General description
Alumel®KN - nickel-based alloy, alloyed with aluminum, silicon, manganese and cobalt. What is more, cobalt is present as impurity at nickel, and for ensuring the required value of Seebeck EMF his contents has to be within 0,6-1,0%.
Alumel®KN is being used in pyrometry for production of compensating wires and also in the form of a negative thermoelectrode for production of thermocouples.
Thermocouples with Alumel®KN is using for changing temperature up to 1000 °С. After Seebeck EMF stabilizing, it is possible to use thermocouple at temperature up to 1300°С.
Classification
|
DIN |
2.4122 |
|
Abbr. |
KN/KNX |
Chemical composition, %
|
Ni+Co |
Fe |
C |
Mn |
Si |
P |
S |
|
91.5-95.15 |
≤0.3 |
≤0.1 |
1.8-2.7 |
0.85-1.5 |
≤0.005 |
≤0.010 |
|
Co |
Al |
Cu |
As |
Pb |
Mg |
Sb |
|
0.6-1.2 |
1.6-2.4 |
≤0.25 |
≤0.002 |
≤0.002 |
≤0.05 |
≤0.002 |
Mechanical properties at 20°С
|
|
soft alloy |
hard alloy |
|
Tensile strength, MPa |
500-600 |
1000-1100 |
|
Elongation, % |
20-25 |
3,5 |
|
Hardness, HB |
130 |
250-300 |
MAIN DELIVERY CONDITIONS
Alumel®KN alloy is suplied in shape of strip or wire.
Alumel®KN wire, price of which depends on nickel and aluminum prices, is demanded in the industry at production of thermocouples and compensation wires.
Supplied together with alloy СгоmеІ®КР
Wire
Alumel®KN is supplied with diameters from 0,0254 to 8,0 mm. Wire Alumel®KN with sizes from 0,0254 mm to 0,51 mm can be supplied with insulated coating or without it.
Strip
Standard sizes of Alumel®KN strip are next: thickness from 0,10 to 3,0 mm, width from 4 to 195 mm.
APPLICATION
In view of the considerable content of nickel in alloy Alumel®KN advantage is mostly defined by physical properties of metal. Foremost, these are thermal stability and corrosion resistance, especially in aggressive environment. Increase of these qualities of Alumel®KN alloy is reached by addition of the alloying elements. Alloying of Alumel®KN allows to increase a ductility at temperature from 600°C to 1100°C, provides long durability at temperature from 700°C to 900°C, as well it allows to use Alumel®KN, after stabilization of TCLE, at a temperature up to 1300°C.
Alumel®KN is widely applied in pyrometry at production of compensation wires and also in the form of negative thermoelectrode at production of thermocouples. Thermocouple is a thermoelectric element which is applied to measure temperature of various objects, and also in automation systems. Thermocouple consists of two thermoelectrodes: positive and negative. The most popular thermocouples are chromel-alumel thermocouples, because of their universalism and availability
| Cromel®KP |