SS 316 / 316L Square TubeASTM A554 · ASTM A554 / EN 10219 · Manufacturer, stockist & exporter, India
AISI 316L · UNS S31603
An SS 316 / 316L square tube is square hollow section, made from SS 316 / 316L to ASTM A554 (ornamental) · A312 / A790 for pressure. Square tube is used for frames, handrails, architecture and structures.
- ASTM A554
- ASTM A554 / EN 10219
- EN 10204 3.1 / 3.2
- Export packing
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
What is an SS 316 / 316L Square Tube?
- What it is
- Square hollow section
- Material
- ASTM A554 (ornamental) · A312 / A790 for pressure
- Dimensions
- ASTM A554 / EN 10219
- Grade
- SS 316 / 316L · UNS S31603
- Best at
- Chloride-bearing process fluids, marine air and pharmaceutical service
SS 316 / 316L Square Tube Specification
| Product | SS 316 / 316L Square Tube |
|---|---|
| Material standard | ASTM A554 (ornamental) · A312 / A790 for pressure |
| Dimensional standard | ASTM A554 / EN 10219 |
| Sizes | OD × wall to order |
| Length | Random, double random or cut lengths |
| Testing | PMI · dimensional · NDT and IGC on request |
| Documents | EN 10204 3.1 · 3.2 with third-party inspection |
When to Choose a Square Tube
Square tube is used for frames, handrails, architecture and structures.
- Square hollow section
- Polished or mill finish
- Cut lengths
More on choosing: Square tube guide.
SS 316 / 316L Square Tube: Why 316L for square tubes
Square tube is used for frames, handrails, architecture and structures. In SS 316 / 316L, the choice usually comes down to the medium and temperature — the rows here are the points buyers check for this exact combination.
| Why this grade | Stainless tubulars are the default for corrosive and hygienic service. SS 316 / 316L is picked for chloride-bearing process fluids, marine air and pharmaceutical service. |
|---|---|
| Typical service | Chemical & process — Piping and vessels handling mild acids and chlorides. |
| Welding to carbon steel | ER309L (or E309L electrode) is the usual filler when joining it to carbon steel |
| Matching filler | ER316L (AWS A5.9) |
SS 316 / 316L Square Tube Chemical Composition
| Element | Weight % |
|---|---|
| Chromium | 16.0 – 18.0 |
| Nickel | 10.0 – 14.0 |
| Molybdenum | 2.00 – 3.00 |
| Carbon | 0.030 max |
| Manganese | 2.00 max |
| Silicon | 0.75 max |
| Nitrogen | 0.10 max |
| Phosphorus | 0.045 max |
SS 316 / 316L Square Tube Mechanical Properties
| Annealed plate & sheet (316L) | Value |
|---|---|
| Tensile strength | 485 MPa · 70 ksi |
| Yield strength 0.2% | 170 MPa · 25 ksi |
| Elongation | 40% |
| Hardness | 217 HB max |
Full chemistry, properties and equivalents are on the SS 316 / 316L grade page.
Standards on this page
Other SS 316 / 316L pipes & tubes
SS 316 / 316L Square Tubes for export
FOB / CIF · Nhava Sheva (JNPT), MumbaiSS 316 / 316L Square Tube — questions buyers ask
What finishes are available on square tube?
Mill finish, 180–320 grit polish and hairline, depending on grade.
Can SS 316 / 316L square tubes be welded to carbon steel?
Yes — ER309L (or E309L electrode) is the usual filler when joining it to carbon steel.
Which standard covers SS 316 / 316L square tubes?
The material is ASTM A554 (ornamental) · A312 / A790 for pressure; dimensions follow ASTM A554 / EN 10219. Always state both on your purchase order, with the edition if your project specifies one.
What decides the price of a SS 316 / 316L square tube?
The alloy price, the size and dimensions, quantity, and the testing and documents required. Send your list and we quote the same working day.
What documents do you supply?
EN 10204 3.1 mill certificates as standard, 3.2 with third-party inspection on request, plus dimensional and PMI reports.
Sources: the ASTM / ASME specifications named on this page and producer datasheets · Last updated October 2026