ASTM A335 P22 Long Weld Neck FlangeASTM A182 · ASME B16.5 (flange end) · Manufacturer, stockist & exporter, India
SA-335 P22 · 2¼Cr-1Mo alloy pipe · LWN
An ASTM A335 P22 long weld neck flange is a weld neck flange with an extended straight neck, used as a vessel nozzle, for use with ASTM A335 P22 pipe. ASTM A335 P22 itself is a pipe or plate specification, so the matching long weld neck flange is made to ASTM A182 F22 — which is what we supply for P22 lines. Long weld neck flanges are used as nozzles on vessels and columns, with the neck welded into the shell. Standard neck lengths are 9" and 12", or made to drawing.
- ASTM A182
- ASME B16.5 (flange end)
- 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 Long Weld Neck Flange?
- What it is
- A weld neck flange with an extended straight neck, used as a vessel nozzle
- Material
- ASTM A182 F22
- Dimensions
- ASME B16.5 (flange end)
- Grade
- ASTM A335 P22
- Best at
- High-pressure steam and hydrogen service up to about 580 °C
ASTM A335 P22 Long Weld Neck Flange Specification
| Product | ASTM A335 P22 Long Weld Neck Flange |
|---|---|
| Material standard | ASTM A182 F22 |
| Dimensional standard | ASME B16.5 (flange end) |
| 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 Long Weld Neck Flange
Long weld neck flanges are used as nozzles on vessels and columns, with the neck welded into the shell. Standard neck lengths are 9" and 12", or made to drawing.
- Heavy-barrel and equal-barrel designs
- Neck length 9" / 12" or to drawing
- Often machined from solid bar in alloys
More on choosing: Long weld neck flange guide.
ASTM A335 P22 Long Weld Neck Flange: Why P22 for long weld neck flanges
Long weld neck flanges are used as nozzles on vessels and columns, with the neck welded into the shell. Standard neck lengths are 9" and 12", or made to drawing. 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 Long Weld Neck 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 Long Weld Neck 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 Long Weld Neck Flanges for export
FOB / CIF · Nhava Sheva (JNPT), MumbaiASTM A335 P22 Long Weld Neck 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 Long Weld Neck Flange — questions buyers ask
What is the difference between equal-barrel and heavy-barrel LWN?
Equal-barrel has a uniform neck; heavy-barrel has a thicker neck for extra reinforcement at the vessel wall.
What pressure rating does a ASTM A335 P22 long weld neck 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 long weld neck 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 long weld neck flanges?
The material is ASTM A182 F22; dimensions follow ASME B16.5 (flange end). Always state both on your purchase order, with the edition if your project specifies one.
What decides the price of a ASTM A335 P22 long weld neck 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