China Suppliers and Factory for Hollow Structural Section Steel Pipe: Square and Rectangular Profiles for Construction
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 grades of steel are available for square and rectangular steel pipes?
We supply square and rectangular steel pipes in 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), covering a wide range of international standards.
Q What size ranges 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 options span from 1.0 mm to 30.0 mm, and standard lengths range from 2 m to 12 m. Custom lengths can also be arranged upon request.
Q What surface treatment options are available?
Our steel pipes are available in bare (natural black), painted, or oiled finishes. They can also be supplied with or without wrapping, depending on your storage, transport, or end-use requirements.
Q What 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 compatibility with global project specifications.
Q Are these steel pipes suitable for outdoor and structural applications?
Yes. Square and rectangular steel pipes are widely used in construction frameworks, load-bearing columns, trusses, fence posts, solar panel mounting structures, and handrail systems. With appropriate surface treatment, they perform reliably in both indoor and outdoor environments.
Q Can the steel pipes be customized to specific project requirements?
Absolutely. We offer customizable lengths, dimensions, wall thicknesses, grades, and surface finishes to meet specific project needs. Our pipes are also manufactured to tight tolerances, making them easy to fabricate and weld on-site.