National Standard Hot-Dip Galvanized Square and Rectangular Tubes

Xinlida Steel Pipe's national standard hot-dip galvanized square and rectangular tubes are hollow steel components made from high-quality steel strips or plates through cold bending, precision welding, or hot rolling processes. Their cross-section is a standard rectangle with all internal angles at a standard 90°. They are mainly used in load-bearing, support, and frame structures. National standard hot-dip galvanized square and rectangular tubes reduce weight by 30%-50%, increasing mileage by 12% in vehicle applications. This lightweight advantage significantly reduces transportation and installation costs. The flat contact surface design provides more connection methods, improving installation efficiency by 40% compared to round steel tubes, with node connection accuracy reaching ±0.1 mm.

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Product Description

National standard hot-dip galvanized square and rectangular tubes are made from high-quality steel strips through cold bending, precision welding, or hot rolling processes. This product is a hollow steel component with a standard rectangular cross-section and regular 90° internal angles. It combines lightweight and high strength, directly replacing traditional solid steel, offering significant advantages in material saving and efficient assembly. National standard hot-dip galvanized square and rectangular tubes have a uniform and bright zinc coating, providing rust and corrosion resistance; straight edges, thick walls, smooth welds, fine workmanship, and a neat and aesthetically pleasing appearance.

Xinlida Steel Pipe's national standard hot-dip galvanized square and rectangular tubes are hollow steel components made from high-quality steel strips through cold bending and precision welding (or hot rolling) processes. Their standard rectangular cross-section has regular 90° interior angles. The core function of rectangular steel tubes is load-bearing, support, and frame structure construction. Common specifications include 20*20#, 20*40#, 30*30#, 30*50#, 50*50#, 40*60#, 80*80#, 60*80#, 100*100#, and 200*200#.

Advantages and highlights	Core Values	Quantitative protection
Directional bending strength	The greater the moment of inertia along the longer side, the higher the stability of the material under stress.	80×120 mm: The bending stiffness of this model is 1.8 times that of a round pipe of the same specification.
Lightweight and energy-saving	Reduce transportation and installation costs, and meet lightweight requirements.	Compared to solid steel of equivalent strength, this material can reduce weight by 30%-50% and increase vehicle range by 12%.
High-efficiency assembly	Large flat contact surface, multiple connection methods	The installation efficiency is 40% higher than that of circular pipes, and the node connection accuracy is±0.1 mm.
Corrosion resistant and durable	Professional surface treatment, suitable for harsh environments	The hot-dip galvanized layer thickness is≥65μm, and no red rust appears after a 480-hour salt spray test.
Full specification coverage	It is suitable for various working environments and does not require modification of secondary materials.	The cross-sectional dimensions covered range from 20×10 mm to 800×600 mm, and the wall thickness ranges from 0.8 mm to 25 mm.

Specification Selection Table

Common specifications (cross-sectional dimensions×wall thickness)	Recommended materials	Yield strength	Surface treatment	Applicable Scenarios	Implementation Standards
20*20#	Q195-Q235	≥235 MPa	Cold-rolled steel sheet/painting	Small equipment frames, decorative parts	GB/T 6728-2017
20*40#	Q195-Q235	≥345MPa	Hot-dip galvanizing	Photovoltaic brackets, street light poles	GB/T 6728-2017
30*50#	Q195-Q235	≥345MPa	Hot-dip galvanizing/plastic coating	Construction of trusses and bridge supports	GB/T 6728-2017
50*50#	Q195-Q235	≥345MPa	Hot-dip galvanizing	Municipal streetlights and traffic sign poles	GB/T 3094-2017
40*60#，	高强度钢	≥460MPa	Spray method/Electrophoresis	New energy commercial vehicle chassis	GB/T 3094-2017
Customized specifications	Q195-Q235Stainless steel/low temperature resistant steel	Match on demand	Customization on demand	Special projects and special equipment	National Standards/Customized Standards

Product application areas

1. Construction field

Application areas: Steel structure workshops, conference center trusses, curtain wall beams of super high-rise buildings. Case study: A provincial conference center used 150×300×8 mm Q235 rectangular tubes as the main truss, achieving a span of 120 meters, reducing the overall structural weight by 25%, and shortening the construction period by 30 days.

2. New Energy Sector

Application areas: Photovoltaic support systems, internal support structures for wind turbine towers. Case study: A 100 MW photovoltaic power station uses an 80×40×3 mm hot-dip galvanized rectangular tube support structure, with a wind resistance rating of 12, a service life of 25 years, and a 60% reduction in maintenance costs.

3. Vehicle Industry

Application areas: New energy commercial vehicle frames, crash beams, and seat frames. Case study: A new energy commercial vehicle uses 100×50×4 mm high-strength steel rectangular tubing to manufacture its frame, achieving an 18% reduction in vehicle weight, a 12% increase in driving range, and a 25% improvement in collision energy absorption performance.

4. Industrial and municipal sectors

Application areas: street light poles, traffic sign poles, industrial equipment bases. Case study: A municipal road renovation project adopted 200×100×5 mm rectangular tube street light poles. This pole type can withstand winds up to level 10, improves installation efficiency by 50%, and has a service life of up to 30 years.

Why choose our Xinlida Steel Pipe's national standard hot-dip galvanized square and rectangular tubes?

Boosting production capacity and delivery efficiency: With ample inventory exceeding 20,000 tons and convenient transportation services provided by 7 branches, delivery cycles are only 7 to 15 days, far shorter than the industry average of 15 to 30 days. All specifications of national standard hot-dip galvanized square and rectangular tubes are available immediately, completely eliminating long waiting times.

More reliable technology and quality: Employing laser-arc hybrid welding technology, the weld defect rate is less than 0.02%, and dimensional tolerances are controlled within ±0.1 mm. Compared with industry standard resistance welding (defect rate of 0.1%-0.5%, tolerance of ±0.3 mm), its quality is more stable.

Thoughtful Customization and Service: Supports comprehensive customization of cross-sections, materials, and surface treatments, with a response time as fast as 48 hours. It provides one-stop processing services, breaking through the industry's limitations of limited customization scope and response times exceeding 72 hours.

Higher Cost Efficiency: Self-produced raw materials combined with intelligent production lines reduce intermediate steps, resulting in prices for products of the same specifications that are 3%-5% lower than the industry average, while offering superior performance. This avoids the situation where industry products are priced too high but only meet standard requirements. Enhanced Corrosion Resistance: Product quality is controlled by its own galvanizing plant, with a hot-dip galvanized layer thickness ≥ 65μm. After 480 hours of salt spray testing, no red rust appears, far exceeding the corrosion resistance standards of outsourced galvanizing processes (zinc layer thickness ≤ 50μm, salt spray test time approximately 240 hours).