Description
Factory-Direct AS 1163 C350 SHS — backed by original mill test certificates on every batch
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | AS 1163 C350 Square Hollow Section |
| Product Type | Square / Rectangular Steel Tube (SHS/RHS) |
| Steel Grade | C350, Q195, Q235, Q345, S235JR, S275JR, S355JR |
| Standard | AS 1163, ASTM, ISO 9001 |
| Section Shape | Square |
| Side Length | 65 × 65 mm |
| Wall Thickness | 2.5 mm |
| Technique | ERW (Electric Resistance Welded) |
| Surface Treatment | Hot Rolled |
| Tolerance | ±1% |
| Ends | Plain |
| Application | Steel structures / Construction frames / Machinery / Scaffolding / Furniture / Fluid pipe / Gas pipe / Oil pipe / Boiler pipe |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Construction & Infrastructure | Building frames, scaffolding systems, structural columns |
| Industrial & Mechanical | Machinery bases, conveyor structures, equipment supports |
| Fluid & Gas Transport | Boiler pipes, gas line structures, oil pipeline supports |
| Steel Fabrication | Welded assemblies, truss members, connection brackets |
What Dimensional Tolerance Costs on a Structural Frame Order
±1% tolerance on a 65×65×2.5mm C350 SHS keeps bolt-hole alignment within structural code limits.
When procurement teams source an AS 1163 C350 square hollow section supplier without verifying tolerance claims, out-of-square geometry forces field reaming or full member replacement on-site. A single misaligned column connection can cascade into days of delay on a steel erection schedule. We have seen containers arrive with wall thickness deviations that pushed theoretical weight below design assumptions — the kind of issue that only surfaces when a third-party inspector pulls random samples at the port [NEED_CITE: EN 10219 cold-formed hollow section dimensional tolerance requirements]. Fragmented sourcing from multiple mills makes this worse: each batch carries its own tolerance profile, and no single supplier takes responsibility for the full structural package.
How 65×65×2.5mm C350 SHS Matches Structural Frame Requirements
The 65×65mm square profile with 2.5mm wall thickness sits in a practical range for light-to-medium structural framing — stiff enough to resist lateral deflection in scaffolding and mezzanine systems, yet light enough for manual handling on congested sites. ERW welding produces a continuous longitudinal seam that maintains uniform strength around the full perimeter, which matters when load paths shift during construction sequencing. As an AS 1163 C350 square hollow section supplier, we hold 65×65×2.5mm in ready stock alongside adjacent sizes, so project teams can pull trial quantities without committing to full-container volumes.
Engineering Compliance and Certification Pathways
Structural hollow sections in AS 1163 C350 grade must meet chemical composition and mechanical property thresholds defined by the Australian Standard, and project specifiers frequently require cross-reference to EN 10210 or ASTM A500 for international projects [NEED_CITE: steel grade equivalence between AS 1163 and EN 10210 standards]. Hot rolled surface treatment leaves a mill scale finish that accepts primer coatings directly — no additional shot blasting needed for indoor structural applications. For projects targeting European markets, Lloyd’s CE certification under EN 10210/10219 and FPC factory production control documentation ensure customs clearance without hold-ups. Plain ends ship ready for site welding or mechanical connection, and fixed-length cutting is available to reduce field preparation time.
Steel Grade Selection and ERW Process Fundamentals
C350 per AS 1163 is a structural grade designed for cold-formed hollow sections, offering higher yield strength than standard carbon grades like Q195 or Q235 — making it suitable for load-bearing frames where weight optimization matters. The Q-series (Q195–Q345) follows the Chinese GB/T standard system, while S235JR through S355JR align with European EN norms; sourcing an AS 1163 C350 square hollow section supplier who stocks multiple grade families allows cross-standard substitution when project specs shift mid-tender. ERW (Electric Resistance Welded) process joins the strip edges through localized heating and pressure, producing a weld seam that is fully fused and typically matches base metal strength — the standard choice for square and rectangular hollow sections in structural and mechanical applications. Hot rolled surface treatment means the tube is formed from hot-rolled coil without additional cold drawing, keeping costs lower than seamless alternatives while maintaining adequate dimensional accuracy for most framing uses. The ±1% tolerance on side length and wall thickness reflects ERW process capability and ensures consistent fit-up during fabrication.
Hidden Costs of Procuring the Wrong Grade or Missing Certification
Specifying C350 but receiving Q235-grade material may pass visual inspection but fails structural load calculations — the kind of substitution that triggers full batch rejection during third-party testing and forces project delays measured in weeks, not days. Missing or incomplete mill test certificates create customs holds at destination ports, particularly in markets with strict import documentation requirements [NEED_CITE: steel import documentation requirements for customs clearance]. Negative tolerance abuse — where wall thickness consistently falls below nominal — reduces load capacity and voids structural engineering sign-off, turning a cost-saving purchase into a liability. An AS 1163 C350 square hollow section supplier who provides original mill certificates with heat-number traceability eliminates these risks before the container leaves the mill.
Why Project Buyers Source C350 SHS Through Xin Jiyuan
Every batch of C350 square hollow section ships with original mill test certificates documenting chemical composition and mechanical properties — no forwarded copies, no third-party reprints. Our in-house laboratory runs three-stage inspection covering dimensional checks, weld seam integrity, and mechanical testing before any material clears for dispatch. With 2,800+ specifications in ready stock across square, rectangular, and round profiles, project teams consolidating structural frames, scaffolding, and machinery supports into one container avoid the coordination overhead of managing multiple suppliers. SGS and BV third-party inspection is available on request for buyers who require independent verification before shipment. Lloyd’s CE certification under EN 10210/10219 and FPC documentation cover European market compliance, while ISO 9001:2015 quality management underpins the full production chain. Custom non-standard sizes and fixed-length cutting ship within typical production lead times, with MOQ starting from 1 ton for trial orders. Professional export teams handle container loading optimization — critical when mixing 65×65mm SHS with larger sections to maximize payload per TEU.
Documentation & Compliance
- Mill test certificate documenting C350 chemical composition and mechanical properties per AS 1163, with heat number traceability for every bundle
- CE certificate under EN 10210/10219 and EN 10219 for European market compliance and customs clearance
- ISO 9001:2015 quality management certificate covering the full ERW production and inspection process
- SGS or BV third-party inspection report available on request for independent verification of dimensional and mechanical compliance
- Material traceability by heat number linking each bundle to its original coil and production batch
- Complete customs documentation package including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- Hot rolled C350 SHS bundled with steel strips and edge protectors to prevent surface damage and maintain bundle integrity during ocean transit
- Plain-end tubes packed in seaworthy bundles with clear heat number and grade marking for site identification and traceability
- Container loading optimized for 65×65×2.5mm square sections, with nested stacking plans that maximize payload while protecting dimensional tolerance
- Fixed-length cutting available to project specifications, reducing field preparation and waste on congested construction sites
- FOB, CIF, and DDP shipping terms supported, with professional documentation handling for customs clearance at destination ports
- Real-time shipment tracking and dedicated account management for long-term supply partners
How to Initiate a Bulk Inquiry for C350 SHS
Submit your specifications — including 65×65×2.5mm dimensions, C350 grade, quantity, and destination port — via email or WhatsApp to receive a competitive bulk quotation with volume pricing, mill test certificate confirmation, and production lead times. Non-standard size requests and cross-standard grade substitution inquiries are reviewed within 12 hours. Third-party inspection arrangements and container loading optimization plans are confirmed before deposit, ensuring full alignment with project requirements.
Frequently Asked Questions
Q: Can AS 1163 C350 be substituted with EN 10210 S355JR or ASTM A500 Grade B?
A: Cross-standard substitution depends on project engineering approval. C350 per AS 1163, S355JR per EN 10210, and Grade B per ASTM A500 have overlapping but distinct chemical and mechanical requirements. We supply all three grade families and provide mill test certificates for grade verification — final substitution decisions rest with the project structural engineer.
Q: What documentation accompanies a C350 SHS shipment?
A: Every batch ships with original mill test certificates documenting chemical composition and mechanical properties per AS 1163, with heat number traceability. CE certificates under EN 10210/10219, ISO 9001 quality certificates, and complete customs documents (packing list, B/L, certificate of origin) are included. SGS or BV third-party inspection reports are available on request.
Q: What is the MOQ for non-standard sizes outside the 65×65×2.5mm range?
A: Trial orders start from 1 ton for standard specifications held in ready stock. Custom non-standard sizes and wall thickness variations follow typical production lead times, with MOQ depending on the specific profile and quantity. Full-container bulk orders receive volume-based pricing.
Q: How do you ensure dimensional tolerance on ERW welded square tubes?
A: Our ERW production lines maintain ±1% tolerance on side length and wall thickness through in-process dimensional monitoring and three-stage final inspection covering geometry, weld seam integrity, and surface quality. Third-party SGS or BV inspection is available for buyers requiring independent verification before shipment.
Q: Can you consolidate multiple steel product categories into one container?
A: Yes. We supply square and rectangular hollow sections, round pipes, steel plates, section steel (H-beam, channel, angle), and structural fabrication from one facility. Container loading plans are optimized to maximize payload when mixing 65×65mm SHS with larger sections or other product categories, reducing per-ton freight costs.
Request Your C350 SHS Quotation with Mill Test Certificates
Submit your specifications — dimensions, grade, quantity, and destination — to receive factory-direct pricing with complete documentation.
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