China Stainless Steel
stainless steel
square pipe & tube
TeCarve’s Stainless Steel Square Pipe & Tube is engineered for structural strength, aesthetic appeal, and long-term durability across architectural and industrial applications.
Made from high-grade stainless steel such as 304, 316, and 201, our square tubes feature excellent corrosion resistance, uniform wall thickness, and precise dimensional tolerances. These tubes are ideal for construction frameworks, handrails, support columns, and furniture components.
With options in seamless or welded forms, and available in a range of surface finishes like mirror, satin, and brushed, they offer both function and visual elegance for interior and exterior use.
Customized sizing and cutting services are available to meet specific project needs.
Specifications
Available Sizes by Standard
Markets: N. America — welded mechanical/structural/ornamental square tube
| Size (mm) | WT (mm) | Side Tol. | WT Tol. |
|---|---|---|---|
| 10×10 | 1.0 | ±0.38mm | ±10.0% |
| 15×15 | 1.0 | ±0.38mm | ±10.0% |
| 20×20 | 1.2 | ±0.38mm | ±10.0% |
| 25×25 | 1.2 | ±0.38mm | ±10.0% |
| 30×30 | 1.5 | ±0.38mm | ±10.0% |
| 40×40 | 1.5 | ±0.51mm | ±10.0% |
| 50×50 | 2.0 | ±0.51mm | ±10.0% |
| 60×60 | 2.0 | ±0.51mm | ±10.0% |
| 75×75 | 2.5 | ±0.76mm | ±10.0% |
| 100×100 | 3.0 | ±0.76mm | ±10.0% |
| 125×125 | 4.0 | ±0.76mm | ±10.0% |
| 150×150 | 4.0 | ±1.52mm | ±10.0% |
- Supply Length / Form: Fixed lengths 1–12 m; custom lengths and cut-to-length available
- Available Grades: 304, 304L, 316, 316L, 201
- Surface Finish: Polished, mirror, brushed, or pickled
- Tolerance Compliance: Per ASTM A554, EN 10296-2, JIS G3446, or GB/T 18705 shaped-tube tolerance tables
Markets: Europe — welded stainless steel tube for general engineering (shaped tube)
| Size (mm) | WT (mm) | Side Tol. | WT Tol. |
|---|---|---|---|
| 10×10 | 1.0 | ±0.20mm (±2.0%) | ±0.13mm (±12.5%) |
| 20×20 | 1.5 | ±0.20mm (±1.0%) | ±0.19mm (±12.5%) |
| 30×30 | 1.5 | ±0.30mm (±1.0%) | ±0.19mm (±12.5%) |
| 40×40 | 2.0 | ±0.40mm (±1.0%) | ±0.25mm (±12.5%) |
| 50×50 | 2.0 | ±0.50mm (±1.0%) | ±0.25mm (±12.5%) |
| 60×60 | 2.5 | ±0.60mm (±1.0%) | ±0.31mm (±12.5%) |
| 80×80 | 3.0 | ±0.80mm (±1.0%) | ±0.38mm (±12.5%) |
| 100×100 | 3.0 | ±1.00mm (±1.0%) | ±0.38mm (±12.5%) |
- Supply Length / Form: Fixed lengths 1–12 m; custom lengths and cut-to-length available
- Available Grades: 304, 304L, 316, 316L, 201
- Surface Finish: Polished, mirror, brushed, or pickled
- Tolerance Compliance: Per ASTM A554, EN 10296-2, JIS G3446, or GB/T 18705 shaped-tube tolerance tables
Markets: Japan, Southeast Asia — stainless steel tube for machine & structural purposes
| Size (mm) | WT (mm) | Side Tol. | WT Tol. |
|---|---|---|---|
| 15×15 | 1.2 | ±0.20mm (±1.3%) | ±0.15mm (±12.5%) |
| 20×20 | 1.2 | ±0.20mm (±1.0%) | ±0.15mm (±12.5%) |
| 25×25 | 1.6 | ±0.25mm (±1.0%) | ±0.20mm (±12.5%) |
| 40×40 | 1.6 | ±0.40mm (±1.0%) | ±0.20mm (±12.5%) |
| 50×50 | 2.3 | ±0.50mm (±1.0%) | ±0.29mm (±12.5%) |
| 75×75 | 2.3 | ±0.75mm (±1.0%) | ±0.29mm (±12.5%) |
| 100×100 | 3.2 | ±1.00mm (±1.0%) | ±0.40mm (±12.5%) |
- Supply Length / Form: Fixed lengths 1–12 m; custom lengths and cut-to-length available
- Available Grades: 304, 304L, 316, 316L, 201
- Surface Finish: Polished, mirror, brushed, or pickled
- Tolerance Compliance: Per ASTM A554, EN 10296-2, JIS G3446, or GB/T 18705 shaped-tube tolerance tables
Markets: China domestic & Belt-and-Road — stainless steel welded structural tube
| Size (mm) | WT (mm) | Side Tol. | WT Tol. |
|---|---|---|---|
| 12×12 | 1.0 | ±0.20mm (±1.7%) | ±0.13mm (±12.5%) |
| 20×20 | 1.2 | ±0.20mm (±1.0%) | ±0.15mm (±12.5%) |
| 30×30 | 1.5 | ±0.30mm (±1.0%) | ±0.19mm (±12.5%) |
| 40×40 | 2.0 | ±0.40mm (±1.0%) | ±0.25mm (±12.5%) |
| 60×60 | 2.5 | ±0.60mm (±1.0%) | ±0.31mm (±12.5%) |
| 80×80 | 3.0 | ±0.80mm (±1.0%) | ±0.38mm (±12.5%) |
| 120×120 | 4.0 | ±1.20mm (±1.0%) | ±0.50mm (±12.5%) |
- Supply Length / Form: Fixed lengths 1–12 m; custom lengths and cut-to-length available
- Available Grades: 304, 304L, 316, 316L, 201
- Surface Finish: Polished, mirror, brushed, or pickled
- Tolerance Compliance: Per ASTM A554, EN 10296-2, JIS G3446, or GB/T 18705 shaped-tube tolerance tables
Standards
→ Scroll right for full chemistry & mechanical data
| Grade | US (UNS) | EN (W.Nr.) | Japan (JIS) | China (GB/T) | C % (Max) | Si % (Max) | Mn % (Max) | P % (Max) | S % (Max) | Cr % | Ni % | Mo % | Tensile σb (Min.) | Yield σ0.2 (Min.) | Elongation (Min.) | Hardness (Max) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 304 | S30400 | 1.4301 | SUS304 | 06Cr19Ni10 | 0.08 | 0.75 | 2.00 | 0.045 | 0.030 | 18.0-20.0 | 8.0-10.5 | — | 515 MPa (75 ksi) | 205 MPa (30 ksi) | 35% | ≤92 HRB / ≤215 HV |
| 304L | S30403 | 1.4307 | SUS304L | 022Cr19Ni10 | 0.030 | 0.75 | 2.00 | 0.045 | 0.030 | 18.0-20.0 | 8.0-12.0 | — | 485 MPa (70 ksi) | 170 MPa (25 ksi) | 35% | ≤92 HRB / ≤215 HV |
| 316 | S31600 | 1.4401 | SUS316 | 06Cr17Ni12Mo2 | 0.08 | 0.75 | 2.00 | 0.045 | 0.030 | 16.0-18.0 | 10.0-14.0 | 2.0-3.0 | 515 MPa (75 ksi) | 205 MPa (30 ksi) | 35% | ≤95 HRB / ≤215 HV |
| 316L | S31603 | 1.4404 | SUS316L | 022Cr17Ni12Mo2 | 0.030 | 0.75 | 2.00 | 0.045 | 0.030 | 16.0-18.0 | 10.0-14.0 | 2.0-3.0 | 485 MPa (70 ksi) | 170 MPa (25 ksi) | 35% | ≤95 HRB / ≤215 HV |
| 321 | S32100 | 1.4541 | SUS321 | 06Cr18Ni11Ti | 0.08 | 0.75 | 2.00 | 0.045 | 0.030 | 17.0-19.0 | 9.0-12.0 | — | 515 MPa (75 ksi) | 205 MPa (30 ksi) | 35% | ≤95 HRB / ≤215 HV |
| 430 | S43000 | 1.4016 | SUS430 | 10Cr17 | 0.12 | 1.00 | 1.00 | 0.040 | 0.030 | 16.0-18.0 | — | — | 450 MPa (65 ksi) | 205 MPa (30 ksi) | 22% | ≤89 HRB / ≤200 HV |
- Standards Conformance: ASTM A554/A312 · EN 10296-2/10210-1 · JIS G3446/G3466 · GB/T 18705/19228 · ISO 2037
- Delivery Condition: Solution Annealed & Pickled (AP) / Bright Annealed (BA) / Polished, or as requested.
- Mill Test Certificate: 100% full material traceability with EN 10204 3.1 MTC provided with every shipment.
Features
• High strength-to-weight ratio
• Aesthetic surface finish options
• Excellent resistance to corrosion and wear
• Suitable for welding and fabrication
• Building and architectural structures
• Furniture and decorative frames
• Industrial frameworks and bracing
• Equipment enclosures and racks
Applications
For structural square tube applications, see how buyers can verify our roll-forming lines, corner-squareness checks, mechanical testing, and batch inspection reports.
Quality Control
• Visual and dimensional inspection
• Surface finish and weld seam testing
• Mechanical property testing (tensile, hardness)
• Optional third-party certification
packaging
PVC Wrapping
& End Caps
Custom Barcoding
& Labeling
Anti-Corrosion
& Moisture Protection
Seaworthy Wooden Cases & Pallets
Square Tube Packaging & Inspection Photos
Real factory, inspection, packaging and loading photos from TeCarve gallery pages.
Tailored Solutions, Timely Fulfillment
CUSTOMIZATION
& DELIVERY
Flexible Custom Manufacturing
We tailor stainless steel square pipe and tube by square section size, wall thickness, custom length, grade, polished, mirror, brushed, or pickled finish, tube type, and dimensional tolerance.
Low MOQ & Rapid Prototyping
Small batch customization and sample production are supported, helping you shorten your development cycle and market entry.
Optimized Lead Time
Most orders ship within 10–25 days after deposit. Exact timing depends on product specification, required documentation, and order volume.
Global Logistics & On-Time Delivery
For square tube deliveries to over 50 countries, seaworthy wooden cases and pallets support the profiles while custom barcoding and labeling keeps bundled sizes identifiable.
Frequently Asked Questions
What are stainless steel square tubes used for?
Stainless steel square tubes are used in structural frameworks, handrails, furniture, architectural facades, food processing equipment, conveyor systems, and industrial supports where corrosion resistance is required alongside structural rigidity.
What sizes are available for stainless steel square tube?
TeCarve supplies square tubes from 10×10 mm to 150×150 mm with wall thickness 0.5 mm to 6 mm. Standard length is 6 m; cut-to-length is available. Grades 201, 304, and 316L in welded or seamless construction.
What surface finishes are available for stainless steel square tube?
Available finishes: No. 1 (hot rolled), 2B (cold rolled mill), No. 4 (brushed/satin), No. 8 (mirror), and PVD-coloured (gold, black, rose gold). Mirror finish square tube is widely used for decorative architectural and display applications.
What dimensional tolerances apply to stainless steel square tube?
Tolerances follow EN 10219 or ASTM A554: side-dimension tolerance ±0.5% or ±0.5 mm (whichever is greater), wall-thickness tolerance +15%/–10%, straightness ≤ 2 mm/m. Tighter precision tolerances are available for structural or precision machine applications.
Can custom corner radius stainless steel square tube be produced?
Yes. External corner radius typically ranges from 1.5t to 3t (where t = wall thickness). Sharp-corner square tube for architectural use and large-radius corner tube for sanitary or ergonomic applications are produced to customer specifications.