ASTM A335 P22 FlangesASTM A182 F22 · Manufacturer, stockist & exporter, India
Also sold as SA-335 P22 · 2¼Cr-1Mo alloy pipe · UNS K21590
ASTM A335 P22 flanges are forged to ASTM A182 F22 and machined to ASME B16.5 (½"–24", Class 150–2500) or ASME B16.47 for larger sizes. 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. 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 P22 Flanges?
ASTM A335 P22 flanges is a chrome-moly alloy steel pipe for high-temperature, high-pressure service supplied as flanges to ASTM A182 F22. 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
- Material
- ASTM A182 F22
- Dimensions
- ASME B16.5 · B16.47 · EN 1092-1
- Classes
- 150 · 300 · 600 · 900 · 1500 · 2500
- Facing
- RF · FF · RTJ
- Best at
- High-pressure steam and hydrogen service up to about 580 °C
ASTM A335 P22 Flanges Specification & Sizes
| Material standard | ASTM A182 F22 |
|---|---|
| Dimensional standards | ASME B16.5 (½"–24") · B16.47 Series A / B (26"–60") · B16.36 orifice · B16.48 line blanks · EN 1092-1 |
| Pressure classes | Class 150, 300, 400, 600, 900, 1500, 2500 · PN 6 – PN 100 |
| Facing | Raised face (RF) · flat face (FF) · ring type joint (RTJ) · tongue & groove |
| Bore | To match the pipe schedule — specify it on the order |
| Types | Weld neck flange · Slip-on flange · Blind flange · Socket weld flange · Threaded flange · Lap joint flange · Long weld neck flange · Orifice flange · Spectacle blind · Reducing flange · Ring type joint flange · Expander flange · Anchor flange · Swivel ring flange |
| Testing | PMI · dimensional · UT of forgings · IGC on request |
| Documents | EN 10204 3.1 · 3.2 with third-party inspection |
Standards on this page
ASTM A335 P22 Flanges Chemical Composition
| Element | Weight % |
|---|---|
| Chromium | 1.90 – 2.60 |
| Molybdenum | 0.87 – 1.13 |
| Carbon | 0.05 – 0.15 |
| Manganese | 0.30 – 0.60 |
| Silicon | 0.50 max |
| Phosphorus | 0.025 max |
| Sulphur | 0.025 max |
ASTM A335 P22 Flanges 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 P22 Equivalent Grades
Values follow ASTM A335 Grade P22. Always check against the edition named on your purchase order.
ASTM A335 P22 flange dimensions — ASME B16.5 Class 150 & 300
Outside dimensions depend only on size and class, not on the alloy, so P22 flanges bolt to any B16.5 flange of the same size and class. Values in mm; thickness excludes the 1.6 mm raised face.
| NPS | Cl 150 OD | Cl 150 thickness | Cl 150 bolt circle | Cl 150 bolts | Cl 300 OD | Cl 300 thickness | Cl 300 bolt circle | Cl 300 bolts |
|---|---|---|---|---|---|---|---|---|
| ½" | 90 | 9.6 | 60.3 | 4 × ½" | 95 | 12.7 | 66.7 | 4 × ½" |
| 1" | 110 | 12.7 | 79.4 | 4 × ½" | 125 | 15.9 | 88.9 | 4 × ⅝" |
| 1½" | 125 | 15.9 | 98.4 | 4 × ½" | 155 | 19.1 | 114.3 | 4 × ¾" |
| 2" | 150 | 17.5 | 120.7 | 4 × ⅝" | 165 | 20.7 | 127.0 | 8 × ⅝" |
| 3" | 190 | 22.3 | 152.4 | 4 × ⅝" | 210 | 27.0 | 168.3 | 8 × ¾" |
| 4" | 230 | 22.3 | 190.5 | 8 × ⅝" | 255 | 30.2 | 200.0 | 8 × ¾" |
| 6" | 280 | 23.9 | 241.3 | 8 × ¾" | 320 | 35.0 | 269.9 | 12 × ¾" |
| 8" | 345 | 27.0 | 298.5 | 8 × ¾" | 380 | 39.7 | 330.2 | 12 × ⅞" |
| 10" | 405 | 28.6 | 362.0 | 12 × ⅞" | 445 | 46.1 | 387.4 | 16 × 1" |
| 12" | 485 | 30.2 | 431.8 | 12 × ⅞" | 520 | 49.3 | 450.8 | 16 × 1⅛" |
Full chart: ASME B16.5 flange 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 Flanges Price — What Decides It
Two quotes for "P22 flanges" can differ by 20% and both be fair. We quote P22 flanges 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 flanges by type
ASTM A335 P22 Flanges 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 flanges 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 P22 Flanges
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 | Plasma or waterjet; 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 Flanges: RFQ Checklist
Get an accurate quote the first time. Copy this list into your enquiry:
- Flange type and dimensional standard (B16.5 / B16.47 / EN 1092-1)
- Size, pressure class and facing
- Bore / schedule for weld neck and socket weld flanges
- Material standard and grade marking
- Certificate type and extra tests
- Delivery port, Incoterm and required date
ASTM A335 P22 flanges for export
FOB / CIF · Nhava Sheva (JNPT), MumbaiASTM A335 P22 flanges — questions buyers ask
Is ASTM A335 P22 the same as SA-335 P22?
Yes. SA-335 P22, 2¼Cr-1Mo alloy pipe, UNS K21590 all refer to the same material, and flanges is ordered to ASTM A182 F22 whichever name is on the enquiry.
Which standard covers ASTM A335 P22 flanges?
ASTM A182 F22 is the material specification for the forging; dimensions follow ASME B16.5 for ½"–24" and ASME B16.47 for 26" and above. European projects use EN 1092-1.
Which flange type should I choose?
Weld neck flanges suit high pressure, temperature and cyclic loads. Slip-on flanges are cheaper and easier to align for low-pressure service. Blind flanges close lines, and lap joint flanges with stub ends save alloy where the flange never touches the fluid.
What is the difference between RF and RTJ facing?
A raised face takes a flat or spiral-wound gasket and suits most service. A ring type joint face has a groove for a metal ring gasket and is used for high pressure and temperature.
Do you supply matching bolting and gaskets?
Yes — stud bolts, nuts and gaskets can be quoted with the flanges so the set arrives together.
Sources: the ASTM / ASME specifications named on this page and producer datasheets · Last updated October 2026