galvanized steel sheet
Looking for trusted S550GD galvanized steel plate manufacturers in China? You've come to the right place. As a direct factory with 20 years of structural steel experience, GNEE Steel supplies EN 10346 compliant S550GD galvanized steel sheet and plate at factory prices. In this guide, we'll detail full specifications and help you calculate the total landing cost including freight and customs.
Galvanized steel is steel with a zinc coating to resist corrosion, used in construction, automotive, and electrical industries. Common grades include DX51D (general use), S350GD (medium strength), and S550GD (high strength). S550GD stands out for its 550MPa minimum yield strength, ideal for load-bearing applications.
Galvanized steel sheet
Chemical Composition of S550GD Galvanized Steel
The chemical composition of S550GD galvanized steel sheet and plate follows EN 10346 (1.0531 material standard):
| Element | Content (Max. %) | Role in Performance |
|---|---|---|
| Carbon (C) | 0.12 | Enhances strength without reducing weldability |
| Silicon (Si) | 0.50 | Improves oxidation resistance during galvanizing |
| Manganese (Mn) | 1.60 | Boosts tensile strength and hardenability |
| Phosphorus (P) | 0.030 | Prevents cold brittleness in low temperatures |
| Sulfur (S) | 0.025 | Reduces hot cracking during fabrication |
| Aluminum (Al) | ≥0.015 | Refines grain structure for better formability |
| Zinc (Zn) | Coating: 60-275g/m² | Provides corrosion protection as outer layer |
Mechanical Properties of S550GD Sheet and Plate
S550GD's mechanical properties make it suitable for structural applications:
| Property | Minimum/Range | Test Standard |
|---|---|---|
| Yield Strength (Rp0.2) | ≥550 MPa | EN ISO 6892-1 |
| Tensile Strength (Rm) | 600-730 MPa | EN ISO 6892-1 |
| Elongation (A80mm) | ≥14% | EN ISO 6892-1 |
| Bending Capacity | 180° without cracking | EN ISO 7438 |
| Impact Energy (-20°C) | ≥27 J | EN ISO 148-1 |
Dimensional Specifications of S550GD Products
GNEE Steel offers S550GD galvanized steel sheet and plate with flexible dimensions:
| Product Type | Thickness Range | Width Range | Length Range | Tolerance |
|---|---|---|---|---|
| Steel Sheet | 0.8-3.0 mm | 900-1800 mm | 2000-12000 mm | Thickness: ±0.05mmWidth: ±2mmLength: ±3mm |
| Steel Plate | 3.0-6.0 mm | 900-1800 mm | 2000-12000 mm | Thickness: ±0.08mmWidth: ±2mmLength: ±3mm |
Coating Specifications for S550GD Galvanized Steel
The zinc coating is critical for S550GD's corrosion resistance:
- Coating Type: Hot-dip galvanized (HDG) per EN 10346
- Coating Weight Options:
Light coating: 60-120g/m² (indoor applications)
Medium coating: 120-180g/m² (general outdoor use)
Heavy coating: 180-275g/m² (harsh environments)
- Surface Finish Options:
Regular spangle: Cost-effective, good adhesion
Minimized spangle: Improved appearance for visible applications
Zero spangle: Smooth surface for painting and printing
Applications
Thanks to its high mechanical performance and robust corrosion protection, S550GD can be used in a wide range of construction applications:
- Load-bearing steel structures: Supports, beams and frames in industrial halls, bridges and high-bay warehouses.
- Highly stressed components: Crane runways, walkways and heavy-duty frames where maximum strength and wear resistance are required.
- Roof and façade systems: profiled and trapezoidal sheets for commercial and public buildings with high structural requirements.
- Infrastructure components: Tunnel linings, noise barriers and technical installations in transportation and civil engineering.
- Solar mounting systems & substructures: Large module supports and racks that require both high load-bearing capacity and weather resistance.
The choice of a suitable coating makes it possible to maximize the service life of the components and minimize maintenance cycles.
Application Scenarios
Understanding the full specifications helps you select the right S550GD galvanized steel sheet and plate for your project. Contact GNEE Steel today to get a customized quotation and the latest 2026 price list!
Click here to get your 2026 latest price list !
|
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 |