Inconel 690 (UNS N06690/W. Nr. 2.4642)
1.Chemical Composition(wt%)
| Ni |
Cr |
Fe |
C |
Si |
Mn |
S |
Cu |
| ≥58.0 |
27.0-31.0 |
7.0-11.0 |
≤0.05 |
≤0.50 |
≤0.50 |
≤0.015 |
≤0.50 |
2.Physical Properties
density
（g/m3） |
Melting range
（°C） |
specific heat capacity
（J/kg*°C） |
electrical resistivity
（Ω*m） |
permeability |
poisson ratio |
| 8.19 |
1343-1377 |
450 |
1.148 |
1.001 |
0.289 |
3.Mechanical Properties at room temperature
tensile strength
（MPa） |
yield strength
（MPa） |
Elongaion % |
| 372 |
738 |
44 |
4.Characteristics
1.Excellent resistance to many corrosive aqueous media and hightemperature atmospheres.
2.High strength, good metallurgical stability, and favorable fabrication characteristics.
3.outstanding resistance to oxidizing chemicals and to high-temperature oxidizing gases.
4.Good resistance to stresscorrosion cracking in chloride-containing environments as well
as to sodium hydroxide solutions.
5.Applications
The alloy’s resistance to sulfur-containing gases makes it an attractive material for such
applications as coal-gasification units, burners and ducts for processing sulfuric acid, furnaces
for petrochemical processing, recuperators, incinerators, and glass vitrification equipment for
radioactive waste disposal. In various types of high-temperature water, alloy 690 displays low
corrosion rates and excellent resistance to stress-corrosion cracking. Thus, alloy 690 is widely
used for steam generator tubes, baffles, tubesheets, and hardware in nuclear power generation.
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