Type N TC

Thermocouple Alloys for Type N Thermocouple and Extension Wires.

Nicrosil + & Nisil

Material can be ordered to all National or International emf standards as well as customer’s own specifications.Scott Precision Wire Nicrosil and Nisil alloys are available in solid wire, strip or tape and flexible bunch or strand constructions. 

Physical and Mechanical Properties (Values stated are nominal or typical.) 

 

 

Units

Nicrosil +

Nisil -

Nominal composition

%

Ni 84.4

Si 1.4

Cr 14.2

Ni 95.6

Si 4.4

Density at 20°C

g/cm³

8.5

8.6

 

Resistivity at 20°C

µWcm

99

 

35

 

Temperature Coefficient of resistance.

20 – 100°C

1/K

0.00009

0.00068

Coefficient of thermal expansion,

20 – 100°C

1/K

 

16 x 10-6

 

16 x 10-6

 

Thermal conductivity at

20°C

W/mK

 

14

 

28

 

Melting point (approx.)

°C

 

1415

1380

Magnetic properties at 20°C

 

Non-Magnetic

Slight

 

Tensile strength Rm

(0.5mm annealed wire)

N/mm²

 

760

 

620

 

The combination is not immune to corrosion and the following environments can cause detrimental effects:Type N thermocouple wire has greater emf stability and corrosion resistance than Type K, however the combination develops a lower emf output and cannot, therefore, be directly substituted. 


·        The removal of Chromium from the alloy is accompanied by a significant emf drop and embrittlement.'Green rot' can develop on the Nicrosil+ due to the preferential oxidation of Chromium occurring in a reducing or mildly oxidising atmosphere where the partial pressure of oxygen is low. 

·        Sulphur reacts corrosively with the Nisil- at higher temperatures.


Information contained within this technical data sheet is based upon the general experience of Scott Precision Wire Ltd and is believed to be correct at the time of issue. 

No warranty is given or is to be implied from  the details above. 

Customers are advised to carry out independent tests in order to determine the suitability of any Scott Precision Wire Ltd product for an application.

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