Structural galvanized steel sheet
S250GD+Z stands as a benchmark structural galvanized steel sheet designed for applications that demand exceptional corrosion resistance and reliable mechanical performance. The "S250" yield strength and zinc coating offered by this material make it suitable for environments where weather, moisture, and abrasion are concerns. With multiple surface treatment options - including spangle variations and passivation layers - this grade is not just functional but also adaptable to aesthetic requirements.
Advantages of S250GD
- higher corrosion resistance
- Excellent formability
- Low crack susceptibility of the coating
- Yield point of 250 N/mm² for high strength, high corrosion resistance construction parts.
- Beautiful surface, corrosion resistance, good welding performance, certain stamping performance, durable
Chemical composition percentage of steel S250GD
| C | Si | Mn | P | S |
| max 0.2 | max 0.6 | max 1.7 | max 0.1 | max 0.045 |
Mechanical properties of steel S250GD
| Rm - Tensile strength (MPa) | 330 |
| Rp0.2 0.2% proof strength (MPa) | 250 |
| A - Min. elongation Lo = 80 mm (%) | 19 |
Application Scenarios
S250GD+Z galvanized steel performs particularly well in the following environments:
1. Structural Building Components
Galvanized steel sheets are integral to modern construction due to their reliability and longevity.
- Roof decking and wall cladding
- Load-bearing purlins and columns
- Secondary framing for curtain walls
Buildings exposed to coastal climates or industrial pollution benefit from the sacrificial protection of galvanization, helping stave off rust and structural degradation.
2. Agricultural and Farm Structures
Agricultural facilities require materials that withstand humidity and chemical exposure from fertilizers and animal waste. S250GD+Z is commonly used in:
- Barn siding and roofing
- Livestock enclosures
- Feed storage structures
- Equipment shelters
The durable coating reduces maintenance time, allowing farmers to focus on operations rather than corrosion issues.
3. Solar Farm and Renewable Installations
With the rise of renewable energy projects, galvanized structural products are increasingly specified for:
- Solar panel mounting frames
- Support structures for tracking systems
- Light-weight galvanized arrays
The combination of corrosion resistance and strength ensures long service life in outdoor energy installations.
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 |
|
Standard |
Grade |
C |
Si |
Mn |
P |
S |
Ti |
|
Forcold Forming Chinese Standard |
DX51D+Z |
0.12 |
0.50 |
0.60 |
0.100 |
0.045 |
0.30 |
|
DX52D+Z |
0.12 |
0.50 |
0.60 |
0.100 |
0.045 |
0.30 |
|
|
DX53D+Z |
0.12 |
0.50 |
0.60 |
0.100 |
0.045 |
0.30 |
|
|
DX54D+Z |
0.12 |
0.50 |
0.60 |
0.100 |
0.045 |
0.30 |
|
|
DX56D+Z |
0.12 |
0.50 |
0.60 |
0.100 |
0.045 |
0.30 |
|
|
DX57D+Z |
0.12 |
0.50 |
0.60 |
0.100 |
0.045 |
0.30 |
|
|
Forcold Forming Japanese Standard |
SGCC |
0.15 |
0.50 |
0.80 |
0.050 |
0.030 |
0.025 |
|
SGCD1 |
0.12 |
0.50 |
0.60 |
0.040 |
0.030 |
0.025 |
|
|
SGCD3 |
0.08 |
0.50 |
0.45 |
0.030 |
0.030 |
0.025 |
|
|
SGCD4 |
0.06 |
0.50 |
0.45 |
0.030 |
0.030 |
0.025 |
|
|
For Structure Japanese Standard |
SGC340 |
0.25 |
0.50 |
1.70 |
0.200 |
0.035 |
0.025 |
|
SGC400 |
0.25 |
0.50 |
1.70 |
0.200 |
0.035 |
0.150 |
|
|
SGC490 |
0.30 |
0.50 |
2.00 |
0.200 |
0.035 |
0.025 |
|
|
SGC510 |
0.30 |
0.50 |
2.50 |
0.200 |
0.035 |
0.025 |
|
|
For Structure AISI Standard |
S220GD+Z |
0.20 |
0.60 |
0.70 |
0.100 |
0.045 |
0.025 |
|
S250GD+Z |
0.20 |
0.60 |
0.70 |
0.100 |
0.045 |
0.025 |
|
|
S280GD+Z |
0.20 |
0.60 |
0.70 |
0.100 |
0.045 |
0.025 |
|
|
S320GD+Z |
0.20 |
0.60 |
0.70 |
0.100 |
0.045 |
0.025 |
|
|
S350GD+Z |
0.20 |
0.60 |
0.70 |
0.100 |
0.045 |
0.150 |
|
|
S550GD+Z |
0.20 |
0.60 |
0.70 |
0.100 |
0.045 |
0.150 |
