Square and rectangular hollow section usage
Square tube is the mainstream and key material for photovoltaic support systems due to its excellent structural performance and cost-effectiveness. Youfa brand square carbon steel pipes are widely used in solar support structure, and hot sale in Middle East and Africa.
Square rectangular tubes are widely used in the manufacturing of photovoltaic brackets due to their excellent mechanical properties and structural stability. Photovoltaic bracket is an important component of solar photovoltaic power generation system, mainly used to support and fix solar panels. The use of square rectangular tubes as support materials has the following advantages:
High strength: The cross-sectional shape of the rectangular tube gives it high strength when subjected to longitudinal and transverse loads, effectively resisting external factors such as wind pressure and snow pressure.
Good stability: The structural design of the square tube ensures good stability after installation, reducing deformation caused by external forces.
Easy to process: The processing of square and rectangular tubes is relatively simple, and can be cut, welded, and surface treated according to actual needs, making installation and maintenance convenient.
Lightweight: Compared to other materials, square rectangular pipes are lighter in weight, making them easier to transport and install, and reducing construction costs.
Corrosion resistance: Square rectangular pipes that have undergone surface treatment have good corrosion resistance and can adapt to various climatic conditions, extending their service life.
Economy: The production cost of square and rectangular tubes is relatively low, suitable for large-scale applications, and can effectively reduce the overall cost of photovoltaic power generation systems.
Good after-sales service: Youfa brand enjoys a good reputation in the market, providing high-quality after-sales service to ensure customer satisfaction during use.
Therefore, the application of square rectangular tubes in photovoltaic supports not only improves the performance of the supports, but also promotes the development of the photovoltaic industry.
Solar structure steel square and rectangular hollow section standards
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Standards
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GB/T 6728-2017
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ASTM A500-2023
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EN10219-1: 2006; EN10219-2: 2019
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Material Steel Grade
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Q195 Q235 Q355
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Grade A Grade B
Grade C
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S195 S235 S355JR
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Outside Diameter Tolerance
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(100mm away from the ends)
A=130mm: +/-1mm
A=140mm: +/-1.1mm
A=150 or 160 mm: +/-1.2mm
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(50mm away the ends)
65<A≤90mm: 0.6mm
90<A≤140mm: 0.8mm
A＞140mm: 0.01xA
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A<100: +/-1% (Min. 0.5mm) 100<A≤200mm: 0.8%
A＞200mm: 0.6%
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Thickness Tolerance
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WT≤10mm: +/-10%
WT＞10mm: +/-8%
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+/-10%
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WT≤5mm: +/-10%
WT＞5mm: 0.5mm
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R
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≤3WT
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≤3WT
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WT≤6mm: ≤2.4WT
6＜WT≤10mm: ≤3WT
WT＞10mm: ≤3.6WT
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Concavity and Convexity
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0.6%xA (Min0.4mm)
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0.8% (Min.0.5mm)
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Twist
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2mm+Lx0.5/1000mm
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A≤40: 1.3mm/m
40<A≤65: 1.6mm/m
65<A≤100: 1.9mm/m
100<A≤150: 2.2mm/m
150<A≤200: 2.5mm/m
200<A: 2.8mm/m
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2mm＋0.5mm/1m
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Squareness of side
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A≤100mm: 2mm
100<A≤300mm: 4mm
300<A≤500mm: 6mm
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90°+/-2°
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90°+/-1°
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Strightness
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0.15% of total length and 2mm over any 1m length
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10mm x L(m) /5
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0.15% of total length and 3mm over any 1m length
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Weld Bead Height
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-
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-
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WT≤14.2mm: 3.5mm
WT＞14.2mm: 4.8mm
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Post time: Oct-28-2025