ASTM A335 P22 Pipe FittingsASTM A234 WP22 · Manufacturer, trader & exporter, India
Also sold as SA-335 P22 · 2¼Cr-1Mo alloy pipe · UNS K21590
ASTM A335 P22 pipe fittings are made to ASTM A234 WP22 for buttweld fittings and ASTM A182 F22 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, high-pressure service, chosen for high-pressure steam and hydrogen service up to about 580 °C. Kanak Steel & Engineering Co. manufactures, trades and exports it from Mumbai; EN 10204 3.1 or 3.2 certificates are available on request / as specified in the PO. Markets we have supplied to include Oman, UAE, Saudi Arabia, Brazil, Argentina, Spain and Chile (India is the home market).
- 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 P22 Pipe Fittings?
ASTM A335 P22 pipe fittings is a chrome-moly alloy steel pipe for high-temperature, high-pressure service supplied as pipe fittings to ASTM A234 WP22. Buyers specify it for high-pressure steam and hydrogen service up to about 580 °C. It is also sold as SA-335 P22, 2¼Cr-1Mo alloy pipe, UNS K21590.
- What it is
- Chrome-moly alloy steel pipe for high-temperature, high-pressure service
- Buttweld
- ASTM A234 WP22
- Forged
- ASTM A182 F22
- Dimensions
- ASME B16.9 · B16.11 · MSS SP-43
- Sizes
- Buttweld ½" – 48" · forged ⅛" – 4"
- Best at
- High-pressure steam and hydrogen service up to about 580 °C
ASTM A335 P22 Pipe Fittings Specification & Sizes
| Buttweld fittings | ASTM A234 WP22 — dimensions to ASME B16.9, MSS SP-43 |
|---|---|
| Forged fittings | ASTM A182 F22 — dimensions to ASME B16.11 |
| Short-radius elbows | ASME B16.9 (formerly 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 |
Choosing ASTM A335 P22 Fittings: Elbow Radius, Schedule & Class
State seamless or welded, and the non-destructive examination you need on welds.
Radius (LR, SR, 3D), the schedule-to-class map and the 1.5 mm socket-weld gap are explained in the fittings guide. For P22, buttweld fittings are ASTM A234 WP22 and forged fittings ASTM A182 F22.
ASTM A335 P22 Pipe Fittings 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 P22.
ASTM A335 P22 Pipe Fittings 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 P22 — condition per order.
Density & Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Melting range | 1420 – 1530 °C |
| Magnetic | Magnetic |
ASTM A335 P22 Equivalent Grades
ASTM A335 P22 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 P22 Pipe Fittings Price — What Decides It
Two quotes for "P22 pipe fittings" can differ by 20% and both be fair. We quote P22 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 P22 pipe fittings by type
ASTM A335 P22 Pipe Fittings Applications
ASTM A335 P22 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 P22 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 against your order; PMI can be arranged depending on product and requirements, as specified in the PO.
- 03Processing — cutting, machining or bevelling to your specification, with heat numbers marked as specified in the PO.
- 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 P22 Pipe Fittings
ASTM A335 P22 welds by all common arc processes. A few points our buyers ask about:
| Matching filler | ER90S-B3 / E9018-B3 |
|---|---|
| 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 P22 fittings and P22 flanges for the matching pipe-system parts.
How to Order ASTM A335 P22 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 P22 pipe fittings — questions buyers ask
Is ASTM A335 P22 the same as SA-335 P22?
SA-335 P22, 2¼Cr-1Mo alloy pipe, UNS K21590 are names used for ASTM A335 P22, and pipe fittings is ordered to ASTM A234 WP22 whichever name is on the enquiry.
Which standard covers ASTM A335 P22 buttweld fittings?
ASTM A234 WP22 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 F22 material to ASME B16.11.
What is the difference between ASTM A335 P22 WP-S and WP-W fittings?
Seamless fittings are made from seamless pipe or bar; welded fittings are formed from plate or welded pipe. State which you need and the weld examination required.
Can ASTM A335 P22 fittings be welded to carbon steel?
Yes — matching carbon or low-alloy filler is used; joints to stainless need ER309L.
Sources: the ASTM / ASME specifications named on this page and producer datasheets · Last updated October 2026