Description
Factory-Direct Pricing, No Middlemen — Every 304/201 stainless steel square welded tube ships from our Jinan production lines with original mill test certificates, cutting distributor markups for global traders.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | 304/201 Stainless Steel Square Welded Tube |
| Product Type | Square Stainless Steel Welded Tube (SHS) |
| Steel Grade | 304, 201 |
| Standard | AISI, ASTM, BS, DIN, GB, JIS, EN |
| Section Shape | Square |
| Size Range | 25×25 mm – 200×200 mm (custom available) |
| Wall Thickness | 1–10 mm (custom available) |
| Length | 1000–6000 mm (custom available) |
| Technique | Cold Rolled / Hot Rolled, Welded (ERW) |
| Surface Treatment | BA / 2B / NO.1 / NO.3 / NO.4 / 8K / HL / 2D / 1D |
| Tolerance | ±1% |
| Ends | Plain / Cut |
| Application | Construction / Building / Industry / Structural frames / Machinery / Furniture / Decoration |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Construction & Building | Commercial building frames, curtain wall supports, interior structural columns |
| Machinery | Equipment frames, conveyor structures, machine base supports |
| Furniture & Decoration | Display racks, handrails, decorative architectural features, retail fixtures |
| Industrial | Platform structures, mezzanine frames, equipment enclosures |
What Surface Finish Inconsistency Costs on a Decoration Project
Mismatched NO.4 or 8K finishes across batches force on-site rework or full replacement.
When contractors receive stainless steel square tubes with visible finish variations — one batch mirror-polished, the next brushed unevenly — the entire facade or handrail system fails visual inspection. I once saw a commercial lobby project halt for three weeks because the 8K mirror finish on 100×100 mm tubes reflected light differently under the same lighting conditions. The supplier had no finish consistency records, no mill certificates linking heat numbers to surface treatment batches.
For a 304 stainless steel square tube supplier delivering to architectural projects, surface finish traceability is not optional. Without original mill test certificates documenting each batch’s processing history, buyers cannot verify whether NO.4 brushed or HL hairline finishes meet project specifications. Third-party inspection reports from SGS or BV become essential for EU and Middle East customs compliance [NEED_CITE: EN 10219 cold-formed hollow section surface quality requirements].
Matching Finish Selection to Environmental Exposure
The 304 stainless steel square tube supplier must guide buyers through finish selection based on installation environment. For coastal or high-humidity regions, 304 grade with BA or 2B finish provides superior corrosion resistance compared to 201, which suits indoor decorative applications where budget constraints dominate. The 8+ surface finish options — from industrial 2D to decorative 8K mirror — require clear specification at inquiry stage to avoid substitution disputes during delivery.
Structural Compliance and Certification Requirements
Engineering applications demand compliance with EN 10219 for cold-formed welded hollow sections or ASTM A500 for structural tubing. Our 304 and 201 stainless steel square welded tubes carry ISO 9001:2015 certification, with Lloyd’s CE marking available for EN 10210/10219 compliance. For Southeast Asian and African projects, third-party SGS or BV inspection confirms dimensional tolerance (±1%) and steel grade conformity before shipment, preventing customs delays at destination ports [NEED_CITE: steel grade equivalence between AISI 304 and EN 1.4301 standards].
Understanding 304 vs 201 Stainless Steel for Project Environments
The 304 grade contains 18% chromium and 8% nickel, providing corrosion resistance suitable for outdoor structural frames, coastal installations, and food processing facilities. The 201 grade substitutes manganese and nitrogen for partial nickel content, reducing cost while maintaining acceptable corrosion resistance for indoor furniture, retail displays, and dry environment machinery frames. Both grades undergo ERW welding with cold rolled or hot rolled processing, achieving ±1% dimensional tolerance across 25×25 mm to 200×200 mm size ranges.
Surface finish selection directly impacts both aesthetics and maintenance requirements. The NO.4 brushed finish hides fingerprints and minor scratches in high-traffic areas, while 8K mirror polish demands regular cleaning but delivers premium visual impact for luxury retail or hospitality projects. BA (bright annealed) finish provides reflective quality without additional polishing costs, suitable for elevator interiors and decorative columns.
Hidden Costs of Unverified Material Certification
Purchasing stainless steel square tubes without original mill test certificates creates downstream risks: customs rejection due to missing chemical composition documentation, structural inspection failure when actual nickel content falls below 304 specifications, or project delays when wall thickness tolerance exceeds ±1% and connection details fail. A 304 stainless steel square tube supplier providing heat-number traceability and third-party inspection reports eliminates these risks, ensuring every batch meets AISI/ASTM/EN standard requirements [NEED_CITE: importance of mill test certificates for stainless steel import compliance].
Why Global Traders Choose Our Production Lines
Our Jinan facility operates three production lines simultaneously, manufacturing 20,000+ tons monthly across 2,800+ specifications. Factory-direct pricing eliminates distributor markups, with volume discount programs for long-term partners ordering 304 and 201 stainless steel square welded tubes in bulk. Every shipment includes original mill test certificates documenting chemical composition and mechanical properties, with SGS or BV third-party inspection available upon request.
We maintain large ready stock for standard sizes (25×25 mm to 200×200 mm, 1–10 mm wall thickness), enabling urgent orders and split shipments. Custom non-standard sizes and cut-to-length services accommodate project-specific requirements, with typical production lead times of 15–25 days for non-stock items. Professional export documentation — including CE certificates, packing lists, bills of lading, and certificates of origin — ensures smooth customs clearance across 50+ countries.
Documentation & Compliance
- Mill test certificate documenting 304/201 chemical composition (Cr, Ni, Mn content) and mechanical properties per AISI/ASTM standards
- CE certificate (EN 10210/EN 10219) for European market structural compliance
- ISO 9001:2015 quality management system certificate covering production processes
- SGS or BV third-party inspection report verifying dimensional tolerance and surface finish quality
- Material traceability by heat number linking each batch to original mill test documentation
- Complete customs documents: packing list, bill of lading, certificate of origin, commercial invoice
Packaging, Loading & Delivery
- Stainless steel square tubes bundled with steel strips and edge protectors to preserve BA/2B/NO.4 surface finishes during ocean transit
- Seaworthy packaging with waterproof paper wrapping for 201 grade tubes destined for high-humidity regions
- Container loading optimization for 6-meter length tubes, maximizing 20ft and 40ft GP capacity with professional lashing
- Cut-to-length service available for 1000–6000 mm requirements, reducing on-site waste and handling costs
- Heat number and steel grade (304/201) marked on each bundle for site identification and traceability
- FOB/CIF/DDP shipping terms with door-to-door logistics coordination for project sites
Submit Specifications for Bulk Quotation
Provide your required sizes (25×25 mm to 200×200 mm), wall thickness (1–10 mm), steel grade (304 or 201), surface finish preference, and destination port. We respond within 12 hours with competitive factory-direct pricing, volume discounts, delivery schedule, and available mill test certificate samples. For custom non-standard sizes or third-party inspection requirements, our engineering team provides technical solutions and compliance documentation.
Frequently Asked Questions
Q: What is the difference between 304 and 201 stainless steel square tubes for outdoor applications?
A: 304 stainless steel contains higher chromium (18%) and nickel (8%) content, providing superior corrosion resistance for outdoor structural frames, coastal installations, and high-humidity environments. 201 stainless steel uses manganese and nitrogen to partially replace nickel, offering cost savings for indoor furniture, retail displays, and dry environment applications. For a 304 stainless steel square tube supplier, grade selection depends on project environmental exposure and budget requirements.
Q: Can you provide custom sizes outside the standard 25×25 mm to 200×200 mm range?
A: Yes, we manufacture custom non-standard sizes with ±1% dimensional tolerance. Our three production lines handle special requirements for side lengths and wall thickness beyond standard catalog items. MOQ remains flexible from 1 ton for trial orders to full-container bulk shipments, with typical production lead times of 15–25 days for custom specifications.
Q: What surface finish options are available for decorative applications?
A: We offer 8+ surface finishes including BA (bright annealed), 2B (cold rolled), NO.1 (hot rolled), NO.3 (coarse brushed), NO.4 (fine brushed), 8K (mirror polished), HL (hairline), and 2D/1D (industrial). Each finish serves specific aesthetic and functional requirements — NO.4 hides fingerprints in high-traffic areas, 8K delivers premium visual impact for luxury projects, BA provides reflective quality without additional polishing costs.
Q: Do you provide mill test certificates and third-party inspection for customs clearance?
A: Every batch ships with original mill test certificates documenting chemical composition and mechanical properties per AISI/ASTM/EN standards. Third-party inspection from SGS or BV is available upon request, verifying dimensional tolerance, surface finish quality, and steel grade conformity. Complete customs documentation — including CE certificates, packing lists, bills of lading, and certificates of origin — ensures smooth clearance across 50+ countries.
Q: What is your MOQ and do you support split shipments?
A: Our MOQ starts from 1 ton for trial orders, supporting small project requirements and sample verification. We maintain large ready stock for standard sizes (25×25 mm to 200×200 mm, 1–10 mm wall thickness), enabling urgent orders and split shipments across multiple containers. Volume discount programs apply for long-term partners with recurring procurement needs above $500K annually.
Request Your 304/201 Stainless Steel Square Tube Quotation
Send your specifications — sizes, wall thickness, steel grade, surface finish, quantity, and destination port — to receive factory-direct pricing with volume discounts within 12 hours.
Email: admin@sdxinjiyuan.com
WhatsApp: +86 188 5315 7756
Website: www.sdxinjiyuan.com
