Prepaint steel coil are composite materials made by applying one or more layers of organic coating (e.g., polyester, PVDF) onto a base material (hot-dip galvanized, galvalume, or electrogalvanized steel) after surface pre-treatment (chemical degreasing and conversion coating). They combine the mechanical strength of steel with the decorative and corrosion-resistant properties of organic coatings, widely used in construction, home appliances, advertising, furniture, and transportation industries.
Key Features
Standards:
Domestic: GB/T 12754-2006 (Color-Coated Steel Sheets and Strips).
International: ASTM A653, EN 10142 (European Standard), JIS G3302 (Japanese Standard).
Materials:
Base Material: Hot-dip galvanized steel (SPCC), galvalume steel (G90-G275g/m²), electrogalvanized steel.
Coating Types:
Polyester (PE): Cost-effective, suitable for general environments.
Silane-Modified Polyester (SMP): Excellent dirt resistance, ideal for outdoor construction.
Polyvinylidene Fluoride (PVDF): High weather resistance (UV aging >10,000 hours ΔE≤6), suitable for extreme climates.
High-Durability Polyester (HDP): Balances cost and weather resistance.
Dimensions:
Thickness: 0.12–1.5mm (common 0.476mm specification).
Width: 600–1250mm (standard coils) or custom-shaped sheets.
Length: Customizable, up to 12 meters.
Applications:
Construction: Industrial factory roofs, light steel villa facades (wood-grain printed color-coated steel), chemical plant workshops (galvalume base for enhanced corrosion resistance).
Home Appliances: Refrigerator side panels (PCM color-coated steel), washing machine inner drums.
Advertising: Signage, LED light boxes.
Transportation: Highway noise barriers, subway car interiors.
Others: Clean engineering (antibacterial color-coated steel), packaging containers.
Certifications:
Classification Society Certifications: ABS, BV, DNV, LR, NK, CCS (meet offshore platform and shipbuilding requirements).
Owner/Engineering Firm Certifications: ISO 9001, API Q1, ASME SA653, GB/T 12754-2006.
Common Customer Questions (Q&A Format)
Q: How to choose the right coating type?
A: General construction/appliances: Select polyester (PE) or silane-modified polyester (SMP).
High-weather environments (e.g., coastal areas): Choose polyvinylidene fluoride (PVDF).
Cost-sensitive needs: Select electrogalvanized base + polyester coating.
Q: What is the corrosion resistance performance?
A: Passes 240-hour 30% hydrochloric acid immersion test without blistering, and remains stable in industrial ammonia environments. Galvalume base offers 3x higher corrosion resistance than pure zinc-coated steel.
Q: Does customization of colors and textures supported?
A: Yes, wood grain, stone grain, and metallic textures are available. Provide Pantone color codes or samples for matching.
Q: How to prevent coating damage during transportation/storage?
A: Use PE film + steel drum packaging to avoid pressure and friction. Store at -10°C to 50°C.
Q: What is the weather resistance test result?
A: PVDF coating passes >10,000 hours UV aging with ΔE≤6; polyester coating typically achieves 5,000 hours ΔE≤8.
Q: Are environmental certifications provided?
A: Yes, products comply with RoHS 2.0 and REACH regulations, with SGS reports available for low VOC emissions.
Q: What is the lead time?
A: 20–30 days for standard specifications, 45–60 days for custom orders, depending on order volume.
Q: How to resolve coating bubbling or cratering issues?
A: Bubbling may result from insufficient baking temperature or impure primer cooling water; cratering requires checking steel surface cleanliness and coating viscosity.
Q: What precautions are needed during welding?
A: Recommend CO₂ shielded arc welding or TIG welding with preheating at 100–150°C to reduce coating vapor effects on weld quality.
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