Inconel® /Incoloy®
Inconel® are Nickel-Chrome-Iron Alloy’s and Incoloy® are Nickel-Crome-Molybdenum Alloy’s,
| Nickel alloy: |
825 |
625 |
|
| Iron | (Fe) | 31% |
5% |
| Chrome | (Cr) |
20% |
21% |
| Nickel |
(Ni) |
42% |
62% |
| Molybdenum | (Mo) | 2% |
9% |
| Copper | (Cu) | 2% | 1.5% |
| Columbium+Ta | (Cb) |
trace |
3.7% |
These alloys are also known as:
- Incoloy® 825: UNS N08825, similar to CU5MCuC
- Inconel® 625: UNS N06625,CW-6M, CW-6MC, UNS N26625
Typical Properties
- Tensile 520 495 min N/mm2
- Yield 240 275 min N/mm2
- Elongation 20% 25%
- Density 8.1 -8.4 g/cm3
- P/T rating sim. to B16.34 group 3.8 20 bar class 150
Corrosion Properties
- 825 Good
- 625 Outstanding
- Corrosion fatigue, crevice corrosion
- Both poor re:fouling
Additional Uses & Comments
- Alloy 825
- specially resistant to sulphuric and phosphoric acids
- Alloy 625
- good strength without relying on heat treatment
- particularly good crevice corrosion resistance
- outstanding combination of corrosion fatigue and crevice corrosion resistance
- NACE MR01-75 35 HRC max acceptable
- Haynes comment “generally superseded by the more capable Hastelloy® grades”
