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DIN 17240 Grade 24CrMo5 Quenched & Tempered – High‑Temperature Steel for Chemical & Turbine Applications

High temperature steel for screws and nuts in the chemical industry as well as for forgings in the steam turbine construction up to 530 °C.

Properties

General

PropertyTemperatureValue

Density

20.0 °C

7.83 g/cm³

Mechanical

PropertyTemperatureValueComment

Elastic modulus

-100.0 °C

217 GPa

20.0 °C

212 GPa

100.0 °C

204 - 207 GPa

200.0 °C

196 - 199 GPa

300.0 °C

186 - 192 GPa

400.0 °C

177 - 184 GPa

500.0 °C

164 - 175 GPa

600.0 °C

127 - 164 GPa

Elongation

20.0 °C

18 %

Poisson's ratio

23.0 °C

0.29 [-]

Typical for Chromium Molybdenum Steel

Reduction of area

20.0 °C

60 %

Tensile strength

20.0 °C

600 - 750 MPa

300.0 °C

460 MPa

350.0 °C

440 MPa

Yield strength Rp0.2

20.0 °C

420 - 440 MPa

200.0 °C

382 - 412 MPa

250.0 °C

372 - 392 MPa

300.0 °C

344 - 363 MPa

350.0 °C

324 - 333 MPa

400.0 °C

294 - 304 MPa

450.0 °C

265 - 275 MPa

500.0 °C

226 - 235 MPa

Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

-100.0 °C

1.05E-5 1/K

20.0 °C

1.15E-5 1/K

100.0 °C

1.11E-5 - 1.21E-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 - 1.36E-5 1/K

500.0 °C

1.39E-5 - 1.4E-5 1/K

600.0 °C

1.41E-5 - 1.44E-5 1/K

Max service temperature, long

0 - 530 °C

Melting point

1382 - 1529 °C

Typical for Chromium Molybdenum Steel

Specific heat capacity

-100.0 °C

423 J/(kg·K)

20.0 °C

461 J/(kg·K)

100.0 °C

479 J/(kg·K)

200.0 °C

499 J/(kg·K)

300.0 °C

517 J/(kg·K)

400.0 °C

536 J/(kg·K)

500.0 °C

558 J/(kg·K)

600.0 °C

587 J/(kg·K)

Thermal conductivity

20.0 °C

41 W/(m·K)

100.0 °C

42.7 W/(m·K)

200.0 °C

42.8 W/(m·K)

300.0 °C

41.6 W/(m·K)

400.0 °C

39.9 W/(m·K)

500.0 °C

37.8 W/(m·K)

600.0 °C

35.6 W/(m·K)

Thermal diffusivity

20.0 °C

11.4 mm²/s

100.0 °C

11 mm²/s

200.0 °C

10.3 mm²/s

300.0 °C

9.5 mm²/s

400.0 °C

8.5 mm²/s

500.0 °C

7.3 mm²/s

600.0 °C

6 mm²/s

Electrical

PropertyTemperatureValue

Electrical resistivity

20.0 °C

2.54E-7 Ω·m

100.0 °C

3E-7 Ω·m

200.0 °C

3.69E-7 Ω·m

300.0 °C

4.51E-7 Ω·m

400.0 °C

5.45E-7 Ω·m

500.0 °C

6.54E-7 Ω·m

600.0 °C

7.78E-7 Ω·m

Chemical properties

PropertyValue

Carbon

0.2 - 0.28 %

Chromium

0.9 - 1.2 %

Manganese

0.5 - 0.8 %

Molybdenum

0.2 - 0.35 %

Nickel

0.6 %

Phosphorus

0.04 %

Silicon

0.4 %

Sulfur

0.035 %


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