ASTM A335 P11 Pipe & TubeSA-335 P11 · Manufacturer, stockist & exporter, India
Also sold as SA-335 P11 · 1¼Cr-½Mo alloy pipe · UNS K11597
ASTM A335 P11 pipe is supplied seamless to ASTM A335 P11, in ASME pipe sizes and schedules, with tube to ASTM A335 P11. It is a chrome-moly alloy steel pipe for high-temperature service, chosen for steam and hot-oil piping up to about 550 °C. Kanak Steel & Engineering Co. supplies it with EN 10204 3.1 mill certificates from Mumbai to buyers across India, the Gulf, South-East Asia, South America, Europe, the UK and the USA.
- Stock & mill supply
- EN 10204 3.1 / 3.2
- Mill test certificates
- Export packing
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
What is ASTM A335 P11 Pipe & Tube?
ASTM A335 P11 pipe & tube is a chrome-moly alloy steel pipe for high-temperature service supplied as pipe & tube to ASTM A335 P11. Buyers specify it for steam and hot-oil piping up to about 550 °C. It is also sold as SA-335 P11, 1¼Cr-½Mo alloy pipe, UNS K11597.
- What it is
- Chrome-moly alloy steel pipe for high-temperature service
- Seamless
- ASTM A335 P11
- Welded
- —
- Sizes
- NPS ⅛" – 24" · OD tube to order
- Schedules
- 5S · 10S · 40S · 80S · 160 · XXS
- Best at
- Steam and hot-oil piping up to about 550 °C
ASTM A335 P11 Pipe & Tube Specification & Sizes
| Seamless pipe | ASTM A335 P11 |
|---|---|
| Welded pipe | On request |
| Tube | — |
| Grade | ASTM A335 P11 |
| Size & schedule | NPS ⅛" to 24" to ASME B36.19 / B36.10; OD × wall for tube |
| Length | Single random, double random, or cut lengths |
| Ends | Plain end · bevelled end (for welding) · threaded |
| Testing | Hydrostatic · NDT · chemical & mechanical per heat · impact tests where specified |
| Documents | EN 10204 3.1 · 3.2 with third-party inspection |
ASTM A335 P11 Pipe: Seamless, Welded or Tube?
Three different specifications cover P11 tubular products. Pick the route first — it decides price, test requirements and lead time. General requirements (tolerances, hydrostatic or electric testing) come from ASTM A530. Schedules, the −12.5% wall tolerance and the B31.3 wall formula are explained in the pipe guide.
| Route | Specification | Use it for |
|---|---|---|
| Seamless pipe | ASTM A335 P11 | Pressure and critical service; no weld seam to inspect. |
| Welded pipe | Not usual for this grade | Economical in larger diameters and thinner walls where the code allows it. |
| Tube | — | Heat exchangers and instruments; ordered by exact OD × wall. |
ASTM A335 P11 Pipe & 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 Pipe & 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.
Density & Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Melting range | 1420 – 1530 °C |
| Magnetic | Magnetic |
ASTM A335 P11 Equivalent Grades
ASTM A335 P11 Pipe Weight Chart (kg/m)
Weight per metre (kg/m) = (OD − WT) × WT × 0.02466, with OD and wall thickness in mm. The factor comes from ASTM A335 P11's density of 7.85 g/cm³.
Example: 4" Sch 40S (114.30 × 6.02 mm)
(114.30 − 6.02) × 6.02 × 0.02466 = 16.08 kg/m
| NPS | OD mm | Sch 10S kg/m | Sch 40S kg/m |
|---|---|---|---|
| ½" | 21.34 | 1.00 | 1.27 |
| 1" | 33.40 | 2.09 | 2.50 |
| 2" | 60.33 | 3.93 | 5.44 |
| 3" | 88.90 | 6.46 | 11.29 |
| 4" | 114.30 | 8.37 | 16.08 |
| 6" | 168.28 | 13.83 | 28.26 |
| 8" | 219.08 | 19.97 | 42.55 |
Six-digit Harmonized System heading (iron and steel, chapter 72–73). Your country adds its own digits — confirm with your customs broker. All HS codes.
ASTM A335 P11 Pipe & Tube Price — What Decides It
Two quotes for "P11 pipe & tube" can differ by 20% and both be fair. We quote P11 pipe & tube per kg for full sizes and per piece for cut sizes. These six things move the price per kg, so you can compare offers like for like.
ASTM A335 P11 Pipe & Tube Applications
ASTM A335 P11 is specified when the cheaper grade will not survive the service but a higher alloy would be more than the job needs. These are the jobs our buyers use it for.
How your P11 pipe & tube order runs
- 01Enquiry review — we confirm size, standard edition and documents against your MR or drawing.
- 02Heat selection & PMI — the mill certificate is checked against your order; PMI before processing is available on request.
- 03Processing — cutting, machining or bevelling to your specification, with heat numbers marked.
- 04Inspection — your third-party inspector witnesses, or we share photos and test reports.
- 05Packing & dispatch — seaworthy packing from Nhava Sheva (JNPT), Mumbai, FOB or CIF, documents sent before the vessel sails.
Welding & Fabricating ASTM A335 P11 Pipe & Tube
ASTM A335 P11 welds by all common arc processes. A few points our buyers ask about:
| Matching filler | ER80S-B2 / E8018-B2 |
|---|---|
| Over-alloyed filler | Preheat and PWHT per ASME B31.1 / B31.3 |
| Preheat | As required by the WPS and code for the thickness |
| Cutting | Thermal or abrasive cutting; grind off heat-tinted edges before welding |
Follow your approved WPS; this is general guidance. See also P11 fittings and P11 flanges for the matching pipe-system parts.
How to Order ASTM A335 P11 Pipe & Tube: RFQ Checklist
Get an accurate quote the first time. Copy this list into your enquiry:
- Seamless or welded, and the standard
- NPS and schedule (or OD × wall for tube)
- Length — random or cut, and number of lengths
- End finish — plain, bevelled or threaded
- Certificate type and extra tests
- Delivery port, Incoterm and required date
ASTM A335 P11 pipe & tube for export
FOB / CIF · Nhava Sheva (JNPT), MumbaiASTM A335 P11 pipe & tube — questions buyers ask
Is ASTM A335 P11 the same as SA-335 P11?
SA-335 P11, 1¼Cr-½Mo alloy pipe, UNS K11597 are names used for ASTM A335 P11, and pipe & tube is ordered to ASTM A335 P11 whichever name is on the enquiry.
What is the difference between ASTM A335 P11 pipe and tube?
Pipe is ordered by nominal pipe size and schedule, for carrying fluids. Tube is ordered by exact outside diameter and wall, for heat exchangers and instruments, and is held to tighter tolerances.
Seamless or welded ASTM A335 P11 pipe — which should I buy?
Seamless (ASTM A335 P11) is the default for pressure and critical service. Welded is cheaper in larger diameters and thinner walls and is accepted where the design code allows it.
What is the wall-thickness tolerance on ASTM A335 P11 pipe?
Seamless pipe is normally allowed −12.5% on nominal wall under its general-requirements standard (ASTM A530). Allow for it in the pressure calculation or order on minimum wall.
Can ASTM A335 P11 pipe be welded to carbon-steel pipe?
Yes, with the right filler: matching carbon or low-alloy filler is used; joints to stainless need ER309L. Follow a qualified WPS.
Sources: the ASTM / ASME specifications named on this page and producer datasheets · Last updated October 2026