- Grade / Alloy
- Alloy 901
- EN / W.Nr.
- 2.4662
- AISI / SAE
- —
- UNS
- N09901
- Family
- Age-hardenable nickel
Chemical composition
Chemical composition
Typical compositionTypical composition of the principal alloying elements; not a complete acceptance analysis.
| Element | Content (% by mass) |
|---|---|
| NiNickel | 40–45 |
| CrChromium | 11–14 |
| FeIron | Balance |
| MoMolybdenum | 5–7 |
| TiTitanium | 2.35–3.1 |
| MnManganese | ≤ 1 |
| SiSilicon | ≤ 0.6 |
| AlAluminium | ≤ 0.35 |
| CuCopper | ≤ 0.5 |
| CCarbon | ≤ 0.1 |
Values describe the grade, not the analysis of a specific batch. The applicable product specification and material certificate determine acceptance. A dash does not mean zero.
901 among nickel alloys
Some nickel alloys are known for acid resistance; others for carrying loads while hot. 901 belongs to the latter group. Gas turbines combine heat with mechanical forces, making elevated-temperature strength central to the material’s role.
What does age-hardenable mean?
Titanium and aluminium allow fine strengthening particles to form within 901 during controlled heat treatment. This ageing response explains its use in high-strength components. Molybdenum is another important addition; the strengthening is internal rather than simply a hard surface layer.
Turbine discs, shafts and rings
Discs carry rotating assemblies, shafts transmit motion and rings provide structural support. Alloy 901 serves these gas-turbine components as well as casings, where retained strength and sustained mechanical performance matter alongside temperature.
901, 718 and other superalloys
901 is distinct from Alloy 718. Both are age-hardenable, but their compositions and identifiers differ. The codes 2.4662 and N09901 identify 901 separately from other high-temperature nickel alloys.
Typical application areas
Gas turbine discs, shafts, rings and casings.
Product and cutting options
Relevant product forms for this material are listed below. Availability varies with grade and dimensions.