ASTM A335 P11 Expander FlangeASTM A182 · ASME B16.5 (flange end) · Manufacturer, stockist & exporter, India
SA-335 P11 · 1¼Cr-½Mo alloy pipe · EXP
An ASTM A335 P11 expander flange is a weld neck flange whose hub increases the pipe size, for use with ASTM A335 P11 pipe. ASTM A335 P11 itself is a pipe or plate specification, so the matching expander flange is made to ASTM A182 F11 — which is what we supply for P11 lines. Expander flanges step up the line size at a pump or valve outlet, replacing a reducer and a standard weld neck flange with one part.
- 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 P11 Expander Flange?
- What it is
- A weld neck flange whose hub increases the pipe size
- Material
- ASTM A182 F11
- Dimensions
- ASME B16.5 (flange end)
- Grade
- ASTM A335 P11
- Best at
- Steam and hot-oil piping up to about 550 °C
ASTM A335 P11 Expander Flange Specification
| Product | ASTM A335 P11 Expander Flange |
|---|---|
| Material standard | ASTM A182 F11 |
| 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 an Expander Flange
Expander flanges step up the line size at a pump or valve outlet, replacing a reducer and a standard weld neck flange with one part.
- Increases one or two pipe sizes
- Saves a weld and space
- Weld neck design
ASTM A335 P11 Expander Flange 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 Expander 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 P11 grade page.
Other ASTM A335 P11 flanges
ASTM A335 P11 Expander Flanges for export
FOB / CIF · Nhava Sheva (JNPT), MumbaiASTM A335 P11 Expander Flange — questions buyers ask
When is an expander flange used?
Most often at pump and valve outlets where the line size increases immediately.
Which standard covers ASTM A335 P11 expander flanges?
The material is ASTM A182 F11; 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 P11 expander 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