Description
Factory-direct ASTM A500 GR.B SHS — Vertically integrated steel mill and fabrication workshop under one roof, eliminating third-party sourcing gaps for hollow structural sections.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | ASTM A500 GR.B Square Hollow Structural Section Tube |
| Product Type | Square Hollow Section (SHS) |
| Steel Grade | ASTM A500 Grade B |
| Standard | ASTM A500 |
| Section Shape | Square |
| Size Range | 19×19 mm – 800×800 mm |
| Technique | ERW (Electric Resistance Welded) |
| Surface Treatment | Black / Galvanized / Painted per project requirement |
| Tolerance | Per ASTM A500 dimensional tolerances |
| Ends | Plain ends, beveled ends available |
| Application | Structural frames, building columns, industrial platforms |
| MOQ | Negotiable per project volume |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Commercial Construction | Building column grids, roof trusses, mezzanine floor beams |
| Industrial Facilities | Warehouse portal frames, conveyor support structures, equipment platforms |
| Infrastructure | Bridge handrail posts, signage gantry columns, transit shelter frames |
| Energy & Utilities | Solar panel mounting structures, substation support frames |
| EPC Projects | Modular plant pipe racks, skid base frames, access stairway stringers |
What Negative Wall Tolerance Really Means for Your Structural Budget
A 10% wall-thickness shortfall on a 400×400 SHS column can cut load capacity by more than you expect.
When procurement teams compare quotes on ASTM A500 GR.B square hollow structural section tube, the cheapest price per ton often hides aggressive negative tolerance rolling. The tube arrives on site looking right — same outer dimensions, same weight per bundle — but the wall is thinner than spec. Weld connections designed for full-thickness fusion get compromised. Third-party inspectors flag dimensional non-conformance. And the replacement cost lands weeks after the crane is already scheduled. [NEED_CITE: ASTM A500 tolerance requirements for cold-formed welded hollow sections]
Matching ASTM A500 GR.B SHS to Structural Frame Demands
ASTM A500 Grade B specifies a minimum yield strength tier that aligns with standard structural engineering assumptions for building frames and industrial platforms. The ERW welding process produces a consistent longitudinal weld seam suited to the compressive and bending loads typical in column and beam applications. When engineers specify 19×19 through 800×800 mm square profiles, the flat faces of the ASTM A500 GR.B square hollow structural section tube provide direct bearing surfaces for moment connections and base plate welding — no gusset adaptation needed. Our own steel mill produces the raw coil, and our fabrication division cuts, drills, and welds these sections into assembled components, so dimensional continuity holds from material to finished piece.
Engineering Compliance and Certification Pathways
Structural frames designed under AISC 360 require material traceability back to the heat number, and ASTM A500 GR.B conforms to the mechanical and chemical requirements that AISC references for welded hollow sections. For projects shipping to the European market, equivalence mapping between ASTM A500 and EN 10219 grades must be documented — and customs authorities increasingly request CE marking paperwork at the port of entry. [NEED_CITE: steel grade equivalence mapping between ASTM A500 and EN 10219] Surface treatment selection — black, hot-dip galvanized, or painted — depends on the corrosion environment the frame will face: indoor warehouse structures may only need shop primer, while coastal infrastructure demands galvanized coating thickness verified per ISO 1461. Cut-to-length service at the fabrication stage reduces on-site welding and secondary processing for contractors working to tight erection schedules.
Understanding ERW Welding and Grade B Performance
ASTM A500 Grade B sits in the mid-range yield tier of the A500 family, offering higher strength than Grade A while remaining formable enough for the cold-forming and ERW welding process that shapes flat coil into square profiles. The ERW process fuses the longitudinal seam through resistive heating without filler metal — producing a weld zone that, when properly normalized, matches the base metal in structural continuity. This makes ASTM A500 GR.B square hollow structural section tube suitable for load-bearing frames where the weld seam must transfer stress without becoming a fatigue initiation point. The square profile’s sharp-corner geometry — achievable through our proprietary forming technology — maximizes the flat bearing surface for bolted end-plate connections and improves aesthetic lines in exposed architectural applications. Wall thickness consistency across the flat faces and corner radii directly affects section modulus calculations, and that is where mill-level process control separates reliable supply from risky sourcing.
The Hidden Cost of Unverified Hollow Sections
Material certificates that list the correct grade on paper but do not match the physical product create compounding failures: structural engineers sign off on load calculations that the actual tube cannot support, inspectors reject batches after erection has begun, and replacement shipments delay project handover by months. [NEED_CITE: consequences of material non-conformance in structural steel projects] ASTM A500 GR.B square hollow structural section tube sourced without verified mill test documentation risks customs holds at destination ports — particularly on projects requiring CE or third-party inspection certificates. The true cost of a rejected container is never just the material price; it is the idle crane, the rescheduled crew, and the contractual penalty.
Why Procurement Teams Source This Grade From XJY Structure
Our vertical integration means the same facility that rolls the steel coil also forms, welds, and inspects the finished ASTM A500 GR.B square hollow structural section tube — there is no handoff between a material supplier and a separate fabricator where traceability gaps appear. We maintain over 2,800 specifications in stock across our own mill and warehouse, so standard size ranges from 19×19 mm to 800×800 mm ship without waiting for third-party procurement. Every heat carries a mill test certificate generated from our in-house laboratory, documenting chemical composition and mechanical test results against ASTM A500 requirements. Our fabrication division holds certified welding procedures and qualified welders per AWS and EN standards, and we produce complete quality documentation packages — WPS, PQR, weld maps, and dimensional inspection reports — for every shipped order. Professional loading teams handle oversized SHS bundles with proper lashing and edge protection, preventing the corner dents and wall buckling that plague poorly packed containers on long sea transits.
Documentation & Compliance
- Mill test certificate documenting ASTM A500 GR.B chemical composition and mechanical test results per heat number
- CE certificate per EN 10219 for projects requiring European conformity marking on hollow structural sections
- ISO 9001 quality management certificate covering the integrated mill and fabrication process
- SGS or BV third-party inspection report available for pre-shipment verification of dimensions, coating thickness, and weld quality
- Full material traceability from coil heat number through finished ASTM A500 GR.B square hollow structural section tube
- Export documentation package including packing list, bill of lading, and certificate of origin for customs clearance
Packaging, Loading & Delivery
- ASTM A500 GR.B SHS bundles secured with steel straps and edge protectors to preserve square corner geometry during ocean transit
- Black surface tubes coated with anti-rust oil; galvanized units wrapped with waterproof film to prevent white rust formation
- Container loading optimized by size range — smaller 19×19 to 200×200 mm sections nested for 40ft HC utilization; oversized 800×800 mm profiles shipped on flat rack or breakbulk
- Cut-to-length service available per project drawing, reducing on-site cutting waste for erection crews
- Heat number and steel grade stenciled on each bundle tag for site-side identification and traceability verification
- FOB, CIF, and DDP terms supported with door-to-door logistics coordination for EPC project sites
Getting Your ASTM A500 GR.B SHS Quote Moving
Submit your project drawings or specification list — including section sizes, wall thickness, total tonnage, steel grade, and destination port — and our team responds within 24 hours with a detailed quotation covering material, fabrication, coating, packing, and shipping. For non-standard sizes or custom fabrication requiring shop drawing review, we provide engineering support before production begins. Confirm your certification requirements and inspection preferences upfront so the mill test certificate and compliance documents travel with your shipment.
Frequently Asked Questions
Q: What size range is available for ASTM A500 GR.B square hollow sections?
A: We produce ASTM A500 GR.B square hollow structural section tube from 19×19 mm up to 800×800 mm, with wall thickness and length customized per project requirements.
Q: Can you provide mill test certificates for each shipment?
A: Yes, every bundle of ASTM A500 GR.B square hollow structural section tube ships with a mill test certificate documenting chemical composition and mechanical properties, traceable to the original heat number.
Q: Do you handle custom fabrication beyond supplying raw tubes?
A: Our fabrication division provides CNC cutting, drilling, welding, shot blasting, and painting services — we can deliver finished assembled components per your engineering drawings, not just raw sections.
Q: What surface treatment options are available?
A: ASTM A500 GR.B SHS can be supplied black with anti-rust oil, hot-dip galvanized per ISO 1461, or painted to project-specified coating systems depending on the corrosion environment.
Q: How do you ensure dimensional accuracy on large square sections?
A: Our proprietary forming technology controls corner geometry and flat-face tolerances across the full 19×19 to 800×800 mm range, with in-process dimensional checks documented in the quality inspection report.
Get Your ASTM A500 GR.B SHS Quotation Started
Send your project specifications — section sizes, quantities, standards, and destination — to receive a detailed quote with mill test certificate and production schedule.
Contact us:
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@xjystructure.com
Website: www.xjystructure.com
