Description
Factory-direct ASTM A500 structural tubing — 2,800+ specifications in stock with wall thicknesses up to 40 mm, shipped from our own production lines to 50+ countries without broker markups.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | ASTM A500 Carbon Steel Seamless Square/Rectangular Hollow Section |
| Product Type | Seamless Square and Rectangular Hollow Section |
| Steel Grade | Q195, Q235, Q345, S235JR, S275JR, S355JR, ASTM A500 |
| Standard | ASTM A500, AISI |
| Section Shape | Square / Rectangular |
| Size Range | 1×1 inches (25×25 mm) and custom sizes |
| Wall Thickness | 0.9 mm (1.4 mm available) |
| Length | 6 m / 6.4 m / 12 m |
| Technique | Hot Rolled / Seamless |
| Surface Treatment | Black (Hot Rolled, Non-oiled) |
| Tolerance | ±1% |
| Ends | Plain |
| Application | Structure Pipe, Fluid Pipe, Boiler Pipe, Hydraulic Pipe, Gas Pipe, Oil Pipe, Chemical Fertilizer Pipe, Drill Pipe, Construction frames, Steel structures, Machinery |
| MOQ | 5 tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Construction & Infrastructure | High-rise building frames, bridge support columns, industrial warehouse structures |
| Architectural Facades | Glass curtain wall framing, exposed structural columns, decorative building exteriors |
| Machinery Manufacturing | Equipment support bases, conveyor system frames, hydraulic cylinder housings |
| Energy & Petrochemical | Pipeline support racks, drilling platform structures, chemical plant frameworks |
When Dimensional Tolerance Becomes a Structural Liability
±1% wall thickness tolerance means the difference between passing SGS inspection and returning a full container.
I learned this the hard way early in my export career. A batch of 1×1 inch small square tubes labeled at 1.4 mm wall thickness failed SGS复检 when actual negative tolerance exceeded 0.3 mm. The entire container was rejected at destination, unpacked, and retested. Since then, every shipment leaving our facility carries a mill test certificate with actual measured dimensions from our in-house physical and chemical laboratory — not theoretical calculations. [NEED_CITE: dimensional tolerance requirements for ASTM A500 structural tubing]
When you’re sourcing ASTM A500 seamless square rectangular hollow section supplier for load-bearing frames or architectural facades, specification gaps and missing certifications create cascading delays. Rounded corners on standard rectangular tubes look unfinished in glass curtain wall applications. CE marks missing from documentation block EU customs clearance. Negative tolerance beyond acceptable limits triggers rejection during third-party inspection. These aren’t theoretical risks — they’re weekly occurrences in international steel procurement.
Matching Hollow Sections to Structural Load Requirements
Seamless square and rectangular hollow sections produced under ASTM A500 standards serve distinct engineering functions based on steel grade selection and dimensional precision. For high-rise construction frames, Q345 or S355JR grades provide the yield strength needed to support vertical loads while maintaining dimensional stability across 6-meter and 12-meter lengths. The ±1% tolerance ensures consistent load distribution at connection points, critical when welding hollow sections to gusset plates or bolted end connections. Our ASTM A500 seamless square rectangular hollow section supplier capability covers wall thicknesses from 0.9 mm up to 40 mm, allowing engineers to specify exact weight-to-strength ratios without compromising on availability.
Engineering Compliance and Certification Pathways
Structural hollow sections used in load-bearing applications must comply with regional engineering codes — EN 1993 for European projects, AISC standards for North American construction, and GB 50017 for Chinese domestic projects. ASTM A500 Grade B and Grade C tubes meet these requirements when accompanied by proper mill test certificates documenting chemical composition and mechanical properties per EN 10204 3.1. For EU market entry, Lloyd’s CE certification under EN 10210/EN 10219 is mandatory, not optional. [NEED_CITE: CE marking requirements for structural steel hollow sections in European Union] Custom non-standard sizes and lengths can be produced to match specific project requirements, eliminating on-site cutting waste and reducing installation time.
Steel Grade Selection and Manufacturing Process Impact
The ASTM A500 standard classifies carbon steel structural tubing into four grades — A, B, C, and D — based on yield strength and chemical composition requirements. Grade B offers moderate strength suitable for general structural applications, while Grade C provides higher yield strength for heavy-load scenarios. Our production covers Q195 through Q345 in the Chinese GB system, S235JR through S355JR in the European EN system, and equivalent ASTM A500 grades, allowing direct substitution without redesign. The hot-rolled seamless manufacturing process eliminates weld seams found in ERW tubes, providing uniform wall thickness and superior surface finish critical for architectural applications where tubes remain exposed. [NEED_CITE: manufacturing process differences between seamless and welded structural tubing]
Hidden Costs of Specification Non-Compliance
Procuring ASTM A500 seamless square rectangular hollow section supplier products without verified mill test certificates creates downstream liabilities. Material mismatches between ordered grades and delivered products trigger rejection during structural inspection, requiring complete replacement and project delays. Missing CE documentation halts customs clearance for EU-bound shipments, generating demurrage charges that exceed the original material cost. Negative tolerance beyond ±1% reduces actual load-bearing capacity below engineering calculations, creating safety hazards in structural applications. Third-party inspection by SGS or BV before shipment eliminates these risks by verifying dimensional accuracy, chemical composition, and mechanical properties against ASTM A500 requirements. [NEED_CITE: consequences of non-compliant structural steel in construction projects]
Why Procurement Teams Choose SD XJY Pipe
Our factory operates three production lines covering 2,800+ specifications with wall thicknesses up to 40 mm, eliminating the need to source from multiple suppliers for different tube sizes and steel grades. The in-house physical and chemical laboratory tests every heat number for dimensional accuracy, tensile strength, and chemical composition before release, with results documented in mill test certificates provided with each shipment. We hold 41 invention patents including China’s first sharp-corner rectangular tube technology, filling gaps in architectural applications where traditional rounded-corner tubes create aesthetic and structural limitations. Full international certifications — ISO 9001:2015, Lloyd’s CE under EN 10210/EN 10219, Singapore FPC, and SGS/BV verification — ensure smooth customs clearance across 50+ export destinations. Professional container loading with anti-damage measures prevents bending and surface damage during ocean transit, reducing rejection rates at destination ports.
Documentation & Compliance
- Mill test certificate documenting Q195-Q345 and S235JR-S355JR chemical composition and yield strength per ASTM A500 and EN 10219 equivalencies
- Lloyd’s CE certificate under EN 10210/EN 10219 for seamless square and rectangular hollow sections exported to European Union markets
- ISO 9001:2015 quality management system certificate covering production processes and dimensional tolerance verification
- SGS or BV third-party inspection report available upon request, documenting actual wall thickness measurements and mechanical test results
- Material traceability by heat number linking each tube to specific production batch and mill test certificate
- Customs documentation including packing list, bill of lading, and certificate of origin for import clearance in destination countries
Packaging, Loading & Delivery
- Black hot-rolled seamless tubes bundled with steel strips and edge protectors to prevent surface damage during ocean transit
- 6-meter and 12-meter lengths optimized for 20-foot and 40-foot container loading, maximizing payload while preventing bending
- Plain end tubes capped at both ends to prevent debris entry and moisture accumulation during storage and transport
- Heat number and steel grade markings stenciled on each tube for site identification and traceability verification
- FOB, CIF, and DDP shipping terms available with professional container loading supervision to ensure proper weight distribution
- Custom cutting services available to produce non-standard lengths matching specific project requirements, reducing on-site waste
Streamlining Your Procurement Process
Submit your specifications including product type, dimensions, steel grade, surface treatment, quantity, and destination port to receive a detailed quotation within 12 hours. Request mill test certificates and product samples for quality verification before placing orders. Confirm third-party inspection requirements and certification needs for your destination market to ensure smooth customs clearance. Our team will provide professional container loading plans and delivery schedules matching your project timeline.
Frequently Asked Questions
Q: What is the difference between ASTM A500 Grade B and Grade C?
A: Grade C provides higher yield strength than Grade B, making it suitable for heavy-load structural applications. Both grades meet ASTM A500 chemical composition requirements, but Grade C offers enhanced load-bearing capacity for demanding engineering projects.
Q: Can you produce sharp-corner rectangular tubes for architectural facades?
A: Yes, we hold 41 invention patents including China’s first sharp-corner rectangular tube technology. These tubes provide superior aesthetics and structural performance for glass curtain walls and architectural facades compared to traditional rounded-corner tubes.
Q: Do your products have CE certification for EU market entry?
A: Yes, we hold Lloyd’s CE certification under EN 10210 and EN 10219 standards for seamless square and rectangular hollow sections. This certification ensures smooth customs clearance for shipments to European Union countries.
Q: What is the minimum order quantity for custom non-standard sizes?
A: Our MOQ is 5 tons for standard specifications. Custom non-standard sizes and lengths can be produced with typical production lead times of 15-25 days depending on specifications and quantity.
Q: How do you ensure dimensional accuracy and wall thickness tolerance?
A: Every shipment is tested in our in-house physical and chemical laboratory for dimensional accuracy, wall thickness, and mechanical properties. Mill test certificates with actual measured values are provided with each shipment, ensuring ±1% tolerance compliance.
Get Your ASTM A500 Quotation with Mill Test Certificates
Submit your specifications to admin@sdxjypipe.com or contact us via WhatsApp at +86 188 5315 7756 to receive detailed pricing, delivery schedules, and quality documentation within 12 hours.
