Introduction
Color-coated steel coil is a composite material made by applying an organic paint to a steel strip after degreasing and phosphating, then baking it.
| Tolerance | ±1% |
| Zinc coating | 30-275g/m2, according to customer's requirement |
| Standard | ASTM, DIN, JS, BS, GB/T |
| Certificate | JIS, ISO9001, API , BIS, Gs |
| Surface | Hot-dip Galvanized |
| RAL Color | Can be customized |
| Length | Customized(1-30t/coil) |
| Width | 50cm-2.2m or as required |
| Thickness | 0.1-10mm or as required |
| Technique | Hot-dipped galvanized |
| Applications | House, Bridge, Transmission tower, Ship, Industrial furnace |
Features
- Corrosion Resistance
Use high-quality cold-rolled steel to ensure excellent flatness or galvanized steel (zinc layer 60-275 g/m²) to enhance corrosion resistance.
- Superior UV Resistance and Weatherability
Adopt polyester, PVDF, or silicone-modified polyester coatings. PVDF coating offers superior UV resistance (ΔE ≤3 after 3000h UV testing) and weatherability.
- Stable Protective
The coated steel strip enters the curing furnace and is baked at 200-250°C to crosslink and cure the organic coating (such as polyester, PVDF, etc.), forming a stable protective and decorative layer.
Mechanical performance indicators
The mechanical properties of color-coated steel coils mainly depend on the base material and processing technology. Common base materials include Q235, SGCC (hot-dip galvanized base material), DX51D+Z, etc. The core performance indicators are as follows:
| Performance Indicators | Testing Standard | Typical Value Range | ||||
| Yield Strength (Rp0.2) | GB/T 228 | 20-350 MPa (adjusted according to base material grade) | ||||
| Tensile Strength (Rm) | GB/T 228 | 300-500 MPa | ||||
| Elongation (A) | GB/T 228 | ≥15% (cold-rolled base material); ≥10% (hot-rolled base material) | ||||
| Coating Adhesion | GB/T 5270 | Checked by the cross-cut method, coating detachment grade ≤ 1 | ||||
| Impact Resistance | GB/T 1732 |
500 g hammer impact from a height of 50 cm, no coating cracking or detachment |
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| Bending Resistance | GB/T 1731 | 180° bending (bending radius = 2 × base material thickness), no coating cracking | ||||
Customization Options
- Coil Dimensions
Using precision flattening machines, we uncoil large steel coils into flat sheets with custom lengths (1–6 m) and coil-matched widths. For clients requiring more manageable sizes, we can roll them into smaller rolls with tailored inner diameters (508 mm/610 mm) and weights (500–2000 kg).
One-stop processing-including uncoiling, cutting, and recoiling-is available to fit your workflow.
- Color Options
Provide over 60 standard colors (complying with RAL/Pantone) and custom color matching, ensuring the steel coils align with your brand or project aesthetic.
- Flexible Size Customization
To meet diverse manufacturing and project requirements, we provide flexible customization for key dimensions.
FAQ
Q: What is the manufacturing process of color-coated sheet rolls?
A: The production follows a complete process chain: substrate feeding → surface pretreatment → coating application → baking and curing → cooling and inspection → rewinding and packaging
Q: What is the purpose of the degreasing process?
A: Degreasing typically uses alkaline washing or electrolytic cleaning to remove oil, dust, and other impurities from the steel surface, improving coating adhesion.
Q: What is phosphating or passivation in the coating process?
A: Phosphating or passivation forms a dense protective film on the substrate surface, which helps isolate air, reduce oxidation, and enhance the bonding strength between the coating and the steel base.
Q: How is the coating applied to the steel strip?
A: The coating is usually applied through roll coating (the mainstream process) or spraying. Depending on the product requirements, single-sided or double-sided coating can be applied.
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