Description
Factory-Direct ASTM A500 Hollow Sections — Produced in-house from raw steel to finished square and rectangular tubes across 3 production lines with 2,800+ specifications in stock.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | ASTM A500 Carbon Steel Square / Rectangular Hollow Section |
| Product Type | Square / Rectangular Steel Tube (Hollow Section) |
| Steel Grade | Q195 / Q235 / Q345 / S235JR / S275JR / S355JR / ASTM A500 |
| Standard | ASTM A500 / AISI / API / BSI |
| Section Shape | Square / Rectangular |
| Size Range | 1×1 inch (approx. 25×25mm) and customizable sizes |
| Wall Thickness | 0.9mm–1.4mm |
| Length | 6m / 6.4m / 12m (custom cut-to-length available) |
| Technique | Hot Rolled / ERW |
| Surface Treatment | Hot Rolled / Black (non-oiled) |
| Tolerance | ±1% |
| Ends | Plain / Cut |
| Application | Steel structures / Construction frames / Machinery / Scaffolding / Furniture / Fluid Pipe / Boiler Pipe / Hydraulic Pipe / Gas Pipe / Structure Pipe |
| MOQ | 5 Tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Commercial Construction | Building frames, column-beam assemblies, mezzanine platforms |
| Industrial Facilities | Machinery frames, conveyor support structures, equipment platforms |
| Infrastructure & EPC | Scaffolding systems, bridge support members, utility structures |
| Warehouse & Logistics | Portal frame structures, racking systems, loading bay frameworks |
What Wall-Thickness Tolerance Costs on a Structural Frame Order
A ±1% tolerance on an ASTM A500 carbon steel square rectangular hollow section means the difference between passing dimensional inspection on site and shipping the entire container back.
When overseas buyers outsource fabrication to China, wall thickness deviation is the first thing third-party inspectors check. A batch of square tubes with negative tolerance drifting beyond acceptable limits will fail theoretical weight calculations — and if the gap between ordered weight and actual weight exceeds project thresholds, the entire shipment gets rejected at the port of destination. [NEED_CITE: ASTM A500 dimensional tolerance requirements for structural hollow sections] The cost is not just the rejected steel. It is the crane idle time, the re-sequenced erection schedule, and the contractual penalties that follow.
Matching Hollow Section Profiles to Structural Frame Requirements
An ASTM A500 carbon steel square rectangular hollow section in Q235 or S355JR grade serves as primary load-bearing members in portal frame structures and mezzanine platforms. The closed cross-section geometry provides torsional rigidity that open profiles cannot match, making these hollow sections suitable for column applications where bi-axial bending is expected. Our CNC cutting and drilling services allow direct preparation for bolted or welded connections, reducing on-site secondary work. For scaffolding and temporary structures, the 0.9mm–1.4mm thin-wall range delivers weight savings without sacrificing the dimensional accuracy that coupling connections demand.
Engineering Compliance and Certification Pathways
Structural hollow sections destined for EU markets must comply with EN 10219 for cold-formed welded structural hollow sections or EN 10210 for hot-finished equivalents — and the mill test certificate must reference the correct standard for customs clearance to proceed without delays. [NEED_CITE: EN 10219 cold-formed hollow section compliance requirements] For North American projects, ASTM A500 Grade B or C specification aligns with AISC design provisions. The choice between hot rolled and ERW technique affects surface finish and weld seam visibility, which matters when the hollow section remains exposed in architectural applications. Our engineering team reviews shop drawings against fabrication sequencing before production begins, catching interference issues that would otherwise surface during erection.
Steel Grade Selection and Manufacturing Process Explained
The Q-series grades (Q195, Q235, Q345) follow the Chinese GB standard system where the number indicates minimum yield strength in MPa. S235JR, S275JR, and S355JR are European EN standard equivalents with specified impact testing at room temperature (JR designation). ASTM A500 covers both Grade B (290 MPa yield) and Grade C (345 MPa yield) for structural applications. Selecting the correct grade equivalence between these systems prevents specification mismatches during international procurement. [NEED_CITE: steel grade equivalence between ASTM A500 and EN 10219 standards]
ERW (Electric Resistance Welded) production forms the tube from coil through continuous forming and welds the seam through electrical resistance heating — suitable for the thin-wall range of 0.9mm–1.4mm specified in this product. Hot rolled hollow sections undergo forming at elevated temperatures, producing a mill scale surface finish that provides some corrosion resistance during storage and transit. The black, non-oiled surface treatment is standard for structural applications where subsequent painting or galvanizing will be applied by the contractor.
Wall thickness tolerance of ±1% on these ASTM A500 carbon steel square rectangular hollow sections ensures that theoretical weight calculations match actual delivered weight within acceptable margins. When tolerance control lapses, the gap between ordered tonnage and received tonnage creates disputes that delay payment release and damage project cash flow.
Hidden Costs of Incorrect Hollow Section Procurement
Procuring ASTM A500 carbon steel square rectangular hollow sections without verified material certification creates a chain of risks: failed third-party inspection at destination port, customs hold due to missing or non-conforming test certificates, and structural engineers refusing to sign off on erected frames without traceable heat numbers. [NEED_CITE: structural steel procurement documentation requirements for international projects] Negative tolerance exceeding specification limits does not just affect weight — it reduces load-carrying capacity below design assumptions, creating latent safety concerns that surface only during extreme loading events. The cost of replacing erected structural members far exceeds the original material price difference between verified and unverified supply sources.
Why Project Procurement Teams Source Hollow Sections Through Integrated Suppliers
Vertical integration from raw steel production to finished fabrication eliminates the material traceability gap that occurs when fabricators source tubes from third-party mills. Our own steel mill with 3 production lines produces the ASTM A500 carbon steel square rectangular hollow sections, meaning every heat number on the mill test certificate traces back to our melting facility — not an unknown supplier. With 2,800+ specifications maintained in inventory, project teams avoid the lead time penalties of waiting for custom rolling campaigns. Certified welding procedures (WPS/PQR) and AWS/EN qualified welders ensure that any fabrication work — cutting, bending, welding, punching — maintains the same quality standard as the base material. Complete documentation packages including weld maps, dimensional inspection reports, and coating reports travel with the shipment, satisfying the most stringent EPC client requirements.
Documentation & Compliance
- Mill test certificate documenting ASTM A500 chemical composition and mechanical properties per heat number, traceable to our in-house melting facility
- CE certificate confirming EN 10219 compliance for structural hollow sections destined for European Union markets
- ISO 9001 quality management system certificate covering the full production process from raw material receipt to finished dispatch
- SGS or BV third-party inspection reports available for pre-shipment verification of dimensions, surface quality, and coating thickness
- Material traceability documentation linking each bundle to specific heat numbers with corresponding test certificates
- Complete customs documentation package including packing list, bill of lading, and certificate of origin for destination port clearance
Packaging, Loading & Delivery
- ASTM A500 carbon steel square rectangular hollow sections bundled with steel strips in seaworthy packaging, sized to match 6m, 6.4m, or 12m standard lengths for optimal container utilization
- Black hot rolled surface protected with edge guards and moisture barriers during ocean transit to prevent contact corrosion and handling damage
- Container loading plans optimized for thin-wall hollow sections (0.9mm–1.4mm) to maximize weight utilization without exceeding vessel weight restrictions
- Custom cut-to-length services available, with ends cut plain or prepared per project drawing requirements before bundling
- Heat number and steel grade markings applied to each tube end for on-site identification and traceability verification
- FOB, CIF, and DDP shipping terms available with professional oversized cargo loading and complete export documentation
How to Initiate Procurement for Your Structural Project
Submit your project drawings (PDF/DWG), required steel grades, quantities, and destination port to receive a detailed quotation including material, fabrication, coating, and logistics costs within 24 hours. Our engineering team will review shop drawings and confirm fabrication sequencing before production begins. Request mill test certificates and third-party inspection arrangements as part of your initial inquiry to ensure documentation compliance with your project specifications.
Start Your ASTM A500 Hollow Section Inquiry
Share your specifications, steel grade requirements, and target delivery schedule to receive pricing and material certification details.
Contact: Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.xjystructure.com
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@xjystructure.com
Address: No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China
Frequently Asked Questions
Q: How do ASTM A500 grades correspond to EN 10219 and GB/T 6728 specifications?
A: ASTM A500 Grade B (290 MPa yield) approximates S275JR in the EN system, while Grade C (345 MPa yield) aligns with S355JR. In the Chinese GB system, Q235 corresponds roughly to S235JR and Q345 to S355JR. Our engineering team provides grade equivalence confirmation for your specific project standards during the quotation stage.
Q: Can third-party inspection be arranged before shipment?
A: Yes. SGS, BV, and TÜV third-party inspections are available for dimensional verification, surface quality assessment, and coating thickness measurement. Inspection coordination is included in our standard export documentation package.
Q: What processing services are available beyond standard tube supply?
A: We provide CNC cutting, plasma and flame cutting, drilling, bending, MIG/MAG/SAW welding, shot blasting, and painting services. All fabrication follows approved welding procedures with certified welders, and complete QC documentation accompanies processed components.
Q: What surface treatment options are available for these hollow sections?
A: Standard supply is hot rolled black (non-oiled) finish. Additional options include shot blasting to Sa 2.5, primer painting, hot-dip galvanizing, and 3PE coating depending on project corrosion protection requirements.
Q: What is the minimum order quantity and can lengths be customized?
A: The minimum order quantity is 5 tons. Standard lengths are 6m, 6.4m, and 12m, with custom cut-to-length available per project requirements.
