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DIN 17742 Grade NiCr20TiAl Precipitation Hardened Alloy (+P): High Creep & Scale Resistance

The highly creep-resistant aviation material NiCr20TiAl with the material number 2.4631 is contained in the Werkstoff-Leistungsblatt der Deutschen Luftfahrt editions WL 2.4631-1 : 1993-08, WL 2.4631-2 : 1993-08 and WL 2.4631-100 : 1993-08. DIN 17742 among other things contains the material NiCr20TiAl with the material number 2.4952. The material is hardenable, highly creep-resistant and scale-resistant up to about 1000 °C. NiCr20TiAl is corrosion-resistant, yet vanadin-pentoxide, sodium- und sulphur compounds can lead to hot-gas corrosion. Application for gas turbine blades, gas turbine rings and discs as well as for screws for operating temperatures up to about 815 °C. Processing properties: Formability: good (annealed) Weldability: possible, but not common (Werkstoff-Leistungsblatt der Deutschen Luftfahrt/WL: material specification of the German aviation)

Properties

General

PropertyTemperatureValue

Density

20.0 °C

8.2 - 8.3 g/cm³

Mechanical

PropertyTemperatureValue

Elastic modulus

20.0 °C

215 - 222 GPa

100.0 °C

212 - 217 GPa

200.0 °C

205 - 210 GPa

300.0 °C

202 - 204 GPa

400.0 °C

195 - 197 GPa

450.0 °C

193 GPa

500.0 °C

189 - 191 GPa

550.0 °C

184 GPa

600.0 °C

179 - 183 GPa

700.0 °C

161 - 176 GPa

800.0 °C

130 - 166 GPa

900.0 °C

150 - 153 GPa

1000.0 °C

140 GPa

Elongation

20.0 °C

12 - 20 %

Elongation, transverse

20.0 °C

15 - 25 %

Hardness, Brinell

20.0 °C

277 [-]

Reduction of area

20.0 °C

12 - 25 %

Tensile strength

20.0 °C

1000 - 1400 MPa

Tensile strength, transverse

20.0 °C

1030 MPa

Yield strength Rp0.2

20.0 °C

600 - 725 MPa

200.0 °C

568 - 745 MPa

250.0 °C

564 MPa

300.0 °C

560 - 735 MPa

350.0 °C

550 MPa

400.0 °C

540 - 726 MPa

450.0 °C

530 MPa

500.0 °C

520 - 716 MPa

550.0 °C

510 MPa

600.0 °C

500 - 696 MPa

650.0 °C

480 MPa

700.0 °C

628 MPa

800.0 °C

431 MPa

900.0 °C

196 MPa

1000.0 °C

39 MPa

Yield strength Rp0.2, transverse

20.0 °C

640 MPa

Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

100.0 °C

1.11E-5 - 1.19E-5 1/K

200.0 °C

1.21E-5 - 1.27E-5 1/K

300.0 °C

1.29E-5 - 1.32E-5 1/K

400.0 °C

1.35E-5 - 1.37E-5 1/K

500.0 °C

1.37E-5 - 1.41E-5 1/K

600.0 °C

1.4E-5 - 1.48E-5 1/K

700.0 °C

1.45E-5 - 1.55E-5 1/K

800.0 °C

1.51E-5 - 1.63E-5 1/K

900.0 °C

1.58E-5 - 1.74E-5 1/K

1000.0 °C

1.88E-5 1/K

Max service temperature, long

0 - 1000 °C

Melting point

1400 °C

Typical for Nickel Chromium Alloy

Specific heat capacity

20.0 °C

430 - 460 J/(kg·K)

100.0 °C

590 J/(kg·K)

200.0 °C

590 J/(kg·K)

300.0 °C

590 J/(kg·K)

400.0 °C

590 J/(kg·K)

450.0 °C

590 J/(kg·K)

500.0 °C

590 J/(kg·K)

550.0 °C

590 J/(kg·K)

600.0 °C

590 J/(kg·K)

700.0 °C

590 J/(kg·K)

800.0 °C

590 J/(kg·K)

Thermal conductivity

20.0 °C

13 W/(m·K)

100.0 °C

12 - 14 W/(m·K)

200.0 °C

15 W/(m·K)

300.0 °C

16 W/(m·K)

400.0 °C

17 W/(m·K)

500.0 °C

18 W/(m·K)

600.0 °C

20 W/(m·K)

700.0 °C

23 W/(m·K)

800.0 °C

25 W/(m·K)

900.0 °C

28 W/(m·K)

Electrical

PropertyTemperatureValue

Electrical resistivity

20.0 °C

1.24E-6 Ω·m

Chemical properties

PropertyValue

Aluminium

1 - 1.8 %

Boron

8E-3 %

Carbon

0.04 - 0.1 %

Chromium

18 - 21 %

Cobalt

1 - 2 %

Copper

0.2 %

Iron

1.5 - 3 %

Manganese

1 %

Nickel

65 - 68.7 %

Phosphorus

0.02 - 0.03 %

Silicon

1 %

Sulfur

0.015 %

Titanium

1.8 - 2.7 %


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