Prepainted Galvanized Steel Sheet

Prepainted galvanized steel sheets are zinc-coated substrates (60-275g/m²) with factory-applied paint systems, combining corrosion resistance with aesthetic versatility. Manufactured via continuous hot-dip galvanizing (HDG) or electrogalvanizing (EG) processes, these sheets feature PVDF, polyester, or silicone-modified coatings in 30+ RAL colors. Ideal for roofing, appliances, and automotive parts, they deliver 15-25 years service life at 40% lower cost than stainless steel alternatives.

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Product Introduction

‌Prepainted Galvanized Steel Sheets: High-Performance Coated Metal for Industrial & Architectural Applications‌


‌What is Prepainted Galvanized Steel?‌

Prepainted galvanized steel sheets are zinc-coated substrates (60-275g/m²) with factory-applied paint systems, combining corrosion resistance with aesthetic versatility. Manufactured via continuous hot-dip galvanizing (HDG) or electrogalvanizing (EG) processes, these sheets feature PVDF, polyester, or silicone-modified coatings in 30+ RAL colors. Ideal for roofing, appliances, and automotive parts, they deliver 15-25 years service life at 40% lower cost than stainless steel alternatives.


‌Key Advantages‌

1️⃣ ‌Dual-Layer Protection‌

  • Base Layer: Zinc coating (Z80-Z275) prevents substrate corrosion
  • Top Layer: 20-30μm polymer coating resists UV/chemical degradation

2️⃣ ‌Precision Manufacturing‌

  • Thickness tolerance: ±0.02mm (0.12-6mm range)
  • Automated edge trimming (600-1500mm width)

3️⃣ ‌Sustainable Solution‌

  • 85% recycled steel content
  • REACH-compliant coatings (VOC <50g/L)

‌Technical Specifications‌

‌1. Material Grades & Standards‌

Grade (EN 10346) Coating Type Yield Strength Paint Adhesion
DX51D+Z HDG + Polyester 140-260 MPa Class 1 (ISO 2409)
S350GD+Z HDG + PVDF 350 MPa Class 0 (No peel)
SGCC (JIS G3302) EG + SMP 220 MPa Class 2

PVDF Coating Performance: 40% gloss retention after 10,000hr QUV test

‌2. Critical Dimensions‌

  • ‌Thickness‌: 0.3mm (lightweight cladding) to 6mm (structural panels)
  • ‌Corrugation Types‌:
    • Wave Height: 15-50mm (AS 1397 compliant)
    • Pitch: 75-200mm

‌Production Process‌

  1. ‌Continuous Galvanizing Line (CGL)‌
    • Zinc bath temperature: 460°C ±5°C
    • Coating control: Air knife system (±3g/m² accuracy)
  2. ‌Coating Stage‌
    • Primer: Chromate conversion coating (1-3μm)
    • Topcoat: 2-coat wet-on-wet application (15μm+25μm)
  3. ‌Curing‌
    • Oven temperature: 220-250°C (PMT)
    • Line speed: 80-120m/min

‌Performance Comparison‌

Parameter Prepainted HDG Electrogalvanized Aluminum
Salt Spray Resistance 1,500hrs 500hrs 300hrs
Thermal Conductivity 50 W/mK 50 W/mK 237 W/mK
Cost/m² (0.5mm) $12.8 $9.5 $28.7

‌Application Guide‌

‌Architectural‌

  • Roofing: SMP-coated Z275 sheets (50-year color warranty)
  • Facades: PVDF-coated Z180 (meets AAMA 2605 standard)

‌Industrial‌

  • Appliance Housings: EG-coated DX53D (deep-drawing capability)
  • Automotive: HDG S550GD (HSLA grade for structural parts)

‌Quality Assurance‌

  • ‌Coating Tests‌:
    • Cross-cut adhesion (ASTM D3359)
    • T-bend flexibility (ASTM D4145)
  • ‌Certifications‌:
    • ISO 9001:2015
    • LEED v4.1 MR Credit

‌Installation Best Practices‌

  1. ‌Storage‌: Stack vertically with PE separators
  2. ‌Cutting‌: Laser/plasma preferred (debris-free edges)
  3. ‌Fastening‌: Stainless steel screws with EPDM washers

 


‌Environmental Impact‌

Our production achieves 35% energy reduction through:

  • Regenerative thermal oxidizers (95% VOC destruction)
  • Closed-loop water cooling systems

‌Why Choose Prepainted Sheets?‌

  1. ‌Custom Solutions‌: Available in camouflage/woodgrain patterns
  2. ‌Global Compliance‌: Meets ASTM A755 (US), GB/T 12754 (CN), KS D3506 (KR)
  3. ‌Fast Turnaround‌: 10-day production lead time for standard colors

‌Industry Fact‌: Over 70% of modern warehouse roofs in Southeast Asia use prepainted Z275 sheets for typhoon resistance (up to 200km/h wind rating).


For projects requiring enhanced fire resistance, specify our A2-s1,d0 fire-rated sheets meeting EN 13501-1 standards.

Product Show

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Luo Kaiwei Steel Company is a multi-ISO certified steel manufacturer specializing in carbon steel plates, pipes and galvanized coils since 2010. Competitive prices and ASTM/JIS compliant. Get instant quotes for bulk orders and global shipping support.

Tel: +86 15635685959

E-mail: [email protected]  

WhatsApp: +86 18912200505

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