G90 Galvanized Sheet

G90 galvanized steel sheet is a premium hot-dip galvanized (HDG) product offering ‌275g/m² total zinc coating‌ (0.90 oz/ft² per ASTM A653), delivering ‌1,500+ hours of salt spray resistance‌ (ISO 9227). Designed for structural and outdoor applications, this material combines extreme durability with cold-forming versatility. Compliant with ‌ASTM A653‌, ‌EN 10346‌, and ‌JIS G3302‌ standards, G90 outperforms standard galvanized grades in coastal, industrial, and high-humidity environments.

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Product Introduction

‌G90 Galvanized Steel Sheet: Heavy-Duty Corrosion Resistance for Demanding Environments


‌Product Overview‌

G90 galvanized steel sheet is a premium hot-dip galvanized (HDG) product offering ‌275g/m² total zinc coating‌ (0.90 oz/ft² per ASTM A653), delivering ‌1,500+ hours of salt spray resistance‌ (ISO 9227). Designed for structural and outdoor applications, this material combines extreme durability with cold-forming versatility. Compliant with ‌ASTM A653‌, ‌EN 10346‌, and ‌JIS G3302‌ standards, G90 outperforms standard galvanized grades in coastal, industrial, and high-humidity environments.


‌Technical Specifications‌

‌1. Base Material & Dimensions‌

  • ‌Thickness‌: 0.12mm (precision electronics) to 6.00mm (structural beams) with ±0.02mm tolerance
  • ‌Width‌: 600–1,500mm (optimized for roll-forming automation)
  • ‌Coating Structure‌:
    • Pure Zinc Layer: 80% of total coating (220g/m²)
    • Zinc-Iron Alloy Layers: Gamma (Fe₃Zn₁₀), Delta (FeZn₇), Zeta (FeZn₁₃) phases

‌2. Coating Performance‌

Parameter G90 (ASTM) Z275 (EN) Equivalent
Total Zinc Weight 275g/m² 275g/m² 18.5µm/side
Salt Spray Resistance 1,500hrs 1,200hrs ISO 9227
Thermal Stability Stable to 315°C Loses 5% coating at 400°C

‌Mechanical Properties‌

Grade Yield Strength (MPa) Tensile Strength (MPa) Elongation (A80%) Bendability*
DX54D+G90 120–220 260–350 ≥36% 0t (180°)
S350GD+G90 ≥350 ≥420 ≥16% 1t (90°)
SGCC+G90 140–300 270–420 ≥26% 0.5t (180°)

*Minimum bend radius relative to thickness


‌Manufacturing Process‌

  1. ‌Hot-Dip Galvanizing‌:
    • Steel cleaning: 3-stage alkaline degreasing (pH 13, 80°C)
    • Continuous annealing: 720°C in 15% H₂ + 85% N₂ atmosphere
    • Zinc bath immersion: 455°C with 0.15–0.25% aluminum content
    • Air-knife precision: Maintains ±3% coating uniformity
  2. ‌Post-Treatment Options‌:
    • ‌Code Q (Phosphate+Oiling)‌: 1.5–3.0g/m² oil film (Ra 0.8µm)
    • ‌Code S (Sealed Chromate)‌: 0.5µm layer with 85% humidity resistance

‌Environmental Adaptability‌

Exposure Scenario Recommended Solution Service Life*
Coastal bridges G90 + 75µm fluoropolymer 30+ years
Automotive chassis G90 + e-coating (20µm) 15–20 years
Grain silos G90 + 50µm epoxy 25–30 years

*Based on ISO 12944-5 corrosion category C5-M


‌Forming & Fabrication Guide‌

  1. ‌Stamping Performance‌:
    • Deep drawing limit: LDR 2.1 (1.5mm sheet)
    • Progressive die speed: 45 strokes/min (0.8mm material)
  2. ‌Welding Parameters‌:
    • Spot welding: 7kA current, 0.3s duration (1.2mm sheets)
    • Laser welding: 4kW power at 8m/min (N₂ shielding gas)
  3. ‌Surface Finishes‌:
    • ‌Zero Spangle‌: Ra 0.4µm (Suitable for Class A automotive paint)
    • ‌Tight Spangle‌: 50–100µm crystals (Architectural exposed surfaces)

‌Chemical Composition‌

Element DX51D+G90 S350GD+G90 SGCC+G90
Carbon ≤0.12% ≤0.20% ≤0.15%
Manganese ≤0.60% ≤1.70% ≤0.60%
Phosphorus ≤0.025% ≤0.025% ≤0.030%

Low carbon content enables superior weldability (Ceq ≤0.35).


‌Competitive Advantages‌

  • ‌Corrosion Resistance‌: 2× better than Z275 in cyclic salt fog tests
  • ‌Cost Efficiency‌: 40% cheaper than 316 stainless steel in C4 environments
  • ‌Sustainability‌: 92% recycled steel content, 97% zinc reclamation rate

‌Industry Applications‌

  1. ‌Construction‌:
    • Solar panel mounting systems (2.0mm G90 withstands 2,500Pa wind loads)
    • Prefabricated steel buildings (6.0mm columns with 550MPa tensile strength)
  2. ‌Transportation‌:
    • Truck trailer floors (3.0mm G90 + diamond plate pattern)
    • Railway signal cabinets (1.5mm with IP65-rated seams)
  3. ‌Energy‌:
    • Wind turbine towers (6.0mm G90 + 200µm polyurethane coating)
    • Utility transformer housings (2.3mm with RFI shielding)

‌Quality Assurance‌

  • Third-party verified coating adhesion: ≤3% loss in 10T bend tests
  • Surface defects: ≤2 pinholes/m² (Class I per EN 10169)
  • Spangle consistency: 85% uniform crystal distribution

Product Show

G90 Galvanized Sheet supplier

Luo Kaiwei Steel Company is a comprehensive steel supplier that produces a variety of carbon steel plates, carbon steel pipes, galvanized steel, carbon steel coils, and steel profiles.

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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