Z275 Galvanized Sheet

Z275 galvanized steel sheet is a premium-grade carbon steel product featuring a ‌275g/m² zinc coating‌ applied via the continuous hot-dip galvanizing (HDG) process. Compliant with ‌ASTM A653, EN 10346‌, and ‌JIS G3302‌ standards, this material delivers ‌1,200+ hours of salt spray resistance‌ (ISO 9227), making it ideal for coastal infrastructure, heavy-duty industrial equipment, and automotive underbody components. The triple-layer zinc-iron alloy structure ensures sacrificial protection even when the surface is scratched, outperforming standard galvanized sheets by 300% in corrosion resistance.

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Product Introduction

‌Z275 Galvanized Steel Sheet: Superior Corrosion Protection for Demanding Environments


‌Product Overview‌

Z275 galvanized steel sheet is a premium-grade carbon steel product featuring a ‌275g/m² zinc coating‌ applied via the continuous hot-dip galvanizing (HDG) process. Compliant with ‌ASTM A653, EN 10346‌, and ‌JIS G3302‌ standards, this material delivers ‌1,200+ hours of salt spray resistance‌ (ISO 9227), making it ideal for coastal infrastructure, heavy-duty industrial equipment, and automotive underbody components. The triple-layer zinc-iron alloy structure ensures sacrificial protection even when the surface is scratched, outperforming standard galvanized sheets by 300% in corrosion resistance.


‌Technical Specifications‌

‌1. Base Material Properties‌

  • ‌Thickness‌: 0.12mm (ultra-thin electrical enclosures) to 6.00mm (structural beams) ±0.03mm tolerance
  • ‌Width‌: 600–1,500mm (compatible with roll-forming automation systems)
  • ‌Coating Weight‌:
    • ‌Z275‌: 275g/m² (38.5µm per side)
    • ‌G90 (ASTM Equivalent)‌: 0.90 oz/ft² total

‌2. Mechanical Performance‌

Grade Yield Strength (MPa) Tensile Strength (MPa) Elongation (A80%)
DX54D+Z275 120–220 260–350 ≥36%
S350GD+Z275 350 420 ≥16%
SGCD3+Z275 160–240 280–400 ≥32%

‌Advanced Coating Technology‌

The HDG process involves:

  1. ‌Cleaning‌: Alkaline degreasing at 70°C to remove mill oils
  2. ‌Annealing‌: Continuous furnace treatment at 720°C for optimal formability
  3. ‌Zinc Bath Immersion‌: 455°C molten zinc with 0.2% aluminum for spangle control
  4. ‌Air Knife Finishing‌: Precision coating thickness control (±3g/m²)

This creates a metallurgical bond between the zinc and steel substrate, achieving ‌6,500 hours to first red rust‌ in C5-M marine environments (ISO 12944).


‌Surface Treatment Options‌

Code Process Key Applications
C Chromate passivation Outdoor electrical cabinets
Q Phosphating + oiling Pre-painted roofing systems
S Sealed chromate + oiling Automotive chassis parts
PV PVDF coating (30µm) Architectural façades

‌Environmental Durability Guide‌

Exposure Condition Recommended Solution Service Life*
Indoor dry environments Z275 + oiling (Code O) 25–30 years
Coastal salt spray zones Z275 + PVDF coating 40+ years
Chemical processing plants Z275 + epoxy primer 15–20 years
High-abrasion mining equipment Z275 + ceramic coating 10–12 years

Based on ISO 14713-1 corrosion protection guidelines


‌Forming & Fabrication Advantages‌

  1. ‌Cold Bending Performance‌
    • Minimum bend radius: ‌0.5× thickness‌ (for 2mm sheet: R1.0mm)
    • Springback angle: ≤2° after 90° bending
  2. ‌Welding Compatibility‌
    • Resistance spot welding: 9–14kA current range
    • Laser welding speed: 5m/min (1.5mm thickness)
  3. ‌Punching & Stamping‌
    • Blank holder force: 15–25 tons (for 300mm dies)
    • Tool life improvement: 40% vs. Z180-coated sheets

‌Chemical Composition‌

Element C Mn P S Al
Content ≤0.15% ≤1.70% ≤0.025% ≤0.025% 0.15–0.22%

The low sulfur/phosphorus content minimizes hot cracking during welding, while aluminum additives refine zinc crystal structure for uniform coating.


‌Competitive Comparison‌

Feature Z275 Galvanized Aluminized Steel Galvalume
Salt spray resistance 1,200+ hours 800 hours 1,500 hours
Thermal resistance 200°C max 650°C 340°C
Conductivity 13% IACS 20% IACS 25% IACS
Cost per ton $1,100 $1,400 $1,250

‌Industry Applications‌

  1. ‌Renewable Energy‌
    • Solar farm mounting structures (Z275 + MPPO coating)
    • Wind turbine tower interiors
  2. ‌Transportation‌
    • Truck trailer floors (3mm Z275 withstands 20-ton loads)
    • Railway container doors
  3. ‌Construction‌
    • Seawall reinforcement panels
    • Industrial warehouse roofing (0.7mm Z275 + SMP coating)

‌Sustainability Features‌

  • 92% recycled content in steel substrate
  • Zinc recovery rate: 99.8% in closed-loop galvanizing plants
  • Water-based pretreatment systems (VOC emissions <15g/m²)

‌Logical Flow Enhancers‌:

  • For instance, coastal infrastructure projects benefit from Z275’s 40-year service life.
  • Moreover, the triple-layer zinc-iron alloy prevents underfilm corrosion.
  • In addition, automotive manufacturers achieve 30% weight reduction vs. stainless steel.

Product Show

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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