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DIN 17744: NiCr21Mo6Cu – Advanced Corrosion‑Resistant Alloy for Industrial Applications

The general corrosion properties of NiCr21Mo6Cu with the material number 2.4641 are comparable with those of NiCr21Mo (material number 2.4858). It possesses a good resistance to reducing and oxidizing mediums and, due to the high Mo-content, it also is resistant to pitting in strongly chlorine-polluted mediums. Furthermore, the material is virtually insensitive to stress cracking corrosion. Among other things, it is applied in the production of phosphoric acid, in the offshore technology and in flue-gas washing devices. In the new edition of the DIN 17744 : 2002-09, the material is not contained any more.

Properties

General

PropertyTemperatureValue

Density

20.0 °C

8.3 g/cm³

Mechanical

PropertyTemperatureValue

Elastic modulus

20.0 °C

200 GPa

Elongation

100.0 °C

50 %

200.0 °C

50 %

300.0 °C

45 %

400.0 °C

50 %

500.0 °C

50 %

600.0 °C

50 %

Tensile strength

100.0 °C

620 MPa

200.0 °C

605 MPa

300.0 °C

580 MPa

400.0 °C

560 MPa

500.0 °C

550 MPa

600.0 °C

540 MPa

Yield strength Rp0.2

100.0 °C

290 MPa

200.0 °C

280 MPa

300.0 °C

250 MPa

400.0 °C

220 MPa

500.0 °C

215 MPa

600.0 °C

210 MPa

Yield strength Rp1.0

100.0 °C

310 MPa

200.0 °C

310 MPa

300.0 °C

280 MPa

400.0 °C

260 MPa

500.0 °C

255 MPa

600.0 °C

250 MPa

Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

23.0 °C

7.6E-6 - 1.7E-5 1/K

Typical for Nickel Chromium Alloy

Melting point

1400 °C

Typical for Nickel Chromium Alloy

Specific heat capacity

20.0 °C

500 J/(kg·K)

Thermal conductivity

20.0 °C

11 W/(m·K)

Electrical

PropertyTemperatureValue

Electrical resistivity

20.0 °C

1.1E-6 Ω·m

Chemical properties

PropertyValue

Aluminium

0.2 %

Carbon

0.025 %

Chromium

20 - 23 %

Cobalt

1 %

Copper

1.5 - 3 %

Iron

17.2 %

Manganese

1 %

Molybdenum

5.5 - 7 %

Nickel

39 - 46 %

Phosphorus

0.03 %

Silicon

0.5 %

Sulfur

0.015 %

Titanium

0.6 - 1 %


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