Description
Factory-Direct Bulk Supply — Every ASTM A500 square steel tube rolls off our Jinan production lines with original mill test certificates, eliminating trader markups for volume buyers.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | ASTM A500 Square Steel Tube |
| Product Type | Square Hollow Structural Section |
| Steel Grade | ASTM A500 Gr.B, S235, S275, S355, STK400 |
| Standard | ASTM A500, ASTM A53, GB/T 3091 |
| Section Shape | Square |
| Size Range | 19mm × 19mm – 800mm × 800mm |
| Wall Thickness | 1 – 30 mm |
| Length | 5.8m / 6m / 11.8m / 12m / Random Length |
| Technique | ERW Welded / Seamless |
| Surface Treatment | Black Painting / Hot-Dip Galvanized / Varnish / Bare |
| Tolerance | ±1% |
| Ends | Plain |
| Application | Steel Structures / Construction Frames / Curtain Wall / Support Tubes |
| MOQ | 5 Tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Commercial Construction | Building frames, curtain wall support structures, column systems |
| Industrial Infrastructure | Equipment support frames, conveyor structures, platform scaffolding |
| EPC Project Procurement | Multi-specification bulk supply for large-scale structural developments |
| Steel Fabrication | Machinery bases, warehouse racking systems, bracing members |
What Wall-Thickness Tolerance Costs on a Structural Frame Order
A 0.3mm wall deviation on a 6mm ASTM A500 square steel tube means 5% less load-bearing cross-section — and potentially a failed third-party inspection at destination.
On a Lagos warehouse project I supervised, random micrometer checks pulled two containers of square tubes with wall thickness running well past allowable negative tolerance. The mill certificates looked perfect on paper. The physical tubes told a different story. Two containers had already cleared customs before we caught it. Air-freighting replacements ate the entire margin on that shipment and then some. [NEED_CITE: EN 10219 cold-formed hollow section dimensional tolerance requirements]
How Size Range Meets Structural Engineering Demands
From 19×19mm light-gauge framing members to 800×800mm heavy structural columns, this ASTM A500 square steel tube range covers the full spectrum of commercial and industrial construction needs. The 1–30mm wall thickness band allows engineers to specify precisely the load capacity required without over-ordering material weight. ERW welded sections handle standard framing efficiently, while seamless options serve high-stress connection points where weld-line integrity matters. Our 2,800+ specification inventory means standard sizes ship within days, not weeks.
Engineering Compliance and Certification Requirements
Structural hollow sections must satisfy both material standards and dimensional tolerances simultaneously. ASTM A500 Gr.B governs North American projects, while S355 serves European specifications under EN 10219. [NEED_CITE: steel grade equivalence between ASTM A500 and EN 10210 standards] Surface treatment selection — black painted for indoor applications, hot-dip galvanized for exterior or corrosive environments — directly affects service life and maintenance cycles. Every batch carries original mill test certificates documenting chemical composition and mechanical properties per the specified standard. Third-party SGS or BV inspection remains available for projects requiring independent verification before shipment.
Steel Grade Selection and Manufacturing Process
ASTM A500 Gr.B provides minimum 290 MPa yield strength for general structural applications, while S355 delivers higher capacity for heavily loaded members. The S-series grades (S235, S275, S355) follow European normalization, with yield strength incrementally increasing across the range. STK400 serves Japanese-specification projects requiring JIS G3466 compliance. [NEED_CITE: structural hollow section steel grade selection criteria for load-bearing applications]
ERW welded production offers cost efficiency for standard sizes with consistent quality across high volumes. Seamless manufacturing eliminates the weld seam entirely, preferred for critical structural connections or applications where internal corrosion resistance matters. Surface treatment options include black painting for protected environments, hot-dip galvanizing for long-term corrosion protection, or bare finish for projects applying field coating systems.
The Hidden Cost of Unverified Material Certificates
Purchasing ASTM A500 square steel tubes without verified mill test certificates creates compounding risk. Material arriving at destination with certificates that don’t match physical properties triggers customs holds, third-party inspection failures, and potential rejection by structural engineers. [NEED_CITE: consequences of non-compliant structural steel in international construction projects] Negative tolerance exceeding standard limits reduces actual load capacity below design specifications, creating safety liability. The cost of air-freighting replacement material — or worse, dismantling installed sections — dwarfs any initial price savings from unverified sources.
Why Volume Buyers Source ASTM A500 Square Steel Tubes From Jinan
Factory-direct pricing eliminates trader margins on every metric ton shipped. Three production lines running simultaneously deliver monthly capacity exceeding 20,000 tons, supporting both urgent spot orders and scheduled project deliveries. Every heat number traces back to original mill test certificates documenting chemical composition and mechanical test results. Our in-house laboratory conducts three-stage inspection before any tube leaves the facility. Lloyd’s CE certification under EN 10210/10219 and FPC approval satisfy European market compliance requirements. Professional export teams optimize container loading for heavy structural sections, reducing per-unit freight costs. Volume discount programs reward long-term supply partnerships with tiered pricing reviews every six months.
Documentation & Compliance
- Mill test certificate documenting ASTM A500 Gr.B chemical composition and yield strength per ASTM A500 standard
- CE certificate confirming compliance with EN 10210/EN 10219 for European market structural applications
- ISO 9001:2015 quality management system certificate covering production processes and inspection protocols
- SGS or BV third-party inspection report available for independent verification of dimensional accuracy and material properties
- Full material traceability by heat number linking each tube to original production batch and test results
- Complete customs documentation package including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- ASTM A500 square tubes bundled with steel strips and edge protectors, sized to prevent coating damage during ocean transit
- Hot-dip galvanized sections receive additional wrapping to preserve zinc layer integrity throughout container loading and unloading
- Container loading plans optimized for 5.8m, 6m, and 12m lengths to maximize payload per 20ft and 40ft containers
- Random length and cut-to-order options available for 19×19mm through 800×800mm sections, minimizing on-site waste
- Heat number and steel grade markings stenciled on each bundle for destination yard identification and traceability
- FOB, CIF, and DDP trade terms available with professional customs clearance support at destination ports
Securing Your ASTM A500 Square Steel Tube Quotation
Submit specifications including outer dimensions, wall thickness, steel grade, quantity, and destination port to receive competitive bulk pricing within 12 hours. Request original mill test certificates and arrange SGS/BV third-party inspection before production begins. Confirm container loading optimization and delivery schedule for your project timeline.
Frequently Asked Questions
Q: What steel grades are available for ASTM A500 square steel tubes?
A: We supply ASTM A500 Gr.B for North American specifications, S235, S275, and S355 for European EN 10219 compliance, and STK400 for JIS G3466 Japanese standard projects. Each grade carries original mill test certificates documenting chemical composition and mechanical properties.
Q: Can you provide third-party inspection before shipment?
A: Yes, SGS and BV third-party inspections are available upon request. We coordinate inspection scheduling with your nominated surveyor and provide complete documentation including dimensional verification, visual inspection reports, and material test confirmation.
Q: What is the minimum order quantity for custom sizes?
A: Standard sizes from our 2,800+ specification inventory ship with 5-ton MOQ. Custom non-standard dimensions or special lengths require production scheduling with typical lead times of 15–25 days depending on specification complexity.
Q: How do you ensure wall thickness tolerance meets ASTM A500 requirements?
A: Our in-house laboratory conducts three-stage inspection including dimensional verification at production, pre-finishing, and final pre-shipment stages. Every batch carries original mill test certificates. Third-party SGS/BV inspection provides independent verification for projects requiring additional assurance.
Q: What surface treatment options work best for outdoor structural applications?
A: Hot-dip galvanizing provides long-term corrosion protection for exterior exposure, typically lasting 20+ years in moderate environments. Black painting suits protected indoor applications. Bare finish works for projects applying field coating systems or requiring weld preparation without coating removal.
Get Your ASTM A500 Square Steel Tube Quote Today
Email your specifications to admin@sdxinjiyuan.com or contact via WhatsApp at +86 188 5315 7756 for bulk pricing, mill test certificates, and delivery confirmation within 12 hours.
