Incoloy 825 and Inconel 625 are both nickel-based high-temperature alloys. It has corrosion resistance and high-temperature performance, and are widely used in extreme environments such as petrochemicals, aerospace, and nuclear industries.
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alloy 825 material and alloy 625 material Comparison of Chemical Composition
|
Element |
Incoloy 825 |
Inconel 625 |
|
Nickel (Ni) |
38-46 |
58-63 |
|
Chromium (Cr) |
19.5-23.5 |
20-23 |
|
Iron (Fe) |
Balance |
Balance |
|
Molybdenum (Mo) |
2.5-3.5 |
8-10 |
|
Niobium (Nb) |
0.6-1.2 |
3.0-4.0 |
|
Copper (Cu) |
1.5-3.0 |
No Requirement |
|
Carbon (C) |
≤0.05 |
≤0.10 |
incoloy n08825 material and inconel n06625 material Comparison of Mechanical Properties
|
Performance Indicator |
Incoloy 825 |
Inconel 625 |
|
Density (g/cm³) |
8.14 |
8.4 |
|
Tensile Strength (MPa) |
550 |
700-1200 |
|
Yield Strength (MPa) |
220 |
280-345 |
|
Elongation (%) |
≥30 |
≥30 |
|
Brinell Hardness (HB) |
≤200 |
Corresponding to Rockwell B 40-50 |
astm alloy n08825 and astm alloy n06625 High-Temperature Performance Comparison
In terms of maximum operating temperature, Incoloy 825 has a maximum operating temperature of 900°C (1650°F), while Inconel 625 is even higher, reaching 982°C (1800°F).
Regarding melting point, the melting point range of Incoloy 825 is 1370-1400°C, while that of Inconel 625 is 1290-1350°C.
Both alloys exhibit good oxidation resistance, with Inconel 625 showing superior oxidation resistance.
In terms of creep resistance, Incoloy 825 has good creep resistance, while Inconel 625 achieves a very good level of creep resistance.
uns n08825 and uns n06625 Corrosion Resistance Comparison
In acidic environments such as sulfuric acid and hydrochloric acid, Incoloy 825 exhibits excellent corrosion resistance, while Inconel 625 has moderate corrosion resistance in these environments.
In chloride environments, both alloys demonstrate excellent resistance to pitting and crevice corrosion, with Inconel 625 showing superior resistance to pitting and crevice corrosion.
In terms of stress corrosion cracking resistance, Incoloy 825 performs well, while Inconel 625 is even better, with no risk of chloride stress corrosion cracking.
In redox environments, Incoloy 825 has good corrosion resistance, while Inconel 625 performs excellently due to its suitability for various corrosive media.
For seawater/salt solution environments, Incoloy 825 has good corrosion resistance, while Inconel 625 is almost corrosion-free, exhibiting even more outstanding corrosion resistance.
alloy 625 and alloy 825 Comparison of Processing and Weldability
In terms of formability, both Incoloy 825 and Inconel 625 exhibit good performance. Incoloy 825 can be directly processed by hot and cold working, while Inconel 625, due to its higher strength, is slightly more difficult to process.
In terms of weldability, both also possess good weldability. Incoloy 825 does not require preheating during welding and has no risk of sensitization after welding. Inconel 625 requires control of welding parameters, and generally does not require heat treatment after welding.
Incoloy 825 and inconel 625 Selection Recommendations
If the working conditions involve medium to high temperatures (≤900℃), primarily acidic media corrosion (sulfuric acid, hydrochloric acid), and cost sensitivity is a factor, prioritize Incoloy 825.
If the working conditions involve high temperatures (≤982℃), high stress, extreme corrosive environments (such as deep sea, strong chloride corrosion), or high-end fields such as aerospace, prioritize Inconel 625.
If complex components need to be manufactured and the processing and welding requirements are less stringent, choose Incoloy 825; if high loads need to be withstood and excellent high-temperature stability is required, choose Inconel 625.
