Galvanized steel sheet
S250GD+Z is a structural-grade galvanized steel sheet engineered for durability, corrosion resistance, and formability. This steel grade complies with rigorous standards for performance in demanding environments. The "S250" designation refers to a minimum yield strength of 250 MPa, while "GD+Z" indicates a hot-dip galvanized coating that provides robust protection against atmospheric corrosion. Combined with carefully selected surface characteristics like spangle size and coating weight, S250GD+Z galvanized steel is widely used across multiple industries requiring both strength and long-lasting finish performance.
S250GD is available in the following hot dip coatings: S250GD+Z (galvanized), S250GD+ZF (galvanized-iron), S250GD+ZA (galvanized-aluminum), S250GD+AZ (aluminum-zinc), S250GD+AS (galvanized-iron) aluminum silicon).
In addition to carbon, S250GD also contains small amounts of manganese (Mn), silicon (Si), sulfur (S), phosphorus (P), oxygen (O), nitrogen (N) and hydrogen (H), which are produced by It is brought into the ore and smelting process, so it is called impurity element.
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 |
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 |
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
Common Surface Treatment Options & Zinc Spangle Selection
Surface treatments and zinc spangle selection are crucial for performance and visual requirements. The most common options include:
1. Regular Spangle (RS):
• Standard aesthetic pattern visible after galvanizing.
• Good option where typical industrial appearance is acceptable.
2. Minimized Spangle (MS):
• Reduced "flower" pattern for cleaner, more uniform appearance.
• Preferred in architectural and consumer product applications.
3. Anti-Fingerprint (AFP) or Passivation:
• Provides enhanced resistance to surface marks during handling.
• Ideal for interior panels, exposed steel components, and premium finishes.
The choice of finish often depends on the end application and environmental exposure.
S250GD+Z Galvanized Steel Specifications
Below are example specification tables showcasing commonly supplied thickness, width, and coating weight options:
Table 1 - General Mechanical & Coating Requirements
| Property | Typical Value |
|---|---|
| Grade | S250GD+Z |
| Minimum Yield Strength | 250 MPa |
| Tensile Strength | 300–410 MPa |
| Elongation (%) | ≥ 20% |
| Zinc Coating Mass (g/m²) | 100, 140, 180, 220 options |
Table 2 - Typical Supply Range Dimensions
| Thickness (mm) | Width (mm) | Zinc Spangle Option |
|---|---|---|
| 0.50 | 800–1500 | RS / MS |
| 0.60 | 800–1500 | RS / MS / AFP |
| 0.80 | 800–1500 | MS / AFP |
| 1.00 | 800–1500 | MS / AFP |
Our company also produces the following grades of galvanized steel:
|
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 |
