What Is S280GD Galvanized Steel?
S280GD Galvanized Steel is a structural-grade hot-dip galvanized steel defined under EN 10346. The designation "S280GD" carries clear technical meaning: "S" refers to structural steel, "280" indicates a minimum yield strength of 280 MPa, and "GD" stands for galvanized delivery condition.
This steel grade is widely used in construction, steel structures, and industrial manufacturing where strength, formability, and corrosion resistance are all required.
At GNEE STEEL, S280GD Galvanized Steel is supplied in coils, sheets, and customized cut-to-length formats to meet different project demands.
The physical properties of S280GD steel determine how it behaves under mechanical load, temperature change, and forming processes. These properties are essential when engineers select materials for load-bearing or long-life applications.
Density and Mass Characteristics
S280GD has a density close to that of conventional carbon steel, which makes it predictable for structural calculations.
| Property | Typical Value |
|---|---|
| Density | 7.85 g/cm³ |
| Elastic Modulus | ~210 GPa |
| Poisson's Ratio | ~0.3 |
These values ensure that S280GD Galvanized Steel behaves reliably in structural simulations and real-world installations.
Yield Strength and Tensile Strength
The defining physical advantage of S280GD steel is its balanced strength profile, offering higher yield strength than S250GD while maintaining good ductility.
| Mechanical Property | Typical Requirement |
|---|---|
| Yield Strength (Re) | ≥ 280 MPa |
| Tensile Strength (Rm) | 360–480 MPa |
| Elongation (A80) | ≥ 18% |
This combination makes S280GD Galvanized Steel suitable for medium-load structural components without sacrificing forming performance.
Formability and Bending Performance
Despite its higher strength, S280GD steel maintains good cold-forming capability. It supports bending, roll forming, and profiling operations commonly used in roofing panels, purlins, and steel frames.
Compared with lower-strength grades, S280GD offers:
- Better resistance to deformation
- Stable geometry after forming
Reduced material thickness without compromising strength
| Steel Grade | Yield Strength | Formability Level |
|---|---|---|
| S250GD | ≥ 250 MPa | Excellent |
| S280GD | ≥ 280 MPa | Very Good |
| S350GD | ≥ 350 MPa | Moderate |
Thermal and Environmental Behavior
S280GD Galvanized Steel performs well under typical service temperatures for construction and industrial environments. The zinc coating protects the base steel from oxidation, extending service life even in humid or mildly corrosive conditions.
| Parameter | Performance |
|---|---|
| Thermal Expansion | Stable, similar to carbon steel |
| Heat Resistance | Suitable for standard construction temperatures |
| Outdoor Durability | Excellent with zinc coating |
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 | -- |
GNEE STEEL supplies S280GD products with consistent physical performance, ensuring reliable behavior across different batches and applications.