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Hot Dip Galvanized Square & Rectangular Steel Tube 20×20mm–400×400mm for Construction, Solar Mounting
Hot Dip Galvanized Square & Rectangular Steel Tube 20×20mm–400×400mm for Construction, Solar Mounting
Hot Dip Galvanized Square & Rectangular Steel Tube 20×20mm–400×400mm for Construction, Solar Mounting
Hot Dip Galvanized Square & Rectangular Steel Tube 20×20mm–400×400mm for Construction, Solar Mounting
Hot Dip Galvanized Square & Rectangular Steel Tube 20×20mm–400×400mm for Construction, Solar Mounting
Hot Dip Galvanized Square & Rectangular Steel Tube 20×20mm–400×400mm for Construction, Solar Mounting
Hot Dip Galvanized Square & Rectangular Steel Tube 20×20mm–400×400mm for Construction, Solar Mounting
Hot Dip Galvanized Square & Rectangular Steel Tube 20×20mm–400×400mm for Construction, Solar Mounting
Specifications
Brand Name :
talat
Model Number :
Galvanized steel pipes
Certification :
manufacture certificate
Place of Origin :
China
MOQ :
1ton
Price :
negotiate
Payment Terms :
L/C,T/T,Western Union
Supply Ability :
10000tons
Delivery Time :
7-15days
Packaging Details :
Standard seaworthy export packing or as customer demands
Product name :
Zinc-coated Steel Square and Rectangular Tubes
Type Of Coating :
Zinc coated
Material :
Q195, Q215, Q235, Q355, ASTM A500, ASTM A36
Size :
20×20mm–400×400mm
Usage :
Construction, Solar Mounting
Zinc coating :
40 g/m² – 275 g/m²
Surface Finish :
Silver-gray zinc coating, smooth and uniform
Shape :
square & rectangular
Description
Hot Dip Galvanized Square & Rectangular Steel Tube 20*20mm–400*400mm for Construction, Solar Mounting
Product Description

Galvanized Square Tubes and Rectangular Tubes are hollow structural steel sections manufactured from high-quality carbon steel and protected with a zinc coating through hot-dip galvanizing or electro-galvanizing processes. The zinc layer provides excellent corrosion resistance, making these tubes ideal for outdoor and industrial applications.

Our galvanized steel tubing is available in a wide range of sizes, from 20*20 mm to 400*400 mm and beyond, with wall thicknesses ranging from 0.8 mm to 12 mm. These products are widely used in construction, steel structures, solar mounting systems, agricultural equipment, machinery manufacturing, transportation infrastructure, and industrial projects.

The durable galvanized coating significantly extends service life while reducing maintenance costs, making galvanized square and rectangular steel tubes a cost-effective solution for long-term structural applications.

Many engineers default to square or round hollow sections for structural projects without considering the specific load direction. In applications where bending occurs primarily along one axis – such as roof purlins, trailer frames, crane runways, or mezzanine floors – square tubes often provide unnecessary strength in the vertical direction while lacking depth in the bending plane. Round tubes, on the other hand, are inefficient for beam applications due to their lower section modulus. Additionally, ordinary non-galvanized rectangular tubes suffer from rapid corrosion in outdoor or humid environments, especially at weld joints and cut ends, leading to costly maintenance and potential structural failure.

Cause

Steel structures exposed to moisture, rain, chemicals, and changing weather conditions are vulnerable to rust and corrosion. Traditional black steel tubes may deteriorate quickly when used outdoors or in harsh environments, leading to:

  • Reduced structural strength
  • Increased maintenance costs
  • Shortened service life
  • Safety risks in construction projects
  • Higher replacement expenses

Industries such as construction, solar energy, agriculture, and infrastructure require steel products with enhanced corrosion resistance and long-term durability.

Solution

Galvanized square and rectangular steel tubes solve these challenges by applying a protective zinc coating over the steel surface.​

Benefits of Galvanized Coating:

  • ✔ Excellent corrosion resistance​
  • ✔ Extended service life​
  • ✔ Lower maintenance requirements​
  • ✔ Enhanced weather resistance​
  • ✔ Better appearance and surface protection​
  • ✔ Cost-effective long-term investment​

The zinc layer acts as a sacrificial barrier that protects the steel substrate even when minor scratches or surface damage occur.

Product Specifications
Parameter Details
Material Q195, Q235B, Q355B (or equivalent)
Size range 20x20mm, 25x25mm, 30x30mm, 40x40mm, 50x50mm, 60x60mm, 80x80mm, 100x100mm, 150x150mm, 200x200mm
Wall thickness 1.0mm – 5.0mm (custom available)
Length 6m, 5.8m, or customized (max 12m)
Zinc coating thickness 45µm – 90µm (as per ASTM A123 / EN ISO 1461)
Standard ASTM A500, EN 10219, GB/T 6728
Surface treatment Hot dip galvanized, smooth and bright
Tolerance According to international standard

Note: Custom sizes, thicknesses, and higher zinc coating can be produced upon request.

Common Square Tube Sizes
  • 20*20 mm
  • 25*25 mm
  • 40*40 mm
  • 50*50 mm
  • 75*75 mm
  • 100*100 mm
  • 150*150 mm
  • 200*200 mm
  • 300*300 mm
  • 400*400 mm
Common Rectangular Tube Sizes
  • 20*40 mm
  • 30*50 mm
  • 40*80 mm
  • 50*100 mm
  • 80*120 mm
  • 100*150 mm
  • 200*100 mm
  • 250*150 mm
  • 400*200 mm
  • 1000*800 mm
Application

Galvanized square and rectangular tubes are extensively used across various industries:

Construction Industry
  • Building frameworks
  • Structural supports
  • Warehouses
  • Residential projects
Solar Energy Systems
  • Solar panel mounting structures
  • PV support brackets
  • Renewable energy projects
Steel Structure Engineering
  • Industrial workshops
  • Factory buildings
  • Steel platforms
  • Equipment supports
Transportation Infrastructure
  • Highway guardrails
  • Airport facilities
  • Railway projects
  • Municipal engineering
Agricultural Applications
  • Greenhouse structures
  • Livestock equipment
  • Irrigation systems
Mechanical Manufacturing
  • Machinery frames
  • Equipment racks
  • Conveyor systems
Packaging & Delivery
  • Packing (Bundles / Seaworthy Packaging)
  • Tagging
  • Weight Checking
  • Trucking / Shipment
Hot Dip Galvanized Square & Rectangular Steel Tube 20×20mm–400×400mm for Construction, Solar Mounting
How To Choose

Selecting the right galvanized tube depends on project requirements.

Choose Hot-Dip Galvanized Tubes If:
  • Outdoor installation is required
  • Long-term corrosion resistance is important
  • Coastal or humid environments are involved
  • Heavy-duty structural applications are needed
Choose Electro-Galvanized Tubes If:
  • Indoor applications are planned
  • A smoother surface finish is preferred
  • Lower cost is a priority
  • Moderate corrosion resistance is acceptable
Consider These Factors
  1. Required load-bearing capacity
  2. Environmental conditions
  3. Zinc coating thickness
  4. Tube dimensions
  5. Project service life
  6. Budget requirements
FAQ

Q1: Are these galvanized square tubes suitable for outdoor use in coastal areas?

Yes. Hot-dip galvanized tubes provide excellent corrosion resistance even in salt-laden coastal environments. For maximum protection, we recommend a thicker zinc coating (≥70µm) and regular visual inspection.

Q2: Can I weld or cut the galvanized tube without damaging the coating?

Welding and cutting are possible, but they will remove the zinc coating in the heat-affected zone. After fabrication, we recommend applying cold galvanizing spray or zinc-rich paint to the welded or cut areas to restore corrosion protection.

Q3: What is the difference between hot-dip galvanized and electro-galvanized square tubes?

Hot-dip galvanizing applies a much thicker and more durable zinc coating (40-85µm) through a molten zinc bath, providing superior outdoor corrosion resistance. Electro-galvanizing applies a thin coating (5-15µm) and is intended for indoor or light-duty applications only. For structural and outdoor uses, always choose hot-dip galvanized.

Q4: Do you provide custom sizes or special material grades?

Yes. We accept OEM orders for non-standard sizes, wall thicknesses, lengths, and higher steel grades such as Q355B. Please contact our sales team with your drawing or requirements.

Q5: How long will the galvanized coating last?

In typical rural or urban environments, the coating life exceeds 20-30 years. In severe industrial or coastal environments, the expected life is 15-25 years, depending on the coating thickness and local conditions.

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Hot Dip Galvanized Square & Rectangular Steel Tube 20×20mm–400×400mm for Construction, Solar Mounting

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Product Detail
Brand Name :
talat
Model Number :
Galvanized steel pipes
Certification :
manufacture certificate
Place of Origin :
China
MOQ :
1ton
Price :
negotiate
Contact Supplier
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Hot Dip Galvanized Square & Rectangular Steel Tube 20×20mm–400×400mm for Construction, Solar Mounting
Hot Dip Galvanized Square & Rectangular Steel Tube 20×20mm–400×400mm for Construction, Solar Mounting
Hot Dip Galvanized Square & Rectangular Steel Tube 20×20mm–400×400mm for Construction, Solar Mounting
Hot Dip Galvanized Square & Rectangular Steel Tube 20×20mm–400×400mm for Construction, Solar Mounting

Wuxi Talat Steel Co., Ltd.

Verified Supplier
1 Years
jiangsu, wuxi
Since 2013
Business Type :
Manufacturer, Distributor/Wholesaler
Main Products :
Stainless Steel Sheet, Steel Tin Plate, Electrolytic Tinplate Coil
Total Annual :
4000,000-6000,000
Employee Number :
50~60
Certification Level :
Verified Supplier
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