Hastelloy C276 Orifice FlangeASTM B462 · ASME B16.36 · Manufacturer, stockist & exporter, India
Alloy C-276 · UNS N10276 · ORF
A Hastelloy C276 orifice flange is a pair of weld neck or slip-on flanges with pressure taps that hold an orifice plate, made from Hastelloy C276 to ASTM B462 / B564. Orifice flanges are used for flow measurement. Each flange has two ½" NPT pressure-tap holes, and jack screws help separate the pair to change the plate.
- ASTM B462
- ASME B16.36
- EN 10204 3.1 / 3.2
- Export packing
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
What is a Hastelloy C276 Orifice Flange?
- What it is
- A pair of weld neck or slip-on flanges with pressure taps that hold an orifice plate
- Material
- ASTM B462 / B564
- Dimensions
- ASME B16.36
- Grade
- Hastelloy C276 · UNS N10276
- Best at
- The most aggressive mixed acids, wet chlorine and hypochlorite
Hastelloy C276 Orifice Flange Specification
| Product | Hastelloy C276 Orifice Flange |
|---|---|
| Material standard | ASTM B462 / B564 |
| Dimensional standard | ASME B16.36 |
| Sizes | 1" – 24" (ASME B16.36) |
| Pressure class | Class 300 – 2500 |
| Facing | RF · FF · RTJ · tongue & groove |
| Bore | To match pipe schedule (state on order) |
| Testing | PMI · dimensional · NDT and IGC on request |
| Documents | EN 10204 3.1 · 3.2 with third-party inspection |
When to Choose an Orifice Flange
Orifice flanges are used for flow measurement. Each flange has two ½" NPT pressure-tap holes, and jack screws help separate the pair to change the plate.
- Class 300 minimum per ASME B16.36
- Supplied in pairs with jack screws
- Pressure taps: ½" NPT, two per flange
More on choosing: Orifice flange guide.
Hastelloy C276 Orifice Flange: Why C276 for orifice flanges
Orifice flanges are used for flow measurement. Each flange has two ½" NPT pressure-tap holes, and jack screws help separate the pair to change the plate. In Hastelloy C276, 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 | Nickel-alloy flanges are used where acids, chlorides or heat defeat stainless. Hastelloy C276 is picked for the most aggressive mixed acids, wet chlorine and hypochlorite. |
|---|---|
| Typical service | Chemical processing — Reactors, heat exchangers and piping for mixed acids. |
| B16.5 material group | 3.8 |
| Bolting | B7 (coated), B8M or nickel-alloy studs such as Hastelloy C276 from ASTM B574, as the project specifies |
| Welding to carbon steel | A nickel-base filler such as ERNiCr-3 (or ERNiCrMo-3) is used when joining it to carbon steel |
| Matching filler | ERNiCrMo-4 (AWS A5.14) |
| Sour service | Listed in NACE MR0175 / ISO 15156-3 within its limits — state it on the order |
Hastelloy C276 Orifice Flange Chemical Composition
| Element | Weight % |
|---|---|
| Nickel | Balance |
| Molybdenum | 15.0 – 17.0 |
| Chromium | 14.5 – 16.5 |
| Iron | 4.0 – 7.0 |
| Tungsten | 3.0 – 4.5 |
| Cobalt | 2.5 max |
| Carbon | 0.010 max |
| Manganese | 1.0 max |
Hastelloy C276 Orifice Flange Mechanical Properties
| Solution-annealed plate & sheet | Value |
|---|---|
| Tensile strength | 690 MPa · 100 ksi |
| Yield strength 0.2% | 283 MPa · 41 ksi |
| Elongation | 40% |
Full chemistry, properties and equivalents are on the Hastelloy C276 grade page.
Standards on this page
Other Hastelloy C276 flanges
Hastelloy C276 Orifice Flanges for export
FOB / CIF · Nhava Sheva (JNPT), MumbaiHastelloy C276 Orifice Flange — questions buyers ask
Why is the minimum class 300 for orifice flanges?
ASME B16.36 starts at Class 300 so the flange is thick enough to drill the pressure taps radially.
What pressure rating does a Hastelloy C276 orifice flange have?
It depends on class and temperature. Hastelloy C276 forgings are in ASME B16.5 material group 3.8; read your class column in that group's table at the design temperature.
Can Hastelloy C276 orifice flanges be welded to carbon steel?
Yes — a nickel-base filler such as ERNiCr-3 (or ERNiCrMo-3) is used when joining it to carbon steel.
Which standard covers Hastelloy C276 orifice flanges?
The material is ASTM B462 / B564; dimensions follow ASME B16.36. Always state both on your purchase order, with the edition if your project specifies one.
What decides the price of a Hastelloy C276 orifice flange?
The alloy price, the size and pressure class, quantity, and the testing and documents required. Send your list and we quote the same working day.
Can you supply Hastelloy C276 orifice flanges to NACE MR0175?
Yes. Hastelloy C276 is listed in NACE MR0175 / ISO 15156-3 within its limits; state NACE compliance on the order and it is confirmed on the certificate.
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