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DIN 17742 NiCr7030 Solution-Annealed Alloy: High-Performance Heating Conductors

The material NiCr7030 with the material number 2.4658, which is applied in the form of strips 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, is an austenitic nickel-chromium electrical reistance alloy. This alloy distinguishes itself by good scale-resistance as well as by durability under alternating stress in oxidizing/reducing atmosphere for operating temperatures of up to 1250 °C. Application for industrial electric furnaces, enamelling furnaces and night-current storage space-heaters. Processing properties: Formability: good Weldability: satisfactory

Properties

General

PropertyTemperatureValue

Density

20.0 °C

8.1 - 8.2 g/cm³

Mechanical

PropertyTemperatureValue

Elastic modulus

20.0 °C

200 GPa

Elongation

20.0 °C

25 %

Hardness, Brinell

20.0 °C

200 [-]

Tensile strength

20.0 °C

700 MPa

Yield strength Rp0.2

20.0 °C

300 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 - 1250 °C

Melting point

1400 °C

Typical for Nickel Chromium Alloy

Specific heat capacity

20.0 °C

420 - 460 J/(kg·K)

Thermal conductivity

20.0 °C

13 - 13.8 W/(m·K)

Electrical

PropertyTemperatureValue

Electrical resistivity

20.0 °C

1.1E-6 - 1.19E-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

Chemical properties

PropertyValue

Aluminium

0.3 %

Carbon

0.1 %

Chromium

29 - 32 %

Copper

0.5 %

Iron

5 %

Manganese

1 %

Nickel

60 %

Phosphorus

0.02 %

Silicon

0.5 - 2 %

Sulfur

0.015 %


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