Description
Factory-Direct Rectangular Tubes — No Middlemen, Every Spec Verified Against Mill Certs
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | ASTM A500 Rectangular Steel Tube |
| Product Type | Rectangular Steel Tube (Welded / ERW) |
| Steel Grade | Gr.B, S235, S275, S355, STK400, Q235B, Q345B |
| Standard | ASTM A500, ASTM A53, GB/T 3091, EN 10219 |
| Section Shape | Rectangular |
| Size Range | 15mm×20mm – 700mm×800mm |
| Wall Thickness | 1 – 30 mm |
| Length | 5.8m / 6m / 11.8m / 12m / Random Length |
| Technique | ERW (Welded) |
| Surface Treatment | Black Painted / Galvanized / Varnish / Bare |
| Tolerance | ±1% |
| Ends | Plain |
| Application | Steel structures / Construction frames / Curtain walls / Support tubes / Building structures / Fertilizer equipment |
| MOQ | 10 Tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| EPC Contractors & Construction | Structural frames for high-rise buildings, curtain wall support systems, column and beam assemblies |
| Machinery Manufacturers | Conveyor frame structures, automation equipment bases, industrial platform supports |
| Steel Distributors | Regional stock for project supply, resale in standard and non-standard rectangular profiles |
| Infrastructure Developers | Bridge support tubes, sound barrier frames, solar panel mounting structures |
What Wall-Thickness Tolerance Costs on a Structural Frame Order
A ±1% tolerance backed by in-house lab testing is the difference between passing third-party inspection and tearing out welded sections.
On a high-rise project in Southeast Asia, I watched a container of rectangular hollow sections arrive with mill certs that looked flawless. The moment our inspector pulled random tubes off the truck, the wall thickness read 6.2mm against an 8mm spec. Half the container was already welded into the structural frame. Tearing it out cost three weeks and nearly the entire profit margin. Negative tolerance is the silent killer in ERW rectangular tube procurement — and it happens when suppliers skip real-time quality control at the mill [NEED_CITE: EN 10219 cold-formed hollow section dimensional tolerance requirements].
Matching Rectangular Profiles to Structural Load Paths
ERW welded rectangular steel tubes in the 15×20mm to 700×800mm range serve distinct load-bearing roles depending on section geometry. Smaller profiles like 50×30mm function as purlin supports and bracing members, while larger sections such as 400×200mm carry primary beam loads in portal frames. The ASTM A500 rectangular steel tube with wall thickness up to 30mm provides the section modulus needed for moment-resisting connections in seismic zones. Our proprietary sharp-corner technology ensures flat bearing surfaces at welded joints — critical for gusset plate fit-up and base plate alignment in steel structure assemblies.
Engineering Compliance Across Global Markets
Structural rectangular hollow sections must satisfy different certification frameworks depending on destination. EU projects require CE marking under EN 10210 or EN 10219, with full traceability by heat number [NEED_CITE: EN 10219 cold-formed welded structural hollow sections certification]. North American EPC contractors specify ASTM A500 Gr.B with mill test certificates showing chemical composition and mechanical properties. Southeast Asian infrastructure projects often accept GB/T 3091 or dual-certified material. Surface treatment selection — hot-dip galvanized for coastal corrosion environments, black painted for interior structural frames, or bare for field-coated applications — must align with project specifications before fabrication begins.
Steel Grade Selection and ERW Welding Process
The ASTM A500 rectangular steel tube covers Gr.B as the baseline structural grade, while EN 10219 equivalents S235, S275, and S355 offer incrementally higher yield strength for heavier load conditions. Q235B and Q345B serve the Chinese domestic standard system, with Q345B providing approximately 50% higher yield than Q235B for demanding structural applications. ERW welding produces a longitudinal seam with consistent weld integrity across the full length — suitable for structural compression members and moderate-pressure applications. The sharp-corner rectangular tube process, developed through 41 invention patents, achieves tight radius control at corner zones where standard ERW forming leaves excessive thinning or geometric deviation [NEED_CITE: steel grade equivalence between ASTM A500 and EN 10219 standards].
The Hidden Cost of Unverified Material Procurement
Ordering rectangular steel tubes without confirmed mill test certificates creates cascading project risks. Material that fails to meet ASTM A500 Gr.B chemical composition triggers rejection at third-party inspection, delaying shipment and forcing emergency resupply. Missing CE documentation under EN 10219 blocks customs clearance at EU ports — cargo sits in bonded warehouses while suppliers scramble for paperwork. Wall thickness below specified tolerance compromises structural load capacity, forcing engineering re-evaluation or complete section replacement after installation. These failures trace back to fragmented sourcing: buying tubes, plates, and beams from separate suppliers without unified quality verification [NEED_CITE: structural steel procurement compliance requirements for international projects].
Procurement Confidence Through Verified Capabilities
Every ASTM A500 rectangular steel tube ships with mill test certificates documenting chemical composition and mechanical properties per the specified standard. Our in-house physical and chemical laboratory conducts incoming material inspection, in-process weld quality checks, and final dimensional verification before shipment. The product range covers 2,800+ specifications in rectangular, square, and round profiles — allowing single-source procurement for mixed structural packages. Third-party inspection by SGS or BV is available for every order, providing independent verification for project owners and EPC contractors. CE certification under EN 10210 and EN 10219 ensures EU market compliance, while ISO 9001:2015 quality management governs the full production cycle. Professional loading optimization maximizes container payload for heavy rectangular sections, with FOB, CIF, and DDP options to 50+ countries.
Documentation & Compliance
- Mill test certificate documenting Gr.B, S235, S275, or S355 chemical composition and yield strength per ASTM A500 or EN 10219
- CE certificate under EN 10210 / EN 10219 for EU project compliance and customs clearance
- ISO 9001:2015 quality management certificate covering ERW welding and dimensional inspection
- SGS or BV third-party inspection report verifying wall thickness, surface quality, and dimensional accuracy
- Material traceability by heat number linking each bundle to original slab chemistry and rolling records
- Customs documentation package including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- ERW rectangular tubes bundled with steel strips and edge protectors to prevent coating damage during ocean transit
- Galvanized surfaces wrapped with waterproof paper and plastic film to preserve zinc layer integrity in humid climates
- Container loading plans optimized for 6m and 12m lengths, maximizing payload for 15×20mm through 700×800mm sections
- Heat number and steel grade marked on each tube end for site identification and traceability verification
- FOB, CIF, and DDP shipping terms available with real-time tracking to ports across EU, North America, Southeast Asia, and Middle East
Requesting Quotation and Technical Documentation
Submit your ASTM A500 rectangular steel tube requirements — including outer dimensions, wall thickness, steel grade, surface treatment, quantity, and destination port — to receive a detailed quotation with delivery timeline and applicable certifications. Non-standard sizes and custom lengths are available for project-specific structural packages. Mill test certificates and CE documentation are confirmed before production begins, ensuring customs compliance at destination.
Frequently Asked Questions
Q: How do ASTM A500 Gr.B and EN 10219 S235/S275/S355 compare for rectangular steel tubes?
A: ASTM A500 Gr.B serves as the standard structural grade in North American specifications, while EN 10219 S235, S275, and S355 provide incrementally higher yield strength for European projects. Both standards require mill test certificates documenting chemical composition and mechanical properties. Dual-certified material is available for projects accepting either standard framework.
Q: Can you produce non-standard rectangular tube sizes outside the 15×20mm to 700×800mm range?
A: Custom non-standard rectangular profiles are available beyond the standard catalog, subject to minimum order quantity and tooling confirmation. Our 2,800+ specification range includes many non-standard dimensions developed for specific structural applications. Submit your drawing or dimension sheet for feasibility review.
Q: What surface treatment is recommended for coastal or high-humidity environments?
A: Hot-dip galvanized rectangular steel tubes provide superior corrosion resistance for coastal construction, marine structures, and outdoor infrastructure. Black painted or varnished surfaces suit interior structural frames where corrosion exposure is limited. Bare tubes are supplied for projects requiring field-applied coating systems.
Q: What documentation is required for EU customs clearance?
A: EU projects require CE marking under EN 10210 or EN 10219, with mill test certificates per EN 10204 3.1 or 3.2. The documentation package includes CE certificate, mill test report, packing list, bill of lading, and certificate of origin. Third-party inspection by SGS or BV provides additional verification for project owners.
Q: How do you optimize container loading for heavy rectangular steel tubes?
A: Professional loading plans maximize container payload based on tube dimensions, wall thickness, and length. Nested rectangular profiles and strategic weight distribution ensure compliance with port weight limits. FOB, CIF, and DDP shipping options are available with real-time tracking to 50+ countries.
Get Your ASTM A500 Rectangular Steel Tube Quote with Mill Test Certificates
Send your specifications — dimensions, wall thickness, steel grade, quantity, and destination — to receive pricing and confirmed delivery timeline.
Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.sdxjysteel.com
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@sdxjysteel.com
Address: No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China
