SS 310 / 310S Round TubeASTM A213 · Tube specification · Manufacturer, stockist & exporter, India
AISI 310S · UNS S31008
An SS 310 / 310S round tube is tube ordered by exact OD and wall thickness, made from SS 310 / 310S to ASTM A213. Round tube is used for heat exchangers, boilers and instruments, with tighter tolerances than pipe.
- ASTM A213
- Tube specification
- EN 10204 3.1 / 3.2
- Export packing
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
What is an SS 310 / 310S Round Tube?
- What it is
- Tube ordered by exact OD and wall thickness
- Material
- ASTM A213
- Dimensions
- Tube specification
- Grade
- SS 310 / 310S · UNS S31008
- Best at
- Furnaces, burners and heat treatment at high temperature
SS 310 / 310S Round Tube Specification
| Product | SS 310 / 310S Round Tube |
|---|---|
| Material standard | ASTM A213 |
| Dimensional standard | Tube specification |
| 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 Round Tube
Round tube is used for heat exchangers, boilers and instruments, with tighter tolerances than pipe.
- OD × wall ordering
- Seamless or welded
- Straight or U-bent
More on choosing: Round tube guide.
SS 310 / 310S Round Tube: Why 310S for round tubes
Round tube is used for heat exchangers, boilers and instruments, with tighter tolerances than pipe. In SS 310 / 310S, 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 310 / 310S is picked for furnaces, burners and heat treatment at high temperature. |
|---|---|
| Typical service | Furnace parts — Muffles, retorts, radiant tubes and conveyor belts. |
| Welding to carbon steel | ER309L (or E309L electrode) is the usual filler when joining it to carbon steel |
| Matching filler | ER310 (AWS A5.9) |
SS 310 / 310S Round Tube Chemical Composition
| Element | Weight % |
|---|---|
| Chromium | 24.0 – 26.0 |
| Nickel | 19.0 – 22.0 |
| Carbon | 0.08 max |
| Manganese | 2.00 max |
| Silicon | 1.50 max |
| Phosphorus | 0.045 max |
| Sulphur | 0.030 max |
| Iron | Balance |
SS 310 / 310S Round Tube Mechanical Properties
| Annealed plate & sheet | Value |
|---|---|
| Tensile strength | 515 MPa · 75 ksi |
| Yield strength 0.2% | 205 MPa · 30 ksi |
| Elongation | 40% |
| Hardness | 217 HB max |
Full chemistry, properties and equivalents are on the SS 310 / 310S grade page.
Other SS 310 / 310S pipes & tubes
SS 310 / 310S Round Tubes for export
FOB / CIF · Nhava Sheva (JNPT), MumbaiSS 310 / 310S Round Tube — questions buyers ask
What is the difference between tube and pipe?
Tube is specified by exact OD and wall; pipe by nominal size and schedule.
Can SS 310 / 310S round 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 310 / 310S round tubes?
The material is ASTM A213; dimensions follow Tube specification. Always state both on your purchase order, with the edition if your project specifies one.
What decides the price of a SS 310 / 310S round 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