stainless steel
rectangular
pipe & tube
TeCarve is a premier manufacturer-backed China stainless steel rectangular pipe and tube supplier engineered to ASTM A554 standards for structural, architectural, facade, and industrial framework applications. Available welded and seamless profiles cover dimensions from 20×10 mm up to 200×100 mm in grades 304, 304L, 316, and 316L.
Engineered with directional bending resistance (major axis moment of inertia Ix > minor axis Iy), rectangular tubing provides optimal flexural rigidity for horizontal beams, transoms, and slim architectural enclosures, delivering up to 15%–30% weight savings over square profiles under single-axis loading. In-stock standard items ship in 7–10 days; custom dimensions, cut-to-length runs, and 180–600 Grit finishes typically ship in 10–25 days with flexible 100–300 kg trial order support. For multi-axis column designs with equal-axis symmetry, explore our companion ASTM A554 Square Tubing range.
Structural & Fabricated Stainless Steel Rectangular Tubing
Specifications
ASTM A554 & International Standards Specification Matrix
Markets: N. America — welded mechanical/structural/ornamental rectangular tube
| Size W×H (mm) | WT (mm) | Side Tol. | WT Tol. |
|---|---|---|---|
| 20×10 | 1.0 | ±0.38mm | ±10.0% |
| 30×15 | 1.2 | ±0.38mm | ±10.0% |
| 40×20 | 1.5 | ±0.51mm | ±10.0% |
| 50×25 | 1.5 | ±0.51mm | ±10.0% |
| 60×30 | 2.0 | ±0.51mm | ±10.0% |
| 80×40 | 2.0 | ±0.76mm | ±10.0% |
| 100×50 | 2.5 | ±0.76mm | ±10.0% |
| 120×60 | 3.0 | ±0.76mm | ±10.0% |
| 150×75 | 3.0 | ±1.52mm | ±10.0% |
| 200×100 | 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, 321, 201
- Surface Finish: Mill finish (as-welded), 180–320 Grit satin/brushed, 400–600 Grit mirror, or passivated
- Tolerance Compliance: Per ASTM A554, EN 10296-2, JIS G3446, or GB/T 18705 shaped-tube tolerance tables
Markets: Europe — welded circular and non-circular steel tubes for mechanical & general engineering
| Size W×H (mm) | WT (mm) | Side Tol. | WT Tol. |
|---|---|---|---|
| 25×15 | 1.5 | ±0.30mm (±2.0%) | ±0.19mm (±12.5%) |
| 40×20 | 2.0 | ±0.40mm (±2.0%) | ±0.25mm (±12.5%) |
| 50×25 | 2.0 | ±0.50mm (±2.0%) | ±0.25mm (±12.5%) |
| 60×30 | 2.5 | ±0.60mm (±2.0%) | ±0.31mm (±12.5%) |
| 80×40 | 3.0 | ±0.80mm (±2.0%) | ±0.38mm (±12.5%) |
| 100×50 | 3.0 | ±1.00mm (±2.0%) | ±0.38mm (±12.5%) |
| 150×75 | 4.0 | ±1.50mm (±2.0%) | ±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, 321, 201
- Surface Finish: Mill finish (as-welded), 180–320 Grit satin/brushed, 400–600 Grit mirror, or passivated
- 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 W×H (mm) | WT (mm) | Side Tol. | WT Tol. |
|---|---|---|---|
| 30×20 | 1.2 | ±0.30mm (±2.0%) | ±0.15mm (±12.5%) |
| 40×20 | 1.6 | ±0.40mm (±2.0%) | ±0.20mm (±12.5%) |
| 50×25 | 1.6 | ±0.50mm (±2.0%) | ±0.20mm (±12.5%) |
| 75×45 | 2.3 | ±0.75mm (±2.0%) | ±0.29mm (±12.5%) |
| 100×50 | 3.2 | ±1.00mm (±2.0%) | ±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, 321, 201
- Surface Finish: Mill finish (as-welded), 180–320 Grit satin/brushed, 400–600 Grit mirror, or passivated
- 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 W×H (mm) | WT (mm) | Side Tol. | WT Tol. |
|---|---|---|---|
| 20×10 | 1.0 | ±0.20mm (±2.0%) | ±0.13mm (±12.5%) |
| 40×20 | 1.5 | ±0.40mm (±2.0%) | ±0.19mm (±12.5%) |
| 60×30 | 2.0 | ±0.60mm (±2.0%) | ±0.25mm (±12.5%) |
| 100×50 | 3.0 | ±1.00mm (±2.0%) | ±0.38mm (±12.5%) |
| 150×75 | 4.0 | ±1.50mm (±2.0%) | ±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, 321, 201
- Surface Finish: Mill finish (as-welded), 180–320 Grit satin/brushed, 400–600 Grit mirror, or passivated
- Tolerance Compliance: Per ASTM A554, EN 10296-2, JIS G3446, or GB/T 18705 shaped-tube tolerance tables
Rectangular Tube vs. Square Tube: Directional Load & Application Comparison
Both stainless steel rectangular tubes (RHS) and stainless steel square tubes (SHS) conform to ASTM A554 standards for welded ornamental, mechanical, and structural tubing. However, cross-sectional geometry creates distinctly different flexural and spatial advantages:
| Technical Parameter | Rectangular Hollow Section (RHS) | Square Hollow Section (SHS) |
|---|---|---|
| Cross-Section Aspect Ratio | Width ≠ Height (Aspect Ratio 1.5:1 to 3:1) e.g., 40×20, 60×30, 80×40, 100×50 mm | Width = Height (Aspect Ratio 1:1) e.g., 20×20, 40×40, 50×50, 100×100 mm |
| Moment of Inertia (Flexural Rigidity) | Directional Asymmetry: Ix-x >> Iy-y Maximum bending resistance along the major vertical axis. Delivers 15%–30% steel weight savings compared to an equivalent-depth square beam under single-plane loading. | Isotropic Symmetry: Ix-x = Iy-y Uniform bending resistance across both orthogonal axes; optimal for bi-axial lateral wind loads, torsional forces, and multi-directional bracing. |
| Primary Structural Function | Beams, Transoms, Cantilevers, & Enclosures Engineered for unidirectional transverse loads where deflection along the vertical plane is the governing design factor. | Columns, Corner Posts, & Trusses Equal radius of gyration (rx = ry) provides maximum resistance against axial column buckling in compression. |
| Installation Profile & Clearance | Slim Low-Profile Depth Ideal for shallow wall recesses, architectural glass curtain wall mullions, flush perimeter railings, and linear machine chassis. | Symmetrical Footprint Uniform multi-directional coping and welding for 90° coplanar framework joints and perimeter safety balustrades. |
| Governing Standard & Sizing | ASTM A554 RHS: 20×10 mm to 200×100 mm WT: 1.0 mm – 4.0 mm (custom up to 6.0 mm) | ASTM A554 SHS: 10×10 mm to 300×300 mm WT: 0.5 mm – 6.0 mm |
Specify rectangular tubing when transverse loads act in a single dominant plane (e.g. canopy purlins, window transoms, conveyor framework) or when lateral space is constrained. Orienting the deeper dimension vertically maximizes load capacity at minimum cost.
Specify square tubing for vertical columns, multi-axis structural frames, or handrail balustrade posts where loads can arrive from any direction. Review our ASTM A554 Square Tubing catalog for dimensional details.
Unlike primary state mills requiring large 3–5 tonne minimums, TeCarve supports 100 – 300 kg flexible trial orders for standard and non-standard rectangular sections. Fast CAD/DWG evaluation, precision cut-to-length processing, and full 100% heat-traceable EN 10204 3.1 MTC documentation.
TeCarve operates strictly under certified ISO 9001:2015, ISO 14001:2015, and ISO 45001:2018 management systems. Every rectangular tubing shipment is accompanied by an authentic EN 10204 3.1 Mill Test Certificate (MTC) detailing chemical composition, tensile/yield strengths, elongation, weld eddy-current verification, and dimensional accuracy. Third-party inspection (SGS, BV, TÜV) can be arranged upon project request.
Comparing asymmetric rectangular sections with uniform square profiles for framing or column duties? Read our detailed guide: Square Pipe & Tube vs Rectangular Pipe & Tube: Key Differences.
Get Your Rectangular Tube Quote
Sourcing stainless steel rectangular tubing for directional load-bearing beams, transport equipment chassis, architectural facades, or heavy framing? Contact our sales desk for mill direct pricing, strict straightness tolerances, and trial orders (100–300 kg MOQ supported).
Engineered for high moment of inertia along the major axis, providing superior bending resistance in structural spans.
Short rectangular tube samples provided for profile fit, laser miter cutting, and surface roughness evaluation.
Verify prototype chassis welding, fixture fit-up, or architectural mockups with low-MOQ trial quantities.
Complete EN 10204 3.1 test reports covering mechanical tensile/yield strength, dimensional squareness, and weld integrity.
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 | 8.0-11.0 | — | 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 10296/10217-7 · JIS G3446/G3468 · GB/T 12770/18705 · ISO 1127
- 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
• Sleek rectangular geometry
• Excellent mechanical strength
• Rust and weather-resistant surface
• Decorative and structural uses
• Commercial and residential construction
• Furniture frames and handrails
• Machinery and equipment support
• Signage structures and display systems
Applications
For structural rectangular tube projects, explore how to verify our corner radius consistency, weld seam integrity, tensile testing, and mill test certificates.
Quality Control
• Dimensional inspection and surface testing
• Non-destructive testing (NDT) for weld integrity
• Visual and mechanical property checks
• Compliance with international material standards
packaging
PVC Wrapping
& End Caps
Custom Barcoding
& Labeling
Anti-Corrosion
& Moisture Protection
Seaworthy Wooden Cases & Pallets
Rectangular Tube Packaging & Inspection Photos
Real product, inspection, packaging and loading photos.
Tailored Solutions, Timely Fulfillment
CUSTOMIZATION
& DELIVERY
Flexible Custom Manufacturing
We customize stainless steel rectangular pipe and tube by width, height, wall thickness, custom length, grade, surface finish, welded or seamless construction, and specified dimensional tolerances.
Low MOQ & Rapid Prototyping
Small batch customization and sample production are supported, helping you shorten your development cycle and market entry.
Optimized Lead Time
In-stock standard sizes ship within 7–10 days. Custom specifications typically ship within 10–25 days after deposit, depending on order volume, dimensions, and surface finish. The full cycle—from inquiry and drawing confirmation through sampling, production, inspection, and dispatch—typically takes 33–55 days for custom items.
Global Logistics & On-Time Delivery
For rectangular tube exports worldwide, seaworthy wooden cases and pallets protect the profiles, with custom barcoding and labeling used to distinguish dimensions and finishes.
How your order is made, checked and shipped
Tube forming at the partner factory
Heat treatment (annealing)
Dimensional inspection
Alloy verification with a handheld analyzer
Export packing
Container loading
What Overseas Buyers Say About TeCarve Tubing
“I've received the goods and everything is fine.”
“The goods already send to customers. I am waiting for the next order from them.”
“…there is no need of inspection this time… I trust in your product.”
Frequently Asked Questions
What grades of stainless steel are available for rectangular tube?
Rectangular stainless steel tube is available in grades 201, 304, 304L, 316, 316L, and 321. Grade 304 is the most economical choice; grade 316L is recommended for marine, chemical, food-contact, or coastal outdoor environments.
What sizes does TeCarve offer for rectangular stainless steel tube?
Rectangular tubes are available with width from 10 mm to 200 mm, height from 10 mm to 100 mm, and wall thickness from 0.5 mm to 6 mm. Custom aspect ratios and non-standard dimensions are available. Cut-to-length and beveled or plain end processing are offered.
What standards do stainless steel rectangular tubes comply with?
Our rectangular tubes comply with ASTM A554, ASTM A312, EN 10296, EN 10217-7, JIS G3446, JIS G3468, GB/T 12770, GB/T 18705, and ISO 1127. Mill Test Certificates with chemical analysis and mechanical properties accompany every shipment.
What applications use rectangular stainless steel tubing?
Common applications include machine frames, food processing tables, conveyor structures, display fixtures, sign structures, vehicle exhaust systems, and architectural facades where both structural strength and corrosion resistance are required.
What is the structural difference between rectangular and square tube?
Rectangular tube has different second moments of area on each axis, making it stiffer in one bending direction. It is preferred for beams and horizontal supports carrying primary loads in one plane. Square tube provides equal stiffness in all lateral directions, making it better for columns and multi-axis loading.
What dimensional tolerances apply to ASTM A554 rectangular tubing?
Rectangular tubing is produced in accordance with ASTM A554 requirements. Outside dimensions and corner radii are controlled to standard specifications, and wall thickness tolerance is ±10%. Custom tight tolerances and cut-to-length dimensions are confirmed per customer drawing.
Can TeCarve provide slotting and secondary fabrication?
Yes. We provide precision cutting, slotting and deburring at our partner factories per customer drawings.
Do you offer DDP shipping terms to the United States?
Yes. In addition to FOB and CIF, we can arrange project-based DDP shipping directly to your facility.
Contact TeCarve