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DIN 17744 NiCr20CuMo – Corrosion‑Resistant Alloy for Construction Components

The material NiCr20CuMo with the material number 2.4660 is applied in the form of strips, sheets, tubes, bars, wires and forgings for corrosion-resistant construction components. The alloy has an excellent resistance to corrosion in sulphuric, phosphoric and organic acids as well as in aqueous solutions of their salts. The resistance to nitric acid is good as well. As a result of the tailored chemical composition, the alloy also shows excellent resistance to intercrystalline corrosion and stress cracking corrosion. The molybdenum content ensures good resistance to pitting and crevice corrosion. NiCr20CuMo is applied in a wide range at temperatures of up to about 500 °C. Typical fields of application are e.g. plants for the production of sulphuric acid as well as processes that are based on sulphuric acid, such as, among others, extraction columns in the amino acid production and for the production of drugs, plants for the production of synthetic man-made materials and for the production of food as well as heat exchangers in refineries and for the production of phosphoric and hydrofluoric acid. Processing properties: Formability: good Weldability: satisfactory

Properties

General

PropertyTemperatureValue

Density

20.0 °C

8.1 g/cm³

Mechanical

PropertyTemperatureValue

Elastic modulus

20.0 °C

195 GPa

Elongation

20.0 °C

30 %

100.0 °C

40 %

200.0 °C

40 %

300.0 °C

40 %

Hardness, Brinell

20.0 °C

217 [-]

Reduction of area

20.0 °C

50 %

Tensile strength

20.0 °C

550 MPa

100.0 °C

520 MPa

200.0 °C

500 MPa

300.0 °C

480 MPa

Yield strength Rp0.2

20.0 °C

240 MPa

100.0 °C

210 MPa

200.0 °C

180 MPa

300.0 °C

140 MPa

Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

100.0 °C

1.5E-5 1/K

200.0 °C

1.57E-5 1/K

300.0 °C

1.63E-5 1/K

400.0 °C

1.68E-5 1/K

500.0 °C

1.72E-5 1/K

600.0 °C

1.74E-5 1/K

700.0 °C

1.76E-5 1/K

800.0 °C

1.78E-5 1/K

Max service temperature, long

0 - 500 °C

Melting point

1200 - 1480 °C

Typical for Nickel Chromium Iron Alloy

Specific heat capacity

20.0 °C

500 J/(kg·K)

Thermal conductivity

20.0 °C

12.3 W/(m·K)

100.0 °C

13.1 W/(m·K)

200.0 °C

14.8 W/(m·K)

300.0 °C

16.5 W/(m·K)

400.0 °C

18.1 W/(m·K)

500.0 °C

19.7 W/(m·K)

600.0 °C

21 W/(m·K)

Electrical

PropertyTemperatureValue

Electrical resistivity

20.0 °C

1.08E-6 Ω·m

Chemical properties

PropertyValue

Carbon

0.07 %

Chromium

19 - 21 %

Cobalt

1.5 %

Copper

3 - 4 %

Iron

28.4 %

Manganese

2 %

Molybdenum

2 - 3 %

Nickel

32 - 38 %

Phosphorus

0.03 %

Silicon

1 %

Sulfur

0.015 %


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