Description
Factory-direct ASTM A500 square and rectangular steel tube supplier — ERW welded hollow structural sections produced in-house across 3 production lines covering 2,800+ specifications with wall thickness up to 30mm, eliminating middleman markups and specification gaps.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | ASTM A500 Square and Rectangular Steel Tube |
| Product Type | Welded Square and Rectangular Steel Tube (Hollow Structural Section) |
| Steel Grade | ASTM A500 Gr.B, S235, S275, S355, STK400 |
| Standard | ASTM A500, ASTM A53, GB/T 3091 |
| Section Shape | Square / Rectangular |
| 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 wall framing / Support tubes |
| MOQ | 5 Tons |
| Origin | China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Construction & Infrastructure | Building frames, bridge support structures, column and beam assemblies for commercial and industrial buildings |
| Facade & Curtain Wall | Architectural steel framing for glass curtain walls, sharp-corner rectangular tubes for exposed structural aesthetics |
| Steel Structure Fabrication | Raw material supply for welded portal frames, trusses, and mezzanine platforms |
| Industrial Support Systems | Equipment support tubes, conveyor structure frames, solar panel mounting structures |
What Corner Radius Costs You on a Curtain Wall Frame Order
Rounded-corner rectangular tubes create visible gaps at glass frame junctions — a problem that compounds across an entire facade elevation.
When procurement teams order standard ERW rectangular tubes without specifying corner geometry, the resulting R≥2t radii leave inconsistent contact surfaces at welded or bolted connections. On curtain wall projects, this means field crews spend hours shimming and grinding to achieve flush alignment — or worse, the gaps become permanently visible through the glazing system. Sourcing ASTM A500 square and rectangular steel tube from a supplier with patented sharp-corner technology eliminates this uncertainty entirely, delivering right-angle edges that mate cleanly with adjacent framing members [NEED_CITE: cold-formed steel dimensional tolerance requirements for architectural applications].
The second pain point is specification fragmentation. Projects requiring mixed sizes — from small 19×19mm support tubes to 800×800mm primary columns — often end up split across multiple suppliers, each with different mill test certificate formats and tolerance interpretations. Consolidating under one ASTM A500 square and rectangular steel tube manufacturer with full laboratory testing capability ensures consistent chemistry, uniform surface finish, and traceable heat numbers across every size in the order.
Matching Hollow Section Geometry to Structural and Architectural Demands
ASTM A500 square and rectangular steel tube in sizes from 19×19mm to 800×800mm covers the full spectrum from secondary bracing members to primary structural columns. The ERW welded process produces consistent corner geometry critical for moment-resisting connections in steel frames, while the ±1% dimensional tolerance ensures predictable fit-up at site. For curtain wall applications, the patented sharp-corner rectangular tube variant delivers clean 90-degree edges that eliminate visible gaps in exposed architectural framing — a detail that standard rounded-corner tubes simply cannot achieve. Wall thickness options from 1mm to 30mm accommodate both light-gauge purlin applications and heavy structural columns requiring higher moment capacity.
Engineering Compliance and Certification Requirements
Structural hollow sections conforming to ASTM A500 must meet the chemical composition and mechanical property requirements defined in the standard, verified through mill test certificates documenting heat-by-heat analysis [NEED_CITE: ASTM A500 cold-formed welded and seamless carbon steel structural tubing requirements]. For projects targeting EU markets, Lloyd’s CE certification under EN 10219 and EN 10210 provides the necessary declaration of performance for customs clearance and engineer approval. Surface treatment selection — black painted for indoor structural use, hot-dip galvanized for corrosive environments, or bare for sites applying field coating — must align with the project’s environmental exposure classification. Standard lengths of 5.8m, 6m, 11.8m, and 12m minimize on-site cutting waste, while random length options accommodate non-standard structural bay dimensions.
Understanding Steel Grade Selection and ERW Welding Process
The ASTM A500 specification covers multiple grades — Gr.B being the most widely specified for general structural applications — with equivalent alternatives including EN S235, S275, S355 and JIS STK400 available from the same production facility [NEED_CITE: steel grade equivalence between ASTM A500 and EN 10219 standards]. The ERW welded manufacturing process forms flat steel strip through progressive rolling into square or rectangular cross-sections, with the longitudinal weld seam creating a continuous joint that undergoes ultrasonic inspection. This process offers cost advantages over seamless alternatives for non-pressure structural applications while maintaining dimensional consistency across long production runs. Wall thickness from 1mm to 30mm with ±1% tolerance means the theoretical weight calculation reliably predicts actual delivered weight — critical for projects priced on tonnage rather than piece count. For architectural applications requiring exposed steel framing, the sharp-corner rectangular tube technology produces true 90-degree external corners that standard cold-forming dies cannot achieve, eliminating the rounded transition that compromises visual continuity in curtain wall systems.
Hidden Costs of Incorrect Hollow Section Procurement
Ordering ASTM A500 square and rectangular steel tube without verifying mill test certificate authenticity or dimensional tolerance compliance creates downstream risks that rarely appear in initial price comparisons. Material arriving with chemistry outside ASTM A500 Gr.B limits may pass visual inspection but fail structural engineer approval during connection design verification — triggering costly replacement orders with extended lead times [NEED_CITE: consequences of non-conforming structural steel in construction projects]. Missing or incorrectly referenced CE certification under EN 10219/10210 results in customs holds at EU ports, with demurrage charges accumulating while documentation disputes resolve. Negative tolerance exceeding standard allowances reduces actual wall thickness below design assumptions, compromising load capacity without visible indication until structural testing reveals the deficiency.
Procurement Confidence Through Verified Manufacturing Capability
Every ASTM A500 square and rectangular steel tube order ships with mill test certificates generated from in-house physical and chemical laboratories — not third-party reprints or supplier-declared values. The production facility holds 41 invention patents including China’s original sharp-corner rectangular tube technology, covering 2,800+ specifications that allow consolidating mixed-size orders under single-source procurement. Full international certification portfolio — ISO 9001:2015, Lloyd’s CE under EN 10219/10210, Singapore FPC, and SGS/BV verification — provides documented compliance for regulated markets across 50+ export destinations. Custom non-standard sizes and lengths accommodate project-specific requirements without the typical high-MOQ barriers, while professional container loading procedures prevent the bending and surface damage that plague improperly secured tube shipments.
Documentation & Compliance
- Mill test certificate documenting ASTM A500 Gr.B chemical composition and mechanical properties per heat number, provided with every shipment
- Lloyd’s CE certificate under EN 10219 and EN 10210 for cold-formed structural hollow sections, enabling EU customs clearance
- ISO 9001:2015 quality management system certificate covering the full ERW welded tube production process
- SGS or BV third-party inspection report available upon request, verifying dimensional accuracy and surface treatment compliance
- Material traceability documentation linking each tube to its heat number for welding procedure qualification and structural audit requirements
- Complete customs documentation package including packing list, bill of lading, and certificate of origin formatted for destination country requirements
Packaging, Loading & Delivery
- ASTM A500 square and rectangular steel tube bundled with high-tensile steel strips at regular intervals, with edge protectors preventing surface damage to black painted or galvanized finishes during ocean transit
- Galvanized tubes receive additional plastic wrapping at bundle ends to preserve zinc coating integrity at cut edges and weld zones
- Container loading optimized by nesting smaller 19×19mm through 100×100mm sections inside larger 400×400mm and above, maximizing payload per 20ft and 40ft containers for mixed-size orders
- Standard lengths of 5.8m and 11.8m selected specifically to fit standard container internal dimensions without overhang, eliminating the need for open-top or flat-rack shipping at premium freight rates
- Heat number and steel grade stenciled on each tube end face, with bundle tags showing size, wall thickness, length, and piece count for rapid site identification
- FOB, CIF, and DDP shipping terms available with professional tube loading supervision ensuring weight distribution and securing compliance with maritime transport regulations
Initiating Your ASTM A500 Hollow Section Inquiry
Submit your complete specification package — section dimensions, wall thickness, steel grade, surface treatment preference, total quantity, and destination port — to receive a detailed quotation including unit pricing, production lead time, and applicable certification documentation. For projects requiring non-standard sizes or mixed specifications across multiple ASTM A500 square and rectangular steel tube dimensions, our engineering team provides consolidated sourcing solutions with single-point quality responsibility.
Request Your ASTM A500 Square and Rectangular Steel Tube Quotation
Send your technical specifications and quantity requirements to receive pricing, mill test certificate samples, and certification documentation within 12 hours.
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Frequently Asked Questions
Q: What is the difference between ASTM A500 Gr.B and Gr.C, and which should I specify for structural applications?
A: ASTM A500 Gr.C offers higher minimum yield strength than Gr.B, making it suitable for applications requiring greater load capacity or where weight optimization is critical. For general building frames and curtain wall framing, Gr.B typically provides adequate performance at lower cost. Both grades are available in our ASTM A500 square and rectangular steel tube range across all sizes from 19×19mm to 800×800mm.
Q: Can you produce non-standard sizes outside your published range with reasonable MOQ?
A: Yes, custom non-standard sizes are available beyond the standard 19×19mm to 800×800mm range. Our 3 production lines covering 2,800+ specifications allow flexible tooling adjustments for special dimensions. MOQ for custom sizes depends on the specific profile complexity but remains accessible for project-based procurement rather than requiring mass-production quantities.
Q: What surface treatment options are available, and how do I select the right one for my project environment?
A: ASTM A500 square and rectangular steel tube is available in black painted finish for indoor structural applications, hot-dip galvanized for outdoor or corrosive environments, varnished for temporary protection during storage and transport, or bare for projects applying field coating systems. Selection depends on environmental exposure classification, expected service life, and whether field painting will be applied after installation.
Q: Do your products carry CE certification required for EU market import and construction use?
A: Yes, our cold-formed structural hollow sections hold Lloyd’s CE certification under both EN 10219 and EN 10210 standards, providing the declaration of performance required for EU customs clearance and compliance with Construction Products Regulation. This certification covers the full ASTM A500 square and rectangular steel tube range and is recognized across all EU member states.
Q: How do you ensure dimensional accuracy and wall thickness consistency across large orders?
A: Every production batch undergoes dimensional verification and wall thickness measurement in our in-house physical laboratory before shipment. The ±1% tolerance specification applies across the full size range, with mill test certificates documenting actual measurements for representative samples from each heat. Third-party inspection through SGS or BV is available for projects requiring independent verification.
