Hastelloy C-4 · UNS N06455 · W. Nr. 2.4610
Hastelloy C-4 (N06455): composition, properties, fittings and flanges
Hastelloy C-4 (N06455, W. Nr. 2.4610) is Nickel-chromium-molybdenum alloy stabilised against sensitisation. Hastelloy C-4 is specified at Nickel Balance, Chromium 14.0 - 18.0, Molybdenum 14.0 - 17.0. Hastelloy C-4 removes the titanium from C-276 chemistry and holds carbon and iron very low, so it resists grain boundary…
- UNS
- N06455
- W. Nr.
- 2.4610
- Density
- 8.64 g/cm³ (0.312 lb/in³)
- Key strength
- 690 MPa / 100 ksi
Identification and standards
| Short form | Hastelloy C-4 · UNS N06455 · W. Nr. 2.4610 |
|---|---|
| Classification | Nickel-chromium-molybdenum alloy stabilised against sensitisation |
| UNS | N06455 |
| Werkstoff number | 2.4610 |
| Material family | Hastelloy Alloys |
Chemical composition
| Element | Composition (wt %) | Why it is there |
|---|---|---|
| Nickel (Ni) | Balance | Matrix |
| Chromium (Cr) | 14.0 - 18.0 | Oxidising media resistance |
| Molybdenum (Mo) | 14.0 - 17.0 | Reducing media resistance |
| Iron (Fe) | 3.00 max | Residual |
| Titanium (Ti) | 0.70 max | Controlled to avoid secondary precipitation |
| Carbon (C) | 0.015 max | Sensitisation control |
| Silicon (Si) | 0.08 max | Controlled for weldability |
| Manganese (Mn) | 1.00 max | - |
Note Single figures are maximum limits unless shown as a range. Always confirm against the heat-specific EN 10204 3.1 certificate supplied with your order.
Mechanical properties
| Tensile strength, min (annealed) | 690 MPa / 100 ksi |
|---|---|
| 0.2 % yield strength, min | 276 MPa / 40 ksi |
| Elongation in 2 in, min | 40 % |
| Typical hardness, annealed | 170 - 220 HB |
| Thermal stability vs C-276 | Better - resists sensitisation on slow cooling |
Warning Values depend on product form, section thickness and heat treatment. Larger sections generally achieve lower strength than thin product; always design against the applicable code allowable stress rather than these figures.
Physical properties
| Density | 8.64 g/cm³ (0.312 lb/in³) |
|---|---|
| Melting range | 1335 - 1380 °C (2435 - 2515 °F) |
| Modulus of elasticity | 211 GPa (30.6 x 10⁶ psi) |
| Thermal conductivity at 20 °C | 10.1 W/m·K |
| Mean coefficient of thermal expansion, 20-100 °C | 12.0 µm/m·°C |
| Specific heat capacity | 408 J/kg·K |
Specifications by product form
| Forgings & flanges | ASTM B564 / ASME SB-564 (UNS N06455) |
|---|---|
| Butt weld fittings | ASTM B366 / ASME SB-366 (WP grade to order) |
| Seamless pipe & tube | ASTM B622 / B619 / ASME SB-622 |
| Plate / sheet / strip | ASTM B575 / ASME SB-575 |
| Bar / rod | ASTM B574 / ASME SB-574 |
| Welding consumables | ERNiCrMo-7 |
| UNS / EN / China | UNS N06455 · W. Nr. 2.4610 |
Product forms available
Hangbo supplies this grade in the following forms. Sizes outside the listed range can often be produced to order.
- Forged flanges blanks and finished flanges to ASME B16.5, B16.47 Series A/B and B16.36
- Butt weld elbows, tees, reducers, caps and stub ends to ASME B16.9 and MSS SP-43
- Seamless pipe and tube to the applicable ASTM / ASME pipe specification
- Forged rings, discs and hubs machined to your drawing
Typical applications
- Flue gas desulphurisation and waste incineration scrubbers
- Mixed acid and halide process streams with thermal cycling
- Pharmaceutical and fine chemical reactors
- As-welded piping where post-weld annealing is impractical
Welding, forming and machining
- Welding
- Excellent as-welded corrosion performance; use ERNiCrMo-7 filler and standard GTAW practice. Low carbon and silicon keep the heat affected zone free of harmful precipitates.
- Heat treatment
- Solution anneal at 1040 - 1095 °C and water quench, or stabilise at 870 - 900 °C where specification permits.
- Hot and cold forming
- Hot work in the range stated by the mill for this grade, then re-solution or re-age before final machining so that the delivered condition matches the certificate.
- Machining
- Machine with sharp carbide or high-speed steel tooling, positive rake, constant feed and ample coolant. Never dwell - the surface work-hardens quickly.
Buy Hastelloy C-4 from Hangbo
Material is supplied with full heat-number traceability, solution annealing or ageing performed under calibrated furnace control, and an EN 10204 3.1 certificate covering chemical analysis, mechanical properties, heat treatment records and the agreed NDT scope. Positive material identification and third party inspection and test reports from SGS are available for critical service.