Incoloy 926 · UNS N08926 · W. Nr. 1.4529
Incoloy 926 (N08926): composition, properties, fittings and flanges
Incoloy 926 (N08926, W. Nr. 1.4529) is Super austenitic nitrogen-bearing nickel-iron-chromium-molybdenum alloy. Incoloy 926 is specified at Nickel 24.0 - 26.0, Chromium 19.0 - 21.0, Molybdenum 6.00 - 7.00. Incoloy 926 reaches a PREN near 43 with 6.5 % molybdenum plus nitrogen, putting it between 904L and the nickel C alloys for…
- UNS
- N08926
- W. Nr.
- 1.4529
- Density
- 8.10 g/cm³ (0.293 lb/in³)
- Key strength
- 650 MPa / 94 ksi
Identification and standards
| Short form | Incoloy 926 · UNS N08926 · W. Nr. 1.4529 |
|---|---|
| Classification | Super austenitic nitrogen-bearing nickel-iron-chromium-molybdenum alloy |
| UNS | N08926 |
| Werkstoff number | 1.4529 |
| Material family | Incoloy Alloys |
Chemical composition
| Element | Composition (wt %) | Why it is there |
|---|---|---|
| Nickel (Ni) | 24.0 - 26.0 | Austenite stability and SCC resistance |
| Chromium (Cr) | 19.0 - 21.0 | Oxidation and pitting resistance |
| Molybdenum (Mo) | 6.00 - 7.00 | Pitting and crevice resistance |
| Nitrogen (N) | 0.15 - 0.25 | Strength and pitting resistance |
| Copper (Cu) | 0.50 - 1.50 | Reducing acid resistance |
| Iron (Fe) | Balance | Matrix |
| Manganese (Mn) | 2.00 max | - |
| Carbon (C) | 0.02 max | Sensitisation control |
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) | 650 MPa / 94 ksi |
|---|---|
| 0.2 % yield strength, min | 295 MPa / 43 ksi |
| Elongation in 2 in, min | 35 % |
| Typical hardness, annealed | 160 - 210 HB |
| PREN, typical | About 43 |
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 | 8.10 g/cm³ (0.293 lb/in³) |
|---|---|
| Melting range | 1320 - 1390 °C (2410 - 2535 °F) |
| Modulus of elasticity | 195 GPa (28.3 x 10⁶ psi) |
| Thermal conductivity at 20 °C | 12.0 W/m·K |
| Mean coefficient of thermal expansion, 20-100 °C | 15.3 µm/m·°C |
| Specific heat capacity | 450 J/kg·K |
Specifications by product form
| Forgings & flanges | ASTM B462 / B649 (UNS N08926) |
|---|---|
| Butt weld fittings | ASTM B366 / ASME SB-366 (WP grade to order) |
| Seamless pipe & tube | ASTM B677 / ASME SB-677 |
| Plate / sheet / strip | ASTM A240 / B625 family |
| Bar / rod | ASTM B649 |
| Welding consumables | ERNiCrMo-3 or over-alloyed 625 filler |
| UNS / EN / China | UNS N08926 · W. Nr. 1.4529 |
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
- Seawater cooling, ballast and fire water piping
- Flue gas desulphurisation absorbers and ducting
- Brine, evaporated salt and chlorine dioxide service
- Offshore platform utility and deluge systems
Welding, forming and machining
- Welding
- Weld with ERNiCrMo-3 or a matching super austenitic filler. Keep heat input moderate to protect the nitrogen content and avoid sigma phase in thick sections.
- Heat treatment
- Solution anneal at 1150 - 1200 °C and water quench.
- 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 Incoloy 926 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.