Recently, Corigy just finished an order for a 500MW photovoltaic solar mounting bracket. The solar racking adopt Zn-Al-Mg steel material which the corrosion resistance is 5-10 times that of traditional galvanizing. And it is especially suitable for high humidity and coastal environments.

Raw Material Preparation

Substrate Selection: High-strength cold-rolled steel coil (S350GD + ZM275) is used to ensure mechanical properties.

Coating Treatment: The substrate is hot-dip coated with zinc-aluminum-magnesium (Zn-Al-Mg alloy, typically composed of Zn-11% Al-3% Mg). The coating thickness is typically 60-150g/m², providing excellent corrosion resistance and self-healing capabilities.

Uncoiling & Leveling

Uncoiling: Steel coil is fed into the production line via decoiler.

Leveling: Multi-roller leveler eliminates internal stresses and ensures flatness.

Progressive bending through a series of rollers to form C-shaped cross-sections

Automated hemming process

Imported high-precision hemming equipment is used, and the forming angle is precisely controlled by a CNC system. A single-step forming process ensures structural strength and reduces weld joints. The forming accuracy error is controlled within ±0.5mm, ensuring a perfect fit during subsequent assembly.

Intelligent punching processing

Equipped with a multi-station automatic punching center to achieve one-time accurate hole forming. Digitally control the punching position with a position accuracy of ±0.3mm. The automatic deburring system ensures that the edge of each hole is smooth and flat.

Cut to length

Cut the rails to the required length. Precise cutting, smooth cut without burrs.

Quality Inspection

1. Dimensional Inspection: Calipers and laser rangefinders verify cross-sectional dimensions, straightness, etc.

2. Coating Inspection: X-ray fluorescence (XRF) thickness gauges check coating thickness and composition.

3. Mechanical Testing: Tensile strength and yield strength testing (above 540 MPa) are performed on random samples.

Packaging and Storage

Packaging: Bundle to prevent scratching and label with specification and batch number.

Storage: Store in a dry environment to protect the coating from moisture.