Description
Direct Mill Supply, No Middlemen — Our own steel production facility with 3 production lines and 2,800+ raw material specifications ensures full traceability from coil to finished BA welded stainless steel square tube.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | 201/304/316L BA Surface Cold Rolled Welded Stainless Steel Square Tube |
| Product Type | Welded Stainless Steel Square Tube |
| Steel Grade | 201, 304, 316, 316L, 316Ti, 430, 439 |
| Standard | GB |
| Section Shape | Square (Rectangular available) |
| Size Range | 40x40mm (custom sizes available) |
| Technique | Cold Rolled, ERW |
| Surface Treatment | BA (Bright Annealed) / Mirror Finish |
| Tolerance | ±1% |
| Length | 1m, 2m, 3m, 6m |
| Welding Line Type | ERW |
| Processing Service | Bending, Welding, Decoiling, Punching, Cutting |
| Application | Decorations, handrails, railings, window frames, balconies, furniture |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Architectural Decoration | Handrails, railings, window frames, balcony systems requiring mirror-quality surface finish |
| Interior Fit-Out | Decorative furniture frames, display fixtures, elevator trim with aesthetic stainless steel finish |
| Commercial Construction | Facade cladding supports, canopy structures in coastal or high-humidity environments |
| Industrial Facility | Cleanroom partitions, food processing area railings where corrosion resistance and hygiene matter |
Surface Finish Consistency Decides Whether Decorative Stainless Steel Tubes Pass Site Inspection
BA finish requires controlled atmosphere annealing at the mill — not a final polish before loading containers.
When I worked site technical in Foshan, we shipped 40×40 BA square tubes for a Middle East hotel decoration job. The client’s third-party inspector flagged weld seam lines and surface scratches visible under lobby lighting. Nearly half the tubes got rejected on site, and we bore the full cost of re-shipment. That job showed me BA finish for decorative use demands mill-level surface control across the entire production run — not just picking good-looking pieces at the warehouse door. Sourcing 304 316L BA finish welded stainless steel square tube from fragmented suppliers creates gaps in surface consistency, material traceability, and welding quality documentation. [NEED_CITE: bright annealed stainless steel surface quality requirements for architectural applications]
Matching BA Surface Finish to Architectural Decoration Requirements
For handrails, railings, and window frames in commercial buildings, the BA finish must deliver uniform reflectivity without visible weld lines or annealing marks. Our vertically integrated production — from cold rolled coil to ERW welding to bright annealing — maintains consistent surface quality across the full 40x40mm cross-section. The ±1% dimensional tolerance ensures clean miter cuts and tight joint fit-up on site, reducing grinding and re-polishing labor. When specifying 304 316L BA finish welded stainless steel square tube for coastal projects, 316L grade provides molybdenum-enhanced corrosion resistance while BA surface eliminates the need for post-fabrication polishing.
Engineering Compliance and Material Certification for Decorative Stainless Steel
Architectural projects in the EU and Middle East increasingly require full material traceability and compliance documentation even for non-structural decorative elements. The 304 316L BA finish welded stainless steel square tube we supply comes with mill test certificates documenting chemical composition per GB standard, with EN/ASTM equivalence available upon request. For projects requiring third-party verification, SGS or BV inspection covers dimensional accuracy, surface finish quality, and weld integrity. [NEED_CITE: stainless steel material certification requirements for architectural projects in GCC countries] Custom lengths from 1m to 6m reduce on-site cutting waste, while bending and punching services allow direct delivery of fabrication-ready components.
Steel Grade Selection and ERW Welding Process for Decorative Tubes
The 200/300/400 series stainless steel grades — 201, 304, 316, 316L, 316Ti, 430, 439 — serve different corrosion resistance and cost requirements. 201 offers budget-friendly performance for indoor dry environments; 304 handles general atmospheric exposure; 316L with molybdenum resists chloride attack in coastal or chemical-exposed settings. Cold rolled ERW welding produces precise wall thickness with tight ±1% tolerance, and the weld seam undergoes full annealing to match base metal corrosion resistance. BA (Bright Annealed) surface treatment uses hydrogen-protected atmosphere furnaces to prevent oxidation during annealing, delivering mirror-quality reflectivity without mechanical polishing. This eliminates post-polish costs while maintaining the passive oxide layer essential for long-term corrosion performance.
Hidden Costs of Sourcing Decorative Stainless Steel Tubes from Unverified Suppliers
Material substitution — receiving 201 grade labeled as 304 — creates premature corrosion failures visible within months in humid environments. Weld seam quality issues from inadequate ERW parameters cause visible lines under polished or BA finish, triggering site rejection. Missing mill test certificates delay customs clearance and project handover, while dimensional tolerance beyond ±1% forces expensive on-site rework for railing and window frame installations. [NEED_CITE: consequences of stainless steel grade misidentification in architectural applications] Without full heat number traceability, project owners cannot verify material origin or certify compliance with specification requirements.
Why Source 304 316L BA Finish Welded Stainless Steel Square Tube from XJY Structure
Our own steel mill with 3 production lines produces cold rolled coil in 2,800+ specifications — we control material from melt to finished tube, eliminating third-party sourcing gaps. The integrated facility handles ERW welding, bright annealing, and precision cutting under one quality system, so surface finish consistency and weld integrity stay traceable to each heat number. Our engineering team reviews shop drawings and optimizes material usage before fabrication begins, reducing waste on custom sizes beyond standard 40x40mm. Complete quality documentation — WPS, PQR, dimensional reports, coating certificates — ships with every order for international project compliance. Professional packing and container loading planning protects BA surface finish during ocean transit, preventing scratches that would trigger site rejection.
Documentation & Compliance
- Mill test certificate documenting 201/304/316L chemical composition and mechanical properties per GB standard, with heat number traceability to our own steel mill production
- Third-party inspection report from SGS or BV covering dimensional accuracy, BA surface finish quality, and ERW weld integrity for 40x40mm square tubes
- Material equivalence certification mapping GB grades to EN/ASTM standards for EU and Middle East project approval
- Complete export documentation package including packing list, bill of lading, and certificate of origin for customs clearance
- Welding procedure specification (WPS) and procedure qualification record (PQR) for ERW process on stainless steel grades
Packaging, Loading & Delivery
- BA finish stainless steel square tubes bundled with protective film wrapping and edge protectors to prevent surface scratches during handling and ocean transit
- Steel strip bundling with moisture-resistant interleaving paper between layers for 6m length tubes, preserving mirror-quality surface through container loading
- Custom length cutting to 1m/2m/3m/6m with heat number stenciling on each piece for site traceability and installation sequencing
- Container loading optimization for 40x40mm square tubes maximizes payload per 20ft or 40ft container, with professional lashing to prevent shifting
- FOB/CIF/DDP shipping terms available with full export documentation and tracking until site delivery
Getting Your Quote for BA Finish Stainless Steel Square Tubes
Share your project drawings or specifications — including steel grade (201/304/316L), dimensions, surface finish requirements, and quantity — and we respond within 24 hours with pricing, mill test certificate samples, and production timeline. For custom sizes beyond standard 40x40mm or non-standard lengths, our engineering team provides fabrication feasibility review and material optimization recommendations before you commit.
Request Pricing and Material Certification
Submit your specifications to receive a detailed quote with mill test certificates and production schedule.
Contact XJY Structure
Website: www.xjystructure.com
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@xjystructure.com
Address: No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China
