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Nickel-chromium and nickel-chromium-iron electrothermal alloy wires have good high-temperature oxidation resistance, high strength, not softening easily, and easy welding. It is not easy to be deformed and has a long permanent elongation when used for a long time. Among these materials Cr20Ni80 alloy has excellent comprehensive characteristics and is the first choice for making high quality electric heating elements. These materials are widely used in industrial electric furnaces, metallurgy, machinery, household appliances and other industries to produce heating elements and resistance elements.
Parameter values:
Properties Grade Cr20Ni80 Cr30Ni70 Cr15Ni60 Cr20Ni35 Cr20Ni30 Chemical composition % Ni Remainder Remainder 55～61 34～37 30～34 Cr 20～23 28～31 15～18 18～21 18～21 Fe ≤1.0 ≤1.0 Remainder Remainder Remainder Maximum service temperature ℃ 1200 1250 1150 1100 1100 Melting point ℃ 1400 1380 1390 1390 1390 Density g/cm3 8.4 8.1 8.2 7.9 7.9 Resistivity μΩ·m, 20℃ 1.09±0.05 1.18±0.05 1.11±0.05 1.04±0.05 1.04±0.05 Elongation % ≥20 ≥20 ≥20 ≥20 ≥20 Specific heat J/g.℃ 0.44 0.461 0.494 0.5 0.5 Coefficient of thermal conductivity KJ/m.h℃ 60.3 45.2 45.2 43.8 43.8 linear expansion coefficient α×10-6/℃
(20-100℃)18 17 17 19 19 Microstructure Austenite Magnetic property Nonmagnetic Main product types:
Wire, strip, rod, bar.
