China Hollow Structural Section Steel Pipe Factory & Suppliers 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
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⚖️High Strength-to-Weight Ratio Hollow cross-section provides excellent load-bearing capacity while minimizing material consumption.
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🔧Versatile Applications Suitable for structural, mechanical, architectural, and industrial uses.
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📐Precise Dimensions Manufactured to tight tolerances for consistent quality and ease of fabrication.
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🔥Excellent Weldability Compatible with standard welding techniques for assembly and joining.
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🎨Multiple Finishes Available in bare, painted, or oiled surfaces to suit different environmental conditions.
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✂️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
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What is the difference between square and rectangular steel pipes?
Square steel pipes have equal width and height dimensions (e.g., 50×50 mm), while rectangular steel pipes have different width and height dimensions (e.g., 50×100 mm). Both are hollow structural sections made from carbon steel, but rectangular pipes are often preferred when directional strength or specific spatial fitting is required.
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What steel grades are available for square and rectangular steel pipes?
We offer three main grades: Q195 (equivalent to S195 / ASTM A53 Grade A), Q235 (equivalent to S235 / ASTM A53 Grade B / ASTM A500 Grade A / SS400), and Q345 (equivalent to S355JR / ASTM A500 Grade B & C). These cover a wide range of structural and mechanical application requirements.
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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 construction and engineering specifications.
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Can the steel pipes be customized in terms of length and surface finish?
Yes. Pipes can be cut to specific lengths ranging from 2 m to 12 m based on project requirements. Surface finish options include bare/natural black, painted, or oiled — with or without wrapping — to accommodate different environmental and storage conditions.
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What are the typical applications for square and rectangular steel pipes?
These pipes are widely used in construction and building frameworks, structural load-bearing columns and trusses, fence posts, solar panel mounting systems, and handrail or safety barrier installations. Their versatility makes them suitable for both light and heavy-duty structural applications.
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What size range is available for square and rectangular steel pipes?
Square pipes are available from 20×20 mm up to 500×500 mm, and rectangular pipes range from 20×40 mm up to 300×500 mm. Wall thickness options span from 1.0 mm to 30.0 mm, providing a comprehensive selection for various structural and mechanical needs.