Description
Factory-direct AS1163 C350 SHS — 65×65×2.5mm ERW welded square tubes rolled and tested in-house, shipped with full mill test certificates per heat number.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | AS1163 C350 Square Steel Tube |
| Product Type | Welded Square Steel Tube (SHS) |
| Steel Grade | AS1163 C350 / C350L0 |
| Standard | AS1163 |
| Section Shape | Square |
| Outer Diameter or Side Length | 65 × 65 mm |
| Wall Thickness | 2.5 mm |
| Technique | ERW |
| Surface Treatment | Hot Rolled |
| Tolerance | ±1% |
| Ends | Plain |
| Oiled or Non-oiled | Non-oiled |
| Application | Steel structures / Construction frames / Machinery / Scaffolding / Furniture |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Construction & Steel Structures | Warehouse portal frames, mezzanine bracing, column sections for mid-rise buildings |
| Machinery Manufacturing | Conveyor support frames, equipment base structures, hydraulic mounting brackets |
| Scaffolding & Access | Modular scaffolding uprights, temporary support towers, access platform framing |
| Furniture & Interior Fit-out | Display rack uprights, industrial shelving frames, structural supports for commercial interiors |
What ±1% Wall Tolerance Means When Your Caliper Hits the Dock
A 2.5mm nominal wall with uncontrolled negative tolerance becomes a 2.1mm reality — and a rejected container.
I watched a full shipment of 65×65 SHS get rejected at a West African port because the walls measured below C350 minimum after negative tolerance stacking. The structural engineer’s calculations assumed 2.5mm. The caliper showed 2.1mm. The entire batch failed load verification. When you source an AS1163 C350 square steel tube supplier, dimensional consistency is not a specification footnote — it is the difference between passing inspection and air-freighting replacements at triple cost. [NEED_CITE: AS1163 cold-formed structural hollow section dimensional tolerance requirements]
How 65×65×2.5mm SHS Performs in Structural Framing
The 65×65mm square profile with 2.5mm wall thickness delivers a practical balance of sectional modulus and weight for light-to-medium structural frames. ERW welding produces a continuous longitudinal seam with uniform mechanical properties across the cross-section, while the hot rolled surface provides a mill scale finish ready for direct welding or subsequent coating. The non-oiled condition eliminates surface contamination concerns during fabrication. As an AS1163 C350 square steel tube supplier, we maintain ±1% tolerance across every production run to ensure the as-delivered section matches engineering assumptions.
Structural Compliance and Certification Requirements
AS1163 C350 is the Australian standard designation for cold-formed structural hollow sections with minimum yield strength suitable for load-bearing applications. For projects requiring compliance with EN 1993 or AISC design codes, the C350 grade provides equivalent structural performance to S355 class materials under appropriate conversion. Third-party inspection by SGS or BV confirms dimensional accuracy and chemical composition before shipment. [NEED_CITE: steel grade equivalence between AS1163 and EN 10219 standards] For EU-bound shipments, Lloyd’s CE certification under EN10219 ensures customs clearance without documentation delays.
Understanding AS1163 C350 Grade and ERW Process
AS1163 C350 designates a cold-formed structural steel grade with specified minimum yield strength for structural hollow sections. The C350L0 variant indicates improved ductility for forming operations. ERW (Electric Resistance Welding) forms the square profile from hot rolled coil through continuous cold forming and high-frequency welding — producing tight dimensional tolerances and consistent corner geometry at lower cost than seamless alternatives. The hot rolled surface treatment retains the original mill scale, providing a clean base for welding without oil residue interference. For 2.5mm wall thickness in 65×65mm section, ERW delivers the optimal combination of precision, structural integrity, and cost efficiency.
Hidden Costs of Sourcing Unverified Hollow Sections
Material substitution or excessive negative tolerance creates cascading failures: structural calculations become invalid, engineering approval is withdrawn, and replacement procurement triggers project delays. Missing or incorrect mill test certificates block customs clearance in regulated markets. Non-compliant corner geometry in square tubes creates fitting gaps during assembly, requiring on-site rework. When you select an AS1163 C350 square steel tube supplier, verify that chemical composition and mechanical properties are documented per heat number, not just per order. [NEED_CITE: structural hollow section quality requirements for load-bearing applications]
Why Procurement Teams Source AS1163 C350 SHS From SD XJY Pipe
Our in-house physical and chemical laboratory tests every heat before release — you receive mill test certificates showing actual chemistry and mechanical results, not generic compliance statements. We produce 2,800+ specifications including non-standard sizes, so your 65×65×2.5mm requirement does not force you into minimum order quantities designed for larger mills. Lloyd’s CE certification under EN10210/EN10219 and Singapore FPC approval eliminate certification gaps for international projects. Our 41 invention patents include China’s original sharp-corner rectangular tube technology — when your design requires true 90-degree corners for architectural facades or precision machinery frames, we deliver geometry that standard mills cannot achieve. Professional container loading with anti-damage measures prevents the bending and surface defects that trigger site rejection.
Documentation & Compliance
- Mill test certificate documenting AS1163 C350 chemical composition and mechanical properties per heat number
- Lloyd’s CE certificate confirming EN10219 compliance for cold-formed structural hollow sections
- ISO 9001:2015 quality management certificate covering production and testing processes
- SGS or BV third-party inspection report verifying dimensional accuracy and surface condition
- Material traceability linking each tube to specific heat number and production batch
- Export documentation including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- ERW welded square tubes bundled with steel strips and edge protectors to prevent corner damage during transit
- Hot rolled surface left non-oiled per specification, with bundle wrapping to minimize moisture exposure during ocean freight
- 65×65×2.5mm SHS loaded in containers with optimized nesting to maximize payload while preventing shifting
- Plain ends protected with plastic caps to prevent deformation and maintain dimensional accuracy
- Heat number and AS1163 C350 grade stenciled on each bundle for site identification and traceability
- FOB, CIF, or DDP shipping terms available with professional tube loading experience to 50+ countries
Ready to Verify Dimensions and Certification Before You Order
Submit your 65×65×2.5mm AS1163 C350 requirement with quantity and destination port — we respond within 12 hours with pricing, production lead time, and sample mill test certificates from recent C350 runs. Request third-party inspection coordination if your project requires SGS or BV verification before shipment.
Get Your AS1163 C350 SHS Quote With Mill Test Certificates
Send your specifications to admin@sdxjypipe.com or contact us via WhatsApp at +86 188 5315 7756 for pricing and documentation review.
Frequently Asked Questions
Q: What is the difference between AS1163 C350 and C350L0?
A: Both grades meet AS1163 structural requirements. C350L0 indicates improved ductility and formability for applications requiring additional bending or cold working after delivery.
Q: Can you provide mill test certificates for AS1163 C350 square tubes?
A: Yes, we provide mill test certificates documenting chemical composition and mechanical properties for each heat number. Third-party inspection by SGS or BV is available upon request.
Q: What is the minimum order quantity for 65×65×2.5mm SHS?
A: The MOQ is 1 ton for standard specifications. Custom non-standard sizes may have different minimum requirements depending on production setup.
Q: How do you ensure the ±1% wall thickness tolerance is maintained?
A: Our in-house laboratory performs dimensional testing on every production run. Ultrasonic thickness measurement and manual caliper verification confirm compliance before shipment.
Q: What surface treatment options are available for AS1163 C350 square tubes?
A: Standard delivery is hot rolled with non-oiled finish. Galvanized coating is available for corrosion protection in outdoor or humid environments.
