S320GD Steel Grade
S320GD is a structural-grade steel specifically designed for hot dip galvanizing applications. It is widely recognized for its balance between mechanical strength, formability, and surface coating compatibility.
The designation S320GD can be interpreted as follows:
- S: Structural steel
- 320: Minimum yield strength of 320 MPa
- GD: Supplied in galvanized condition
This grade is commonly selected for load-bearing components where corrosion resistance and long-term durability are equally important.
Compared with lower-strength galvanized grades, S320GD provides enhanced load performance while maintaining good forming characteristics, making it suitable for both roll forming and structural fabrication.
What Is Hot Dip Galvanized Steel?
Hot dip galvanized steel is produced by immersing steel into molten zinc at high temperatures. During this process, a metallurgical bond forms between zinc and the steel substrate, creating multiple zinc-iron alloy layers.
This coating method offers significantly better protection than surface painting or electro-galvanizing, especially in outdoor or industrial environments.
Key advantages of hot dip galvanizing include:
- Full-surface corrosion protection
- Self-healing ability at cut edges
- Long service life with minimal maintenance
- Uniform coating thickness
When applied to S320GD structural steel, hot dip galvanizing enhances both functional performance and economic value.
Z275 refers to a total zinc coating mass of 275 g/m², distributed on both sides of the steel surface. This coating level is widely adopted for construction and industrial uses due to its strong balance of protection and cost efficiency.
Zinc Coating Performance Comparison
| Zinc Coating | Total Coating Mass (g/m²) | Typical Service Life |
|---|---|---|
| Z100 | 100 | Short-term indoor use |
| Z180 | 180 | Light outdoor exposure |
| Z275 | 275 | Structural & outdoor use |
| Z350 | 350 | High humidity environments |
Z275 is often considered the standard coating for structural galvanized steel in global markets.
Mechanical Properties of S320GD+Z275
| Property | Typical Value | Unit |
|---|---|---|
| Yield Strength | ≥ 320 | MPa |
| Tensile Strength | 420–550 | MPa |
| Elongation (A80) | ≥ 22 | % |
| Zinc Coating | Z275 | g/m² |
These mechanical characteristics allow S320GD hot dip galvanized steel coil and sheet to perform reliably under mechanical stress while maintaining excellent corrosion resistance.
Typical Applications
S320GD+Z275 hot dip galvanized steel is commonly used in:
- Structural framing systems
- Roofing and wall cladding
- Purlins and support beams
- Industrial enclosures
- Agricultural and storage facilities
Its versatility makes it suitable for both standardized construction systems and customized fabrication projects.
Available Steel Grade
|
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 |
GNEE STEEL supplies S320GD+Z275 Hot Dip Galvanized Steel with strict quality control and stable production standards. With extensive experience in galvanized steel export, GNEE STEEL ensures consistent coating weight, reliable mechanical properties, and precise dimensional tolerances.
From steel coils to sheets and customized cutting solutions, GNEE STEEL provides dependable galvanized steel products tailored for structural and industrial applications, helping customers reduce long-term maintenance costs while ensuring structural safety.
