304 Stainless Steel Square Tube Products Description
Our 304 stainless steel square tubes are made according to ASTM A249/A269 standards. They contain 18-20% chromium and 8-10.5% nickel. It is precisely because of this combination of ingredients that its corrosion resistance is particularly good. According to the ASTM B117 standard, the salt spray test will not produce red rust after 500 hours, which is 200 hours more than the minimum requirement.
Its tensile strength is between 515-690 MPa, and its elongation can reach 40%, so it is not easy to crack when welding or bending, and it is very convenient to operate. Wholesale people know that this pipe has a wide range of uses - the surface meets FDA standards and can be used in the food processing industry; it is also suitable for building railings and the like, and it is suitable for any industry.
304 Stainless Steel Square Tube Factory Processing
We offer three surface finishes: 2B (mill finish, Ra 0.4-0.8μm per ASTM B46.1), BA (bright annealed, Ra 0.1-0.3μm) for visible applications, and pickled (per ASTM A380) for heavy-duty use. The BA finish undergoes bright annealing in a hydrogen atmosphere, giving it a mirror-like look that cuts down on post-processing costs for your clients.
Our cutting services handle lengths from 1m to 6m with ±1mm tolerance, using laser cutters that leave burr-free edges (≤0.05mm protrusion). We also offer deburring and end-capping to prevent debris from entering during transportation-small details that save your team time.
304 Stainless Steel Square Tube Production Strength
As a Chinese manufacturer with 10 years exporting to Europe and the US, we run 8 tube mills , churning out 30,000 tons of 304 Stainless Steel Square Tube annually. Our in-house lab uses X-ray fluorescence (XRF) to check chemical composition, with each batch testing within 0.1% of ASTM standards.
We keep 800-1,200 tons in stock at our warehouse, covering common sizes (20x20mm to 100x100mm, wall thickness 0.8-5mm). Inventory updates in real time on our site, and we can ship FOB Guangzhou within 48 hours for in-stock items-critical for meeting your tight delivery windows.
Factory Commitments
Orders over 50 tons get a 5% discount, plus free cutting and 15% of sea freight covered to Antwerp or Houston (we've got long-term deals with MSC and Evergreen).
Here's our promise: if any tube fails ASTM A249 mechanical tests or has a wall thickness tolerance over ±0.05mm, we'll replace it within 7 days and refund the shipping costs. We also lock prices for 30 days on confirmed orders, so you won't get caught off guard by market jumps.
304 Stainless Steel Square Tube Specification Table
| Item | Details | Remarks |
| Material Grade | SUS304 / 06Cr19Ni10 / 1.4301 / AISI 304 | Universal corrosion resistance for general application |
| Executive Standard | GB/T 12770 (Industrial Grade),YB/T 5363 (Decorative Grade) | Industrial grade: higher precision; Decorative grade: better surface finish |
| Standard Length | 6000mm (6m),Custom length: 3000-12000mm (3-12m) | Customized length is available with advance notice |
| Surface Finish | 2B / Hairline / Bright Annealed (BA) / Mirror Polished | Hairline finish for decoration; 2B for industrial use |
| Theoretical Weight Formula | Weight (kg/m) = (Side Length - Wall Thickness) × Wall Thickness × 0.00793 | Industry universal formula for quick quotation |
| Side Length (mm) | Common Wall Thickness (mm) | Typical Application |
| 10×10 | 0.4, 0.5, 0.6, 0.8 | Small brackets, precision fittings |
| 15×15 | 0.6, 0.8, 1.0, 1.2 | Furniture frames, small guardrails |
| 20×20 | 0.8, 1.0, 1.2, 1.5 | Railing, door & window frames, storage racks |
| 25×25 | 1.0, 1.2, 1.5, 2.0 | Stair handrails, fence columns |
| 30×30 | 1.2, 1.5, 2.0, 2.5 | Guardrail, equipment frames, photovoltaic brackets |
| 38×38 | 1.5, 2.0, 2.5, 3.0 | Architectural decoration, mechanical support |
| 40×40 | 1.5, 2.0, 2.5, 3.0 | Equipment base, structural columns |
| 50×50 | 2.0, 2.5, 3.0, 4.0 | Heavy-duty racks, chemical equipment accessories |
| 60×60 | 2.5, 3.0, 4.0, 5.0 | Large structure, pipeline support |
| 80×80 | 3.0, 4.0, 5.0, 6.0 | Mechanical load-bearing parts, equipment shell |
| 100×100 | 3.0, 4.0, 5.0, 8.0 | Industrial equipment, steel structure beams & columns |
| 120×120 ~ 150×150 | 4.0, 5.0, 6.0, 8.0 | Large engineering projects, heavy machinery |
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