China Hollow Structural Section Steel Pipe Suppliers and Factory for Construction and Fabrication
☰ Product Overview
| Product | Square and Rectangular Steel Pipe |
| Material | Carbon Steel |
| Grade | Q195 = S195 / ASTM A53 Grade A |
| Q235 = S235 / ASTM A53 Grade B / ASTM A500 Grade A / STK400 / SS400 / ST42.2 | |
| Q345 = S355JR / ASTM A500 Grade B / ASTM A500 Grade C | |
| Standard | DIN 2440, ISO 65, EN10219, GB/T 6728 |
| JIS G3444, JIS G3466 | |
| ASTM A53, ASTM A500, ASTM A36 | |
| Surface | Bare / Natural black / Painted |
| Oiled with or without wrapping | |
| Ends | Plain ends |
| Specification | Square: 20×20 mm – 500×500 mm |
| Rectangular: 20×40 mm – 300×500 mm | |
| Wall Thickness: 1.0 mm – 30.0 mm | |
| Length: 2 m – 12 m |
★ Key Features
⚙
High Strength-to-Weight Ratio
Hollow cross-section provides excellent load-bearing capacity while minimizing material consumption.
🔧
Versatile Applications
Suitable for structural, mechanical, architectural, and industrial uses.
📈
Precise Dimensions
Manufactured to tight tolerances for consistent quality and ease of fabrication.
🔥
Excellent Weldability
Compatible with standard welding techniques for assembly and joining.
🌟
Multiple Finishes
Available in bare, painted, or oiled surfaces to suit different environmental conditions.
✂
Customizable Lengths
Can be cut to specific lengths per project requirements.
🛠 Application
| Application Area | Common Uses |
| 🏛Construction & Building | Structural support, building frameworks, architectural components |
| 🕐Structural Pipe | Load-bearing columns, trusses, industrial frameworks |
| 🚪Fence Posts | Perimeter fencing, security barriers, agricultural fencing |
| ☀Solar Mounting Components | Support structures for solar panels and mounting systems |
| 🛡Handrail Pipe | Stair railings, balcony railings, safety barriers |
? Frequently Asked Questions
Q
What sizes are available for square and rectangular steel pipes?
Square pipes are available from 20×20 mm up to 500×500 mm, while rectangular pipes range from 20×40 mm to 300×500 mm. Wall thickness ranges from 1.0 mm to 30.0 mm, and lengths can be supplied from 2 m to 12 m or cut to custom specifications.
Q
Which international standards do your steel pipes comply with?
Our square and rectangular steel pipes comply with multiple international standards including DIN 2440, ISO 65, EN10219, GB/T 6728, JIS G3444, JIS G3466, ASTM A53, ASTM A500, and ASTM A36, ensuring suitability for global projects.
Q
What surface finishes are available for the steel pipes?
We offer several surface finish options: bare / natural black, painted, and oiled — with or without wrapping. These options allow you to choose the best protection for your specific environmental conditions and project requirements.
Q
What steel grades are offered and what are their international equivalents?
We supply three main grades: Q195 (equivalent to S195 / ASTM A53 Grade A), Q235 (equivalent to S235 / ASTM A53 Grade B / ASTM A500 Grade A / STK400 / SS400 / ST42.2), and Q345 (equivalent to S355JR / ASTM A500 Grade B / ASTM A500 Grade C).
Q
Can the steel pipes be welded or fabricated on-site?
Yes. Our square and rectangular steel pipes offer excellent weldability and are compatible with standard welding techniques. They are also manufactured to tight dimensional tolerances, making them easy to cut, drill, and assemble during fabrication.
Q
What are the most common applications for square and rectangular steel pipes?
These pipes are widely used across industries including construction and building (structural support, frameworks), structural engineering (columns, trusses), fencing (perimeter and agricultural), solar energy (panel mounting structures), and safety infrastructure (handrails and balcony railings).