Description
ASTM A500 GR.B square steel tube supplier — 19×19mm to 800×800mm SHS produced in-house with full mill test traceability.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | ASTM A500 GR.B Square Steel Tube |
| Product Type | Square Steel Tube (SHS) |
| Steel Grade | GR.B, S235, S275, S355, STK400 |
| Standard | ASTM A500, ASTM A53, GB/T3091 |
| Section Shape | Square |
| Size Range | 19mm×19mm – 800mm×800mm |
| Wall Thickness | 1 – 30 mm |
| Length | 5.8m / 6m / 11.8m / 12m / Random Length |
| Technique | Welded (ERW) / Seamless |
| Surface Treatment | Black Painting / Galvanized / Varnish / Bare |
| Tolerance | ±1% |
| Ends | Plain |
| Application | Steel structures / Construction frames / Building structures / Curtain walls / Support tubes / Fertilizer tubes |
| MOQ | 5 Tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| EPC Contractors | Industrial plant frames, pipe rack supports, equipment platforms |
| Construction Companies | High-rise building columns, bridge handrails, curtain wall mullions |
| Machinery Manufacturers | Conveyor system frames, crane booms, hydraulic support structures |
| Infrastructure Developers | Sound barrier posts, solar panel mounting structures, signage gantries |
Where Tolerance Drives Structural Fit-Up on Square Hollow Sections
±1% dimensional tolerance on ASTM A500 GR.B square steel tube determines whether beam-to-column connections bolt up on site or require costly rework.
When procurement teams source SHS from multiple mills without verified tolerance control, the cumulative deviation on side length and wall thickness creates misaligned bolt holes and uneven weld gaps. I have seen entire container loads rejected at destination because 200×200mm sections measured 204mm on two sides — the fabricator could not close the connection plates without grinding. For ASTM A500 GR.B square steel tube orders destined for EU and North American projects, third-party dimensional verification before shipment prevents these field-fit failures. [NEED_CITE: EN 10219 cold-formed hollow section dimensional tolerance requirements]
Matching SHS Profiles to Structural Load Paths
ASTM A500 GR.B square steel tube in the 200×200mm to 400×400mm range with wall thickness above 10mm serves as primary compression members in portal frames and bracing systems. The square geometry provides equal radius of gyration on both axes, making it efficient for bi-axial bending scenarios common in moment-resisting frames. For corrosion-exposed applications such as coastal infrastructure or chemical plant supports, galvanized surface treatment extends service life without ongoing maintenance. Our ERW and seamless production lines cover both thin-wall architectural sections and thick-wall structural members within a single procurement package.
Engineering Compliance and Certification Requirements
Structural hollow sections for load-bearing applications must conform to recognized standards — ASTM A500 for North American projects, EN 10210/EN 10219 for EU construction, and JIS G3466 for Japanese-specification works. [NEED_CITE: steel grade equivalence between ASTM A500 GR.B and EN S355] CE certification under EN 10210/EN 10219 is mandatory for customs clearance into EU member states; missing documentation triggers port holds averaging weeks. Wall thickness verification against nominal values ensures compliance with design assumptions — negative tolerance beyond code limits reduces load capacity and voids engineer sign-off. Mill test certificates must document heat number traceability from slab to finished tube.
Steel Grade Selection and Production Process
ASTM A500 GR.B represents the baseline structural grade in the ASTM system, with equivalent yield performance to EN S235 and GB Q235B. When projects demand higher load capacity, S275 or S355 grades provide increased yield strength without changing section geometry. The ERW welded process suits standard structural applications with cost efficiency, while seamless ASTM A500 GR.B square steel tube serves high-pressure or critical load paths where weld integrity is a concern. Surface treatment selection depends on exposure conditions: black painting for indoor structural frames, hot-dip galvanized for outdoor or humid environments, and bare finish for sections requiring field welding or custom coating. Wall thickness from 1mm to 30mm covers architectural cladding supports through heavy industrial columns.
Hidden Costs of Non-Conforming Material
Purchasing ASTM A500 GR.B square steel tube without verified mill test certificates risks material substitution — lower-grade steel stamped with GR.B markings passes visual inspection but fails mechanical testing. Customs authorities in EU and GCC countries reject shipments lacking CE marking or proper EN certification, incurring demurrage and return freight costs. Wall thickness below specified tolerance reduces section modulus, forcing structural engineers to redesign connections or reject installed members. These failures surface during load testing or inspector audits, long after the procurement decision — the true cost includes project delays, reputational damage, and contractual penalties. [NEED_CITE: consequences of non-compliant structural steel in international construction projects]
Procurement Confidence Through Verified Production
Every ASTM A500 GR.B square steel tube produced in our mill undergoes chemical composition analysis and mechanical testing in our in-house physical and chemical laboratory before release. Original mill test certificates document heat number, yield strength, tensile strength, and elongation for each batch — available for client review before shipment. Third-party inspection by SGS or BV confirms dimensional accuracy and surface quality against ASTM A500 requirements. Our 41 patented technologies include sharp-corner rectangular tube production, filling gaps in global market supply for architectural applications. With 2,800+ specifications across square, rectangular, and round sections, we consolidate multi-item orders into single shipments — reducing coordination overhead for EPC contractors sourcing structural tubes, plates, and sections simultaneously. Professional loading plans optimize container utilization for 6m and 12m lengths, with door-to-door logistics covering FOB, CIF, and DDP terms to 50+ countries.
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/EN 10219 for EU market customs clearance
- ISO 9001:2015 quality management system certificate covering production and inspection processes
- SGS or BV third-party inspection report verifying dimensional tolerance and surface treatment quality
- Material traceability sheet linking finished ASTM A500 GR.B square steel tube to original slab heat number
- Customs documentation package including packing list, Bill of Lading, and Certificate of Origin
Packaging, Loading & Delivery
- ASTM A500 GR.B square steel tubes bundled with steel strips and edge protectors to prevent corner damage during ocean transit
- Galvanized SHS sections wrapped with waterproof paper and plastic film to preserve zinc coating integrity
- Container loading plans optimized for 6m and 12m lengths, maximizing payload for 20ft and 40ft shipments
- Custom cutting to project-specified lengths available, reducing on-site waste and handling
- Heat number and steel grade stenciled on each bundle for site identification and traceability
- FOB, CIF, and DDP shipping terms with real-time tracking and port coordination services
Requesting Quotation and Technical Documentation
Submit your ASTM A500 GR.B square steel tube requirements including outer dimension, wall thickness, length, quantity, surface treatment, and destination port. We respond within 12 hours with unit pricing, production lead time, and applicable certification documentation. Non-standard sizes and custom cutting specifications receive technical review within 24 hours. Confirm mill test certificate format and third-party inspection requirements before contract execution.
Frequently Asked Questions
Q: What is the steel grade equivalence between ASTM A500 GR.B and EN standards?
A: ASTM A500 GR.B corresponds approximately to EN S235 in yield strength. For higher strength requirements, S275 and S355 grades are available to meet EN 10219 specifications.
Q: Can you provide third-party inspection before shipment?
A: Yes, SGS and BV inspection services are available for dimensional verification, surface treatment quality, and witness testing. Inspection reports are provided before container loading.
Q: What is the minimum order quantity for ASTM A500 GR.B square steel tube?
A: The MOQ is 5 tons per size. Mixed orders across multiple dimensions are accepted to reach container-load quantities.
Q: Do you offer custom non-standard sizes outside the catalog range?
A: Yes, non-standard dimensions and wall thicknesses are available subject to technical review. Custom sizes may require extended production lead times.
Q: What certifications are provided for EU customs clearance?
A: CE certification under EN 10210/EN 10219, mill test certificates, and Certificate of Origin are included in the standard documentation package for EU destinations.
Secure Factory-Direct Pricing for ASTM A500 GR.B Square Steel Tube
Email your specifications to admin@sdxjysteel.com or contact via WhatsApp at +86 188 5315 7756 to receive quotation with mill test certificate within 12 hours.
