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Help CenterSteel Coil & Strip & Color Coated Steel Coil，GB/T 12754-2019, EN 10169, ASTM A755
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Steel Coil & Strip & Color Coated Steel Coil，GB/T 12754-2019, EN 10169, ASTM A755NegotiableMOQ: 5 Metric Tons -
Steel Coil & Strip & Color Coated Steel Coil，GB/T 12754-2019, EN 10169, ASTM A755NegotiableMOQ: 5 Metric Tons
-
Steel Coil & Strip & Color Coated Steel Coil，GB/T 12754-2019, EN 10169, ASTM A755NegotiableMOQ: 5 Metric Tons
-
Steel Coil & Strip & Color Coated Steel Coil，GB/T 12754-2019, EN 10169, ASTM A755NegotiableMOQ: 5 Metric Tons
-
Steel Coil & Strip & Color Coated Steel Coil，GB/T 12754-2019, EN 10169, ASTM A755NegotiableMOQ: 5 Metric Tons
1. Product Overview
Color coated coil, also known as pre-painted steel coil, is a composite metal material manufactured by taking high-quality metal steel strip as the substrate. The substrate goes through degreasing, water washing and chemical passivation, then is roller-coated with special organic paint on both sides and cured by high-temperature baking.
It combines the mechanical strength of metal with the anti-corrosion and decorative properties of organic coating. Featuring light weight, high strength, rich colors, excellent weather resistance and corrosion resistance, it requires no secondary painting. The product can be bent, roll-formed, punched and sheared for further processing, and is widely used in construction, home appliances and industrial manufacturing.
Executive Standards: GB/T 12754-2019, EN 10169, ASTM A755Lead Time: 5–7 days
2. Full Material Composition
The color coated coil adopts a three-layer composite structure: metal substrate + alloy anti-corrosion coating + organic topcoat. The detailed material specifications are as follows:
2.1 Substrate Material
The substrate is made of high-quality cold-rolled low-carbon steel strip with pure texture, good toughness and excellent workability. Main steel grades are listed below:
Commercial Grade: SPCC, DC01, Q195. Soft texture with superior formability, suitable for conventional bending and roll forming, applied to civil buildings and home appliance interiors.
Structural Grade: SGCC, DX51D, Q235. Moderate strength and high stability, universal for most steel structure workshops and stadium projects.
High-Strength Structural Grade: DX52D, DX53D, G550. High yield strength and rigidity, not easy to deform. Ideal for long-span roof panels, photovoltaic brackets and load-bearing wall panels.
2.2 Coating Material (Anti-corrosion Intermediate Layer)
Alloy coating is applied on the substrate to isolate air and moisture and prevent rusting.
| Coating Type | Main Material Composition | Coating Weight | Material Features | Application |
|---|---|---|---|---|
| Hot-Dip Galvanized (GI) | Over 99% pure zinc | 80–275 g/㎡ | Stable material, strong adhesion and cost-effective with basic anti-corrosion performance | Inland workshops, warehouses and ordinary civil buildings |
| Hot-Dip Aluzinc (GL) | 55% Aluminum + 43.4% Zinc + 1.6% Silicon Alloy | 100–150 g/㎡ | Aluminum provides high temperature resistance and oxidation resistance; Zinc ensures anti-corrosion; Silicon improves coating adhesion. Its corrosion resistance is 2-5 times that of ordinary galvanized steel | Coastal areas, humid environments and high-end outdoor projects |
| Zinc-Aluminum-Magnesium Alloy Coated (ZM) | Zinc-Aluminum-Magnesium Ternary Alloy | 60–180 g/㎡ | Self-repair for scratches, dense coating, scratch resistance and acid & alkali resistance with outstanding durability | Livestock farms, chemical plants, photovoltaic brackets and highly corrosive industrial environments |
| Electro-Galvanized (EG) | High-purity electrolytic zinc | 20/20 g/㎡ | Uniform and smooth coating surface, suitable for precision processing | Home appliance shells, interior decoration and precision hardware parts |
2.3 Topcoat Material (Surface Decorative & Protective Layer)
The surface organic coating is made of special industrial paint, which is eco-friendly, high-adhesive, anti-chalking and colorfast.
| Coating Type | Code | Material Features | Service Life | Application |
|---|---|---|---|---|
| Polyester Paint | PE | Conventional polyester resin, bright color, good adhesion, cost-effective and flexible for deep processing | 5–10 years | Ordinary workshops, civil buildings and temporary projects |
| Silicon Modified Polyester Paint | SMP | Polyester modified with organosilicon, high hardness, anti-fouling, heat-resistant and wear-resistant with better color retention | 10–15 years | Urban commercial buildings and standard steel structure workshops |
| High Durability Polyester Paint | HDP | High weather resistance modified polyester, excellent UV resistance, anti-aging and anti-chalking performance | 15–20 years | Plateau, desert and open-air outdoor projects |
| Polyvinylidene Fluoride Paint | PVDF | High-end fluorocarbon resin, superior chemical stability, acid & alkali resistance, salt spray resistance and top-grade color retention | 20–25 years | Coastal high salt spray areas, chemical corrosion environments and high-end landmark buildings |
2.4 Auxiliary Materials
Passivation Layer: Chromated or chromium-free passivation solution, enhancing the bonding force between alloy coating and topcoat to avoid peeling and blistering, and further improve anti-corrosion performance.
Protective Film (Optional): PE transparent film, preventing scratches and abrasion during transportation and processing.
3. Coating System
3.1 Standard Coating Structure
2/1: 2 coats of topcoat + 1 coat of back paint (General standard type)
2/2: 2 coats of topcoat + 2 coats of back paint (High anti-corrosion type with double-sided protection)
2/1M: Double-sided coating with one-time baking (Economical type)
3.2 Coating Thickness
Topcoat: 15–25 μm (Standard: 20 μm)Back paint: 5–10 μmTotal coating thickness: 20–35 μm
3.2 Common Colors
Off-white, sky blue, brick red, royal blue, ivory white, silver grey, crimson and more. Custom colors per RAL color card are available.
4. Technical Specifications (Customizable)
Thickness: 0.22–2.0 mm (substrate thickness, excluding coating)
Width: 700–1550 mm (Common sizes: 800 mm, 1000 mm, 1250 mm)
Coil Weight: 3–10 tons (Standard: 5–8 tons)
Inner Diameter: 508 mm (20 inch) / 610 mm (24 inch)
Length: Custom cut-to-length (Common finished length after forming: 1.8–12 m)
5. Production Process
Uncoiling → Degreasing → Water Washing → Drying → Chemical Passivation → Topcoat Rolling → High-temperature Baking (180–220℃) → Back Paint Rolling → Baking → Cooling → On-line Inspection → Film Lamination → Slitting → Packaging
6. Main Performance Parameters
Mechanical Property: Yield strength 220–550 MPa (G550 high-strength grade available)
Coating Adhesion: 0T grade, no cracks or peeling after 180° bending
Salt Spray Resistance: PE ≥ 500h, SMP ≥ 1000h, PVDF ≥ 2000h (No rust or blistering)
Operating Temperature: -40℃ ~ 120℃, short-term resistance up to 150℃
7. Application
Construction: Roof panels, wall panels, cold storage panels, gymnasiums, warehouses and decorative curtain walls for steel structure buildings
Home Appliances: Refrigerator side panels, washing machine shells, air conditioner panels and small household appliance housings
Transportation: Carriage panels, container roof panels, road guardrails and rail transit interior panels
Others: Advertising boards, ventilation ducts, furniture panels, photovoltaic brackets and livestock fences
8. Packaging & Delivery
Packaging: Rust-proof paper + plastic waterproof film + steel corner protectors + steel strapping, for full protection against moisture, rust and scratches.
Delivery: Shipped from Tianjin Port with 5–7 days lead time. Services including full coil delivery, slitting, leveling and roll forming are available.
9. Quality Assurance
Full automatic on-line inspection is implemented to eliminate defects such as missing coating, bubbles, scratches and color difference. We can provide complete material certificates, salt spray test reports and factory inspection reports.
Warranty Period: PE for 5 years, SMP for 10 years, HDP for 15 years, PVDF for 20 years (Under normal natural environment).
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