Hot-dip Galvanized Steel
S250GD is a structural grade of hot-dip galvanized steel. It is classified under the EN 10346:2015 standard and designated by material number 1.0242. The material offers excellent strength, formability, and corrosion resistance. It is frequently applied in exterior building surfaces, roofs, automotive components, and structural elements subjected to environmental pressures. Its excellent formability allows it to be easily processed into coils and strips, which can be welded and formed into different shapes for various applications.
Coated with a coating of zinc, galvanized steel is a kind of steel. Because the zinc coating prevents corrosion, the steel lasts a very long time. Numerous industrial and residential construction projects make use of galvanized steel, as does the roofing, siding, and fence industries.
The production process for galvanized steel is as follows.
S250GD Galvanized Steel Coil Chemical Composition
| Element | Maximum Content (%) |
| Carbon (C) | 0.2 |
| Silicon (Si) | 0.6 |
| Manganese (Mn) | 1.7 |
| Phosphorus (P) | 0.1 |
| Sulfur (S) | 0.045 |
S250GD Galvanized Steel Coil Mecahmical Properties
| Property | Value |
| Tensile Strength (Rm) | ≥ 250 MPa |
| 0.2% Proof Strength (Rp0.2) | ≥ 330 MPa |
| Minimum Elongation (Lo = 80 mm) (A) | ≥ 19% |
Importance of Zinc Coating in Corrosion Resistance
The zinc coating provides integral corrosion protection to steel products and extends service life. This treatment acts as a physical barrier and enables some galvanic effect on corrosion due to environmental exposure on steel. Below are some reasons for zinc coating being significant, along with supporting data:
- Barrier Protection
A zinc coating forms an impervious barrier over the steel surface, isolating it from moisture, oxygen, and other corrosion agents. Literature records show that a proper zinc coating can bring down corrosion by up to 90% in usual atmospheres.
- Galvanic Protection
Zinc acts as a sacrificial anode to protect steel. Data shows that this property may extend the life of steel parts by 20-30 years even in the most severe conditions.
- Self-Healing
Zinc protects the coated surface from scratching and abrasion by forming layers of zinc oxide and zinc carbonate. These materials rebuild the galvanized coating naturally as time passes, maintaining it.
- Resistance to Very Harsh Weather Conditions
Zinc coatings provide excellent corrosion resistance in any climate, providing durability from extreme humidity to salinity. The benchmarks indicate that hot-dip galvanizing will give more than 50 years of corrosion protection in rural atmospheres and 20-30 in coastal and industrial atmospheres.
- Cost-Effectiveness
While zinc coating has an upfront cost of application, it is a practical solution in that it reduces further maintenance and replacement costs. Life-cycle analysis points to zinc-coated steel being up to 50 percent cheaper in maintenance costs than uncoated steel over decades of operation.
The benefits above prove that zinc coating is essential in improving steel performance and durability in different industries.
|
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 remains focused on delivering stable quality and responsive service for all S250GD galvanized steel orders. By aligning production with customer needs and industry trends, the company continues to strengthen its role as a reliable supplier.
For detailed information on S250GD Galvanized Steel products and availability, customers are welcome to contact GNEE STEEL to discuss project requirements and obtain quotations.
