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ASTM A554 316L Welded Stainless Steel Square Tube Ornamental and Structural Grade
| MOQ: | 5Ton |
| Price: | Based on grade, size, surface, processing, quantity and current raw material market price. |
| Standard Packaging: | Standard seaworthy export packing with bundles, waterproof wrapping, pallets or wooden cases. |
| Delivery Period: | 7-15 |
| Payment Method: | L/C,D/A,D/P,T/T,Western Union |
| Supply Capacity: | Stock supply, regular production and custom manufacturing available. |
Shaanxi Shangyou Stainless Steel Co., Ltd. supplies ASTM A554 316L welded stainless steel square tube for global fabricators, architectural contractors, equipment manufacturers, and marine engineers requiring molybdenum-alloyed tubing with enhanced corrosion resistance in chloride environments. Produced to ASTM A554/A554M, this specification covers welded stainless steel mechanical tubing intended for ornamental, structural, exhaust, and other applications where appearance, mechanical properties, or corrosion resistance is needed.
ASTM A554 is the standard specification for welded stainless steel mechanical tubing. The specification covers as-welded or cold-reduced mechanical tubing in sizes to 16 in. [406.4 mm] outside dimension, and wall thicknesses 0.020 in. [0.51 mm] and over, in round, square, rectangular, or special shapes. 316L (UNS S31603) is the low-carbon molybdenum-bearing variant containing 2.0-3.0% molybdenum, which provides significantly improved resistance to pitting and crevice corrosion in chloride-containing environments compared to 304/304L. The tubes are manufactured from flat-rolled steel by an automatic welding process without the addition of filler metal.
| Dimension | Specification |
|---|---|
| Product Name | ASTM A554 316L Welded Stainless Steel Square Tube |
| Product Alias | Ornamental Square Tube / Structural Square Tube / 316L Square Tube / Square Hollow Section (SHS) |
| Material Type | Austenitic Stainless Steel (Welded, No Filler Metal) |
| Key Feature | 2-3% Mo for pitting resistance; low carbon prevents sensitization; OD to 16in; ornamental and structural grade |
| UNS Number | UNS S31603 |
| Chemical Composition | Cr 16.0-18.0% / Ni 10.0-15.0% / Mo 2.0-3.0% / C ≤0.035% / Mn ≤2.00% / Si ≤1.00% / Fe Balance |
| Mechanical Properties | Tensile ≥483 MPa / Yield ≥172 MPa / Elongation ≥35% |
| Manufacturing Process | Flat-Rolled Coil → Forming → Automatic Welding (No Filler Metal) → Sizing → Testing |
| Delivery Condition | As-Welded / Cold-Reduced |
| Shape | Square (Round/Rectangular/Special also available) |
| Primary Applications | Handrails / Structural Frames / Marine Environments / Chemical Processing / Furniture / Architectural Decor |
| Parameter | Available Options |
|---|---|
| Product Standard | ASTM A554/A554M |
| Grade | MT-316L (UNS S31603) |
| Outside Dimension (OD) | Up to 16 in. [406.4 mm] |
| Wall Thickness (WT) | 0.020 in. [0.51 mm] and over |
| Shape | Square |
| Length | Cut-to-length per order; standard lengths 17-24ft (5.2-7.3m) |
| Welding Process | Automatic welding, no filler metal added |
| Delivery Condition | As-Welded / Cold-Reduced / Welded & Drawn |
| Inspection | Tension Test / Flattening Test / Hydrostatic or NDE Test |
| Documents | MTC 3.1 / Inspection Reports / Packing List / Heat Number Traceability |
ASTM A554 316L square tube is specified for ornamental, structural, and marine applications where chloride-induced pitting is a concern.
Typical applications include:
- Architectural handrails, balustrades, and stair railings (marine/coastal environments)
- Furniture frames and display fixtures
- Chemical and pharmaceutical processing equipment frames
- Marine and coastal structures exposed to saltwater
- Food processing equipment (hygienic-grade polished finishes)
- Structural tubing for scaffolding and support structures
Key selection considerations: Select 316L over 304 when the application is exposed to chloride-containing environments (seawater, salt spray, de-icing salts, chemical exposure). The 2-3% molybdenum addition provides significantly better pitting and crevice corrosion resistance. The low carbon content (≤0.035%) makes 316L the preferred choice for welded applications, eliminating sensitization risk. ASTM A554 is the mechanical tubing specification—these tubes are not intended for pressure-containing or fluid-handling systems. 316L can often be dual-certified as 316 when the composition meets both requirements.
Shangyou Stainless Steel provides value-added processing including custom cutting, bending, welding, and polishing for square tubing.
All tubes are packed with export-standard protection including plastic sleeving, protective end caps, steel strapping, waterproof wrapping, and wooden pallets or steel frames.
Quality documents include MTC 3.1, inspection reports, packing list, and heat number traceability. Third-party inspection (SGS, TUV, BV) can be arranged upon request.
1. What is ASTM A554?
ASTM A554 is the standard specification for welded stainless steel mechanical tubing for ornamental, structural, exhaust, and other applications.
2. What is the UNS number for 316L?
UNS S31603.
3. What is the chemical composition of 316L?
Cr 16.0-18.0%, Ni 10.0-15.0%, Mo 2.0-3.0%, C ≤0.035%, Fe Balance.
4. What mechanical properties does 316L have?
Tensile ≥483 MPa, Yield ≥172 MPa, Elongation ≥35%.
5. What is the advantage of 316L over 304?
316L contains 2-3% molybdenum, providing superior pitting and crevice corrosion resistance in chloride environments.
6. What size range does ASTM A554 cover?
Up to 16 in. [406.4 mm] outside dimension, with wall thickness 0.020 in. [0.51 mm] and over.
7. Is filler metal used in welding ASTM A554 tube?
No. Tubes are made by an automatic welding process without filler metal.
8. What shapes are available?
Round, square, rectangular, or special shapes.
9. Can ASTM A554 tube be used for pressure applications?
No. ASTM A554 is for mechanical/structural applications only, not pressure-rated systems.
10. What are typical applications for 316L square tube?
Marine environments, chemical processing, architectural handrails, structural frames, and food processing equipment.
Need ASTM A554 316L welded stainless steel square tube for marine, architectural, structural, or chemical applications? Send requirements including grade (316L), outside dimension/wall thickness/length, quantity, and intended application.
Shangyou Stainless Steel provides custom sizes, processing, and export solutions for global B2B customers.
