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Chromel is an alloy
Alloy

An alloy is a partial or complete solid solution of one or more chemical element in a metallic matrix. Complete solid solution alloys give single solid phase microstructure, while partial solutions give two or more phases that may be homogeneous in distribution depending on thermal history....
 made of approximately 90 percent nickel
Nickel

Nickel is a chemical element, with the chemical symbol Ni and atomic number 28. It is a silvery-white lustrous metal with a slight golden tinge....
 and 10 percent chromium
Chromium

Chromium is a chemical element which has the symbol Cr and atomic number 24. It is a steely-gray, Lustre , hard metal that takes a high polish and has a high melting point....
 that is used to make the positive conductors of ANSI Type E (chromel-constantan
Constantan

Constantan is a copper-nickel alloy usually consisting of 55% Copper and 45% Nickel.Its main feature is its Electrical resistance which is constant over a wide range of temperatures....
) and K (chromel-alumel
Alumel

Alumel is an alloy consisting of approximately 95% nickel, 2% manganese, 2% aluminium and 1% silicon. This magnetic alloy is used for thermocouples and thermocouple extension wire....
) thermocouple
Thermocouple

A thermocouple is a junction between two different metals that produces a voltage related to a temperature difference. Thermocouples are a widely used type of list of temperature sensors and can also be used to convert heat into electric power....
s. It can be used up to 1100°C in oxidising atmospheres. Chromel is a registered trademark of the Hoskins Manufacturing Company.

See more at http://www.evek.com.ua/index.php?page=Chromel_thermocouple&lang=2

mel A is an alloy containing 80% of nickel and 20% chromium (by weight).






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Encyclopedia


Chromel is an alloy
Alloy

An alloy is a partial or complete solid solution of one or more chemical element in a metallic matrix. Complete solid solution alloys give single solid phase microstructure, while partial solutions give two or more phases that may be homogeneous in distribution depending on thermal history....
 made of approximately 90 percent nickel
Nickel

Nickel is a chemical element, with the chemical symbol Ni and atomic number 28. It is a silvery-white lustrous metal with a slight golden tinge....
 and 10 percent chromium
Chromium

Chromium is a chemical element which has the symbol Cr and atomic number 24. It is a steely-gray, Lustre , hard metal that takes a high polish and has a high melting point....
 that is used to make the positive conductors of ANSI Type E (chromel-constantan
Constantan

Constantan is a copper-nickel alloy usually consisting of 55% Copper and 45% Nickel.Its main feature is its Electrical resistance which is constant over a wide range of temperatures....
) and K (chromel-alumel
Alumel

Alumel is an alloy consisting of approximately 95% nickel, 2% manganese, 2% aluminium and 1% silicon. This magnetic alloy is used for thermocouples and thermocouple extension wire....
) thermocouple
Thermocouple

A thermocouple is a junction between two different metals that produces a voltage related to a temperature difference. Thermocouples are a widely used type of list of temperature sensors and can also be used to convert heat into electric power....
s. It can be used up to 1100°C in oxidising atmospheres. Chromel is a registered trademark of the Hoskins Manufacturing Company.

Characteristics and properties of chromel (90%-10% Ni-Cr)
CHARACTERISTICS:
Temperature coefficient ( K-1 ) 0.00032
Electrical resistivity ( µO m ) 0.706
Mechanical Properties
Elongation at break ( % ) <44
Izod impact strength ( J m-1 ) 108
Modulus of elasticity ( GPa ) 186
Tensile strength ( MPa ) 620-780
Physical Properties
Physical property

A physical property is any aspect of an object or substance that can be measurement or perception without changing its Identity . Physical properties can be Intensive and extensive properties....
Density ( g cm-3 ) 8.5
Melting point ( °C ) 1420
Thermal Properties
Coefficient of thermal expansion ( x10-6 K-1 ) 17.2 at 20-1000 °C
Maximum use temperature in air ( °C ) 1100
Thermal conductivity ( W m-1 K-1 ) 19 at 23 °C
See more at http://www.evek.com.ua/index.php?page=Chromel_thermocouple&lang=2

Chromel A

Chromel A is an alloy containing 80% of nickel and 20% chromium (by weight). It is used for its excellent resistance to high-temperature corrosion and oxidation.