Metals & alloys · Nickel & cobalt alloys
INCONEL 690-type nickel alloy
A high-chromium Ni–Cr–Fe alloy developed for strong resistance to oxidizing media and stress-corrosion cracking in nuclear steam-generator and chemical service.
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01
Overview
- Material class
- Metals & alloys
- Category
- Nickel & cobalt alloys
- Family
- High-Chromium Nickel Alloy
- Product forms
- Sheet/plate, Bar/rod
Composition
| Constituent | Min | Max | Typical | Note |
|---|---|---|---|---|
| Ni | 58 | 60 | ||
| Cr | 27 | 31 | 29 | |
| Fe | 7 | 11 | 9 | |
| C | 0.05 | 0.02 |
02
Properties and conditions
Engineering properties
| Property | Value | Unit | Condition |
|---|---|---|---|
| Density | 8.19 | g/cm³ | Representative; verify product form and condition |
| Elastic modulus | 211 | GPa | Representative; verify product form and condition |
| Yield strength | ~240–550 | MPa | condition dependent |
| Tensile strength | ~585–760 | MPa | Representative; verify product form and condition |
| Chromium content | ~29 | wt.% | Representative; verify product form and condition |
| Nuclear-water resistance | high | qualified product |
Conditions
Representative supplied condition
Condition not fully specified in the source record.
03
Processing and use
Processing
- Product form, thermal history and manufacturing route materially affect performance.
Applications
- Steam-generator tubing
- Nuclear heat exchangers
- Nitric-acid equipment
Selection considerations
- Use the current governing standard and supplier certification for design or procurement.
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04
Standards and related materials
Standards and designations
| System | Designation | Note |
|---|---|---|
| UNS | N06690 | |
| Werkstoff | 2.4642 | |
| ASME | SB-163 / SB-168 | product dependent |
05
Sources and context
Sources
- Special Metals INCONEL alloy 690 bulletinExisting reference
- US NRC Alloy 690 acceptance referencesExisting reference
- U.S. Department of Energy critical materials programStrategic reference
- U.S. Nuclear Regulatory Commission materials resourcesApplication reference
Confirm the applicable specification, product form and condition before using values for design or procurement.
Supply and sustainability
Availability and lead time depend on grade, product form, certification and regional supply chain.
Segregated recovery and closed-loop recycling improve material efficiency where practical.