Weldable Stainless Steel Square Tube Brushed Polished Stainless Steel Square Tubing
The Stainless Steel Welded Square Tubing is manufactured from high-quality austenitic stainless steel coils, formed into a square shape, and longitudinally welded using advanced TIG (GTAW) or ERW processes. This product offers an excellent combination of corrosion resistance, structural strength, and aesthetic appeal. Its square profile provides superior load-bearing characteristics, ease of fabrication, and clean, modern appearance, making it the preferred choice for structural, architectural, and industrial applications.
| Parameter | Details |
|---|---|
| Standards | ASTM A554, A269, A312; EN 10219-2; JIS G3446 |
| Available Grades | 304, 304L, 316, 316L, 201 |
| Square Sizes | 10 mm * 10 mm – 300 mm * 300 mm (3/8″ * 3/8″ – 12″ * 12″) |
| Wall Thickness | 0.5 mm – 6.0 mm (20 ga – 1/4″) |
| Length | Fixed lengths 3m / 6m, or custom lengths upon request |
| Welding Process | TIG (GTAW), Laser, or ERW |
| Heat Treatment | Annealed after welding (typical) |
| Surface Finish | Mill finish, pickled, polished (180-600 grit), brushed, or mirror |
| Corner Radius | Sharp square or radiused (as required) |
| End Finish | Plain ends, capped, or punched |
| Grade | C ≤ | Si ≤ | Mn ≤ | P ≤ | S ≤ | Cr | Ni |
|---|---|---|---|---|---|---|---|
| 304 | 0.08 | 0.75 | 2.00 | 0.045 | 0.030 | 18.0-20.0 | 8.0-10.5 |
| 304L | 0.03 | 0.75 | 2.00 | 0.045 | 0.030 | 18.0-20.0 | 8.0-12.0 |
| 316 | 0.08 | 0.75 | 2.00 | 0.045 | 0.030 | 16.0-18.0 | 10.0-14.0 |
| 316L | 0.03 | 0.75 | 2.00 | 0.045 | 0.030 | 16.0-18.0 | 10.0-14.0 |
Composition per ASTM A554. Molybdenum grades (316/316L) available for enhanced corrosion resistance.
| Grade | Tensile Strength (MPa) min | Yield Strength (MPa) min | Elongation (%) min | Hardness (HRB) max |
|---|---|---|---|---|
| 304 | 515 | 205 | 35 | 92 |
| 304L | 485 | 170 | 35 | 92 |
| 316 | 515 | 205 | 35 | 95 |
| 316L | 485 | 170 | 35 | 95 |
Tested in accordance with ASTM E8 / E8M.
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High Strength-to-Weight Ratio – Square geometry provides excellent structural rigidity
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Superior Corrosion Resistance – Suitable for indoor, outdoor, and marine environments
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Aesthetic Appearance – Clean lines and polished finishes for architectural use
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Excellent Weldability – Can be easily welded to other stainless steel components
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Good Formability – Bendable and machinable for custom fabrications
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Low Maintenance – Easy to clean, resistant to staining and rust
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Hygienic Surface – Non-porous surface ideal for food and pharmaceutical applications
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Fire Resistant – Non-combustible, maintains integrity at high temperatures
| Parameter | Tolerance |
|---|---|
| Outside dimensions | ±0.4 mm for sizes ≤ 50 mm; ±0.8% for larger sizes |
| Wall thickness | ±10% |
| Length | +0 / -3 mm for fixed lengths |
| Twist | 1 mm + 0.5 mm per meter |
| Concave / Convex | 0.8% of width |
| Squareness of corners | 90° ± 1° |
| Finish | Description | Application |
|---|---|---|
| Mill Finish | As-welded, oxide scale present | Industrial / hidden structures |
| Pickled | Acid-cleaned, removes scale | Chemical / marine environments |
| Brushed / Satin | 180-320 grit directional grain | Architectural railings, furniture |
| Polished | 400-600 grit, semi-reflective | Food equipment, decorative trim |
| Mirror | 800+ grit, highly reflective | Elevator interiors, luxury architecture |
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Building frameworks and supports
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Bridge railings and crash barriers
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Mezzanine floors and platforms
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Scaffolding and guardrails
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Handrails, balustrades, and staircases
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Window and door frames
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Curtain wall supports
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Decorative screens and partitions
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Conveyor frames and machine guards
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Equipment stands and workbenches
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Storage racks and shelving
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Cart and trolley frames
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Truck and trailer body frames
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Bus handrails and grab bars
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Marine railings (316 grade)
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Railway station structures
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Sanitary equipment frames
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Workstation legs and supports
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Cleanroom structures
| Process | Recommendation |
|---|---|
| Cutting | Band saw, abrasive wheel, or plasma cutter |
| Welding | TIG (GTAW) recommended; use matching filler rod (ER308/ER316) |
| Bending | Use mandrel bender for tight radii; annealed condition preferred |
| Drilling | Cobalt or carbide drill bits; use cutting fluid |
| Surface Protection | Apply peelable film or tape during fabrication to prevent scratches |
For inquiries, technical datasheets, or custom sizes, please contact our sales team.
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