Nikel-xrom simlari metallurgiya sanoati, kimyo sanoati va elektrotexnika sanoatida elektr isitish va sim o'ralgan rezistorlar uchun yuqori qarshilikli qotishma sifatida keng qo'llaniladi.
Ushbu qotishma sim yuqori elektr qarshilik koeffitsientiga ega, yaxshi oksidlanishga qarshi va korroziyaga qarshi ko'rsatkichlarga ega, shuningdek, yuqori haroratda yuqori quvvatga ega bo'lgan yaxshi mexanik ishlov berish va payvandlash qobiliyatiga ega.
Ni-Cr va Ni-Cr-Fe elektr isitish qotishmalarining asosiy xarakteristikalari
Turi | Cr30Ni70 | Cr15Ni60 | Cr20Ni35 | Cr20Ni80 | Cr20Ni30 | Cr25Ni20 | |
Ishlash | |||||||
Asosiy kimyoviy tarkibi | Ni | Dam olish | 55,0-61,0 | 34,0-37,0 | Dam olish | 30,0-30,4 | 19,0-22,0 |
Cr | 28,0-31,0 | 15,0-18,0 | 18,0-21,0 | 20,0-23,0 | 18,0-21,0 | 24,0-26,0 | |
Fe | ≤ 1,0 | Dam olish | Dam olish | ≤ 1,0 | Dam olish | Dam olish | |
Maks. doimiy xizmat ko'rsatish harorati. elementdan | 1250 | 1150 | 1100 | 1200 | 1100 | 1050 | |
20ºC da qarshilik (mŌ m) | 1,18±0,05 | 1,12±0,05 | 1,04±0,05 | 1,09±0,05 | 1,06±0,05 | 0,95±0,05 | |
Zichlik (g/sm³) | 8.10 | 8.20 | 7.90 | 8.40 | 7.90 | 7.15 | |
Issiqlik o'tkazuvchanligi (KJ/mh ºC) | 45.2 | 45.2 | 43.5 | 60.3 | 43.8 | 43.8 | |
Chiziqlar kengayish koeffitsienti (ax10-6/ºC ) | 17.0 | 17.0 | 19.0 | 18.0 | 19.0 | 19.0 | |
Erish nuqtasi (taxminan) (ºC ) | 1380 | 1390 | 1390 | 1400 | 1390 | 1400 | |
Yirilishdagi cho'zilish (%) | > 20 | > 20 | > 20 | > 20 | > 20 | > 20 | |
Mikrografik tuzilish | ostenit | ostenit | ostenit | ostenit | ostenit | ostenit | |
Magnit xususiyatlari | magnit bo'lmagan | Past magnit | Past magnit | magnit bo'lmagan | Past magnit | magnit bo'lmagan |