ASTM A335 P11 Round TubeASTM A335 · Tube specification · Manufacturer, trader & exporter, India
SA-335 P11 · 1¼Cr-½Mo alloy pipe
An ASTM A335 P11 round tube is tube ordered by exact OD and wall thickness, for use with ASTM A335 P11 service. ASTM A335 P11 itself is a pipe or plate specification, so the matching round tube is made to ASTM A335 P11 — which is what we supply for P11 lines. Round tube is used for heat exchangers, boilers and instruments, with tighter tolerances than pipe.
- ASTM A335
- 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 ASTM A335 P11 Round Tube?
- What it is
- Tube ordered by exact OD and wall thickness
- Material
- ASTM A335 P11
- Dimensions
- Tube specification
- Grade
- ASTM A335 P11
- Best at
- Steam and hot-oil piping up to about 550 °C
ASTM A335 P11 Round Tube Specification
| Product | ASTM A335 P11 Round Tube |
|---|---|
| Material standard | ASTM A335 P11 |
| Dimensional standard | Tube specification |
| Sizes | OD × wall to order |
| Length | Random, double random or cut lengths |
| Testing | Chemical & mechanical per heat · NDT · impact where specified |
| Documents | EN 10204 3.1 or 3.2 on request / as specified in the PO |
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.
ASTM A335 P11 Round Tube: Why P11 for round tubes
Round tube is used for heat exchangers, boilers and instruments, with tighter tolerances than pipe. In ASTM A335 P11, 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 | Carbon steel tubulars carry most hydrocarbon and utility service. ASTM A335 P11 is picked for steam and hot-oil piping up to about 550 °C. |
|---|---|
| Typical service | Power plants — Main steam and reheat lines. |
| Welding to carbon steel | Matching carbon or low-alloy filler is used; joints to stainless need ER309L |
| Matching filler | ER80S-B2 / E8018-B2 |
ASTM A335 P11 Round Tube Chemical Composition
Under technical review for TDS.
| Element | Current requirement |
|---|---|
| Chromium | As specified |
| Molybdenum | As specified |
| Carbon | As specified |
| Manganese | As specified |
| Silicon | As specified |
| Phosphorus | As specified |
| Sulphur | As specified |
Numerical specification requirements are published only after the applicable current standard edition has been verified. Governing specification to be verified: ASTM A335 Grade P11.
ASTM A335 P11 Round Tube Mechanical Properties
Under technical review for TDS.
| Property | Current requirement |
|---|---|
| Tensile strength | As specified |
| Yield strength 0.2% | As specified |
| Elongation | As specified |
Numerical specification requirements are published only after the applicable current standard edition has been verified. Governing specification and condition to be verified: ASTM A335 Grade P11 — condition per order.
Full chemistry, properties and equivalents are on the ASTM A335 P11 grade page.
Other ASTM A335 P11 pipes & tubes
ASTM A335 P11 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 ASTM A335 P11 round tubes be welded to carbon steel?
Yes — matching carbon or low-alloy filler is used; joints to stainless need ER309L.
Which standard covers ASTM A335 P11 round tubes?
The material is ASTM A335 P11; 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 ASTM A335 P11 round tube?
The steel 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 or 3.2 certificates available on request / as specified in the PO; dimensional reports as required. PMI can be arranged depending on product and requirements, as specified in the PO.
Sources: the ASTM / ASME specifications named on this page and producer datasheets · Last updated October 2026