201 / 304 Stainless Steel Seamless Square Tube
Seamless Strength. Dual Material Choice. Engineered for Performance.
🔲 No Weld Seam. Maximum Integrity. Choose: Cost-Effective 201 or Premium 304.
Introducing 201 / 304 Stainless Steel Seamless Square Tubes —
precision-engineered seamless structural profiles designed for high-pressure, high-strength, and critical applications where uniformity, durability, and reliability are non-negotiable.
Unlike welded tubes, our seamless square tubes are formed in a single extrusion process — eliminating weak points along the weld line. This results in:
- ✅ Higher burst pressure resistance
- ✅ Superior structural integrity
- ✅ Uniform wall thickness & dimensional accuracy
- ✅ Ideal for load-bearing, hydraulic, and precision machinery use
Available in SUS201 (economical) or SUS304 (premium corrosion resistance), these tubes offer the perfect balance of performance, cost, and longevity for industrial, mechanical, and architectural projects worldwide.
✅ Why Choose Our 201/304 Seamless Square Tubes?
1. True Seamless Construction – No Weak Points
- Manufactured via hot extrusion + cold drawing – no weld seam
- No risk of weld cracking, leakage, or uneven stress distribution
- Perfect for high-pressure systems, structural frames, and dynamic loads
- Smooth internal surface – ideal for fluid/gas transport or cable routing
2. Dual Material Options – Optimize Cost & Performance
| Grade | Best For | Corrosion Resistance | Cost Efficiency |
|---|---|---|---|
| SUS201 | Indoor industrial use, dry environments, cost-sensitive projects | Moderate | ✅✅✅ (Most Economical) |
| SUS304 | Outdoor exposure, humid conditions, food/pharma equipment | High | ✅✅ (Premium Durability) |
💡 Choose 201 for budget-friendly structural needs. Choose 304 for long-term corrosion resistance and broader application range.
3. Precision Dimensions & Tight Tolerances
- Size Range: 10×10mm – 100×100mm (outer dimensions)
- Wall Thickness: 1.0mm – 6.0mm
- Length: 1m, 2m, 3m, 4m, 5.8m, 6m (custom cut-to-length available)
- Tolerance:
- Dimension: ±0.1mm
- Wall Thickness: ±0.08mm
- Straightness: < 0.5mm/m
- Process: Hot Extruded → Cold Drawn (CD) for enhanced strength and finish
4. Available Surface Finishes
- Pickled & Annealed (2B) – standard industrial finish, smooth and clean
- Bright Annealed (BA) – reflective, low roughness, used in precision equipment
- Polished (Mirror 8K or Hairline HL) – decorative-grade finish for visible applications
- Oiled or Dry – anti-rust protection options
5. Rigorous Quality Control & Certifications
- Standard Compliance: ASTM A554, ASTM A312, JIS G3463, ISO 1127
- Testing Included:
- Eddy Current Testing (ECT)
- Hydrostatic Test (optional)
- Tensile Test
- Flattening Test
- Intergranular Corrosion Test (for 304)
- Certifications: ISO 9001, SGS, RoHS
- MTR (Mill Test Report) provided with every batch
- Packaging: Anti-rust paper + plastic film + steel-banded wooden pallet (export-safe)
🏭 Premium Applications
| Industry | Use Cases |
|---|---|
| Industrial Machinery | Machine frames, robotic arms, linear guides, jigs & fixtures |
| Hydraulic & Pneumatic Systems | Fluid conveyance, cylinder components, high-pressure lines |
| Automotive & Transportation | Chassis parts, roll cages, interior support structures |
| Construction & Architecture | Load-bearing columns, structural supports, seismic bracing |
| Energy & Utilities | Solar mounting systems, battery enclosures, pump frames |
| Food & Pharma Equipment | Processing racks, conveyor frames, hygienic structures (304 only) |
🔧 Product Specifications
| Parameter | Details |
|---|---|
| Material | SUS201 or SUS304 (1.4301 / 06Cr19Ni10) |
| Shape | Square Tube – Seamless |
| Outer Size (mm) | 10×10 – 100×100 |
| Wall Thickness | 1.0mm – 6.0mm |
| Length | 1m, 2m, 3m, 4m, 5.8m, 6m (custom) |
| Process | Seamless (Hot Extruded + Cold Drawn) |
| Surface Finish | 2B (Pickled), BA (Bright), 8K Mirror, Hairline HL |
| Tolerance | ±0.1mm (size), ±0.08mm (wall) |
| Standards | ASTM A312, ASTM A554, JIS G3463, ISO 1127 |
| Optional | MTR, hydro test, laser marking, OEM packaging |
💬 Customer Feedback
“We switched from welded to seamless 304 square tubes for our machine frames — zero failures after 18 months. Worth the investment.”
— Robert, Mechanical Engineer, Germany
“Used SUS201 seamless tubes for indoor equipment. Strong, straight, and 20% cheaper than 304. Perfect for our budget.”
— Anita, Procurement Lead, India
📞 Request a Free Sample & Quote Today!
✅ Tell us your size, material, and finish – we’ll provide a fast, accurate quote
✅ Free sample (100–200mm) for quality & fit testing
✅ Low MOQ: 50 pcs per size (negotiable for trial orders)
✅ OEM/ODM supported – private label, custom lengths, logo engraving
👉 Contact Us Now or Email: sales@xlhsteel.com
📞 +86 133 6030 1537 | 🌐 www.xlhsteel.com
🌐 Why Choose Our 201/304 Seamless Square Tubes?
- ✅ No Weld Seam = Higher Strength & Reliability
- ✅ Dual Material Choice – Save with 201 or Upgrade to 304
- ✅ Precision Tolerances – Ideal for Engineering & Machinery
- ✅ Global Standards Compliant – Trusted Quality Worldwide
Strength without compromise. Precision without seams.
