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Chromel

Chromel - nickel-chromium alloy, which has a favorable combination of thermoelectric properties and heat resistance. Contains about 10% Cr, 1% Co, as well as impurities (up to 0.2% C and up to 0,3% Fe). Chromel is characterized by relatively large and almost linear change of thermopower in a wide temperature range. Thermopower thermocouple chromel - platinum junction at temperatures 1000 and 0 °C - about 33 mV. Chromel has constant thermopower in continuous operation at the temperature range 20-1000 °C, at a higher temperature of the alloy is reduced operational reliability. Chromel is produced in the form of wire and used in conjunction with alumel as positive thermoelectrodes thermocouple chromel - alumel, which is used for temperature measurement. Chromel is also used as compensating cable.

GradeNiCrCoSiFeMgMnCuPb
Chromel Т (НХ 9,5) 89,0-91,0 9,0-10,0 0,6-1,2 0,4 0,3 0,05 0,30 0,25 0,002
Chromel К (НХ 9) 89,0-91,0 8,5-10,0 0,4-1,2 0,4 0,3 0,05 0,30 0,25 0,002
Chromel ТМ (НХМ 9,5) 89,0-91,0 9,0-10,0 ˜
0,1-0,6 0,3 0,05 0,30 0,25 0,002
Chromel КМ (НХМ 9) 89,0-91,0 8,5-10,0 ˜
0,1-0,6 0,3 0,05 0,30 0,25 0,002


Ni+CoFeCSiMnCoAlImpurities
87.4 - 90.4 ≤ 0.3 ≤ 0.2 ≤ 0.4 ≤ 0.3 9 - 10 0.6 - 1.2 1.4


Physical properties of Chromel
Hardness, Hard alloy HB 10 -1 = 300 MPa
Hardness, soft alloy HB 10 -1 = 150 - 200 MPa
melting point, °C: 1435
Forging temperature, °C: 1200 - 1000
annealing temperature, °C: 800 - 900

LLC Renal-d supplies thermocouple wire from Ukraine:

See also:

Thermocouples

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