Hastelloy / UNS N06455
Hastelloy® C-4 is a nickel-chromium-molybdenum alloy with outstanding high-temperature stability: it resists grain-boundary precipitation, so it stays ductile and corrosion resistant after exposure at 650–1,040 °C.
- UNS N06455
- W.Nr. 2.4610
- Spec ASTM B575
- Density 8.64 g/cm³
Also known as / equivalents
| System | Designation |
|---|---|
| UNS | N06455 |
| W.Nr. | 2.4610 |
| EN | NiMo16Cr16Ti |
| Also known as | C4, C-4, Alloy C-4, 2.4610, NiMo16Cr16Ti |
Chemical composition
| Element | Min % | Max % |
|---|---|---|
| Ni | Bal. | — |
| Cr | 14.0 | 18.0 |
| Mo | 14.0 | 17.0 |
| Fe | — | 3.0 |
| Ti | — | 0.70 |
| Co | — | 2.0 |
| C | — | 0.015 |
| Si | — | 0.08 |
| Mn | — | 1.0 |
| P | — | 0.04 |
| S | — | 0.03 |
Mechanical properties
| Property | Value |
|---|---|
| Tensile strength (min) | 690 MPa (100.1 ksi) |
| Yield strength, 0.2% offset (min) | 276 MPa (40.0 ksi) |
| Elongation in 50 mm (min) | 40 % |
Physical properties
| Property | Metric | Imperial |
|---|---|---|
| Density | 8.64 g/cm³ | 0.312 lb/in³ |
| Magnetic response | Non-magnetic | — |
Available forms & specifications
| Form | Specification | Size range |
|---|---|---|
| Sheets & plates | ASTM B575 / ASME SB575 (C-family), ASTM B333 (B-family) | 0.3 mm – 6 mm |
| Welded pipe | ASTM B619 | 1/8" – 24" NB |
| Seamless pipe & tube | ASTM B622 | 1/8" – 24" NB |
| Welded tube | ASTM B626 | 1/8" – 24" NB |
| Bars & rods | ASTM B574 (C-family), B335 (B-family) | 3 mm – 500 mm |
| Flanges & forgings | ASTM B564 / B462 | 1/2" – 48" NB (larger on request) |
| Buttweld fittings | ASTM B366 | 1/2" – 48" NB |
Corrosion & temperature resistance
The C-family resists pitting, crevice corrosion and stress-corrosion cracking in chlorides, wet chlorine, hypochlorite and mixed acids. The B-family is for pure reducing acids (HCl, H₂SO₄) and must not be used where ferric or cupric ions or oxidisers are present.
Applications
Hastelloy® C-4: Chemical plant parts exposed to high temperature. Chemical reactors, scrubbers and flue-gas desulphurisation, pulp and paper bleaching, pharmaceutical process equipment and acid handling.
Hastelloy® C-4 vs Hastelloy® C-276
| Hastelloy® C-4 | Hastelloy® C-276 | |
|---|---|---|
| UNS | N06455 | N10276 |
| Key property | Thermally stable C-alloy | Most versatile corrosion-resistant alloy |
| Typical use | Chemical plant parts exposed to high temperature | FGD, chemical reactors, pulp bleaching |
| Cr (wt %) | 14.0–18.0 | 14.5–16.5 |
| Ni (wt %) | Bal. | Bal. |
| Mo (wt %) | 14.0–17.0 | 15.0–17.0 |
| C (wt %) | ≤ 0.015 | ≤ 0.010 |
| Tensile / yield (min, MPa) | 690 / 276 | 690 / 283 |
Frequently asked questions
What is the UNS number of Hastelloy® C-4?
Hastelloy® C-4 is designated UNS N06455 (W.Nr. 2.4610, EN NiMo16Cr16Ti).
What is Hastelloy® C-4 used for?
Thermally stable C-alloy. Typical uses: chemical plant parts exposed to high temperature.
Is Hastelloy® C-4 magnetic?
Non-magnetic.
In which forms can I buy Hastelloy® C-4 from Rajkamal Metals?
Coils & Strips, Sheets & Plates, Pipes & Tubes, Round Bars & Rods, Flanges, Buttweld Fittings, Socket Weld & Threaded Fittings, Fasteners, Ferrule / Instrumentation Fittings. Sizes as per standard; other sizes on request.
Do you supply a Mill Test Certificate with Hastelloy® C-4?
Yes. Actual values are given in the Mill Test Certificate (EN 10204 3.1) supplied with each order.
What is the difference between Hastelloy® C-4 and Hastelloy® C-276?
Hastelloy® C-4: thermally stable c-alloy. Hastelloy® C-276: most versatile corrosion-resistant alloy. See the comparison table on this page.
Last updated: 30 October 2026. Grade names identify the supply range; designations are not engineering equivalents. Availability, make, origin and documentation are confirmed at quotation.
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