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
o Corrosion fatigue, crevice corrosion
• Both poor re:fouling
Additional Uses & Comments
• Alloy 825
o specially resistant to sulphuric and phosphoric acids
o Alloy 625
o good strength without relying on heat treatment
o particularly good crevice corrosion resistance
o 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• Haynes comment “generally superseded by the more capable Hastelloy® grades
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