Our Rectangular Steel Tube for Structural Fabrication offers welded and seamless types, with precise right-angle forming, uniform wall thickness, excellent straightness and high section accuracy. Hollow profiles have excellent bending and torsion resistance, as well as structural stability and weldability.
As lightweight and high-strength structural profiles, they are widely used in building steel structures, municipal infrastructure, traffic guardrails, photovoltaic supports, industrial equipment frames, logistics storage shelves and high-end curtain wall decorations, etc.
The closed rectangular section gives high structural rigidity and even stress distribution, with no stress concentration points. Compared with round pipe and channel steel, it delivers better bending, torsion and compression resistance. Under equivalent load, it reduces structural self-weight and material consumption, which suits large-span, high-load and high-seismic industrial and civil projects.
We produce by precision cold-forming and hot rolling. The pipe has accurate right angles, high flatness and tight dimensional tolerance, with burr-free end faces. Standardized section sizes give tight fitting and narrow assembly gaps in modular steel structure construction. This reduces on-site correction and rework.
Uniform material properties support welding, cutting, bending, punching, threading and flange connection without deformation or cracking. Non-standard processing is done to engineering drawings. The same material covers heavy-load structural members and light decorative or equipment frame applications.
High-purity steel billet with low impurity content gives the pipe basic resistance to rust and oxidation in outdoor exposure, humidity, low temperature and sandstorm conditions. Surface treatment is selected by environment: hot-dip galvanizing, cold galvanizing or epoxy anti-corrosion spraying. These resist acid, alkali and UV aging, extending service life and reducing maintenance frequency.
The surface is smooth with sharp edges and regular lines, and requires no complex secondary finishing. The pipe serves as both load-bearing structural material and exposed decorative material for building curtain walls, outdoor structures and equipment frames.
Each batch is inspected for dimensions, appearance, mechanical properties and non-destructive testing. Factory certificates, material reports and performance test reports ship with every order. SGS and BV third-party inspections are supported. Export documents comply with the import and engineering acceptance requirements of the destination market.
| Parameter Item | Specification Details |
| Execution Standards | GB/T 6728, GB/T 3094, EN 10219, EN 10210, ASTM A500, JIS G3466 |
| Material Grade | Q195, Q235B, Q345B, S235JR, S355JR, A500 GR.B |
| Product Type | Cold-Formed Welded Square & Rectangular Pipe, Hot-Rolled Seamless Hollow Section, Hot-Dip Galvanized Pipe, Painted Anti-Corrosion Pipe |
| Size Range | Side Length 20mm-400mm, Wall Thickness 1.2mm-16mm, Custom Fixed Length Available |
| Surface Treatment | Original Black Finish, Hot-Dip Galvanizing, Cold Galvanizing, Epoxy Anti-Corrosion Spraying, Rust-Proof Baking Paint |
| Processing Service | Fixed-Length Cutting, Groove Processing, Punching & Bending, Flange Welding, Precision Machining |
| Delivery Mode | In-Stock Direct Shipment, Bulk Customization, Full/LCL Container Export, Cross-Border Door-to-Door Delivery |
| Comparison Item | Welded Hollow Section | Seamless Hollow Section |
| Production Process | Cold-formed from steel strip, high-frequency welded seam | Hot-rolled from solid billet, no weld seam |
| Weld Seam | Has weld seam (strength integrated with base metal) | No weld seam, uniform structure |
| Compression & Torsion Resistance | Good, meets conventional structural requirements | Higher, superior for high-pressure and heavy-load applications |
| Dimensional Accuracy | Excellent, tighter wall thickness tolerance | Good |
| Surface Finish | Smooth, uniform, minimal dimensional deviation | Good, may require additional finishing |
| Cost | More cost-effective | Higher |
| Delivery Lead Time | Shorter, ample stock available | Longer, depending on specifications |
| Specification Range | Complete, covering most standard sizes | Limited for non-standard sizes |
| Best Suited For | Building frames, guardrails, supports, storage racks, decorative structures | Heavy machinery, high-pressure systems, large-span load-bearing, high-end precision engineering |
| Selection Tip | Choose welded for cost-sensitive, general structural applications | Choose seamless for high-pressure, heavy-load, and precision-critical scenarios |
Quick Selection Guide:
For conventional building structures, municipal guardrails, photovoltaic supports, storage racks → Welded hollow sections are sufficient and more cost-effective.
For heavy machinery bases, high-pressure systems, large-span load-bearing structures, and high-end precision equipment → Seamless hollow sections are recommended for superior structural integrity.
• Southeast Asia New Energy Photovoltaic Support Project (2025): We supplied 1,500 tons of S355JR hot-dip galvanized square and rectangular pipes for large-scale photovoltaic power station projects in Indonesia and Vietnam, applied to the overall support frame of photovoltaic arrays. Adopting thickened galvanized layer passivation technology, the products deliver excellent corrosion and aging resistance to adapt to local high temperature, high humidity and strong salt spray environments. Pre-cutting and pre-punching processing enabled direct on-site assembly, greatly shortening the construction cycle. The project passed one-time acceptance and established long-term annual supply cooperation.
• African Industrial Park Steel Structure Project (2025): Undertaking the expansion project of Nigeria Industrial Park, we supplied 920 tons of high-strength Q345B black finished square and rectangular pipes for main load-bearing beam and column structures of industrial factories. With uniform wall thickness and high bending resistance, the products fully meet the local construction standards for large-span factory load-bearing, wind resistance and seismic performance. Timely delivery and stable quality ensured smooth project acceptance and won high recognition from clients.
• European Municipal Traffic Guardrail Project (2024): We supplied 750 tons of EN standard S235JR precision galvanized rectangular pipes for the municipal road upgrading project in Poland, applied to urban road and bridge safety guardrail systems. Featuring precise right-angle forming, flawless surface and excellent impact resistance, the products fully comply with European high-end municipal engineering appearance and safety standards. Complete English qualification documents ensured efficient customs clearance and project acceptance.
A: Welded hollow sections feature complete specifications, high cost performance and fast delivery, suitable for general scenarios such as conventional building frames, guardrails, supports and decorative structures. Seamless hollow sections have higher compactness, compression and torsion resistance without weak welding seams, ideal for harsh working conditions including heavy machinery, high-pressure systems, large-span load-bearing and high-end precision engineering. We provide professional selection solutions according to project load, environment and construction standards.
A: Full-dimensional customization is supported. We provide custom non-standard side length, wall thickness and fixed length, as well as surface treatments including hot-dip galvanizing, thickened anti-corrosion coating and special baking paint. Deep processing services such as grooving, punching, bending, special-shaped cutting and flange welding fully meet personalized engineering construction requirements.
A: Rectangular Steel Tube for Structural Fabrication is manufactured on automatic precision forming production lines with full-process numerical control shaping. Right-angle deviation, straightness and wall thickness tolerance are strictly controlled to ensure flat surfaces, clear edges and no distortion. Each product is inspected for appearance, dimension and performance before delivery to eliminate warping, burrs, dents and deformation, ensuring assembly accuracy and appearance quality.
A: Sufficient stock is available for mainstream Chinese, European and American standard specifications. Sample and small-batch orders can be shipped within 3-7 working days. Production schedules for large-batch customized orders are arranged according to process complexity to match project progress. Full container and LCL cross-border export are supported with whole-process logistics tracking and delivery docking.
A: Our hot-dip galvanized pipes adopt high-temperature zinc dipping and passivation technology with uniform and high-adhesion zinc layers to isolate air and moisture, achieving 5-10 years of stable rust resistance in conventional outdoor environments. All products pass strict pre-delivery quality inspection with traceable quality. Formal after-sales warranty and maintenance services are provided for non-artificial process and material quality problems.
With years of in-depth experience in steel profile R&D, production and cross-border export, YS STEEL specializes in providing high-quality Rectangular Steel Tube for Structural Fabrication and integrated procurement solutions for global engineering contractors, traders and manufacturing enterprises.
Relying on standardized quality control system, mature customized deep processing capacity, stable in-stock inventory and efficient cross-border delivery system, we solve full-chain problems in product selection, processing, quality inspection, customs declaration and logistics for clients.
Adhering to strict quality standards, reliable delivery commitments and cost control, we support sample procurement, bulk procurement and long-term strategic cooperation. Global clients are sincerely welcomed for inquiry, factory inspection and win-win cooperation.
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Unit1, 128Building, Nanhuxiangjun, Lunan District, Tangshan City, Hebei Province, China
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