For high-corrosion environments such as coastal tidal flats, saline-alkali soils, and chemical industrial parks, ShixinDa's thickened Zinc Aluminum Magnesium C Channel are recommended, offering a service life of 15–22 years; these profiles can also operate effectively for over 12 years in extreme salt spray coastal environments. The product features a unique magnesium ion self-healing function, eliminating the need for repainting or anti-corrosion treatment on cut or drilled sections, thereby preventing premature corrosion at joints at their source.
In comparison, under identical operating conditions, conventional hot-dip galvanized C-section steel products will corrode through within only 8–12 years in inland areas and 2–5 years in coastal areas. ShixinDa's products comply with the 25-year design service life standard for photovoltaic applications, require no anti-corrosion maintenance throughout their entire lifecycle, and reduce the overall lifecycle cost by more than 20%; they are therefore the preferred choice for outdoor engineering applications as a replacement for traditional galvanized profiles.
Zinc Aluminum Magnesium C Channel (industry abbreviation: ZAM C-section steel or zinc-aluminum-magnesium cold-formed C-profiles) is a C-shaped open cold-formed steel structural profile manufactured by integrating the cold bending and rolling processes on a single machine, using a continuous hot-dip galvanized aluminum-magnesium alloy-coated steel strip (ZAM) as the base material.
Cross-section configuration: The standard C-shaped cross-section consists of a web, upper and lower flanges, and an internally curved reinforcing edge (lip); it features standardized long circular holes or bolt holes.
Coating composition: ternary alloy coating; standard composition ratio: Zn 85%–90%, Al 3%–6%, Mg 1.5%–3%; trace amounts of silicon are added to enhance the coating's adhesion; complies with the YB/T 4457-2022 and Q/BQB 420 standards;
Molding process: Cold bending at room temperature; no thermal deformation; high dimensional accuracy; no need for secondary anti-corrosion spraying; can be directly assembled upon leaving the factory;
Unlike conventional galvanized C-section steel: the coating contains magnesium, provides self-healing capability for cuts, and significantly enhances its corrosion resistance rating.
Photovoltaic Industry (Core Sector): ground-mounted PV mounting systems, rooftop distributed PV systems, PV carports, floating PV systems, and agricultural-PV complementary mounting system main beams/secondary beams;
Building steel structures: roof purlins for factory buildings, wall purlins, lightweight steel keel systems, and prefabricated factory building frames;
Industrial supporting facilities: equipment racks, piping supports, warehouse shelving, outdoor steel structure platforms, and municipal corrosion-resistant supports.
Load-bearing main beam / secondary beam: bears wind loads, snow loads, and the self-weight of equipment, enabling lightweight yet high-strength support;
Modular assembly carrier: features pre-drilled standard mounting holes to accommodate photovoltaic fixtures, bolts, and connectors, enabling rapid assembly;
Long-lasting corrosion-resistant structural components: replacing hot-dip galvanizing and aluminum alloys, suitable for coastal, saline-alkali, industrial corrosive, and high-humidity harsh environments;
Lightweight load-reducing components: compared with hot-rolled steel sections, their self-weight is reduced by 30%–50%, thereby reducing the civil engineering loads on roofs and foundations.
The neutral salt spray test duration is ≥3,000 hours with no red rust; in contrast, conventional hot-dip galvanizing only lasts 500–600 hours; under identical environmental conditions, its service life is 4–10 times longer than that of hot-dip galvanized products, enabling stable operation for 25–30 years in photovoltaic projects;
Resistant to chloride ions, salt-alkali environments, and corrosion from industrial exhaust gases; the ideal choice for coastal tidal flats, aquaculture zones, and chemical industrial parks.
The incision self-heals, eliminating the need for on-site repainting.
The exposed cross-sections resulting from cutting, drilling, and grinding allow magnesium ions in the plating layer to migrate upon contact with water vapor, forming a dense alkaline protective film that automatically seals the corrosion initiation point; in contrast, standard galvanized cuts are highly prone to rusting, requiring additional cold-sprayed zinc coating for repair after installation, thereby reducing labor costs by 5%–10%.
The coating exhibits high flexibility: it does not peel or delaminate even when bent at 180°; it is resistant to damage during punching, cutting, and bending processes, making it suitable for full-process automated production.
High strength combined with lightweight design results in lower overall costs.
The mainstream substrate material is S350GD/S450GD high-strength steel, with a yield strength ≥ 350 MPa; even thin sections can adequately support the required loads;
The procurement cost of this steel bracket is more than 15% lower than that of aluminum alloy brackets; while the initial construction cost is slightly higher than that of hot-dip galvanized brackets, it eliminates subsequent anti-corrosion maintenance, resulting in a reduction of the overall lifecycle cost by 20%–30%.
Standard precast long-round holes with modular splicing; no on-site welding or anti-corrosion treatment required;
Chromium-free passivation coating; production is free of heavy pollution and complies with the green building materials standards for new energy applications;
Features a unified silver-gray matte finish with a clean appearance, eliminating the need for additional paint spraying for aesthetic enhancement.
It covers all application scenarios—including inland areas, coastal regions, high-humidity environments, saline-alkali zones, wind-sand areas, floating water bodies, and agricultural greenhouses—offering far greater versatility than traditional galvanized profiles.
|
specifications and models（mm） |
Web height H (mm) |
Web width B (mm) |
Lip width C (mm) |
wall thickness t（mm） |
Main application scenarios |
|
41×41×10×1.5 |
41 |
41 |
10 |
1.5 |
Photovoltaic mounting system secondary beams, rooftop distributed photovoltaic systems |
|
41×41×10×1.8 |
41 |
41 |
10 |
1.8 |
Photovoltaic mounting system main beam, conventional purlins |
|
41×41×10×2.0 |
41 |
41 |
10 |
2.0 |
Photovoltaic carports, agrivoltaic mounting systems |
|
60×40×12×2.0 |
60 |
40 |
12 |
2.0 |
Factory building wall purlins and equipment racks |
|
80×50×15×2.5 |
80 |
50 |
15 |
2.5 |
Factory roof purlins and medium-sized steel structures |
|
100×50×15×3.0 |
100 |
50 |
15 |
3.0 |
Heavy-load industrial workshops, large-span photovoltaic mounting systems |
|
120×60×20×3.0 |
120 |
60 |
20 |
3.0 |
Large-scale steel structure platforms and warehouse shelving systems |
|
Custom specifications |
20~400 |
15~200 |
8~60 |
1.5~4.0 |
Customized processing for non-standard items |
ShixinDa zinc-aluminum-magnesium C-section steel offers comprehensive performance advantages over traditional hot-dip galvanized C-section steel. Leveraging integrated manufacturing processes from the original manufacturer and rigorous quality control, these outdoor long-term corrosion-resistant profiles are designed for applications such as photovoltaic mounting systems, factory roof trusses, and coastal corrosion protection projects. The products utilize high-strength S350GD/S450GD zinc-aluminum-magnesium base materials, featuring a ternary alloy coating that passes salt spray tests for over 3,000 hours; their corrosion resistance lifespan is 4–10 times longer than that of conventional galvanized profiles. Additionally, the magnesium ions possess inherent self-healing properties at cut edges, eliminating the need for on-site recoating with zinc after cutting or drilling, thereby significantly reducing construction labor and auxiliary material costs.
ShixinDa's fully automatic cold bending production line offers high forming accuracy; the profiles are bent without losing zinc or peeling, with a uniform matte surface free of zinc inclusion defects. The product range covers both photovoltaic-specific profiles for the 41 series and full-size building purlins, with wall thicknesses ranging from 1.5 to 4.0 mm and customizable options available. Standard long round holes are pre-drilled for easy installation, significantly enhancing modular assembly efficiency. Featuring a lightweight yet high-strength design, these profiles achieve lower self-weight under equivalent load conditions, thereby reducing the structural load on civil engineering foundations. They are suitable for harsh environments such as areas with strong winds, heavy snowfall, saline-alkali conditions, or coastal regions with high corrosion rates, enabling photovoltaic projects to operate stably for up to 25 years without requiring maintenance.
Compared with conventional galvanized C-section steel profiles, ShixinDa's products can offset the initial procurement price differential through zero maintenance costs, reducing the overall lifecycle cost by more than 20%. By offering direct supplier-to-customer delivery without intermediaries, our products feature ample stock availability and rapid delivery upon custom length cutting. Throughout the entire production process, strict compliance with national standards YB/T 4457 and GB/T 6728 is ensured, with rigorous quality inspections at every stage—from raw materials and forming to final outbound shipment—thereby balancing performance, construction timeline, and long-term cost-effectiveness. These products represent an optimal choice for outdoor steel structures and photovoltaic projects as a viable alternative to traditional galvanized profiles.
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