Nickel alloys / UNS N06690
Inconel® 690 is a high-chromium nickel alloy with excellent resistance to oxidising acids, high-temperature oxidation and stress-corrosion cracking in high-purity water.
- UNS N06690
- W.Nr. 2.4642
- Spec ASTM B168
- Density 8.19 g/cm³
Also known as / equivalents
| System | Designation |
|---|---|
| UNS | N06690 |
| W.Nr. | 2.4642 |
| EN | NiCr29Fe |
| Also known as | Alloy 690, 2.4642, NiCr29Fe |
Chemical composition
| Element | Min % | Max % |
|---|---|---|
| Ni | 58.0 | — |
| Cr | 27.0 | 31.0 |
| Fe | 7.0 | 11.0 |
| C | — | 0.05 |
| Mn | — | 0.50 |
| Si | — | 0.50 |
| S | — | 0.015 |
| Cu | — | 0.50 |
Mechanical properties
| Property | Value |
|---|---|
| Tensile strength (min) | 586 MPa (85.0 ksi) |
| Yield strength, 0.2% offset (min) | 241 MPa (35.0 ksi) |
| Elongation in 50 mm (min) | 30 % |
Physical properties
| Property | Metric | Imperial |
|---|---|---|
| Density | 8.19 g/cm³ | 0.296 lb/in³ |
| Magnetic response | Non-magnetic | — |
Available forms & specifications
| Form | Specification | Size range |
|---|---|---|
| Sheets & plates | ASTM B168, B443, B409, B424, B127, B162 | 0.3 mm – 6 mm |
| Seamless pipe & tube | ASTM B167, B444, B407, B423, B165, B161 | 1/8" – 24" NB |
| Bars & rods | ASTM B166, B446, B408, B425, B164, B160 | 3 mm – 500 mm |
| Flanges & forgings | ASTM B564 | 1/2" – 48" NB (larger on request) |
| Buttweld fittings | ASTM B366 | 1/2" – 48" NB |
Corrosion & temperature resistance
Nickel-based alloys resist caustic alkalis, chloride stress-corrosion cracking and many acids, and keep their strength and oxidation resistance at temperatures where stainless steels fail.
Applications
Inconel® 690: Nuclear steam generators, nitric acid, incinerators. Chemical and petrochemical plant, sour-gas and oilfield equipment, furnace and heat-treatment hardware, power generation, marine engineering and aerospace components.
Frequently asked questions
What is the UNS number of Inconel® 690?
Inconel® 690 is designated UNS N06690 (W.Nr. 2.4642, EN NiCr29Fe).
What is Inconel® 690 used for?
29% Cr, oxidising-acid resistant. Typical uses: nuclear steam generators, nitric acid, incinerators.
Is Inconel® 690 magnetic?
Non-magnetic.
In which forms can I buy Inconel® 690 from Rajkamal Metals?
Coils & Strips, Sheets & Plates, Pipes & Tubes, Round Bars & Rods, Flanges, Buttweld Fittings, Socket Weld & Threaded Fittings, Fasteners, Ferrule / Instrumentation Fittings, Dish Ends, Custom Orders. Sizes as per standard; other sizes on request.
Do you supply a Mill Test Certificate with Inconel® 690?
Yes. Actual values are given in the Mill Test Certificate (EN 10204 3.1) supplied with each order.
Last updated: 30 October 2026. Grade names identify the supply range; designations are not engineering equivalents. Availability, make, origin and documentation are confirmed at quotation.
Request a quote
Need Inconel® 690?
Send the grade, form, size, quantity and destination. Price on request — every offer is prepared against your specification.