Description
Factory-direct pricing, no middlemen — every 304 316L stainless steel square rectangular welded tube ships straight from our Jinan mill with original mill test certificates and full chemical traceability.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | 304 / 316L Stainless Steel Square and Rectangular Welded Steel Tube |
| Product Type | ERW Welded Square and Rectangular Steel Tube (Stainless Steel) |
| Steel Grade | 201, 301, 304, 305, 309S, 316, 316L, 316Ti, 410, 430, 439, 441 |
| Standard | ASTM A554, GB |
| Section Shape | Square / Rectangular / Round / Oval |
| Size Range | Customizable outer dimensions across square, rectangular, round, and oval profiles |
| Wall Thickness | 0.3–2.0 mm |
| Length | 5.8 m / 6.0 m / 6.1 m or customized up to 12 m |
| Technique | ERW (Electric Resistance Welded) |
| Surface Treatment | 2B / BA / NO.3 / NO.4 / HL / 6K / 8K (Mirror) |
| Tolerance | Outer Diameter ±0.2 mm / Thickness ±0.03 mm / Length ±10 mm |
| Ends | Plain |
| Application | Decorations / Handrails / Railings / Window / Balcony / Curtain Wall / Furniture / Construction Structure |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Architectural & Construction | Elevator interior frames, building entrance handrails, curtain wall support structures, balcony railing systems |
| Interior Decoration | Furniture frames, display shelving, brushed or mirror-finish wall panels, stair balustrades |
| Commercial Facades | NO.4 / HL finish square tubes for exterior cladding, 8K mirror rectangular tubes for lobby features |
| Industrial Fabrication | Conveyor frames, equipment enclosures, corrosion-resistant structural supports in humid environments |
Surface Finish Tolerance Decides Whether a Facade Project Passes Inspection
A 0.03 mm thickness deviation on a 304 decorative tube can reject an entire elevator cab order.
Architectural buyers sourcing 304 316L stainless steel square rectangular welded tube for visible applications — handrails, curtain walls, elevator interiors — rarely fail on steel grade chemistry. They fail on surface consistency and dimensional tolerance. A batch of 201 tubes with uneven NO.4 brushing, or 304 rectangular hollow sections exceeding ±0.03 mm wall tolerance, gets rejected on site because color matching breaks across panels or welding gaps open up. Fragmented sourcing from multiple traders makes this worse: each supplier runs different rolling schedules, different polishing lines, different annealing batches. [NEED_CITE: surface finish consistency requirements for architectural stainless steel applications]
Matching Finish and Grade to Visible Structural Applications
When a 304 316L stainless steel square rectangular welded tube goes into a coastal hotel handrail or a chemical plant walkway, the surface finish and grade must align with both aesthetics and corrosion exposure. 316L with a 6K or 8K mirror finish handles chloride-rich air without tea-staining, while 201 with NO.4 satin works for indoor mall railings where budget matters more than salt resistance. Our mill runs dedicated polishing lines for each finish grade — meaning a single order of mixed 304 and 316L tubes arrives with consistent grain direction and no cross-contamination between molybdenum-bearing and non-molybdenum grades.
Engineering Compliance and Certification for Stainless Hollow Sections
Stainless welded tubes in architectural and structural roles must satisfy both material standards and regional building codes. ASTM A554 governs mechanical welding quality for ornamental and light structural stainless tubing, while European facade projects often require CE marking under EN 10219 for cold-formed welded hollow sections. The 304 316L stainless steel square rectangular welded tube we produce carries full mill test certificates traceable by heat number, and third-party inspection from SGS or BV is available before container sealing. For EU-bound shipments, CE EN 10210 / EN 10219 documentation prevents customs holds at Rotterdam or Hamburg. [NEED_CITE: EN 10219 cold-formed welded structural hollow sections compliance]
Steel Grade Selection and ERW Welding for Stainless Tubes
The jump from 201 to 304 to 316L in stainless square and rectangular tubes is not just about price — it reflects chromium-nickel-molybdenum ratios that determine pitting resistance and weldability. 201 substitutes manganese and nitrogen for part of the nickel content, reducing cost but limiting chloride resistance. 304 offers balanced formability and corrosion protection for most indoor and mild outdoor applications. 316L adds molybdenum and lowers carbon, preventing sensitization along the ERW weld seam during subsequent bending or welding by the fabricator. The ERW process itself produces a clean, narrow weld bead suitable for thin-wall tubes (0.3–2.0 mm), and our in-house physical and chemical lab verifies every heat against ASTM A554 requirements before the tube reaches the polishing line. Tight outer diameter tolerance of ±0.2 mm ensures that 304 316L stainless steel square rectangular welded tube fits standard connector hardware without reaming. [NEED_CITE: metallurgical differences between 201 304 316L stainless steel grades]
Hidden Costs When Stainless Tube Tolerance or Certification Falls Short
Ordering 304 316L stainless steel square rectangular welded tube without verified mill test certificates or with loose thickness tolerance creates costs that surface only at installation. Material substitution — 201 shipped as 304 — triggers rejection during spectrometer testing on site, delaying the project weeks while replacement tubes are air-freighted. Thickness outside ±0.03 mm forces fabricators to re-machine connector joints or reject entire batches for visible facade work. Missing CE documentation for European projects means containers sit at port under customs hold until retroactive testing is arranged — often at three times the original inspection cost. [NEED_CITE: consequences of missing mill test certificates in steel procurement]
Procurement Confidence Backed by Mill-Level Control
Every 304 316L stainless steel square rectangular welded tube leaving our Jinan facility passes through an in-house physical and chemical laboratory that tests composition, tensile behavior, and weld seam integrity against ASTM A554 before release. We hold 41 invention patents including proprietary sharp-corner rectangular tube technology, and our three dedicated production lines cover over 2,800 specifications — so non-standard oval profiles or extra-long 12 m lengths do not require brokering through a trader. Full international certification (CE EN 10210/10219, ISO 9001:2015, Singapore FPC, SGS and BV verification) ships with every container, and our export team has handled door-to-door logistics to 50+ countries for nearly two decades. Custom surface finishes from 2B through 8K mirror, plus proprietary sharp-corner profiles that eliminate gap issues at welded joints, are available on request with typical production lead times.
Documentation & Compliance
- Mill test certificate documenting 304 / 316L chemical composition (Cr, Ni, Mo content) and weld seam integrity per ASTM A554
- CE certificate under EN 10210 / EN 10219 for European structural and facade project compliance
- ISO 9001:2015 quality management certificate covering full production and inspection workflow
- SGS or BV third-party inspection report available upon request before container sealing
- Full material traceability by heat number linking each tube bundle to its original melt and rolling batch
- Export customs documents including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- 304 / 316L tubes bundled with soft-edge protectors and waterproof wrapping to preserve NO.4 / HL / 8K surface finishes during ocean transit
- Steel strip bundling sized to match 5.8 m / 6.0 m / 6.1 m standard lengths, with custom crating available for 12 m non-standard cuts
- Container loading plans optimized for thin-wall stainless rectangular tubes (0.3–2.0 mm) to prevent nesting deformation under maritime vibration
- Heat number and steel grade (e.g., 316L) stenciled on each bundle tag for on-site traceability verification
- FOB / CIF / DDP shipping options with professional lashing and container weight distribution for heavy stainless tube orders
- Door-to-door logistics coordination to 50+ countries including EU, North America, Southeast Asia, and Middle East ports
Start Your Stainless Tube Procurement With Verified Specifications
Submit your required steel grade (201 / 304 / 316L), section dimensions, wall thickness, surface finish, and destination port — we respond within 12 hours with unit pricing, applicable certifications, and typical production lead times. Non-standard oval profiles, sharp-corner rectangular tubes, and custom lengths up to 12 m are quoted against your drawing. Request original mill test certificates and SGS / BV inspection reports before committing to production.
Get Your 304 316L Stainless Steel Square Rectangular Welded Tube Quote
Send your specifications, quantity, and destination to receive factory-direct pricing with full material traceability and certification documentation.
Company: Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.sdxjysteel.com
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@sdxjysteel.com
Address: No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China
