Description
Factory-Direct Square Steel Tube Supply — Every ASTM A500 square steel tube we ship carries a verified heat number and original mill test certificate, eliminating grade substitution risks at your fabrication yard.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | ASTM A500 Square Steel Tube |
| Product Type | Square Steel Tube (SHS) |
| Steel Grade | 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 | Welded (ERW) / Seamless |
| Surface Treatment | Black Painting / Galvanized / Varnish / Bare |
| Tolerance | ±1% |
| Ends | Plain |
| Application | Construction structures, Building frames, Curtain walls, Support structures, General structural applications |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Steel Fabrication | Structural frames, column supports, truss assemblies, equipment skids |
| Construction | High-rise building frames, curtain wall mullions, canopy structures |
| Infrastructure | Bridge handrails, highway sign gantries, sound barrier supports |
| Machinery Manufacturing | Conveyor frames, crane booms, machine base supports |
| Shipyards | Deck structures, accommodation module frames, equipment mounting bases |
Negative Tolerance Is the Real Cost in Square Hollow Section Procurement
A 0.5 mm wall deviation on a 200×200×8 mm SHS can reduce load capacity by over 10 percent.
I watched a fabricator in Dubai reject an entire container of square tubes because the mill’s negative tolerance pushed 8 mm walls down to 6.8 mm. Their bending dies did not fit. The container sat at Jebel Ali for weeks. That kind of failure does not show up on a commercial invoice — it shows up in rework costs, crane downtime, and arguments over who pays for the replacement shipment. [NEED_CITE: structural hollow section dimensional tolerance standards EN 10210 and ASTM A500] When you source an ASTM A500 square steel tube, the tolerance clause matters as much as the grade clause.
Matching Square Tube Dimensions to Structural Load Paths
Square hollow sections from 19×19 mm up to 800×800 mm cover the full spectrum from light gauge curtain wall mullions to heavy column members in multi-storey frames. The ERW welded route suits general structural applications where internal weld flash is not a concern, while seamless options serve higher-pressure or critical-load scenarios. Wall thickness from 1 mm to 30 mm allows engineers to optimize weight against bending moment requirements. Each ASTM A500 square steel tube we dispatch ships with dimensional inspection data so your site team can verify before welding begins.
Engineering Compliance and Surface Environment Selection
Structural design to AISC or EN 1993 requires documented material properties traceable to heat numbers. [NEED_CITE: ASTM A500 cold-formed welded and seamless structural tubing specifications] For outdoor or marine-adjacent projects, hot-dip galvanized ASTM A500 square steel tube resists corrosion far longer than black painted or bare alternatives. Indoor, climate-controlled environments may only need bare or varnished finishes. CE certification under EN 10219 opens European customs clearance without re-inspection delays. Plain ends arrive ready for site cutting, beveling, or direct welding to gusset plates.
Steel Grade Equivalence Across ASTM, EN, and JIS Systems
ASTM A500 Gr.B roughly corresponds to S275 in the EN system, while S355 delivers higher yield strength for heavier structural members. STK400 from JIS G3466 serves similar general structural roles in Japanese-spec projects. S235 covers lighter, non-critical frames. The key is confirming equivalence before procurement — ordering Gr.B when the engineer specified S355 will fail inspection, and ordering S355 when Gr.B suffices wastes budget. We supply all five grades from the same warehouse, so switching between standards for different project zones does not mean splitting orders across multiple vendors.
What Grade Substitution Costs at Project Handover
Material mismatches surface at the worst possible moment — during final inspection or structural load testing. An ASTM A500 square steel tube stamped with the wrong grade or missing its heat number cannot be certified, regardless of whether the physical material is adequate. [NEED_CITE: mill test certificate requirements for structural steel procurement] Customs authorities in the EU and Middle East increasingly reject shipments lacking third-party inspection reports. The hidden costs are not in the tube price — they are in demurrage fees, re-order lead times, and the engineering re-approval cycle.
Procurement Confidence Through Verified Documentation and Logistics
Every ASTM A500 square steel tube leaves our Jinan facility with an original mill test certificate showing chemical composition and mechanical test results per heat number. Our ISO 9001:2015 certified quality system tracks each bundle from coil slitting through final loading. SGS or BV third-party inspection is available before container sealing. We handle flatbed and open-top container loading for oversized sections up to 800×800 mm, with weight distribution plans that prevent port overweight penalties. Custom cut-to-length service eliminates site waste for fabricators ordering mixed-size bills of material.
Documentation & Compliance
- Mill test certificate documenting Gr.B, S235, S275, S355, or STK400 chemical composition and mechanical properties per ASTM A500 or EN 10219
- CE certificate confirming EN 10219 compliance for European market structural hollow sections
- ISO 9001:2015 quality management certificate covering production and inspection processes
- SGS or BV third-party inspection report available upon request before container sealing
- Full material traceability by heat number linking each bundle to its original slab and rolling heat
- Export customs documents including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- ERW welded and seamless square tubes bundled with high-tensile steel strips, padded at contact points to protect galvanized coatings during ocean transit
- Black painted and varnished surfaces wrapped in waterproof cloth with edge protectors to prevent abrasion on 6m and 12m lengths
- Open-top container or flatbed loading for 800×800 mm sections exceeding standard container door dimensions, with weight distribution calculated per port regulations
- Random length and cut-to-length options available, with 5.8m and 11.8m sizes optimized for 20ft and 40ft standard container loading
- Heat number and steel grade stenciled on each bundle for site identification and traceability verification
- FOB, CIF, and DDP shipping terms with professional heavy cargo logistics handling break-bulk and project cargo requirements
Start Your ASTM A500 Square Steel Tube Inquiry
Send your bill of material with section sizes, wall thickness, steel grade, surface treatment preference, and destination port. We return a detailed quotation with material cost, processing fees, and shipping terms within 12 hours, along with sample mill test certificates for your engineer’s review.
Request Your Quotation and Mill Test Certificate
Submit your specifications — size, grade, quantity, and destination — to receive pricing and verified material documentation.
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@xjyplate.com
Frequently Asked Questions
Q: How do ASTM A500 Gr.B and EN S275 compare in structural applications?
A: ASTM A500 Gr.B and EN 10219 S275JR share similar yield strength ranges and serve equivalent general structural roles. The primary differences lie in chemical composition limits and testing frequency requirements. We supply both grades and can provide cross-reference documentation for your engineer’s approval.
Q: Can I verify material authenticity before shipment?
A: Yes. We provide original mill test certificates showing heat number, chemical composition, and mechanical test results before or with every shipment. SGS or BV third-party inspection is available at our facility prior to container loading for additional verification.
Q: What is the minimum order quantity for custom cut-to-length square tubes?
A: The MOQ is 1 Ton. We offer custom cutting from our standard 6m and 12m stock lengths to your required dimensions. Non-standard sizes outside our 19×19 mm to 800×800 mm range are subject to mill production schedules.
Q: Which surface treatment suits marine or high-humidity environments?
A: Hot-dip galvanized ASTM A500 square steel tube provides the longest corrosion resistance for outdoor, marine-adjacent, or high-humidity applications. Black painted or varnished finishes suit indoor or temporary exposure conditions. Bare tubes require on-site coating after fabrication.
Q: How do you handle shipping for oversized square sections?
A: Sections up to 400×400 mm load efficiently into standard 20ft and 40ft containers. Larger sizes up to 800×800 mm require open-top containers or flatbed transport. We calculate weight distribution and prepare loading plans to prevent overweight penalties and port delays.
Get Your ASTM A500 Square Steel Tube Quote Today
Share your project specifications — dimensions, grade, surface finish, and quantity — and receive a detailed quotation with mill test certificate samples within 12 hours.
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@xjyplate.com
