Galvanized steel sheet
S250GD+Z galvanized steel sheet represents a go-to solution for structural applications requiring balanced strength and corrosion resistance. This product, featuring a zinc protective layer, delivers extended service life in challenging environments while supporting flexible fabrication.
S250GD galvanized steel sheet/plate is a low-alloy, high-strength hot-rolled steel, commonly used in construction, automotive, and appliance industries. Its main components include iron and low carbon content, typically between 0.06%-0.12%. The steel sheet/plate is coated with a zinc layer through hot-dip galvanizing, which provides a uniform protective barrier against corrosion.
With a tensile strength of 250 MPa, S250GD can handle significant mechanical stress. The zinc layer enhances its durability, making it suitable for outdoor applications and extending product lifespan while minimizing maintenance needs.
Where S250GD+Z Fits Best
1. Architectural Exposed Steelwork
Architectural designs often call for steel that not only performs but also maintains a refined appearance over time. Typical uses:
Exterior facades
Canopies and overhangs
Decorative structural elements
Public space shelters
MS or pre-paint compatible finishes are often chosen to enhance visual continuity.
2. Industrial Facility Structures
Industrial environments involve frequent exposure to humidity, heat variation, and airborne chemicals. S250GD+Z galvanized sheets are widely applied to:
Factory wall panels
Mezzanine floors
Structural braces
Support frames
Corrosion protection lowers maintenance and enhances safety in these demanding settings.
3. Outdoor Storage and Logistics Facilities
Storage yards and logistics hubs face variable weather conditions and mechanical wear:
Outdoor mezzanines
Cold storage support frames
Loading dock guards
Pallet rack systems
The galvanized coating's sacrificial nature means fewer replacements and sustained performance.
Detailed Product Specifications
Table 1 - Performance Parameters
| Property | Standard Value |
|---|---|
| Yield Strength (MPa) | ≥ 250 |
| Tensile Strength (MPa) | 300–410 |
| Elongation (%) | ≥ 20 |
| Zinc Coating (g/m²) | 100 / 140 / 180 / 220 |
Table 2 - Dimensions & Surface Options
| Thickness (mm) | Width (mm) | Finish Options |
|---|---|---|
| 0.50 | 800–1250 | RS / MS |
| 0.65 | 900–1500 | MS / AFP |
| 0.85 | 900–1500 | MS / AFP / Pre-painted |
| 1.00 | 1000–1500 | MS / AFP / Pre-painted |
These ranges are typical; GNEE STEEL offers customization based on application needs.
Selecting the Right Zinc Coating Weight
The "spangle" is a type of surface morphology found on hot-dip galvanized (pure zinc-coated) steel coils. When the steel strip passes through the zinc pot, its surface becomes coated with liquid zinc. As the zinc layer naturally solidifies, zinc grains nucleate and grow, forming what is known as "spangle."
The name "spangle" comes from the fact that the complete zinc crystals display a snowflake-like pattern, which is quite vivid and descriptive.
S250GD+Z includes a hot-dip galvanized zinc coating that protects the steel while enabling multiple finishes based on performance and appearance needs.
Surface Options:
RS (Regular Spangle): Classic galvanized pattern.
MS (Minimized Spangle): Cleaner visual finish.
AFP / Pre-paint Compatible: Reduced handling marks and optimal for painted systems.
Selecting the right surface finish ensures the product meets both functional and visual project demands.
The zinc coating weight influences longevity in corrosive environments:
** Z100–Z140:** Standard protection for general environments.
** Z180–Z220:** Enhanced protection for coastal, industrial, and humid climates.
Higher coating mass increases durability and service intervals, which is essential for projects with extended lifecycle expectations.
- Zinc Thickness
| Zinc Coating Grade | Zinc Coating (g/m²) | Corrosion Resistance | Typical Applications | Remarks |
| Z30 | 30 | Very low | Indoor parts, home appliance inner panels, ventilation ducts | Not suitable for outdoor use |
| Z60 | 60 |
Low |
Indoor structures, temporary facilities | Low cost |
| Z80 | 80 | Medium | Light steel structures, base metal for PPGI | Good cost performance |
| Z100 | 100 | Medium | PPGI, fencing, general construction
|
Common export grade |
| Z120 | 120 | Medium-High |
|
Longer service life |
| Z140 | 140 | Medium-High | Industrial buildings, agricultural facilities | Suitable for outdoor use |
| Z180 | 180 | High | Long-term outdoor structures, equipment housings
|
Recommended for outdoor use |
| Z200 | 200 | Very high | Humid environments, heavy structures
|
Higher cost |
| Z275 | 275 | Excellent
|
Coastal areas, solar mounting systems, high-corrosion environments | High standard |
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Real-World Application Examples
A. Transportation Shelters & Covers
Dynamic environments benefit from galvanized protection to resist moisture and abrasion.
B. Agricultural Buildings
Humidity and corrosive exposure from feed and waste products make galvanized surfaces a practical choice.
C. Outdoor Infrastructure Components
Guardrails, sign supports, and structural frames withstand weather extremes with S250GD+Z galvanization.
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Why S250GD+Z Makes Sense
Balanced Performance: Reliable strength for structural loads with corrosion protection.
Low Lifecycle Cost: Reduced need for repainting or replacement.
Surface Flexibility: Aesthetic options help meet architectural expectations.
For construction, industrial facilities, storage solutions, renewable structures, and more - S250GD+Z galvanized steel sheets deliver performance you can trust. With versatile surface treatments and customizable specifications, GNEE STEEL provides solutions tailored to your project demands.
