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Nichrome

Нихром, Х20Н80

Nichrome - heat-resistant non-magnetic nickel and chromium alloy. The chemical composition of nichrome CrNi 20/80 - 80% nickel 20% chromium and CrNi 15/60 - 60% nickel and 15% chromium, and there are many options of impurities, depending on the purpose and application (manganese, sulfur, carbon, titanium, aluminum, silicon, iron and phosphorus, but the impurity less than 1%). Nichrome - silvery-gray metal, has a high melting point - 1385 °C. Due to the relatively high electrical resistance and resistance to oxidation at high temperatures, nichrome is widely used in electric heating elements. Nichrome is available in coils. Nichrome supplied form - wire and strip.

The most common nichrome grade - CrNi 20/80 and CrNi 20/80.

Nichrome is highly heat and corrosion resistant material. Nichrome - available with diameters 0.01 - 10 mm.

Chemical composition %
GradeCMnSiCrNiFe
CrNi 20/80 <0.06 <0,6 10 - 15 20-23 basic <1.0
CrNi 15/60 <0.06 <0,6 10 - 15 15-18 55-61 rest

Application

Nichrome used in heating elements, industrial machinery, boilers, heat exchangers. Nichrome is also used in household appliances (kettles, irons, hairdryers, heaters).

Nichrome is used in the manufacture of explosives and pyrotechnics, ignition system, industrial cutting. Nichrome wire is in demand because of its ability to withstand high temperatures. Nichrome wire can be used as an alternative to platinum wire.

GradeThe maximum operating temperature of the heating element, °С
0,2 0,4 1,0 3,0 6,0
CrNi20/80 950 1000 1100 1150 1200
CrNi15/60 900 950 1000 1075 1125

Nichrome is expensive due to high content of nickel.

GradeDiameter, mmThe electrical resistivity
CrNi20/80 0,1-0,5 1,08
0,5-3,0 1,11
3,0 1,13
CrNi15/60 0,1-3,0 1,11
3,0 1,12

Nichrome has high heat resistance, which provides to a surface film of chromium oxide, which has a higher heat resistance than the base material, and prevents oxidation and destruction of the deeper layers of the material.

Nichrome is used to create conductive elements with high heat resistance and available in the form of strip and wire.

Nichrome characteristics
Alloy Nomenclature 
Performance
Cr20Ni80Cr30Ni70Cr15Ni60Cr20Ni35Cr20Ni30
Chemical
composition
Ni Rest Rest 55.0-61.0 34.0-37.0 30.0-34.0
Cr 20.0-23.0 28.0-31.0 15.0-18.0 18.0-21.0 18.0-21.0
Fe ≤1.0 ≤1.0 Rest Rest Rest
Max. continuous service temp. of element 1200 1250 1150 1100 1100
Resistivity at 20ºC (μΩ·m) 1.09 1.18 1.12 1.0 1.04
Density (g/cm3) 8.40 8.10 8.20 7.90 7.90
Thermal conductivity(KJ/m·h·ºC) 60.3 45.2 45.2 43.8 43.8
Coefficient of lines expansion(α×10-6/ºC) 18.0 17.0 17.0 19.0 19.0
Melting point (approx.)( ºC) 1400 1380 1390 1390 1390
Elongation at rupture (%) >20 >20 >20 >20 >20
Micrographic structure austenite austenite austenite austenite austenite
Magnetic properties nonmagnetic nonmagnetic Weak magnetic Weak magnetic Weak magnetic

Nichrome - the most common alloy for the manufacture of heaters, as its material satisfy all the requirements for heating elements.

Nichrome and fe-chr-al. These alloys are characterized by the fact that the resistance is large and does not depend on temperature. In addition, these alloys oxidize at high temperatures.

Nichrome has a very low thermal conductivity. Nichrome mostly made in electric arc furnaces. Nichrome has austenitic structure.

You can contact us to place the order or receive a free consultation via "Contact us" or call +38 (099) 790-07-39.

See also:

Kanthal

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