Description
Factory-Direct Rectangular Hollow Sections — 3 production lines running simultaneously with monthly capacity exceeding 20,000 tons, eliminating middleman markups on every ASTM A500 GR.B rectangular steel tube order.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | ASTM A500 GR.B Rectangular Steel Tube |
| Product Type | Rectangular Steel Tube / RHS Hollow Section |
| Steel Grade | GR.B, A53(A.B), S235, S275, S355, STK400 |
| Standard | ASTM A500, ASTM A53, GB/T 3091 |
| Section Shape | Rectangular |
| Size Range | 15mm×20mm – 700mm×800mm |
| Wall Thickness | 1 – 30 mm |
| Length | 5.8m / 6m / 11.8m / 12m / Random Length |
| Technique | Welded / Seamless |
| Surface Treatment | Black Painting / Galvanized / Varnish / Bare |
| Tolerance | ±1% |
| Ends | Plain |
| Application | Steel structures / Construction frames / Curtain wall / Support tubes / Building structures |
| MOQ | 5 Tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Building & Construction | Structural frames for warehouses, portal frames, mezzanine floors, column supports |
| Curtain Wall Systems | Vertical and horizontal mullions, perimeter support tubes for glazed facades |
| Infrastructure Projects | Bridge handrail posts, sound barrier frames, signage gantry structures |
| Industrial Facilities | Conveyor support structures, equipment platforms, machinery base frames |
| Steel Fabrication Shops | Welded assemblies, truss chords, bracing members for modular construction |
What Negative Tolerance Shortcuts Cost on Small-Profile Rectangular Tubes
Every gram matters when wall thickness drops below 3mm on sections under 50mm.
I watched a 30×50 RHS job get rejected at the port because the actual weight came in nearly 12% below theoretical — the inspector flagged the entire container. Small rectangular profiles like 15×20mm and 25×50mm are where tolerance shortcuts hurt the most, because thin-wall sections have minimal material margin. When buyers source an ASTM A500 GR.B rectangular steel tube without verifying tolerance claims, they risk structural underperformance, failed inspections, and expensive air-freight replacements. [NEED_CITE: EN 10219 cold-formed hollow section dimensional tolerance requirements]
How Size Range Matches Structural Frame Requirements
The 15×20mm to 700×800mm range covers everything from lightweight curtain wall mullions to heavy portal frame columns. For an ASTM A500 GR.B rectangular steel tube in building frames, the 100×200mm to 300×400mm sections handle typical beam-column applications, while smaller profiles serve as purlins and bracing. Wall thickness from 1mm to 30mm allows engineers to optimize weight-to-strength ratios without switching suppliers mid-project. Our 2,800+ ready-stock specifications mean contractors can consolidate structural tubes, support members, and fabrication stock into single shipments.
Engineering Compliance and Certification Pathways
Rectangular hollow sections for load-bearing structures must meet dimensional and material requirements under EN 1993-1-1 or AISC 360 depending on the project region. For European markets, CE certification to EN 10210 (hot-finished) or EN 10219 (cold-formed) is mandatory for structural steelwork — customs authorities routinely hold shipments lacking valid Factory Production Control certificates. [NEED_CITE: CE marking requirements for structural hollow sections under EN 10210 and EN 10219] The ASTM A500 GR.B rectangular steel tube we supply carries CE (EN 10210/10219) and FPC certification, with original mill test certificates documenting chemical composition and mechanical properties per heat number. For projects requiring third-party verification, SGS or BV inspection is available before loading.
Steel Grade Selection and Manufacturing Process
GR.B under ASTM A500 specifies minimum yield strength of 42 ksi (290 MPa) for rectangular sections, positioning it between S235 and S275 in European grade equivalence. When projects call for higher load capacity, S355 offers increased yield strength without section enlargement. The welded (ERW) process suits standard structural applications with consistent wall thickness, while seamless options serve higher-pressure or critical-load scenarios. Surface treatment selection depends on exposure conditions: black painted for indoor structural frames, hot-dip galvanized for outdoor or corrosive environments, bare for projects requiring field welding or custom coating. [NEED_CITE: steel grade equivalence between ASTM A500 and EN 10219 standards]
Hidden Costs of Unverified Material Procurement
Material substitution or tolerance deviation creates costs that surface only during installation or inspection. Steel that fails to meet ASTM A500 GR.B chemical composition triggers rejection at third-party inspection, delaying project timelines and triggering contractual penalties. Missing mill test certificates cause customs holds at destination ports — shipments sit in bonded warehouses for weeks while importers scramble for documentation. [NEED_CITE: structural steel material certification requirements for customs clearance] Negative tolerance beyond acceptable limits reduces actual load-bearing capacity, creating safety concerns that only emerge under structural loading or during forensic engineering review.
Why Bulk Buyers Choose Our Supply Chain
Factory-direct pricing with no trading company margin means volume discounts apply from the first container. Three production lines running simultaneously deliver monthly capacity exceeding 20,000 tons across rectangular, square, and round sections. Every batch ships with original mill test certificates — not copies or declarations — documenting heat number, chemical composition, and mechanical test results. For European projects, our CE certification to EN 10210/10219 with valid FPC documentation clears customs without delay. Flexible MOQ from 5 tons supports trial orders while long-term partners access consolidated multi-product container loading and dedicated account management.
Documentation & Compliance
- Mill test certificate documenting GR.B chemical composition and mechanical properties per ASTM A500, with heat number traceability
- CE certificate confirming compliance with EN 10210 (hot-finished) or EN 10219 (cold-formed) for structural hollow sections
- ISO 9001:2015 quality management system certificate covering production and inspection processes
- SGS or BV third-party inspection report available upon request for pre-shipment verification
- Material traceability documentation linking each bundle to specific heat numbers and production dates
- Complete customs document package including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- Black painted ASTM A500 GR.B rectangular steel tubes bundled with steel strips and edge protectors to prevent coating damage during handling
- Galvanized sections packed with waterproof wrapping and separation layers to preserve zinc coating integrity during ocean transit
- Container loading optimization for 6m and 12m lengths maximizes payload while maintaining weight distribution for 20ft and 40ft containers
- Heat number and steel grade stenciled on each bundle for site identification and traceability verification
- FOB, CIF, and DDP shipping terms available with professional export documentation handling
- Random length or cut-to-order options available for 5.8m, 6m, 11.8m, and 12m requirements
Initiating Your Procurement Inquiry
Submit your specifications including section size, wall thickness, steel grade, quantity, and destination port to receive a detailed quotation with volume pricing and delivery timeline. For non-standard dimensions or custom lengths outside the 15×20mm to 700×800mm range, our engineering team provides feasibility assessment and production scheduling. We confirm certification requirements and prepare complete documentation packages before contract execution.
Frequently Asked Questions
Q: What is the difference between ASTM A500 GR.B and S355 steel grades?
A: ASTM A500 GR.B specifies minimum yield strength of 290 MPa for rectangular sections, while S355 offers 355 MPa minimum yield. Both serve structural applications, with S355 providing higher load capacity for the same section size. We supply both grades with full mill test certification.
Q: Can you provide CE certification for European market compliance?
A: Yes, our rectangular hollow sections carry CE certification to EN 10210 (hot-finished) and EN 10219 (cold-formed) with valid Factory Production Control documentation. This certification is required for structural steelwork entering European Union markets and clears customs without delay.
Q: What is the minimum order quantity for ASTM A500 GR.B rectangular steel tubes?
A: The standard MOQ is 5 tons, which supports trial orders and small project requirements. For long-term partners, we offer flexible scheduling with split shipments from ready stock covering 2,800+ specifications.
Q: Do you provide third-party inspection before shipment?
A: Yes, SGS and BV third-party inspection services are available upon request. We coordinate inspection scheduling and provide complete documentation including inspection reports, photographs, and test results for your records.
Q: How do you handle container loading for mixed-size orders?
A: Our export team optimizes container loading plans based on your specific size mix and length requirements. We consolidate multiple specifications into single containers to maximize payload efficiency while ensuring secure packing and weight distribution for ocean transit.
Request Your ASTM A500 GR.B Rectangular Steel Tube Quotation
Send your specifications to receive factory-direct pricing with mill test certificates and complete export documentation.
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