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Nickel Chromium Alloy for Electrical Resistance Heating

The nickel chromium alloy for electrical resistance heating has higher resistivity, great resistance to surface oxidation and excellent strength at high temperature as well as superior processability and weldability. For long time use, this nickel chromium alloy is hard to deform and has small elongation. In addition, it features high radiant emittance, strong corrosion resistance, nonmagnetic property and long service life.

In the family of this high resistance material, the Cr20Ni80 alloy boasts more superior comprehensive properties. It is the preferred alloy for high quality electrical heating element and widely used in metallurgy, household appliances and machinery manufacturing industry for heating elements and in electric appliance industry for resistance materials.

Since made from rare nickels, the nickel chromium alloy for electrical resistance heating comes with higher price than iron-chromium-aluminum alloy but lower service temperatures.

Technical Parameters of Electrical Resistance Nickel Alloy
Model Ni80Cr20 Ni70Cr30 Ni60Cr15 Ni35Cr20 Ni30Cr20
Properties
Main chemical composition (%) Ni 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
Maximum service temperature (℃) 1200 1250 1150 1100 1100
Average melting point (℃) 1400 1380 1390 1390 1390
Density (g/cm3) 8.40 8.10 8.20 7.90 7.90
Resistivity (μΩ.m,20 ℃) 1.09 1.18 1.12 1.0 1.04
Elongation (%) ≥20 ≥20 ≥20 ≥20 ≥20
Specific heat (J/g. ℃) 0.440 0.461 0.494 0.500 0.500
Heat conductivity coefficient (KJ/m.h.℃) 60.3 45.2 45.2 43.8 43.8
Linear expansion coefficient (α×10-6/℃) 18.0 17.0 17.0 19.0 19.0
Microscopic structure Austenitic Austenitic Austenitic Austenitic Austenitic
Magnetism Non Non Non Non Non
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