UNS N10276 · ASTM B366
Hastelloy C276 pipe fittings are the tungsten-bearing nickel-molybdenum-chromium grade already specified on this site for reducing acids, wet chlorides, and as-welded chemical service. This is the commercial RFQ landing for that grade. It is not an Inconel 625 page and it is not a Monel 400 page.
Designations, chemistry, and mechanical figures below are those already published on the C276 overview article. This page does not add mill stock, NACE, ISO year, or a size range copied from Inconel 625.
Why specify C276 instead of Inconel 625
Inconel 625 (UNS N06625) on this site is a niobium-stabilised grade with 8–10% molybdenum, used where heat and chloride pitting dominate. C276 uses 15–17% molybdenum plus 3–4.5% tungsten and 0.010 max carbon so weld heat-affected zones stay usable in reducing acids. If the isometric calls for 625, use the 625 fittings page.
- UNS N10276 · 2.4819
- Mo 15–17% · W 3–4.5%
- C 0.010 max · no Nb table
- Reducing acids, wet chlorides, FGD
- UNS N06625 · 2.4856
- Mo 8–10% · Nb+Ta 3.15–4.15%
- Ni 58% min · C 0.10 max
- Heat + chloride service
- UNS N04400 · 2.4360
- Ni 63% min · Cu 28–34%
- No Mo / W table on that page
- Seawater and hydrofluoric service
Chemical composition (UNS N10276)
| Element | C | Mn | Si | Co | S | Ni | Cr | Fe | Mo | W | V | P |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| C276 | 0.010 max | 1.0 max | 0.08 max | 2.5 max | 0.03 max | Bal | 14.5–16.5 | 4–7 | 15–17 | 3–4.5 | 0.35 max | 0.04 max |
Equivalent designations
| Standard | Werkstoff | UNS | GOST | JIS | EN | OR |
|---|---|---|---|---|---|---|
| Alloy C276 | 2.4819 | N10276 | ХН65МВУ | NW 0276 | NiMo16Cr15W | ЭП760 |
AFNOR and BS cells on the overview article are blank. They stay blank here.
Mechanical properties
| Density | Melting point | Tensile | Yield (0.2%) | Elongation |
|---|---|---|---|---|
| 8.89 g/cm³ | 1370 °C (2500 °F) | 790 MPa (115,000 psi) | 355 MPa (52,000 psi) | 40% |
Forms named for C276 fittings
The C276 overview names buttweld fittings and forged / socket-weld / threaded fittings. Buttweld follows ASME B16.9 / B16.28 / MSS-SP-43 with the schedules listed on that article (5s through XXS). Forged classes 3000 / 6000 / 9000 are listed there at ¼″–4″ NB. Send the NPS, schedule or class, and quantity on the RFQ — do not assume an Inconel 625 size band.
Buttweld (B16.9 family)
Elbow, tee, reducer, cap, and stub end — the same type URLs as the buttweld hub, specified in C276.
Forged / socket / threaded
The overview also names socket-weld, threaded, coupling, union, cross, plug, and bushing. Those sit on the forged-fittings hub — not a second C276 URL.
Composition narrative and purchasing notes stay on the C276 overview article.
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Tell us the buying spec. A name-and-email note is not enough for a mill-test or fabrication reply.
- Product — Hastelloy C276 pipe fittings (ASTM B366)
- Form — buttweld type or forged / socket / threaded
- Size / NPS
- Class, schedule, or rating
- Quantity
- Drawing or isometric, if you have one
No stock quantity, country list, NACE, or delivery promise is implied. Reply is quoted per enquiry.
Related: buttweld fittings, Inconel 625 pipe fittings, Monel 400 buttweld fittings, C276 composition article.