structural galvanized steel
S280GD and S320GD are structural galvanized steel grades specified under EN 10346, widely used in construction, steel structures, and industrial systems that require both mechanical strength and corrosion resistance.
The designation system is straightforward: "S" refers to structural steel, the numbers 280 and 320 indicate the minimum yield strength in MPa, and "GD" means the steel is delivered in galvanized condition, typically through hot-dip galvanizing.
Both S280GD Galvanized Steel and S320GD Galvanized Steel are designed to meet modern structural requirements, but their mechanical performance and application focus differ in practical use.
Selecting the correct galvanized steel grade is essential for structural safety, fabrication efficiency, and long-term durability.Although S280GD and S320GD Galvanized Steel share similar standards and corrosion protection, their mechanical differences lead to distinct performance outcomes in real projects.
S280GD Galvanized Steel provides greater elongation, which improves forming tolerance and reduces the risk of cracking during fabrication.
| Design Aspect | S280GD | S320GD |
|---|---|---|
| Elongation | Higher | Slightly lower |
| Forming tolerance | Wide | Moderate |
| Structural rigidity | Medium | Medium–High |
| Design flexibility | High | Moderate |
For projects with complex geometry, S280GD often simplifies manufacturing.
Material cost must be evaluated at the project level rather than per ton.
| Cost Factor | S280GD | S320GD |
|---|---|---|
| Material price | Lower | Slightly higher |
| Steel consumption | Higher | Lower |
| Fabrication complexity | Lower | Moderate |
| Overall project efficiency | Stable | Optimized for load |
S320GD can reduce total steel usage, while S280GD helps control fabrication risk.
Application Differences
S280GD Galvanized Steel is widely used in:
- Light steel structures
- Roofing and wall cladding systems
- Purlins and secondary framing
S320GD Galvanized Steel is more commonly selected for:
- Medium-load structural members
- Industrial frames
- Applications requiring higher stiffness
The choice depends on whether forming flexibility or strength optimization is the primary concern.
Available Steel Grade
|
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 |
- Mechanical Properties
|
Grade |
Yield Strength MPa≥ |
Tensile Strength MPa≥ |
Elongation A%≥ |
|
DX51D Z/ZM/AZ/AM |
240-380 |
270-500 |
22 |
|
DX52D Z/ZM/AZ/AM |
140-300 |
270-420 |
26 |
|
DX53D Z/ZM/AZ/AM |
140-260 |
270-380 |
30 |
|
DX54D Z/ZM/AZ/AM |
120-220 |
260-350 |
36 |
|
S220GD Z/ZM/AM |
220 |
300 |
20 |
|
S250GD Z/ZM/AZ/AM |
250 |
330 |
19 |
|
S280GD Z/ZM/AM |
280 |
360 |
18 |
|
S300GD A/AM |
300 |
380 |
18 |
|
S320GD Z/ZM/AM |
320 |
390 |
17 |
|
S350GD Z/ZM/AZ/AM |
350 |
420 |
16 |
|
S450GD A/AM |
450 |
480 |
15 |
|
S550GD Z/ZM/AZ/AM |
550 |
550 |
- |
GNEE STEEL supplies S280GD and S320GD Galvanized Steel with reliable quality, consistent coating performance, and clear material traceability.
With a comprehensive galvanized steel product range and years of industry experience, GNEE STEEL supports customers with practical, trustworthy solutions for structural and industrial projects worldwide.