Stainless Steel Square Tubes

Stainless steel square tubes are hollow, square-shaped sections made from stainless steel. They are produced by forming stainless steel sheets or strips into a square shape and welding the seams. These tubes are available in various sizes, wall thicknesses, and grades to meet different requirements.


Standard:ASTM EN DIN GB ISO JISCertification:SGS, ISO, ROHS
Length:6000-25000mm, etcSurface:2B, 2D, BA, NO.1, NO.4, NO.8, 8K, Pickling, Bright, Mirror, Checkered, Embossed, Hair line, Sand blast, Brush, Etching, etc
Diameter:3mm–1000mm, etcProduction Process:Cold Drawn, Cold Rolled, Bright Anneal, etc
Thickness:0.5-40mmSurface Treatment:Standard export package, suit for all kinds of transport, or as required.
Export Packing:Waterproof Paper, Steel Strip Packed and other Standard Export Seaworthy Package, or customized packageLoading Port:Pickled, Passivation, Inside & Outside Mechanical Polishing, BA, Electropolishing (EP)
Heat Treatment Condition:Solution Annealing and water rapid quenched, Bright Annealing,Stess Relieving Heat Treatment for U tubesTrade Terms:FOB, CNF, CIF
Grade:201, 202, 304, 304L, 309, 309S, 310S, 316, 316L, 316Ti, 317L, 321, 347H, 409, 409L, 410, 410S, 420(420J1,420J2), 430, 436, 439, 441, 444, 446, 1.4301, 1.4307, 1.4541, 1.4401, 1.4404 ,1.4571, 1.4438, 1.4539, 1.4547, 1.4529, 1.4562, 1.4410, 1.4878, 1.4845, 1.4828, 1.4876, 2.4858, 2.4819
Advantage:1. high quality surface, clean finished; 2. corrosion & oxidation resistance, more durable; 3. high ductility and good toughness; 4. high strength and to deform; 5. the use to diversity
Container Size:20ft GP: 5898mm(Length)x2352mm(Width)x2393mm(High); 40ft GP: 12032mm(Length)x2352mm(Width)x2393mm(High); 40ft HC: 12032mm(Length)x2352mm(Width)x2698mm(High)

Typical Chemistry:

The chemical composition of stainless steel square tubes varies depending on the grade. Common grades and their compositions include:

  • Austenitic Stainless Steels (e.g., 304, 316):

    • Iron (Fe): Balance
    • Chromium (Cr): 16-18% (304), 16-18% (316)
    • Nickel (Ni): 8-10.5% (304), 10-14% (316)
    • Manganese (Mn): Up to 2%
    • Silicon (Si): Up to 1%
    • Carbon (C): 0.08% max (304), 0.08% max (316)
    • Molybdenum (Mo) (in 316): 2-3%
  • Ferritic Stainless Steels (e.g., 430):

    • Iron (Fe): Balance
    • Chromium (Cr): 16-18%
    • Carbon (C): 0.12% max
    • Nickel (Ni): Up to 0.75%
    • Manganese (Mn): Up to 1%

Physical Properties:

The physical properties of stainless steel square tubes depend on the grade and processing. Typical properties include:

  • Density: Approximately 7.8 g/cm³
  • Tensile Strength:
    • Austenitic: 520-750 MPa
    • Ferritic: 450-600 MPa
  • Yield Strength:
    • Austenitic: 210-450 MPa
    • Ferritic: 280-380 MPa
  • Elongation:
    • Austenitic: 40-60%
    • Ferritic: 20-30%
  • Hardness:
    • Varies by grade and condition (e.g., annealed, cold worked)
  • Corrosion Resistance: Excellent, especially in austenitic grades like 304 and 316
  • Thermal Conductivity: Lower than carbon steel
  • Magnetic Properties: Non-magnetic (austenitic), magnetic (ferritic and martensitic)


Key features of stainless steel square tubes include:

  • Corrosion Resistance: Exceptional resistance to rust and corrosion, making them ideal for harsh environments and corrosive media.
  • Strength and Durability: High tensile and yield strength provide excellent structural integrity, ensuring long service life.
  • Heat Resistance: Good performance at high temperatures, particularly in grades like 304 and 316.
  • Hygiene: Easy to clean and maintain, making them suitable for food, beverage, and medical applications.
  • Aesthetic Appeal: Attractive surface finishes available in various grades and textures.
  • Workability: Excellent formability and weldability, allowing for complex shapes and structures.
  • Recyclability: Environmentally friendly, as stainless steel can be fully recycled.
  • Low Maintenance: Requires minimal upkeep due to its corrosion resistance and durability.
  • Versatility: Suitable for a wide range of applications, from industrial to decorative.

Our Certifications

Packaging and Shipping

1. Wood pallet packing cover with water-proof paper
2. Steel pallet packing cover with water-proof paper
3. Wood box packing
4. Steel pallet packing cover with steel box
5. In bundles with steel strip no extra packing

package and shipment


  • High Precision Dimension: The carbon steel profile has excellent processing technology good molding and easy welding. Thickened material, stable performance, and high hardness, not easy to rust.
  • Low Friction: Low dissipation factor. More durable than most ordinary domestic bearings. Lower operating costs​
  • Life Is Long: High-quality steel through strict quality inspection, quality control layer-by-layer detection, and reliable quality, long service life.
  • Customization: Drawings and samples can be processed and customized. Conventional large-scale spot, non-standard customization.
Scroll to Top