Metals & alloys · Nickel & cobalt alloys
NIMONIC 90-type superalloy
A precipitation-hardened nickel–chromium–cobalt alloy developed for creep resistance and stress-rupture performance in turbine and hot-spring applications.
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01
Overview
- Material class
- Metals & alloys
- Category
- Nickel & cobalt alloys
- Family
- Nickel Superalloy
- Product forms
- Sheet/plate, Bar/rod
Composition
| Constituent | Min | Max | Typical | Note |
|---|---|---|---|---|
| Ni | Balance | |||
| Cr | 18 | 21 | 19.5 | |
| Co | 15 | 21 | 18 | |
| Ti | 2 | 3 | 2.5 | |
| Al | 1 | 2 | 1.5 | |
| C | 0.13 | 0.08 |
02
Properties and conditions
Engineering properties
| Property | Value | Unit | Condition |
|---|---|---|---|
| Density | 8.18 | g/cm³ | Representative; verify product form and condition |
| Elastic modulus | ~220 | GPa | Representative; verify product form and condition |
| Yield strength | ~750–1000 | MPa | aged, product dependent |
| Tensile strength | ~1100–1250 | MPa | aged |
| Service range | up to ~900 | °C | Representative; verify product form and condition |
| Creep strength | high | age-hardened |
Conditions
Representative supplied condition
Condition not fully specified in the source record.
03
Processing and use
Processing
- Solution and ageing cycles control gamma-prime precipitation and grain-boundary carbides.
- Hot working temperature window is relatively narrow.
Applications
- Turbine blades
- Hot springs
- Fasteners
- High-temperature seals
Selection considerations
- Modern alloys may offer higher creep strength, but Nimonic 90 retains a large service base.
- Cobalt price and availability can affect sourcing.
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04
Standards and related materials
Standards and designations
| System | Designation | Note |
|---|---|---|
| UNS | N07090 | |
| W.Nr. | 2.4632 | |
| BS | HR2 / HR501 | product dependent |
05
Sources and context
Sources
- Special Metals NIMONIC alloy 90 technical dataExisting reference
- NASA materials selection resourcesApplication reference
- U.S. Department of Energy critical materials programStrategic reference
Confirm the applicable specification, product form and condition before using values for design or procurement.
Supply and sustainability
Specialty European and global superalloy suppliers; product forms vary.
High-value scrap recovery and repair of legacy components are economically important.
Strategic context
Legacy but still important high-temperature alloy for springs, fasteners and turbine components.
Critical inputs: Nickel, Cobalt, Chromium
Basis: EU Critical Raw Materials Act (2024); USGS 2025 Critical Minerals List