ZAM Steel for Solar Mounting Systems
Photovoltaic brackets provide stable support for solar panels, featuring high strength, corrosion resistance, and easy installation. Widely used in ground, rooftop, and tracking PV systems to improve power generation efficiency and long-term durability.
Detail Information
ZAM Steel for Solar Mounting Systems
Why ZAM Steel for Solar Structures?
ZAM (Zinc-Aluminum-Magnesium) alloy coated steel is the premium alternative to traditional hot-dip galvanized (HDG) steel for photovoltaic mounting systems. Trusted by solar EPC contractors and structure fabricators worldwide, ZAM steel delivers superior lifecycle performance with lower total project cost.
Superior Corrosion Resistance
2–3x more corrosion-resistant than traditional HDG (hot-dip galvanized) steel
Self-healing Zn-Al-Mg alloy coating automatically repairs cut edges and scratches
Ideal for coastal, high-humidity & industrial pollution environments | Designed for Extreme Outdoor Use
Excellent salt spray resistance — exceeds 3,000+ hours in salt spray test
Performance validated in desert, tropical, marine & industrial zones
Suitable for ground-mount, rooftop, floating & tracking solar systems |
Lifecycle Cost Reduction
Direct replacement for HDG and even partial stainless steel applications
Dramatically lowers LCC (Lifecycle Cost) — fewer replacements, less maintenance
ROI improvement over 20+ year solar project lifetime | Excellent Fabrication Performance
Superior roll forming, punching, and bending performance for C/Z purlin production
Strong coating adhesion — no peeling or cracking during processing
Minimized edge rust after cutting or drilling |
Solar Structure Applications
MESCO ZAM steel serves a wide range of photovoltaic (PV) structural applications globally, from utility-scale ground-mounted solar farms to residential rooftop installations.
Ground-Mount PV
Ground Solar
Mounting System | Rooftop PV
Rooftop Solar
Structure | Single-Axis Tracker
Solar Tracking
Systems | Solar Carport
PV Carport
Structures |
Offshore / Lake
Floating PV
Systems | Agri-PV / Farmland
Agricultural
Agrivoltaic Structures | PV Rails / Brackets
C/Z Purlin &
Rail Components | EPC / Large-Scale
Industrial &
Utility-Scale Plants |
Technical Specifications
Item | Specification |
Coating Type | ZAM — Zinc-Aluminum-Magnesium Alloy (Zn-Al-Mg) |
Zinc-Al-Mg Composition | Zn-6%Al-3%Mg (typical nominal composition) |
Thickness | 0.8 mm – 4.0 mm |
Width | 600 mm – 1,500 mm |
Coating Mass | ZM120 – ZM275 (g/m²) |
Steel Grade | S250GD / S350GD / S550GD (per EN 10346) | G300 / G550 (per AS 1397) |
Standard | JIS G3323 | EN 10346 | AS 1397 | GB/T 32969 |
Surface Treatment | Skinpass / DDQ / Oiled / Dry / Chromate-free passivation available |
Salt Spray Resistance | 3,000+ hours (ASTM B117 / ISO 9227) |
Yield Strength | 250 – 550 MPa depending on grade |
Elongation | ≥ 12% (varies by grade) |
Customization | Custom thickness, width, coating weight, coil ID/OD, and surface available per project requirement |
Note: Customized specifications available based on specific project requirements. Contact MESCO technical team for tailor-made solutions.
Performance Comparison: ZAM vs HDG vs Standard Galvanized
Performance Criteria | ZAM Steel
(MESCO | Hot-Dip
Galvanized (HDG) | Standard
Galvanize |
Corrosion Resistance | Excellent (5-12x) | Good | Moderate |
Cut Edge Self-Healing | Yes — Automatic | No | No |
Salt Spray (hrs) | 3,000+ hrs | ~1,000 hrs | ~500 hrs |
Service Life (est.) | 20–30+ years | 10–15 years | 7–10 years |
Coastal Suitability | Excellent | Limited | Poor |
Fabrication Performance | Excellent — no cracking | Good | Fair |
Coating Adhesion | High — no peeling | Moderate | Lower |
Lifecycle Cost (LCC) | Lowest | Medium | Higher |
HDG Replacement | Yes — direct drop-in | — | Partial only |
ZAM is not just coated steel — it is a lifecycle cost solution for solar mounting systems.
Easy Fabrication & Installation
MESCO ZAM steel is engineered to simplify the entire solar structure fabrication workflow, from coil slitting and roll forming to final installation on-site.
Processing Performance
✓Excellent roll forming: Consistent profile accuracy for C/Z purlins, rails & brackets
✓Smooth punching & cutting: Clean edges without burrs or delamination
✓Strong coating adhesion: No peeling or flaking during bending or press-braking
✓Minimal edge rust: Self-healing Zn-Al-Mg protects cut edges automatically
Compatible with standard equipment: No special tooling required
Installation Benefits
✓Lightweight advantage: Thinner gauge options for same strength, reducing logistics cost
✓No post-treatment required: No galvanizing touch-up needed after cutting
✓Faster installation: Pre-cut and pre-punched to project spec on request
✓Reduced on-site waste: Precise coil tolerances minimize material scrap
Safe handling: Smooth surface with no sharp galvanized spatter
Spain Solar Mounting Project – Real Case Study
Project Design :
This Spain solar mounting project is a real case delivered for a local photovoltaic installation, designed based on actual site conditions and engineering requirements.
The system was customized to adapt to Spain’s high solar exposure and variable climate, ensuring long-term structural stability. The design incorporates high-strength steel with anti-corrosion coating, making it suitable for both inland and coastal environments.
Through precise structural calculations, the project achieved an optimal balance between load-bearing performance and material efficiency, helping the client reduce overall project cost while maintaining durability. The mounting system is also compatible with multiple PV module types, providing flexibility for future expansion.
Assembly & Installation :
The mounting system is designed for fast and efficient on-site assembly, significantly reducing installation time and labor costs.
Key features include:
Modular design, with pre-engineered components for quick connection
Bolt-based assembly, minimizing the need for welding on-site
High installation accuracy, ensuring proper alignment of PV modules
Reduced labor intensity, enabling faster project completion
Clear installation guidelines and standardized components help contractors complete the project efficiently while maintaining consistent quality across all installations.
Unique Packing Design :
To support international shipping and reduce logistics costs, the project adopts a customized packing solution tailored for solar mounting components.
Highlights include:
Optimized container loading, maximizing space utilization and reducing freight cost. Component bundling strategy, making on-site identification and handling easier. Protective packaging, preventing damage during long-distance transportation. Labeling system, improving unloading efficiency and installation workflow
This unique packing design not only ensures product safety but also enhances overall project efficiency from factory to installation site.
Why Choose MESCO — China's Trusted ZAM Steel Manufacturer
Our Services
Manufacturing Excellence
✓Advanced production lines: Continuous Zn-Al-Mg hot-dip coating lines
✓Strict QC: ISO 9001 certified quality management system
✓In-house testing: Salt spray, tensile, bend, and coating adhesion tests
SGS / BV / third-party inspection: Supported on request
Frequently Asked Questions (FAQ)
Q1: Can ZAM steel replace HDG for solar mounting structures?
A: Yes. ZAM steel is a direct, cost-effective replacement for hot-dip galvanized (HDG) steel in most solar structure applications. It offers superior corrosion performance, especially in coastal, industrial, or high-humidity environments where HDG underperforms.
Q2: What is the expected lifespan of ZAM-coated steel?
A: MESCO ZAM steel typically delivers 2–3 times longer service life than standard galvanized steel, with an estimated 20–30+ years depending on environment and coating weight. The self-healing Zn-Al-Mg alloy layer significantly extends durability.
Q3: Is ZAM steel suitable for coastal or marine solar installations?
A: Yes. ZAM steel provides outstanding salt spray resistance (3,000+ hours in ASTM B117 testing), making it the preferred choice for coastal solar farms, floating PV systems, and offshore-adjacent environments where standard galvanized steel corrodes rapidly.
Q4: Does cutting or drilling damage the ZAM coating?
A: No. One of ZAM steel's most distinctive advantages is its self-healing property — the Zn-Al-Mg alloy migrates to exposed cut edges, forming a protective barrier that prevents edge rust. This is fundamentally different from traditional coatings that leave bare edges vulnerable.
Q5: What thicknesses and coating weights does MESCO supply?
A: MESCO offers ZAM steel from 0.8 mm to 4.0 mm in thickness, and coating weights from ZM120 to ZM275 g/m². Custom specifications are available for specific project requirements — contact our technical team for project-specific recommendations.
Q6: Can MESCO provide mill certificates and third-party inspection?
A: Yes. All MESCO ZAM steel coils come with full mill test certificates (MTC). Third-party inspection by SGS, Bureau Veritas (BV), or customer-designated inspectors is available upon request.
Q7: What is the minimum order quantity (MOQ)?
A: MESCO maintains a flexible MOQ policy to support solar projects of all sizes. Mixed-specification orders are welcome. Contact our sales team to discuss your project volume and get a tailored quotation.
- If the above model is not suitable for your workpiece, please tell us your need and then we can send you the most satisfying drawing.
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