Xi'an Dongmeng Group Co., Ltd. is one of the most reliable manufacturers and suppliers of carbon steel square tube in China, also supports customized service. With abundant experience, we warmly welcome you to wholesale cheap products in stock here and get free sample from our factory. For price consultation, contact us.
Carbon steel square tube is one of the most widely used structural steel hollow sections in modern engineering projects.
As a direct steel tube manufacturer and exporter, we supply ASTM A500, Q235, and Q345 grade square tubing designed for high load-bearing structures, fabrication systems, and infrastructure applications.
Compared with standard steel pipes, square tubing provides superior bending resistance, welding performance, and structural stability, making it the preferred material for contractors, EPC companies, and industrial buyers.
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High Quality
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Advanced Equipment
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Professional Team
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Custom Service
What is carbon steel square tube
Carbon Steel Square Tube (Carbon Steel Square Hollow Section / SHS / Steel Box Section / Mild Steel Square Pipe) is a high-strength structural steel profile widely used in construction, engineering, and industrial fabrication. Manufactured from premium-grade carbon steel such as Q235, Q345, ASTM A500 Grade B/C, it offers excellent weldability, machinability, and load-bearing performance for both light and heavy-duty applications.
Available in a wide range of standard and customized sizes from 20×20mm to 200×200mm, with wall thickness options from 1.2mm to 12mm, carbon steel square tubes are produced in compliance with international standards such as ASTM A500, EN 10219, and GB/T 6728. Surface finishes include black steel, hot-dip galvanized, pre-galvanized, and anti-corrosion coated, ensuring long service life even in harsh environments.
As a versatile structural material, Carbon Steel Square Tube is also known as SHS steel tube, square hollow section steel, structural steel square tubing, carbon steel box section, and mild steel hollow square pipe. It is widely applied in steel building frames, warehouse structures, bridges, machinery fabrication, conveyor systems, automotive components, solar mounting systems, and architectural frameworks.
With its combination of high strength, cost efficiency, dimensional accuracy, and global standard compliance, carbon steel square tubing is one of the most demanded steel profiles in global engineering and construction markets.
Why Engineers Choose Carbon Steel Square Tube
✔ High structural strength for heavy-load applications
✔ Excellent welding & fabrication performance
✔ Uniform geometry for easy installation
✔ Cost-efficient alternative to solid steel bars
✔ Available in hot rolled & cold formed types
✔ Suitable for both indoor & outdoor projects
Carbon Steel Square Tube Specification Table
| Item | Specification |
|---|---|
| Steel Grade | Q195 / Q235 / Q345 / ASTM A500 |
| Size Range | 10×10 mm – 1000×1000 mm |
| Wall Thickness | 0.5 – 60 mm |
| Length | 3m / 6m / 12m / Custom |
| Manufacturing | ERW / Seamless / Cold Formed |
| Surface | Black / Galvanized / Painted |
Size Chart (Metric & Imperial)
| Outer Size (mm) | Wall Thickness (mm) | Outer Size (inch) | Wall Thickness (inch) | Weight (kg/m) |
|---|---|---|---|---|
| 20 × 20 | 1.2 – 2.0 | 0.79 × 0.79 | 0.047 – 0.079 | 0.70 – 1.10 |
| 25 × 25 | 1.2 – 2.5 | 0.98 × 0.98 | 0.047 – 0.098 | 0.90 – 1.60 |
| 30 × 30 | 1.5 – 3.0 | 1.18 × 1.18 | 0.059 – 0.118 | 1.30 – 2.20 |
| 40 × 40 | 1.5 – 4.0 | 1.57 × 1.57 | 0.059 – 0.157 | 1.80 – 3.80 |
| 50 × 50 | 1.5 – 5.0 | 1.97 × 1.97 | 0.059 – 0.197 | 2.30 – 5.80 |
| 60 × 60 | 2.0 – 5.0 | 2.36 × 2.36 | 0.079 – 0.197 | 3.20 – 7.20 |
| 70 × 70 | 2.0 – 6.0 | 2.76 × 2.76 | 0.079 – 0.236 | 4.10 – 9.50 |
| 80 × 80 | 2.0 – 6.0 | 3.15 × 3.15 | 0.079 – 0.236 | 4.70 – 10.80 |
| 100 × 100 | 3.0 – 8.0 | 3.94 × 3.94 | 0.118 – 0.315 | 7.20 – 18.50 |
| 120 × 120 | 4.0 – 10.0 | 4.72 × 4.72 | 0.157 – 0.394 | 10.80 – 26.50 |
| 150 × 150 | 5.0 – 12.0 | 5.91 × 5.91 | 0.197 – 0.472 | 16.50 – 38.00 |
Key Notes for Buyers：
📌 Larger wall thickness = higher load-bearing capacity
📌 Common construction range: 20×20 mm to 150×150 mm
📌 Heavy structural use: 100×100 mm and above
📌 Custom sizes available for engineering projects
📌 Surface treatment affects corrosion resistance & lifespan
Application Engineering Mapping
🏗 Structural Engineering
Steel building frames
Warehouse structures
High-rise support systems
⚙ Industrial Manufacturing
Machinery frames
Conveyor systems
Equipment support structures
🚧 Infrastructure Projects
Bridges & highways
Tunnel support systems
Municipal engineering
🪑 Fabrication & OEM
Furniture frames
Metal processing parts
Custom steel fabrication
Carbon Steel Square Tube vs Round Pipe
| Feature | Square Tube | Round Pipe |
|---|---|---|
| Structural Strength | Higher | Medium |
| Installation | Easier | Complex |
| Load Distribution | Better | Normal |
| Fabrication | Easy welding | Limited |
| Space Efficiency | High | Low |
Quality Assurance
We implement strict quality control systems:
Ultrasonic testing (UT)
Chemical composition analysis
Mechanical strength testing
Dimensional tolerance inspection
Surface defect detection
Optional third-party inspection:
SGS / BV / TUV certification available
Packaging & Export Standard
Steel bundle packaging with straps
Waterproof plastic wrapping
Wooden case / pallet available
Container loading optimization
Export documentation support
Why Choose Us
✔ 20+ years steel export experience
✔ Direct manufacturer pricing
✔ Large stock for fast shipment
✔ Custom production capability
✔ OEM / project support
✔ Global EPC project supply experience
FAQ
Q1: What is carbon steel square tube used for?
Used in construction, machinery, and structural engineering.
Q2: What grade is best for construction?
ASTM A500 Grade B or Q345 is commonly used.
Q3: Can square steel tube be galvanized?
Yes, both hot-dip and pre-galvanized options are available.
Q4: What is delivery time?
Usually 7–15 days depending on order volume.
Contact us
👉 Get professional quotation within 2 hours
👉 Support custom sizes & project supply
👉 Global shipping available
📞 +8615769214734
📧 office@dongmjd.com
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