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NiCr8020 Alloy – DIN 17742 Solution Annealed, Ideal for High-Temperature Heating Conductors

The material NiCr8020 with the material number 2.4869 is applied in the form of strips, sheets, tubes and wires (see also heating conductor alloys according to DIN 17470 or electrical resistance alloys according to DIN 17471) for furnace construction components and heating conductors. It is a nickel-chromium heating conductor alloy for operating temperatures of up to 1150 °C and often contains additives of rare earths for a higher resistance to oxidation, especially with frequent switching operations or broad temperature variations. The resistance to atmospheric corrosion at 20 °C is high up to the upper operating temperature the resistance to air and other oxygen-containing gases as well as to nitrogen-containing low-oxygen gases is high as well, yet it is low to oxidizing as well as reducing gases containing sulphur. The resistance to carbonizing is high. Application for industrial electric furnaces, enamelling furnaces, household appliances, night-current storage space-heaters.

Properties

General

PropertyTemperatureValue

Density

20.0 °C

8.2 g/cm³

Mechanical

PropertyTemperatureValue

Elastic modulus

20.0 °C

200 GPa

Elongation

20.0 °C

25 %

Hardness, Brinell

20.0 °C

230 [-]

Tensile strength

20.0 °C

600 MPa

Yield strength Rp0.2

20.0 °C

220 MPa

Yield strength Rp1.0

20.0 °C

250 MPa

Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

100.0 °C

1.35E-5 1/K

200.0 °C

1.4E-5 1/K

400.0 °C

1.5E-5 1/K

600.0 °C

1.55E-5 1/K

800.0 °C

1.6E-5 1/K

Max service temperature, long

0 - 1150 °C

Melting point

1400 °C

Typical for Nickel Chromium Alloy

Specific heat capacity

20.0 °C

460 J/(kg·K)

Thermal conductivity

20.0 °C

13 W/(m·K)

Electrical

PropertyTemperatureValue

Electrical resistivity

20.0 °C

1.1E-6 Ω·m

100.0 °C

1.14E-6 Ω·m

200.0 °C

1.16E-6 Ω·m

300.0 °C

1.18E-6 Ω·m

400.0 °C

1.2E-6 Ω·m

500.0 °C

1.22E-6 Ω·m

600.0 °C

1.21E-6 Ω·m

700.0 °C

1.21E-6 Ω·m

800.0 °C

1.22E-6 Ω·m

900.0 °C

1.23E-6 Ω·m

1000.0 °C

1.24E-6 Ω·m

1100.0 °C

1.26E-6 Ω·m

1200.0 °C

1.28E-6 Ω·m

Chemical properties

PropertyValue

Aluminium

0.3 %

Carbon

0.15 %

Chromium

19 - 21 %

Copper

0.5 %

Iron

1 %

Manganese

1 %

Nickel

75 %

Phosphorus

0.02 %

Silicon

0.5 - 2 %

Sulfur

0.015 %


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