Performance: Tensile strength: ≥345MPa (GI/GL/ZAM), ≥235MPa (CR); Elongation: ≥20%; Bending performance: ≥180° (no cracking, coating no peeling)
6. Production Process (Continuous Roller Coating)
Uncoiling → Degreasing & Cleaning (degreasing agent: alkaline aqueous solution, cleaning temperature: 40–60℃) → Chemical Conversion (passivation solution: chromate-free passivation agent, processing time: 3–5s) → Roller Coating (Primer + Topcoat + Back Coating, roller speed: 30–50m/min) → High-temperature Curing (180–240℃, curing time: 2–3min) → Cooling (water cooling + air cooling) → Rewinding (tension: 500–800N) → Packaging; Main processes: 2/1 (2 coats top, 1 coat bottom) , 2/2 (2 coats top & bottom).
7. Core Features
Light weight & High strength: 30%–50% lighter than traditional building materials (density: 7.85g/cm³), meets structural strength requirements for various scenarios.
Durable Anti-corrosion: Coating effectively isolates air, water and corrosive media; service life is 1.5–3 times that of galvanized steel; salt spray test: ≥1000h (GI+PE), ≥2000h (GL+HDP), ≥3000h (ZAM+PVDF).
Rich Color Options: Dozens of standard RAL colors, excellent color retention (ΔE ≤2 after 1000h UV aging test), good decorative effect.
Excellent Processability: Supports bending, stamping, shearing and punching; can be processed into various shapes on site without damaging the coating.
Economical & Eco-friendly: No later painting required, low maintenance cost (maintenance cycle: 5–10 years); 100% recyclable, in line with environmental protection standards.
8. Main Applications
Construction: Roof & wall panel of industrial workshops, warehouses, stadiums (model recommendation: GL-150+HDP-500, thickness 0.5–0.6mm); steel structure enclosure, clean room (model recommendation: ZAM-100+PE-300, thickness 0.4–0.5mm); curtain wall (model recommendation: ZAM-150+PVDF-600, thickness 0.6–0.8mm).
Home Appliances: Shells of refrigerator, washing machine, air conditioner (model recommendation: CR-030/CR-040+PE-300, thickness 0.3–0.4mm); microwave oven panel, cabinet chassis (model recommendation: GI-80+EP-100+PE-300, thickness 0.4mm).
Transportation: Carriage board (model recommendation: GL-100+SMP-400, thickness 0.6–0.8mm); rolling shutter door, municipal fence, road sign board (model recommendation: GI-120+PE-300, thickness 0.5mm).
New Energy: Photovoltaic support (model recommendation: ZAM-100+HDP-500, thickness 0.5mm); energy storage equipment shell, wind power interior parts (model recommendation: GL-150+PVDF-600, thickness 0.6mm).
Others: Furniture, office partition (model recommendation: CR-040+PE-300, thickness 0.4mm); decorative board, pipeline insulation shell (model recommendation: GI-80+PE-300, thickness 0.4mm).
9. Quality Standards (National/Industry Standards)
GB/T 12754-2019 Color coated steel sheet and strip (national standard)
GB/T 13912-2020 Metallic coatings - Hot-dip galvanized coatings on fabricated iron and steel articles (national standard)
GB/T 15970.9-2019 Corrosion of metals and alloys - Salt spray test (national standard)
ASTM A755/A755M (American standard), EN 10169 (European standard) (optional for export products)
10. Selection Suggestions
By Environment: Inland areas: PE-300 + GI-120/GI-180; Coastal areas: HDP-500/PVDF-600 + GL-150; Chemical industrial areas: PVDF-600 + ZAM-150.
By Thickness: Roof panel: 0.5–0.6mm (model: 0.5mm, 0.6mm); Wall panel: 0.4–0.5mm (model: 0.4mm, 0.5mm); Home appliance: 0.3–0.4mm (model: 0.3mm, 0.4mm); Curtain wall: 0.6–1.0mm (model: 0.6mm, 0.8mm).
By Coating Lifespan: Ordinary projects: PE-300 (7–10 years); Medium-long term projects: SMP-400/HDP-500 (10–20 years); Landmark & permanent buildings: PVDF-600 (over 20 years).
11. Packaging & Storage
Packaging: Inner layer: waterproof paper; middle layer: plastic film (moisture-proof); outer layer: galvanized iron sheet; both ends: iron corner protector (model: 50×50×5mm) to prevent collision. Packaging specification: Coil weight: 2–5 tons/coil; packaging type: vertical packaging (standard) or horizontal packaging (custom).
Storage: Store in a dry and ventilated warehouse, temperature 5–30℃, relative humidity ≤60%; avoid direct sunlight, rain and heavy pressure; stacking layers: ≤3 layers (horizontal stacking) or vertical placement (vertical stacking); avoid contact with corrosive substances (such as acid, alkali) to prevent coating damage and substrate corrosion.
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