ASTM A335 P22 Threaded FlangeASTM A182 · ASME B16.5 · Manufacturer, stockist & exporter, India
SA-335 P22 · 2¼Cr-1Mo alloy pipe · THD
An ASTM A335 P22 threaded flange is a flange with a tapered internal thread that screws onto threaded pipe, for use with ASTM A335 P22 pipe. ASTM A335 P22 itself is a pipe or plate specification, so the matching threaded flange is made to ASTM A182 F22 — which is what we supply for P22 lines. Use a threaded flange where welding is not allowed — for example in explosive areas — on small-bore, low-pressure lines. Threads are NPT to ASME B1.20.1.
- ASTM A182
- ASME B16.5
- 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 P22 Threaded Flange?
- What it is
- A flange with a tapered internal thread that screws onto threaded pipe
- Material
- ASTM A182 F22
- Dimensions
- ASME B16.5 · ASME B1.20.1
- Grade
- ASTM A335 P22
- Best at
- High-pressure steam and hydrogen service up to about 580 °C
ASTM A335 P22 Threaded Flange Specification
| Product | ASTM A335 P22 Threaded Flange |
|---|---|
| Material standard | ASTM A182 F22 |
| Dimensional standard | ASME B16.5 · ASME B1.20.1 |
| Sizes | ½" – 24" (ASME B16.5) · 26" – 60" (ASME B16.47) |
| Pressure class | Class 150, 300, 400, 600, 900, 1500, 2500 · PN 6 – PN 100 |
| Facing | RF · FF · RTJ · tongue & groove |
| Bore | To match pipe schedule (state on order) |
| Testing | Chemical & mechanical per heat · NDT · impact where specified |
| Documents | EN 10204 3.1 · 3.2 with third-party inspection |
When to Choose a Threaded Flange
Use a threaded flange where welding is not allowed — for example in explosive areas — on small-bore, low-pressure lines. Threads are NPT to ASME B1.20.1.
- NPT threads to ASME B1.20.1
- Not for cyclic or high-temperature service
- Seal-welding is sometimes added after make-up
More on choosing: Threaded flange guide.
ASTM A335 P22 Threaded Flange: Why P22 for threaded flanges
Use a threaded flange where welding is not allowed — for example in explosive areas — on small-bore, low-pressure lines. Threads are NPT to ASME B1.20.1. In ASTM A335 P22, 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 and low-alloy flanges carry most utility, hydrocarbon and high-temperature service. ASTM A335 P22 is picked for high-pressure steam and hydrogen service up to about 580 °C. |
|---|---|
| Typical service | Power plants — High-pressure steam lines. |
| B16.5 material group | 1.10 — Group 1.10 applies to A182 F22 Class 3. Chrome-moly welds usually need PWHT; the code sets thickness exemptions. |
| Bolting | ASTM A193 B7 studs with A194 2H nuts; B16 with Gr 4 or 7 nuts where the temperature calls for it |
| Welding to carbon steel | Matching carbon or low-alloy filler is used; joints to stainless need ER309L |
| Matching filler | ER90S-B3 / E9018-B3 |
ASTM A335 P22 Threaded Flange 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 Threaded Flange Mechanical Properties
| Minimum values | Value |
|---|---|
| Tensile strength | 415 MPa · 60 ksi |
| Yield strength 0.2% | 205 MPa · 30 ksi |
| Elongation | 30% |
Full chemistry, properties and equivalents are on the ASTM A335 P22 grade page.
Other ASTM A335 P22 flanges
ASTM A335 P22 Threaded Flanges for export
FOB / CIF · Nhava Sheva (JNPT), MumbaiASTM A335 P22 Threaded Flange dimensions — ASME B16.5 Class 150 & 300
Outside diameter, thickness and bolting are set by 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.
ASTM A335 P22 Threaded Flange — questions buyers ask
Can threaded flanges be used in high-pressure service?
They are rated like other flanges in their class, but threaded joints are not recommended for cyclic, high-temperature or highly corrosive service.
What pressure rating does a ASTM A335 P22 threaded flange have?
It depends on class and temperature. ASTM A335 P22 forgings are in ASME B16.5 material group 1.10; read your class column in that group's table at the design temperature.
Can ASTM A335 P22 threaded flanges be welded to carbon steel?
Yes — matching carbon or low-alloy filler is used; joints to stainless need ER309L.
Which standard covers ASTM A335 P22 threaded flanges?
The material is ASTM A182 F22; dimensions follow ASME B16.5 · ASME B1.20.1. Always state both on your purchase order, with the edition if your project specifies one.
What decides the price of a ASTM A335 P22 threaded flange?
The steel price, the size and pressure class, 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 mill certificates as standard, 3.2 with third-party inspection on request, plus dimensional and PMI reports.
Sources: the ASTM / ASME specifications named on this page and producer datasheets · Last updated October 2026