Aloi za Nickel Chrome (NiCr) ni nyenzo zinazostahimili upinzani wa juu kwa kawaida hutumika katika programu zilizo na viwango vya juu vya joto vya juu vya kufanya kazi hadi 1,250°C (2,280°F).
Aloi hizi za Austenitic zinajulikana kwa nguvu zao za juu za kiufundi kwenye joto ikilinganishwa na aloi za FeCrAl pamoja na nguvu zao za juu za kutambaa. Aloi za nickel Chrome pia husalia kuwa ductile zaidi ikilinganishwa na aloi za FeCrAl baada ya muda mrefu wa joto. Chromium Oxide iliyokoza (Cr2O3) huundwa kwa halijoto ya juu ambayo inaweza kuathiriwa na kusambaa, au kuwaka, na kusababisha uchafuzi unaowezekana kulingana na programu. Oksidi hii haina sifa za kuhami umeme kama vile Oksidi ya Aluminium (Al2O3) ya aloi za FeCrA. Aloi za nickel Chrome huonyesha ukinzani mzuri wa kutu isipokuwa mazingira ambayo salfa iko.
Daraja | Ni80Cr20 | Ni70Cr30 | Ni60Cr23 | Ni60Cr15 | Ni35Cr20 | Karma | Evanohm | |
Utungaji mdogo% | Ni | Bal | Bal | 58.0-63.0 | 55.0-61.0 | 34.0-37.0 | Bal | Bal |
Cr | 20.0-23.0 | 28.0-31.0 | 21.0-25.0 | 15.0-18.0 | 18.0-21.0 | 19.0-21.5 | 19.0-21.5 | |
Fe | ≦1.0 | ≦1.0 | Bal | Bal | Bal | 2.0-3.0 | - | |
Al1.0-1.7 Ti 0.3-0.5 | Al2.7-3.2 Mn0.5-1.5 | Al2.7-3.2 Cu2.0-3.0 Mn0.5-1.5 | ||||||
Kiwango cha juu cha halijoto cha kufanya kazi (°C) | 1200 | 1250 | 1150 | 1150 | 1100 | 300 | 400 | |
Ustahimilivu(Ω/cmf,20℃) | 1.09 | 1.18 | 1.21 | 1.11 | 1.04 | 1.33 | 1.33 | |
Ustahimilivu (uΩ/m,60°F) | 655 | 704 | 727 | 668 | 626 | 800 | 800 | |
Uzito (g/cm³) | 8.4 | 8.1 | 8.4 | 8.2 | 7.9 | 8.1 | 8.1 | |
Uendeshaji wa Joto(KJ/m·h·℃) | 60.3 | 45.2 | 45.2 | 45.2 | 43.8 | 46.0 | 46.0 | |
Mgawo wa Upanuzi wa Mstari(×10¯6/℃)20-1000℃) | 18.0 | 17.0 | 17.0 | 17.0 | 19.0 | - | - | |
Kiwango Myeyuko(℃) | 1400 | 1380 | 1370 | 1390 | 1390 | 1400 | 1400 | |
Ugumu (Hv) | 180 | 185 | 185 | 180 | 180 | 180 | 180 | |
Nguvu ya Mkazo (N/mm2 ) | 750 | 875 | 800 | 750 | 750 | 780 | 780 | |
Kurefusha(%) | ≥20 | ≥20 | ≥20 | ≥20 | ≥20 | 10-20 | 10-20 | |
Muundo wa Micrographic | austenite | austenite | austenite | austenite | austenite | austenite | austenite | |
MagneticProperty | Sio | Sio | Sio | Kidogo | Sio | Sio | Sio | |
Maisha ya Haraka(h/℃) | ≥81/1200 | ≥50/1250 | ≥81/1200 | ≥81/1200 | ≥81/1200 | - | - |