Galvanized steel
Galvanized steel sheet is a carbon steel product coated with zinc, which forms a protective layer to resist corrosion. It is widely used in automotive, construction, industrial equipment, and home appliance fields.
The S320GD galvanized steel sheet is a high-strength structural grade, with a minimum yield strength of 320MPa, suitable for load-bearing and structural applications.
Looking for reliable S320GD galvanized steel sheet suppliers in China? You've come to the right place. As a direct factory with 20 years of structural steel experience, GNEE Steel provides EN 10346 compliant S320GD+Z sheets with customized zinc coatings at factory prices. In this guide, we'll help you select the right zinc coating and share 2026 latest quotes for different coating grades.
Galvanized steel sheet
Zinc Coating Basics for S320GD Galvanized Steel Sheet
Zinc coating is the core of S320GD's corrosion resistance, formed via hot-dip galvanizing process.
It works through sacrificial anode protection, preventing the steel base from rusting.
Coating weight and uniformity directly affect the service life of S320GD sheets.
Common coating grades for S320GD include Z60, Z180, Z275, and Z350, tailored to different environments.
Chemical Composition & Mechanical Properties of S320GD
The performance of S320GD is determined by its chemical composition, which also influences coating adhesion.
|
Chemical Element (Wt%) |
EN 10346 Standard Range |
|---|---|
|
Carbon (C) |
≤0.25% |
|
Silicon (Si) |
≤0.60% |
|
Manganese (Mn) |
≤1.70% |
|
Phosphorus (P) |
≤0.10% |
|
Sulfur (S) |
≤0.045% |
|
Mechanical Property |
Specification Value |
|---|---|
|
Minimum Yield Strength |
≥320MPa |
|
Tensile Strength |
360-510MPa |
|
Elongation (A80mm) |
≥20% |
Common Zinc Coating Grades for S320GD Sheets
Different zinc coating grades offer varying corrosion resistance, matching diverse application scenarios.
|
Coating Grade |
Coating Weight (g/㎡, Double-Sided) |
Salt Spray Test Duration |
Applicable Environment |
|---|---|---|---|
|
Z60 |
≥60 |
≥200 Hours (No Red Rust) |
Indoor dry environments (appliance casings) |
|
Z180 |
≥180 |
≥500 Hours (No Red Rust) |
Outdoor dry areas (building roof panels) |
|
Z275 |
≥275 |
≥1000 Hours (No Red Rust) |
Humid outdoor/coastal areas (automotive chassis) |
|
Z350 |
≥350 |
≥1500 Hours (No Red Rust) |
Severe corrosion environments (marine projects) |
Key Factors to Choose Zinc Coating for S320GD
-
Application Environment
Indoor dry scenarios can use Z60/Z180 to save costs.
Coastal, humid, or industrial areas require Z275/Z350 for durability.
-
Service Life Requirement
10-15 years service life: Z180 is sufficient for general use.
20+ years service life: Choose Z275 or higher coating grade.
-
Processing Requirements
High forming processes (bending/stamping) need uniform coatings.
Thicker coatings (Z275+) require careful processing to avoid peeling.
Size Specifications of S320GD with Different Zinc Coatings
Zinc coating grades are compatible with all standard sizes of S320GD sheets.
|
Thickness (mm) |
Width (mm) |
Length (mm) |
Recommended Coating Grade |
|---|---|---|---|
|
0.3-0.8 |
800-1500 |
1000-2000 |
Z60/Z180 (appliance parts) |
|
0.9-2.0 |
800-1800 |
1000-2500 |
Z180/Z275 (building panels) |
|
2.1-3.0 |
800-1800 |
1000-3000 |
Z275/Z350 (structural supports) |
Choosing the right zinc coating is crucial to maximize the performance of S320GD galvanized steel sheet. Consider environment, service life, and processing needs for an optimal choice. Check our S320GD galvanized steel sheet specs for detailed coating parameters, or contact us now to get a 2026 customized coating quote and factory-direct supply!
- 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 | -- |