Nickel Alloy Inconel 690 (UNS N06690, Alloy 690, inconel690) wire /
Rod
Inconel 690 has the highest chromium content (29% Cr) among nickel
alloys suitable for fabrication of pressure equipment, which
confers exceptional resistance to oxidizing media. It is used for
hot sulfuric acid, nitric acid, and nitric/ hydrofluoric acid
mixtures, as well as for oxidizing salts. The high chromium content
also improves resistance in hot sulfidizing environments.
Inconel 690 has good resistance to oxidizing chemicals, such as
nitric acid, and to sulfur-containing gases at high temperature.
Inconel 690 has a superior stress cracking resistance than Inconel
600 in steam generation nuclear reactors for piping, separators and
weldments.
Applications involving nitric acid or nitric-plus-hydrochloric
acid. Examples are tail-gas reheaters used in production of nitric
acid and steam-heating coils in nitric- plus-hydrochloric acid
solutions used for pickling stainless steels and reprocessing
nuclear fuels. Inconel 690 is also useful for hightemperature
service in gases containing sulfur.
Chemical Composition
| Grade | Ni% | Cr% | Fe% | Ti% | Mn% | Si% | C% | Cu% | P% | S% | Cu% | RE% |
| Inconel 690 | Min 58 | 27-31 | 7-11 | Max 0.5 | Max 0.5 | Max 0.5 | Max 0.05 | Max 0.5 | Max 0.030 | Max 0.015 | Max 0.5 | Max 0.1 |
Specifications
| Grade | UNS | Werkstoff Nr. |
| Inconel 690 | N06690 | 2.4642 |
Physical Properties
| Grade | Density | Melting Point |
| Inconel 690 | 8.2 g/cm3 | 1340°C-1377 °C |
Mechanical Properties
| Alloy | Tensile Strength | Yield Strength | Elongation | Brinell Hardness (HB) |
| Inconel 690 Annealed | >580 MPa | >260 MPa | 30% | 150-240 |
Size Range
Inconel 690 wire, bar are available.
| Other nickel alloy products |
| Inconel | Incoloy | Monel | Hastelloy | Nimonic |
| Inconel 600 | Incoloy 800 | Monel 400 | Hastelloy X | Nimonic 75 |
| Inconel 601 | Incoloy 800H | Monel K500 | Hastelloy C276 | Nimonic 80A |
| Inconel 625 | Incoloy 800HT | | Hastelloy B | Nimonic 90 |
| Inconel 718 | Incoloy 825 | | Hastelloy B2 | Nimonic 105 |
| Inconel X-750 | Incoloy A286 | | Hastelloy B3 | |
| Inconel 660 | Incoloy 925 | | | |
| Inconel 690 | | | | |
| | | | | |
| Pure Nickel | Precision Alloy | Other | Welding Material |
| Nickel 200 | 1J50 | 904L | ERNi-1 | ER308 |
| Nickel 201 | 1J79 | Alloy 20 | ERNiCrMo-3 | ER308LSi |
| | 1J85 | | ERNiCr-3 | ER309 |
| | 4J29 Kovar | | ERNiCu-3 | ER309L |
| | 4J36 Invar 36 | | ERNiCrMo-4 | ER316 |
| | Alloy 42 |
