Description
Factory-Direct Supply, No Middlemen — As a vertically integrated manufacturer with our own steel production lines, we eliminate trader markups and ensure full material traceability from raw coil to finished 304 316L stainless steel square rectangular tube supplier products.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | 304/316L/201 BA Surface ERW Welded Stainless Steel Square/Rectangular Tube |
| Product Type | Welded Stainless Steel Square/Rectangular Tube |
| Steel Grade | 201, 304, 316, 316L, 316Ti, 430, 439 |
| Standard | GB |
| Section Shape | Square, Rectangular |
| Size Range | 10mm×20mm – 100mm×200mm |
| Wall Thickness | 0.8mm – 5.0mm |
| Length | 1m, 2m, 3m, 6m |
| Technique | ERW (Electric Resistance Welded) |
| Surface Treatment | BA (Bright Annealed), Mirror Polish, Brushed, Satin, Matt |
| Tolerance | ±1% |
| Ends | Plain End |
| Application | Architectural decoration, stair handrails, balcony balustrades, window frames, door frames, kitchen equipment, display racks, furniture frames, railings, structural framing |
| MOQ | Negotiable |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Architectural & Decoration | Stair handrails, balcony balustrades, window frames, door frames, furniture frames |
| Commercial & Retail | Kitchen equipment, display racks, shop fittings, interior structural framing |
| Construction & Infrastructure | Railings, balcony systems, structural supports for warehouses and commercial buildings |
| Industrial Facilities | Equipment frames, conveyor supports, platform handrails in food processing and pharmaceutical plants |
Why BA Surface Finish Matters for Architectural Stainless Steel Tubes
BA (Bright Annealed) finish delivers uniform reflectivity and corrosion resistance without secondary polishing — critical for visible architectural applications where appearance and durability intersect.
When sourcing 304 316L stainless steel square rectangular tube supplier products for handrails or balustrades, buyers often discover surface inconsistencies after arrival — roll marks, micro-scratches, or uneven gloss that compromise the aesthetic intent. These defects typically stem from inadequate annealing atmosphere control or poor handling during transit. For projects in coastal or high-humidity environments, surface integrity directly affects long-term corrosion performance. [NEED_CITE: BA finish metallurgical benefits for stainless steel architectural applications]
Matching Stainless Steel Tubes to Architectural and Structural Requirements
The 304 316L stainless steel square rectangular tube supplier range covers interior decoration to outdoor marine environments through strategic grade selection. 201 grade suits dry indoor applications like furniture frames and display racks where cost efficiency matters. 304 provides reliable corrosion resistance for stair handrails and balcony balustrades in moderate climates. 316L and 316Ti become essential for coastal projects or chemical plant handrails where chloride exposure demands superior pitting resistance. The BA surface eliminates post-fabrication polishing while maintaining consistent reflectivity across long runs — important for continuous handrail installations where visual uniformity matters.
Engineering Compliance and Certification for International Projects
Architectural stainless steel tubes must meet both aesthetic expectations and structural performance requirements. For EU projects, EN 10219 cold-formed hollow section standards govern dimensional tolerances and material certification. North American specifications often reference ASTM A550 for structural tubing. The ±1% tolerance on our 304 316L stainless steel square rectangular tube supplier products ensures precise fit-up during assembly, reducing on-site adjustment time. Third-party inspection by SGS or BV validates chemical composition and mechanical properties per heat number — essential documentation for customs clearance and project handover. [NEED_CITE: EN 10219 dimensional tolerance requirements for structural hollow sections]
Understanding ERW Welding and Stainless Steel Grade Selection
ERW (Electric Resistance Welding) creates a longitudinal weld seam through resistance heating without filler material — ideal for stainless steel square and rectangular tubes where weld integrity affects both strength and appearance. The BA (Bright Annealed) surface treatment involves annealing in a controlled hydrogen atmosphere, preventing oxidation and preserving the mill finish without additional grinding or polishing. Grade selection follows corrosion environment: 201 for budget-conscious interior applications, 304 for general architectural use, 316L for marine or chemical exposure. The low-carbon 316L variant prevents chromium carbide precipitation during welding, maintaining corrosion resistance at the weld zone. Wall thickness from 0.8mm to 5.0mm covers lightweight decorative framing to structural load-bearing applications. [NEED_CITE: ERW welding process advantages for stainless steel tubing]
Hidden Costs of Incorrect Stainless Steel Tube Procurement
Choosing the wrong grade or accepting substandard surface finish creates cascading project costs. 201 grade substituted for 304 in coastal handrails leads to premature rust staining and client complaints. BA finish with roll marks or scratches requires on-site re-grinding — labor-intensive work that delays project completion and often fails to match original reflectivity. Material certificates missing heat number traceability trigger inspection failures and customs holds. Negative tolerance abuse reduces actual wall thickness below design specifications, creating structural safety concerns during load testing. [NEED_CITE: stainless steel grade equivalence and substitution risks]
Why Source Stainless Steel Tubes from Our Vertically Integrated Mill
Our 304 316L stainless steel square rectangular tube supplier capability stems from controlling the entire production chain — from raw material melting to finished fabricated components. The in-house理化实验室 issues Mill Test Certificates documenting chemical composition and mechanical properties for every heat number. With 2,800+ specifications in inventory, we fulfill mixed-size orders without minimum quantity penalties. Certified welding procedures (WPS/PQR) and qualified welders ensure fabrication quality meets AWS and EN 1090 standards. Professional packing with interleaving paper protects BA surfaces during ocean transit, while complete export documentation packages streamline customs clearance across EU, Middle East, and African markets.
Documentation & Compliance
- Mill Test Certificate documenting 304/316L chemical composition (C, Cr, Ni, Mo content) and mechanical properties per GB standard, traceable by heat number
- SGS or BV third-party inspection report validating dimensional accuracy, surface finish quality, and weld integrity for 304 316L stainless steel square rectangular tube supplier shipments
- Material traceability records linking finished tubes to raw material heat numbers, supporting project quality audits and customs documentation
- CE marking documentation for EU projects requiring EN 10219 compliance verification
- Complete export package including commercial invoice, packing list, bill of lading, and certificate of origin
- Welding procedure specifications (WPS) and procedure qualification records (PQR) for custom fabrication orders
Packaging, Loading & Delivery
- BA finish 304 316L stainless steel square rectangular tube supplier products packed with interleaving paper between layers to prevent surface scratching during transit
- Steel strip bundling with edge protectors preserves dimensional accuracy and prevents bundle deformation in 6m length shipments
- Surface protection through plastic film wrapping for mirror polish and brushed finish tubes, preventing fingerprint marks and contamination
- Container loading optimization for 10mm×20mm to 100mm×200mm size range, maximizing 20ft and 40ft container capacity through nested stacking
- Heat number and grade identification marked on each bundle end, supporting site verification and material traceability
- FOB Qingdao port with CIF and DDP options available, door-to-door logistics to EU, Middle East, and African project sites
Initiating Your Stainless Steel Tube Procurement
Submit project drawings or specifications detailing steel grade (201/304/316L), section dimensions, wall thickness, length requirements, and surface finish preference. We respond within 24 hours with preliminary pricing, Mill Test Certificate samples, and production lead time confirmation. For custom fabrication including bending, cutting, or punching, share detailed shop drawings for engineering review and fabrication sequencing.
Request Quotation and Material Certification
Send your 304 316L stainless steel square rectangular tube supplier inquiry with specifications and quantity to receive pricing, Mill Test Certificate documentation, and delivery schedule.
Contact: admin@xjystructure.com | WhatsApp: +86 188 5315 7756
Frequently Asked Questions
Q: What is the difference between 201, 304, and 316L stainless steel tubes for architectural applications?
A: 201 offers cost efficiency for dry indoor applications like furniture frames and interior display racks. 304 provides reliable corrosion resistance for stair handrails, balcony balustrades, and window frames in moderate environments. 316L contains molybdenum for superior chloride resistance, essential for coastal projects, chemical plant handrails, and marine environments where pitting corrosion is a concern.
Q: Can you provide custom cutting, bending, and punching to my drawing specifications?
A: Yes, our in-house processing services include CNC cutting, bending, punching, and welding per your shop drawings. We review drawings for fabrication feasibility, provide material optimization recommendations, and deliver finished components ready for installation — eliminating secondary fabrication costs and reducing project lead time.
Q: What surface finishes are available and how do BA, mirror, and brushed differ?
A: BA (Bright Annealed) provides uniform reflectivity through controlled atmosphere annealing without secondary polishing. Mirror polish achieves maximum reflectivity through progressive grinding and buffing. Brushed and satin finishes offer directional grain patterns that hide fingerprints and minor scratches. Matt finish provides low-reflection appearance for industrial applications.
Q: Do you provide Mill Test Certificates and third-party inspection reports for international projects?
A: Every shipment includes Mill Test Certificates documenting chemical composition and mechanical properties traceable by heat number. SGS or BV third-party inspection is available upon request, validating dimensional accuracy, surface quality, and weld integrity — essential for EU, Middle East, and African project compliance requirements.
Q: What is the production lead time and how do you handle export packing for long-distance shipping?
A: Typical production lead times depend on order quantity and customization requirements. BA finish tubes are packed with interleaving paper between layers to prevent surface damage. Steel strip bundling with edge protectors maintains dimensional accuracy. Container loading is optimized for the 10mm×20mm to 100×200mm size range, maximizing container capacity through nested stacking arrangements.
