ASTM A335 P11 Pipe FittingsASTM A234 WP11 · Manufacturer, stockist & exporter, India
Also sold as SA-335 P11 · 1¼Cr-½Mo alloy pipe · UNS K11597
ASTM A335 P11 pipe fittings are made to ASTM A234 WP11 for buttweld fittings and ASTM A182 F11 for forged socket-weld and threaded fittings, with dimensions to ASME B16.9 and B16.11. 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 Fittings?
ASTM A335 P11 pipe fittings is a chrome-moly alloy steel pipe for high-temperature service supplied as pipe fittings to ASTM A234 WP11. 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
- Buttweld
- ASTM A234 WP11
- Forged
- ASTM A182 F11
- Dimensions
- ASME B16.9 · B16.11 · MSS SP-43
- Sizes
- Buttweld ½" – 48" · forged ⅛" – 4"
- Best at
- Steam and hot-oil piping up to about 550 °C
ASTM A335 P11 Pipe Fittings Specification & Sizes
| Buttweld fittings | ASTM A234 WP11 — dimensions to ASME B16.9, MSS SP-43 |
|---|---|
| Forged fittings | ASTM A182 F11 — dimensions to ASME B16.11 |
| Short-radius elbows | ASME B16.28 |
| Buttweld sizes | NPS ½" to 48", schedule to match the pipe |
| Forged classes | Socket weld 3000 / 6000 / 9000 · threaded 2000 / 3000 / 6000 |
| Types | Elbow · Tee · Reducer · Cap · Stub end · Cross · Bend · Lateral · Coupling · Union · Nipple · Plug |
| Testing | PMI · dimensional · radiography of welded fittings · IGC on request |
| Documents | EN 10204 3.1 · 3.2 with third-party inspection |
Standards on this page
ASTM A335 P11 Pipe Fittings Chemical Composition
| Element | Weight % |
|---|---|
| Chromium | 1.00 – 1.50 |
| Molybdenum | 0.44 – 0.65 |
| Carbon | 0.05 – 0.15 |
| Manganese | 0.30 – 0.60 |
| Silicon | 0.50 – 1.00 |
| Phosphorus | 0.025 max |
| Sulphur | 0.025 max |
ASTM A335 P11 Pipe Fittings Mechanical Properties
| Minimum values | Value |
|---|---|
| Tensile strength | 415 MPa · 60 ksi |
| Yield strength 0.2% | 205 MPa · 30 ksi |
| Elongation | 30% |
Density & Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Melting range | 1420 – 1530 °C |
| Magnetic | Magnetic |
ASTM A335 P11 Equivalent Grades
Values follow ASTM A335 Grade P11. Always check against the edition named on your purchase order.
ASTM A335 P11 buttweld fitting dimensions — ASME B16.9
Centre-to-end and end-to-end dimensions are the same for every alloy; the wall thickness follows the pipe schedule. Values in mm.
| NPS | OD | 90° LR elbow A | 45° elbow B | Tee C | Reducer H | Cap E |
|---|---|---|---|---|---|---|
| ½" | 21.3 | 38 | 16 | 25 | — | 25 |
| 1" | 33.4 | 38 | 22 | 38 | 51 | 38 |
| 1½" | 48.3 | 57 | 29 | 57 | 64 | 38 |
| 2" | 60.3 | 76 | 35 | 64 | 76 | 38 |
| 3" | 88.9 | 114 | 51 | 86 | 89 | 51 |
| 4" | 114.3 | 152 | 64 | 105 | 102 | 64 |
| 6" | 168.3 | 229 | 95 | 143 | 140 | 89 |
| 8" | 219.1 | 305 | 127 | 178 | 152 | 102 |
| 10" | 273.1 | 381 | 159 | 216 | 178 | 127 |
| 12" | 323.9 | 457 | 190 | 254 | 203 | 152 |
Full chart to 24": ASME B16.9 fitting dimensions.
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 Fittings Price — What Decides It
Two quotes for "P11 pipe fittings" can differ by 20% and both be fair. We quote P11 pipe fittings 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 fittings by type
ASTM A335 P11 Pipe Fittings 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 fittings order runs
- 01Enquiry review — we confirm size, standard edition and documents against your MR or drawing.
- 02Heat selection & PMI — the mill certificate is checked and material is PMI-tested before processing.
- 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.
Standards on this page
Welding & Fabricating ASTM A335 P11 Pipe Fittings
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 | Plasma or waterjet; 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 Fittings: RFQ Checklist
Get an accurate quote the first time. Copy this list into your enquiry:
- Fitting type, size and schedule / class
- Buttweld, socket weld or threaded
- Seamless or welded (buttweld fittings)
- Material standard and grade marking
- Certificate type and extra tests
- Delivery port, Incoterm and required date
ASTM A335 P11 pipe fittings for export
FOB / CIF · Nhava Sheva (JNPT), MumbaiASTM A335 P11 pipe fittings — questions buyers ask
Is ASTM A335 P11 the same as SA-335 P11?
Yes. SA-335 P11, 1¼Cr-½Mo alloy pipe, UNS K11597 all refer to the same material, and pipe fittings is ordered to ASTM A234 WP11 whichever name is on the enquiry.
Which standard covers ASTM A335 P11 buttweld fittings?
ASTM A234 WP11 is the material specification; dimensions follow ASME B16.9 (and MSS SP-43 for light-wall fittings). Forged socket-weld and threaded fittings are made from ASTM A182 F11 material to ASME B16.11.
Buttweld or socket weld — which do I need?
Buttweld fittings suit ½" and larger lines and full-penetration welds. Socket-weld and threaded fittings suit small-bore lines, usually 2" and under.
Can you supply a mixed list of fittings?
Yes. Send the full material requisition and we quote line by line with delivery for each item.
What documents come with the fittings?
An EN 10204 3.1 certificate for each heat, dimensional report and PMI report; 3.2 with a third-party inspector on request.
Sources: the ASTM / ASME specifications named on this page and producer datasheets · Last updated October 2026