Overview
The 160x80x4 structural rectangular tube is a cold-formed steel profile with external dimensions of 160mm (height) × 80mm (width) and a uniform wall thickness of 4mm. Its rectangular cross-section provides superior bending resistance compared to round tubes, making it ideal for vertical and horizontal load-bearing applications. Standardized under Chinese GB/T 6728-2017 for dimensions and tolerances, it is widely produced through high-frequency welding (HFW) or cold drawing. The product is typically available in 6m or 12m lengths, with customized cutting services offered by manufacturers.
Structure and Working Principle
The tube's structural efficiency derives from its geometric design. The 4mm thickness balances material economy and strength, while the 160x80mm aspect ratio optimizes moment of inertia against multidirectional forces. Finite element analysis (FEA) shows peak stress distribution along the longer sides during loading. In assemblies, the flat surfaces facilitate bolted connections and welding. Unlike I-beams, the closed section resists torsional deformation. Common joint methods include end-plate welding for columns and sleeve connections for modular frameworks.
Key Features
1. Strength: Yield strength ranges 235-355 MPa depending on steel grade (Q235/Q355). The rectangular shape provides 15-20% higher bending stiffness than equivalent round tubes. 2. Versatility: Compatible with standard steel fabrication techniques including plasma cutting, drilling, and powder coating. Pre-drilled versions are available for specific applications like solar mounting systems. 3. Corrosion Options: Hot-dip galvanized (80-100μm coating) or painted variants extend service life in harsh environments by 3-5 times versus untreated tubes.
Application Areas
1. Construction: Primary use in prefabricated steel structures, including mezzanine floors, canopy supports, and bridge components. Often substitutes traditional H-beams in low-rise buildings. 2. Industrial Equipment: Framework for conveyor systems, automated warehouses, and heavy machinery guards. The dimensional accuracy (±0.5mm tolerance) ensures assembly precision. 3. Infrastructure: Used in signage gantries, bus shelters, and temporary event structures due to quick deployment advantages.
Maintenance and Precautions
Regular inspection for surface damage (scratches, dents) is critical, as these compromise structural integrity. For galvanized tubes, repair damaged zinc layers with cold galvanizing spray (≥94% zinc content). Avoid point-loading at unsupported mid-spans exceeding 1.5m. In seismic zones, follow connection reinforcement standards like GB 50011-2010. Storage should be on leveled surfaces with wooden spacers to prevent moisture trapping.
B2B Procurement Guide
1. Certification: Require mill test certificates (MTCs) confirming chemical composition and mechanical properties per GB/T 6728. For critical applications, specify third-party inspection (e.g., SGS). 2. MOQ: Standard production runs start at 3 tons; small-quantity orders may incur 15-20% surcharge. Lead times range 7-15 days for domestic orders. 3. Logistics: Container loading capacity is approximately 22-25 tons (40HQ container). Request edge protectors during transport to prevent deformation.
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