Galvanized Square & Rectangular Steel Tubes for Structural
Engineering | SHS & RHS Hollow Sections
Product Overview
Galvanized Square Hollow Sections (SHS) and Rectangular Hollow
Sections (RHS) are structural steel tubes manufactured through
electric resistance welding (ERW) and protected with a
high-performance zinc coating. Designed for demanding engineering
environments, these hollow sections combine excellent mechanical
properties with outstanding resistance to corrosion.
Their closed-section geometry provides greater torsional rigidity
than open steel profiles while maintaining a lower structural
weight. This makes galvanized hollow sections a preferred material
for construction, infrastructure, transportation, renewable energy,
and industrial manufacturing.
Available in multiple steel grades and international standards,
galvanized square and rectangular tubes can be customized to meet
different fabrication and structural requirements.
Why Galvanized Hollow Sections Are Preferred
Modern engineering projects demand materials that perform reliably
over decades, not just during installation.
Galvanized hollow sections offer important advantages:
- Longer service life than untreated carbon steel
- Consistent structural performance
- Reduced maintenance requirements
- Improved appearance after years of outdoor exposure
- Excellent compatibility with fabrication processes
For projects exposed to rain, humidity, industrial pollution, or
coastal conditions, galvanized tubing provides a practical and
economical corrosion-control solution.
Specifications
| Item | Specification |
|---|
| Product Name | Galvanized Square Tube / Galvanized Rectangular Tube |
| Steel Grade | Q195, Q235, Q355, ASTM A500 Grade B/C |
| Manufacturing Process | Cold Formed ERW Hollow Section |
| Shape | Square Hollow Section (SHS) |
| Outer Size | 20*20 mm – 500*500 mm |
| Wall Thickness | 0.8 mm – 16 mm |
| Length | 3m, 6m, 9m, 12m or Customized |
| Zinc Coating | 60–275 g/m² |
| Standard | ASTM A500, EN10219, JIS, GB |
| Processing Service | Cutting, Drilling, Punching, Welding |
| Packaging | Standard Export Seaworthy Package |
Material Advantages
High Structural Efficiency
The hollow section design provides excellent bending resistance
while reducing overall weight, helping improve material efficiency
in structural applications.
Durable Zinc Protection
The zinc layer protects the steel surface against oxidation and
moisture. Even when the coating is locally damaged, surrounding
zinc continues protecting the exposed steel through sacrificial
action.
Consistent Dimensional Accuracy
Modern forming equipment ensures precise dimensions, straightness,
and wall thickness, supporting easier installation and
fabrication.
Flexible Processing
Galvanized tubes can be supplied ready for fabrication, including
customized cutting, punching, beveling, or other secondary
processing operations.
Recommended Applications
Steel Buildings
- Warehouse structures
- Factory workshops
- Commercial buildings
- Roof truss systems
Renewable Energy
- Solar panel mounting systems
- Ground support structures
- Energy storage facilities
Public Infrastructure
- Traffic sign supports
- Pedestrian railings
- Airport construction
- Utility frameworks
Industrial Equipment
- Machine frames
- Material handling systems
- Storage racks
- Conveyor supports
Agriculture
- Greenhouse construction
- Livestock shelters
- Irrigation structures
- Agricultural equipment
How It Works
Galvanized square and rectangular tubes achieve long-term
durability through a dual corrosion protection system.
Protective Coating
A continuous zinc layer isolates the steel substrate from water,
oxygen, and atmospheric contaminants.
Electrochemical Protection
When scratches or exposed areas occur, zinc corrodes before steel,
helping prevent rust from spreading beneath the coating.
This mechanism significantly extends the operational life of the
steel tube under normal service conditions.
Product display
How To Select the Best Galvanized Tube
Selecting the correct hollow section depends on the intended
application.
Consider Structural Load
Large-span structures require thicker walls and larger section
sizes to improve load-bearing performance.
Consider Exposure Conditions
Projects in coastal, marine, or industrial environments should use
hot-dip galvanized tubes with heavier zinc coatings.
Consider Fabrication Requirements
If the project involves robotic welding, CNC cutting, or automated
assembly, ensure dimensional tolerances meet production
requirements.
Consider International Standards
For export projects, selecting products manufactured according to
ASTM, EN, or JIS standards can simplify project approval and
compliance.
FAQ
Q1: What is the difference between SHS and RHS?
Square Hollow Sections (SHS) have equal sides and are commonly used
where symmetrical loading is required, while Rectangular Hollow
Sections (RHS) provide higher bending efficiency in one direction
and are suitable for beams and frames.
Q2: Can galvanized tubes be used in marine environments?
Yes. Hot-dip galvanized tubes with appropriate zinc coating
thickness are suitable for many coastal and marine-adjacent
applications, depending on project design requirements.
Q3: Are custom fabrication services available?
Yes. Cutting, drilling, punching, beveling, laser processing, and
other fabrication services can be provided before shipment.
Q4: Which steel grades are most commonly supplied?
Q235, Q355, ASTM A500 Grade B, and Grade C are among the most
frequently requested grades for structural applications.
Q5: How do galvanized tubes reduce project costs?
Their extended service life and reduced maintenance requirements
help lower total lifecycle costs compared with untreated steel.
