2.4642
- N06690
- Incoloy 690
INCONEL alloy 690 is a high-chromium nickel alloy which is particularlysuitable for use in oxidising media. Good mechanical properties at room temperature and high temperature, paired with high ductility. Typical applications are: treatment of radioactive waste,components in boilers and steam generators in pressurised water reactors,production of alkali metal sulphates using Mannheim furnaces, fittings in combustion units for crude oil (oil ash corrosion)and glass and silicate production.
.
Mechanical Properties
| Tensile strength: | 586 | N/mm² |
| Yield strength 0,2% : | 240 | ≥ N/mm² |
| Elongation: | 30 | ≥ % |
| Hardness HB30: | 85 | ≤ HB |
Chemical Composition
Nickel
Ni
58% min
Carbon
C
0,05% max
Silicon
Si
0,015% max
Magnese
Mn
0,50% max
Sulphur
S
0,03% max
Copper
Cu
0,50% max
Phosphorus
P
0,02% max
Titan
Ti
0,50% max
Iron
Fe
7-11% max
Chromium
Cr
27-31% max
Heat Treatment
1080-1150°C followed by water quenching
Very good resistance to fluoride containing hot nitric acid,good resistance to stress corrosion cracking caused by alkalis,excellent resistance to stress corrosion cracking caused by media containing chloride and polythionic acids,excellent resistance to many aggressive aqueous media or in the primary and secondary loops of nuclear reactors,good resistance to oxidation, sulphidation and metal dusting in hot gases.
TIG and plasma welding processes. When welding roots, sufficient protectionof the root needs to be ensured with pure argon so that the welding seam is free of oxides after welding.
Marking
All material will be marked as follow:
- Manufacturer’s name
- Material grade
- Size
- Heat Number
Certification
Material will be delivered with certificate EN 10204 3.1
