Heat resistance:
The heat resistance of the FeCrAl, FeCrNi and CrNi alloys are shown in this table. The temperature limit are those listed, °C/°F temperatures where the protecting oxide starts to fall off-the scaling temperature. Even if the materials can be used at those temperatures, use at lower temperatures prolonges the service life.
The Kanthal APM and Kanthal APMT alloys are manufactured using powder metallurgy, hence the improved hot strength/creep strenght as compared to the other FeCrAl alloys.
| Properties/Ranking | Less good | Good | Very good | Better | Best |
| Hot strength, T>600C/1112F | Kanthal D Tp 446 |
Kanthal AF |
Alloy 600 Tp 310 | Kanthal APM | Kanthal APMT Alloy 800HT 253MA Alloy 601 |
| Oxidation resistance in dry air | Tp 309, 1050°C/1922F Alloy 800HT, 1050°C/1922F | Tp 446, 1100°C/2012F Alloy 600, 1100°C/2012F | 253MA, 1150°C/2102F Alloy 601, 1150°C/2102F Tp 310, 1150°C/2102F | Kanthal APM/APMT, 1425°C/2600F Kanthal AF, 1300°C/2372F Kanthal D,1300°C/2372F | |
| Oxidation resistance in moist air | Tp 309, 900°C/1652F Alloy 800HT, 900°C/1652F | Tp 446, 950°C/1752F Alloy 600, 950°C/1752F | 253MA, 1000°C/1832F Alloy 601, 1000°C/1832F Tp 310, 1000°C/1832F | Kanthal APM/APMT, 1200°C/2192F Kanthal AF, 1200°C/2192F Kanthal D, 1200°C/2192F | |
| N2, nitrogen from an oxygen plant | Tp 446, 650°C/1202F Tp 309, 650°C/1202F | 253MA, 750°C/1382F Tp 310, 800°C/1382F | Alloy 600, 1000°C/1832F Alloy 601, 1000°C/1832F Alloy 800HT, 900°C/1652F | Kanthal APM, 1050°C/1922F Kanthal AF, 1100°C/2012F Kanthal D, 1000°C/1832F Not preoxidized | Kanthal APM/APMT ,1200°C/2192F Kanthal AF, 1200°C/2192F Kanthal D, 1200°C/2192F Preoxidized |
| Ar, Argon | Tp 446, 950°C/1752F Alloy 800HT, 950°C/1752F Alloy 600, 950°C/1752F | 253MA, 1000°C/1832F Alloy 601, 1000°C/1832F Tp 310, 1000°C/1832F | Kanthal APM/APMT, 1425°C/2600F Kanthal AF, 1300°C/2372F Kanthal D, 1300°C/2372F | ||
| Exothermic gas: 10CO, 15H2, 5CO2, 70N2 | Tp 446 | 253MA, 850°C/1562F Tp 310, 850°C/1562F |
Alloy 800HT, 950°C/1752F | Alloy 601, 1000°C/1832F Alloy 600, 1000°C/1832F | Kanthal APM/APMT, 1150°C/2102F Kanthal AF, 1150°C/2102F Kanthal D, 1100°C/2012F |
| Endothermic gas: 20CO, 40H2, 40N2 | Tp 446 | 253MA, 700°C/1292F Tp 310, 750°C/1382F | Alloy 601, 900°C/1652F Alloy 600, 900°C/1652F Alloy 800HT, 800°C/1472F | Kanthal D, 1000°C/1832F | Kanthal APM/APMT, 1050°C/1922F Kanthal AF, 1050°C/1922F |
| H2, hydrogen, dewpoint<-50 | Tp 446, 900°C/1652F | 253MA, 1000°C/1832F Alloy 800HT, 1000°C | Kanthal APM/APMT, 1425°C/2600F Kanthal AF, 1400°C/2552F Kanthal D, 1300°C/2372F | ||
| Vacuum, 10-3 torr | Kanthal APM/APMT, 1150°C/1922F Kanthal AF, 1200°C/2192F Kanthal D, 1100°C/2012F | ||||
| Oxidizing SO2, SO3-containing gas * | Alloy 800HT, 600°C/1112F | 253MA, 900°C/1652F Tp 446, 950°C/1752F Tp 310, 950°C/1752F | Kanthal APM/APMT, 1200°C/2192F Kanthal AF, 1200°C/2192F Kanthal D, 1150°C/2012F | ||
| Reducing sulfur containing gas | 253MA, 650°C/1202F Alloy 800HT, 600°C/1112F Tp 310, 650°C/1202F | Tp 446, 700°C/1292F | Kanthal APM/APMT, 1025°C/1877F Kanthal AF, 1025°C/1877F Kanthal D, 1000°C/1832F | ||
| Molten metals; Cu **, Zn, Mg | 253MA |
Tp446 |
Kanthal APM/APMT, AF | ||
| Molten aluminum | Metallic materials dissolve! | ||||
| Cracked ammonia | 253MA, 750°C/1382F SS2361, 800°C/1382F | Alloy 800HT, 900°C/1652F Kanthal APM/APMT, 900°C/1652F Kanthal AF, 900°C/1652F Kanthal D, 900°C/1652F | Alloy 601, 1000°C/1832F Alloy 600, 1000°C/1832F |
KANTHAL is a registered trademark of Kanthal AB;
253MA is a registered trademark of Outokumpu Oy.
* Under deposits, conditions may be reducing
** Nickel containing alloys are rapidly attacked
Since a number of process parameters do influence the materials behaviour, the information given above are only to be considered as guidelines, not as guaranteed values.