The Square Steel Tubes supplied by Guojian Factory are made from national standard raw materials. After forming, they undergo a comprehensive hot-dip galvanizing treatment, featuring excellent straightness and excellent coating adhesion, making them highly suitable for projects such as photovoltaic car shelters, distributed photovoltaic installation systems, and steel structure shells.
Hot-dip galvanized square and rectangular tubes are hollow structural sections with a closed rectangular profile, manufactured through cold-forming steel strips, welding, and comprehensive hot-dip galvanizing for corrosion protection. Featuring excellent flexural strength and moderate self-weight, they are widely used as lightweight, load-bearing profiles in PV carports, steel structural frameworks, and outdoor enclosure projects.
The Square Steel Tube is immersed in a galvanizing bath, ensuring complete coverage—including edges and weld seams—without missed spots. This provides superior rust and corrosion resistance for outdoor use, making the product suitable for PV projects in diverse environments such as industrial sites, coastal mudflats, and suburban areas.
Precision factory straightening ensures controlled deformation and uniform assembly gaps for mounting structures and carport frames, reducing labor costs associated with on-site alignment and correction.
Supports services such as cut-to-length, pre-drilling of bolt holes, bending, and bevelling. Standardized factory prefabrication allows for direct on-site assembly, accelerating the grid-connection timeline for PV projects.
Stocking a wide range of sizes—from small, lightweight mounting accessories to heavy-duty carport main beams with thick walls—to accommodate everything from residential PV systems to large-scale industrial park carport projects.
Material certificates, galvanizing inspection reports, and factory conformity certificates are provided for every batch, meeting requirements for supervisory inspections and grid-connection documentation.
Integrated supply of PV mounting structures, fasteners, and foundation piles; coordinated solutions for superstructure frames and foundations facilitate unified supply schedule management for general contractors.
1. Main beam and secondary beam frameworks for PV carports in industrial/commercial parks and factory complexes
2. Load-bearing support frameworks for ground-mounted and rooftop distributed PV projects
3. Factory perimeter fencing, equipment rain shelters, and small steel-structure walkways
4. Support frameworks for residential PV systems in rural areas and protective frames for small energy storage units
1. Raw material verification: Spot checks on base material grade and wall thickness; strict control of negative tolerances to ensure structural load-bearing capacity
2. Forming process inspections: Monitoring welding quality and tube straightness; rejecting defective products with twisting or misalignment
3. Finished galvanized product inspections: Sampling to test zinc coating thickness and adhesion; preventing issues like peeling or uncoated spots
4. Deep processing verification: Double-checking hole dimensions and cut lengths to ensure compliance with construction drawings
5. Sorting and packaging: Bundling by specification and applying protective film to prevent transport-related impacts or damage to the zinc coating
Stock availability and photos/videos of the deep-processing workshop are available; on-site warehouse inspections and material sampling by customers are welcome.
A: Hot-dip galvanized tubes are preferred for outdoor PV carports and mounting structures due to their long-lasting rust resistance. Black tubes are suitable for short-term indoor structures; if used outdoors, subsequent anti-corrosion coating is recommended.
A: Yes. Simply provide the processing drawings; factory pre-fabrication offers higher precision and eliminates the need for on-site drilling.
A: Yes. Standard specifications are available for immediate shipment, while special wall thicknesses and lengths can be scheduled for production—ideal for large-scale PV cluster projects.
A: Standard stock items ship within 3–7 days. Orders requiring deep processing (bending, punching) typically take 7–12 working days; large orders can be delivered in batches.
A: Export is supported. We provide a full set of material certificates, galvanization test reports, and packing lists suitable for customs clearance for overseas new energy PV projects.
1. Packaging: Square Steel Tube are bundled by type with end protection and wrapped in protective film to prevent transport-related friction or scratches to the zinc coating;
2. Logistics: Export orders can be containerized; shipments are supported from various ports;
3. After-Sales: Profiles undergo strict quality inspection before leaving the factory. In the event of batch issues regarding coating or dimensions, we will verify the claims and negotiate replacement or rectification. Technical support is available for profile selection, preliminary frame load estimation, and coordination with steel structure construction.
1. Local warehousing base in Tianjin with ample stock; dedicated inventory for new energy PV profiles ensures rapid response to urgent orders;
2. Deep expertise in PV steel structures; familiar with material requirements for PV carports and mounting systems, offering selection advice tailored to actual project needs;
3. Supports integrated delivery with profile deep-processing, reducing on-site processing requirements for general contractors and helping ensure project schedules are met;
4. Full traceability; every batch comes with complete quality assurance documentation, ensuring a smooth process for tendering and grid-connection acceptance;
5. Coordinated supply of profiles, PV accessories, and foundation components—a one-stop solution for new energy steel structure projects.
Address
No. 2, Expressway Auxiliary Road, South Area of High-tech Industrial Park, Zitai Economic and Technological Development Zone, Tianjin, China
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