Galvanized Steel
S280GD+Z and S350GD+Z Galvanized Steel are structural steel grades specified under EN 10346, designed for applications requiring mechanical strength combined with corrosion protection.The prefix "S" represents structural steel, the numbers 280 and 350 indicate the minimum yield strength in MPa, and "+Z" confirms that the steel is supplied with a hot-dip zinc coating.
Both grades are widely used in steel structures, building systems, and industrial facilities, but their performance characteristics lead to different application priorities.
Selecting between S280GD+Z and S350GD+Z Galvanized Steel directly affects structural safety, fabrication efficiency, and long-term durability.
Although both grades comply with EN 10346, their different strength levels result in distinct performance outcomes.
S280GD + Z VS S350GD+Z
| Property | S280GD galvanized steel | S350GD galvanized steel |
| Yield Strength | ≥280 MPa | ≥350 MPa |
| Tensile Strength | 380–500 MPa | 350–480 MPa |
| Formability | Excellent | Moderate |
| Weldability | Good | Moderate |
| Cost Efficiency | 15% lower vs. S350GD | Higher material cost |
| Best For | High-strength formable parts | Maximum load-bearing |
Structural Design Flexibility
S280GD+Z provides greater elongation, which allows designers more tolerance during forming and installation.
| Design Aspect | S280GD+Z | S350GD+Z |
|---|---|---|
| Elongation | Higher | Lower |
| Forming tolerance | Wide | Narrow |
| Structural rigidity | Medium | High |
| Installation flexibility | High | Moderate |
This makes S280GD+Z especially suitable for projects with complex geometry or on-site adjustments.
Fabrication and Installation Performance
| Fabrication Factor | S280GD+Z | S350GD+Z |
|---|---|---|
| Cutting and punching | Easy | Requires control |
| Welding stability | Good | Needs parameter optimization |
| On-site modification | More tolerant | Less tolerant |
For small to medium fabrication facilities, S280GD+Z often reduces production risk.
Long-Term Performance and Maintenance
With proper zinc coating, both grades offer:
- Excellent corrosion resistance
- Long service life
- Reduced maintenance requirements
However, S350GD+Z maintains stiffness better under continuous heavy loads, while S280GD+Z performs reliably under moderate structural demands.
Available Steel Grade
| Steel grade | Coating | Yield(MPA) | Tensile(MPA) | Elongation(%) |
| DX51D | Z,ZF | -- | 270-500 | 20 |
| DX52D | Z,ZF | 140-300 | 270-420 | 22 |
| DX53D | Z,ZF | 140-260 | 270-380 | 26 |
| DX54D | Z,ZF | 140-220 | 270-350 | 30 |
| S220GD | Z,ZF | 220 | 300 | 18 |
| S250GD | Z,ZF | 250 | 330 | 17 |
| S280GD | Z,ZF | 280 | 360 | 16 |
| S320GD | Z,ZF | 320 | 390 | 15 |
| S350GD | Z,ZF | 350 | 420 | 14 |
| S400GD | Z,ZF | 400 | 470 | -- |
| S450GD | Z,ZF | 450 | 530 | -- |
| S500GD | Z,ZF | 500 | 560 | -- |
When choosing between S280GD+Z and S350GD+Z, factors such as load requirement, fabrication capability, and budget must be evaluated together.
GNEE STEEL supplies S280GD+Z, S350GD+Z, S250GD+Z, DX51D+Z, and DX54D+Z Galvanized Steel, ensuring stable quality, consistent coating performance, and reliable delivery.
With extensive experience in galvanized steel products, GNEE STEEL supports customers with practical material solutions that balance performance, durability, and cost efficiency.