Description
Factory-Direct ERW Welded Tubes — Every 304 stainless steel rectangular tube ships with original mill test certificates and supports SGS/BV third-party inspection before container sealing.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | 304 Stainless Steel Welded Rectangular Tube |
| Product Type | Welded Square and Rectangular Steel Tube (Stainless Steel) |
| 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 |
| Application | Architectural decorations, stair handrails, balcony balustrades, window frames, door frames, kitchen equipment, display racks, furniture frames, railings, architectural trim |
| Invoicing | By Theoretical Weight |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Architectural & Construction | Stair handrails, balcony balustrades, window and door frames, architectural trim |
| Commercial Interiors | Kitchen equipment, display racks, furniture frames |
| Decorative Fabrication | Railings, light structural supports, interior cladding frames |
Surface Finish Selection Determines Whether Your Handrail Survives a Coastal Job Site
BA finish looks flawless out of the mill — but salt air exposure reveals whether the passive layer was properly formed.
Decorative stainless tubes arrive at project sites across Southeast Asia and West Africa where humidity and chloride levels far exceed indoor showroom conditions. Buyers who specify mirror polish for exterior balustrades without understanding the corrosion hierarchy between BA, brushed, and mill finishes often receive complaints within months. The surface you choose must match the installation environment, not just the rendering. A 304 stainless steel rectangular tube with BA surface works perfectly for indoor furniture frames, but the same profile in a coastal railing system may demand 316L with a brushed or satin finish to resist pitting corrosion over the design life.
Matching Finish and Grade to Decorative Structural Environments
Architectural projects demand both visual consistency and long-term corrosion performance. When specifying a 304 stainless steel rectangular tube for stair handrails in a shopping mall, BA finish provides uniform reflectivity across hundreds of meters of railing. For outdoor balcony balustrades in tropical climates, switching to 316L with a brushed surface reduces fingerprint visibility while maintaining chloride resistance. The ERW welding process with ±1% tolerance ensures that mating joints between tube sections remain tight, which matters when weld seams are visible in finished assemblies.
Engineering Compliance and Certification Requirements
Decorative stainless tubes used in public buildings must meet both aesthetic standards and structural codes. Load-bearing handrail systems in commercial projects typically require compliance with local building codes that reference material traceability and mechanical properties [NEED_CITE: EN 10219 cold-formed welded structural hollow sections]. The GB standard governs production, but international projects often require cross-referencing to EN or ASTM equivalents for engineer approval. Every batch of 304 stainless steel rectangular tube ships with original mill test certificates documenting chemical composition, and SGS or BV third-party inspection is available for projects requiring independent verification before shipment.
Steel Grade Selection and ERW Welding Fundamentals
The 200, 300, and 400 series stainless grades serve distinctly different environments. 201 offers cost savings in dry indoor applications where corrosion demands are minimal. 304 remains the workhorse grade for general architectural use with moderate corrosion resistance. 316L and 316Ti add molybdenum for chloride resistance in coastal or chemical-exposed installations, while 430 and 439 provide ferritic alternatives for indoor decorative work where magnetic properties are acceptable. ERW welding produces a controlled heat-affected zone along the seam, and the subsequent bright annealing process restores the corrosion resistance of the weld area to match the parent material — this is why BA-finished tubes from a reputable mill outperform mirror-polished tubes from uncontrolled sources in long-term exposure tests [NEED_CITE: effect of bright annealing on weld zone corrosion resistance in stainless ERW tubes].
The ±1% tolerance on wall thickness, combined with theoretical weight invoicing, gives buyers cost predictability. Negative tolerance beyond this range would reduce actual load capacity while the invoice weight remains unchanged — a hidden cost that surfaces only during structural verification.
Hidden Costs of Specifying the Wrong Finish or Grade
Ordering 201 tubes for a coastal hotel balustrade project because the unit price is lower seems rational until rust staining appears on the facade within one rainy season. Replacing installed tubes costs multiples of the original material savings. Similarly, accepting tubes without mill test certificates may pass initial visual inspection but fails during project handover when the consultant engineer requests material documentation. Customs authorities in multiple import markets now routinely hold stainless steel shipments lacking proper certification [NEED_CITE: customs documentation requirements for stainless steel imports in developing markets]. The delay, demurrage charges, and reshipment costs dwarf any per-ton savings from an uncertified source.
Why Buyers Choose Xin Jiyuan for Decorative Stainless Tubes
Our three production lines run simultaneously, producing over 20,000 tons monthly across all major steel product categories. The 2,800+ specifications in ready stock mean that standard sizes of 304 stainless steel rectangular tube ship within days, not weeks. Every order includes original mill test certificates — not photocopies, not templates, but actual batch-specific documents tied to heat numbers. For buyers consolidating multiple product categories into one container, we handle mixed loading of tubes, plates, and sections with optimized stowage plans that maximize container utilization. ISO 9001:2015 certification and Lloyd’s CE marking for applicable products provide the documentation backbone that import wholesalers and project buyers need for repeat orders across 50+ countries.
Documentation & Compliance
- Mill test certificate documenting 304 stainless steel chemical composition (C, Cr, Ni, Mn content) and mechanical properties per GB standard for each heat number
- CE certificate per EN 10219 for cold-formed welded structural hollow sections where applicable to project specifications
- ISO 9001:2015 quality management system certificate covering the full production and inspection process
- SGS or BV third-party inspection report available on request for pre-shipment quality verification and container loading supervision
- Material traceability by heat number linking each bundle to its original mill test certificate
- Complete customs documentation package including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- BA-finished and mirror-polished 304 stainless steel rectangular tubes wrapped in protective film and bundled with steel strips, separated by soft edge protectors to prevent surface scratching during ocean transit
- Brushed and satin finish tubes packed in seaworthy bundles with interlayer paper to maintain surface consistency across the full order quantity
- Container loading optimized for 6m and 3m lengths with nested rectangular profiles to maximize cubic utilization, supporting mixed-product consolidated shipments
- Custom cutting to 1m, 2m, or 3m lengths available per drawing, with cut ends deburred and protected
- Heat number and steel grade marked on each bundle tag for site identification and traceability verification
- FOB, CIF, and DDP shipping terms available with professional export documentation handling
Ready to Move Forward on Your Stainless Tube Order
Submit your specification list — section size, wall thickness, steel grade, surface finish, quantity, and destination port — and receive a competitive bulk quotation with mill test certificate commitment within 12 hours. For non-standard sizes or custom processing including bending, punching, and cutting, share your drawings for a tailored production plan.
Contact Xin Jiyuan for Pricing and Mill Test Certificates
Send your inquiry to admin@sdxinjiyuan.com or reach us on WhatsApp at +86 188 5315 7756.
Frequently Asked Questions
Q: What is the difference between 201, 304, and 316L stainless steel for square and rectangular tubes?
A: 201 is a cost-effective grade suitable for dry indoor decorative applications. 304 provides general-purpose corrosion resistance for most architectural and commercial interior projects. 316L contains molybdenum for enhanced resistance to chloride-induced pitting, making it the correct choice for coastal, marine, or chemical-exposed environments.
Q: Can you provide custom cutting, bending, and punching to drawing specifications?
A: Yes. We support bending, welding, decoiling, punching, and cutting services for 304 stainless steel rectangular tubes. Share your drawings or dimensional requirements, and our production team will confirm feasibility and include processing costs in the quotation.
Q: What surface finishes are available, and how do BA, mirror, and brushed finishes differ in corrosion resistance?
A: We offer BA (Bright Annealed), mirror polish, brushed, satin, and matt finishes. BA provides a uniform reflective surface with full passive layer integrity from the annealing process. Mirror polish offers the highest visual reflectivity but requires proper passivation after polishing to maintain corrosion resistance. Brushed and satin finishes hide fingerprints and minor surface imperfections, making them practical for high-touch architectural applications.
Q: Do you supply mill test certificates and support third-party inspection for customs and project compliance?
A: Every batch ships with original mill test certificates documenting chemical composition and mechanical properties. SGS and BV third-party inspection is available on request for pre-shipment verification, covering dimensional checks, surface quality, and material composition analysis.
Q: What is the MOQ, and can you support split shipments and consolidated container loading?
A: We accept trial orders from 1 ton and support full-container bulk orders. For buyers purchasing multiple product categories, we provide consolidated container loading with optimized stowage plans to maximize utilization and reduce per-unit freight costs.
