Traditional galvanized steel has been widely used for solar mounting brackets because of its cost-effectiveness and reliable corrosion protection. However, for projects located in coastal areas, industrial environments, or regions with high humidity and aggressive atmospheric conditions, standard galvanized coatings may not always provide sufficient long-term protection.
Products Description
Zn-Al-Mg coated steel (ZAM steel), an advanced metallic coated steel solution that combines the protection advantages of zinc, aluminum, and magnesium. Among different structural steel grades, S250GD+ZM Zn-Al-Mg coated steel coil has become an ideal material choice for manufacturing durable solar mounting components such as galvanized C channel steel, strut channels, and photovoltaic mounting brackets.
According to EN 10346, S250GD+ZM belongs to the family of structural steels with metallic coatings. The grade provides a minimum yield strength of 250 MPa and is available with ZM zinc-aluminum-magnesium coating technology.
specifications of S250GD+ZM Steel
S250GD+ZM is a high-strength structural steel with a zinc-aluminum-magnesium alloy coating applied through a continuous hot-dip coating process.
The designation can be explained as follows:
| Symbol | Meaning |
|---|---|
| S | Structural steel |
| 250 | Minimum yield strength of 250 MPa |
| GD | Hot-dip galvanized structural steel grade |
| +ZM | Zinc-Aluminum-Magnesium coating |
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S250GD+ZM steel chemical composition
| Grade |
Material No. |
C |
Si |
Mn |
P |
S |
|
S250GD+ZM |
1.0242+ZM |
0.20 |
0.60 |
1.70 |
0.10 |
0.045 |
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S250GD+ZM steel Mechanical properties
| Grade |
Material No. |
Yield Strength MPa |
Tensile strength MPa min |
Elongation A80 min |
|
S250GD+ZM |
1.0242+ZM |
250 |
330 |
19 |
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Typical specifications of S250GD+ZM steel coil include
| Item | Specification |
|---|---|
| Steel Grade | S250GD+ZM |
| Standard | EN 10346 |
| Coating Type | Zn-Al-Mg Alloy Coating |
| Yield Strength | ≥250 MPa |
| Tensile Strength | ≥330 MPa |
| Thickness Range | 0.45–6.0 mm |
| Application | Solar brackets, C channels, structural components |
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Unlike traditional galvanized steel (+Z), which mainly uses a pure zinc coating, ZM coated steel contains zinc combined with aluminum and magnesium. The additional alloying elements create a more stable protective layer on the steel surface, improving corrosion resistance and extending service life.
S250GD+ZM is commonly selected for structural applications where both mechanical strength and corrosion resistance are required, including:
1.Solar PV mounting systems
2.Agricultural solar structures
3.Industrial support frames
4.Steel framing systems
5.Outdoor structural components
Key Advantages of S250GD+ZM Steel Coil
1. Superior Corrosion Resistance
For solar mounting structures, corrosion resistance is one of the most important factors because the brackets are usually installed outdoors for 20–30 years or even longer.
The Zn-Al-Mg coating provides stronger corrosion resistance compared with conventional galvanized coatings, making S250GD+ZM suitable for:
- Coastal solar farms
- Offshore photovoltaic projects
- High rainfall regions
- Industrial environments
This helps reduce maintenance requirements and improves the overall reliability of PV systems.
2. Excellent Edge Protection After Cutting and Processing
Solar mounting brackets require multiple processing operations, including:
- Cutting
- Punching
- Bending
- Roll forming
- Welding
During fabrication, exposed edges may become potential corrosion points.
One of the advantages of ZM coating is its ability to provide improved protection around cut edges through the formation of protective corrosion products. This makes it especially suitable for fabricated components such as C channels and solar mounting rails.
3. High Strength with Lightweight Design
S250GD+ZM provides a good balance between strength and formability.Its minimum yield strength of 250 MPa allows manufacturers to produce structural components with sufficient load-bearing capacity while maintaining reasonable material weight.
S250GD+ZM vs Traditional Galvanized Steel for Solar Brackets
| Feature | Traditional Galvanized Steel | S250GD+ZM Steel |
|---|---|---|
| Coating | Zinc | Zinc + Aluminum + Magnesium |
| Corrosion Resistance | Good | Excellent |
| Edge Protection | Standard | Improved |
| Outdoor Durability | Suitable | Better for harsh environments |
| Maintenance Requirement | Medium | Lower |
| PV Application | Common | Increasingly preferred |
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Photovoltaic Mounting System Installation
About GNEE STEEL
GNEE STEEL provides S250GD+ZM Zn-Al-Mg coated steel coils and customized galvanized C channel solar mounting components for renewable energy and structural applications.
Based on high-quality Zn-Al-Mg coated steel materials, we support customers with customized processing services including roll forming, cutting, punching, bending, and fabrication.
Whether you need S250GD+ZM steel coils, galvanized C channels, or complete PV mounting brackets, GNEE STEEL can provide professional steel solutions according to your project requirements.
Export Case Studies
500 tons of galvanized coils exported to Saudi Arabia.
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FAQ
1. What does S250GD+ZM mean?
S250GD+ZM is a structural steel grade with a zinc-aluminum-magnesium alloy coating according to EN 10346. It combines structural strength with enhanced corrosion protection.
2. Is S250GD+ZM suitable for solar mounting brackets?
Yes. S250GD+ZM is widely used for PV mounting structures because of its strength, corrosion resistance, and excellent processing performance.
3. What is the difference between GI steel and ZAM steel?
GI steel uses a mainly zinc coating, while ZAM steel contains zinc, aluminum, and magnesium to provide improved corrosion protection.
4. Can S250GD+ZM steel be processed into C channels?
Yes. S250GD+ZM steel coil is suitable for roll forming and can be manufactured into C channels, strut channels, and solar mounting brackets.