Description
Factory-Direct ASTM A500 GR.B Supply — Every ASTM A500 GR.B square hollow structural section tube rolls from our own ERW lines with original mill test certificates and no broker markup.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | ASTM A500 GR.B Square Hollow Structural Section Tube |
| Product Type | Square Steel Tube (Welded / ERW) |
| Steel Grade | Gr.B, S235, S275, S355, STK400 |
| Standard | ASTM A500, ASTM A53, GB/T 3091 |
| Section Shape | Square |
| Size Range | 19mm×19mm – 800mm×800mm |
| Wall Thickness | 1 – 30 mm |
| Length | 5.8m / 6m / 11.8m / 12m / Random Length |
| Technique | ERW (Welded) / Seamless available |
| Surface Treatment | Black Painting / Galvanized / Varnish / Bare |
| Tolerance | ±1% |
| Ends | Plain |
| Application | Construction structures / Building frames / Curtain walls / Support tubes / Structural pipe / Machinery frames |
| MOQ | 5 Tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Construction & Infrastructure | Building frames, column supports, portal frame structures, bridge handrails |
| Industrial Machinery | Machinery frames, conveyor support structures, equipment bases |
| Architectural Facades | Curtain wall mullions, decorative structural grids, canopy frameworks |
| Urban Development | Scaffolding uprights, street furniture frames, solar mounting structures |
What Negative Tolerance Does to a Structural Frame Budget
Theoretical weight on paper rarely matches what arrives on site when wall thickness drifts beyond ±1%.
Project procurement teams ordering ASTM A500 GR.B square hollow structural section tube for load-bearing columns frequently discover that per-meter cost savings from aggressive negative tolerance evaporate once third-party inspection flags wall thickness below the minimum specified in ASTM A500. The rework cost — replacing rejected sections, delaying crane schedules, re-submitting documentation to the project engineer — typically dwarfs the original price difference. [NEED_CITE: ASTM A500 tolerance requirements for cold-formed structural tubing]
Matching Section Dimensions to Load-Bearing Frames
Square hollow sections from 19mm×19mm through 800mm×800mm cover everything from light-gauge curtain wall mullions to heavy column uprights in portal frame warehouses. The ASTM A500 GR.B square hollow structural section tube in S355 grade provides the yield strength needed for multi-story building frames where wind load and seismic requirements push designers toward higher-grade material. Wall thickness selection between 1mm and 30mm lets engineers balance dead weight against moment of inertia — thinner walls for non-load-bearing architectural elements, thicker sections for primary structural members carrying crane loads or mezzanine floors.
Structural Compliance and Surface Protection Requirements
Load-bearing frames designed to EN 1993 or AISC specifications require traceable mill certificates linking each bundle to its heat number and chemical composition. [NEED_CITE: EN 10219 cold-formed hollow section dimensional and technical requirements] For outdoor or humid environments, hot-dip galvanized ASTM A500 GR.B square hollow structural section tube resists corrosion without field-applied coatings that add labor cost and cure-time delays. Black painted or varnished finishes suit indoor applications where appearance matters but corrosion risk remains low. Bare tubes ship to fabrication shops that prefer to handle surface treatment after cutting and welding, avoiding damage to pre-applied coatings during secondary processing.
Steel Grade Selection and ERW Weld Integrity
The ASTM A500 system (Gr.B) and EN system (S235, S275, S355) represent different regional specification frameworks, but both define minimum yield strength thresholds that increase progressively across the grade range. [NEED_CITE: steel grade equivalence mapping between ASTM A500 and EN 10219] ERW welded square tubes offer cost advantages over seamless alternatives at standard wall thicknesses while maintaining weld-line integrity verified through routine flattening and ultrasonic testing. Seamless options remain available for applications requiring uniform properties through the entire cross-section or where weld-line inspection is impractical post-installation. Surface treatment choice — galvanized for corrosion resistance, black painted for cost efficiency, bare for downstream fabrication flexibility — should align with the installation environment and the buyer’s own coating capabilities.
Hidden Costs When Certification or Tolerance Fails
An ASTM A500 GR.B square hollow structural section tube arriving without a readable heat number on the mill test certificate becomes scrap in the eyes of a strict project inspector — regardless of whether the physical material meets specification. [NEED_CITE: third-party inspection rejection criteria for structural steel imports] Wall thickness drifting beyond the ±1% tolerance declared in the purchase order triggers re-measurement of every piece, delays container unloading, and may force the buyer to source replacement material locally at premium prices. Missing CE marking on tubes destined for European markets halts customs clearance, incurring port storage charges that accumulate daily until documentation catches up with cargo.
Procurement Confidence from Mill to Site
Every ASTM A500 GR.B square hollow structural section tube we supply rolls through three production lines running simultaneously, giving us the capacity to fill urgent bulk orders without diverting stock from other customers. Our in-house laboratory issues original mill test certificates for every heat, and we coordinate SGS or BV third-party inspection at the mill before container sealing — so the certificate your project engineer reviews matches the physical material arriving at destination. With over 2,800 specifications in ready stock, we consolidate square tubes, round pipes, plates, and section steel into single container loads, reducing your per-ton freight cost and eliminating coordination across multiple suppliers. Custom non-standard sizes and定尺 lengths ship within typical production lead times, and our export team handles packing list, bill of lading, and certificate of origin documentation to clear customs without delay.
Documentation & Compliance
- Mill test certificate documenting ASTM A500 Gr.B chemical composition (C, Mn, P, S, Si) and mechanical properties per heat number
- CE certificate confirming EN 10219 compliance for cold-formed structural hollow sections destined for European markets
- ISO 9001:2015 quality management certificate covering production process control and inspection procedures
- SGS or BV third-party inspection report verifying dimensional tolerance, surface quality, and weld integrity before shipment
- Material traceability linking each bundle to its heat number, steel grade (Gr.B / S235 / S275 / S355 / STK400), and production date
- Full customs document package including packing list, bill of lading, certificate of origin, and commercial invoice
Packaging, Loading & Delivery
- ASTM A500 GR.B square hollow structural section tube bundled with steel strips and edge protectors to prevent corner damage during ocean transit
- Galvanized square tubes wrapped with waterproof paper and plastic film to preserve zinc coating integrity in humid shipping conditions
- Container loading plans optimized for 6m and 12m lengths to maximize payload per 20ft or 40ft container, reducing per-ton freight cost
- Custom cut-to-length service available for 5.8m, 11.8m, or random lengths to match your fabrication line requirements and minimize on-site waste
- Heat number and steel grade stenciled on each bundle for rapid identification during unloading and inventory verification at destination
- FOB, CIF, and DDP shipping terms available with professional export team coordinating port clearance and door-to-door logistics
Start Your ASTM A500 GR.B Procurement
Submit your specification sheet — section dimensions, wall thickness, steel grade, quantity, and destination port — and receive a factory-direct quotation with mill test certificate confirmation within 12 hours. We will confirm available stock for standard sizes or provide a production timeline for custom orders, along with container loading optimization and documentation requirements for your destination market.
Request Factory-Direct Pricing with Mill Test Certificates
Send your ASTM A500 GR.B square hollow structural section tube inquiry to admin@sdxinjiyuan.com or contact via WhatsApp at +86 188 5315 7756 with your specifications, quantity, and destination port.
