General description
Cromel®KP – nickel based alloy (89-91 %), alloyed with chrome and cobalt. Iron, manganese, silicon, copper etc. are contained in quality of impurities, which total amount shouldn't exceed 1,4%. Nickel provides alloy with heat and corrosion resistance, especially in agressive environment.
Cromel®KP is used at production of thermocouples, compensation wires, rheostats, heating devices.
Due to ability to keep stable thermo-emf at temperature up to 1000oС, Cromel®KP is used as a positive thermoelectrode of chromel-alumel thermocouple.
Classification
|
DIN |
2.4870 |
|
Abbr. |
KP/EP(X) |
Chemical composition, %
|
Ni+Co |
Fe |
C |
Mn |
Si |
P |
S |
|
87.4-90.4 |
≤0.3 |
≤0.2 |
≤0.3 |
≤0.4 |
≤0.003 |
≤0.010 |
|
Co |
Co |
Cu |
As |
Pb |
Mg |
Sb |
|
9.0-10.0 |
0.6-1.2 |
≤0.25 |
≤0.002 |
≤0.002 |
≤0.05 |
≤0.002 |
Mechanical properties at 20°С
|
|
soft alloy |
hard alloy |
|
Tensile strength, MPa |
600-700 |
1000-1100 |
|
Elongation, % |
15-20 |
3.5 |
|
Hardness, HB |
150-200 |
300 |
MAIN DELIVERY CONDITIONS
Cromel®KP alloy is suplied in shape of strip or wire. Cromel®KP wire is widely used at production of thermocouples and compensation wires.
Wire
Cromel®KP is supplied with diameters from 0,0254 to 8,0 mm. Wire Cromel®KP with sizes from 0,0254 mm to 0,51 mm can be supplied with insulated coating or without it.
Strip
Standard sizes of Cromel®KP 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 Cromel®KP advantage is mostly defined by physical properties of metal. Foremost, these are thermal stability and corrosion resistance, especially in aggressive environment.
Cromel®KP possesses very successful combination of heat resistance and thermoelectric properties. Alloy has rather big TCLE. At the same time thermo-emf change has almost rectilinear character in the wide range of temperatures.
Cromel®KP is widely applied in pyrometry at production of compensation wires and also in the form of positive 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.
| Alumel®KN |