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SEW 555 23CrMo5 Steel – Quenched & Tempered (QT) for High‑Temperature Turbine Applications

High temperature steel for the turbine and generator construction.

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

207 GPa

200.0 °C

199 - 200 GPa

300.0 °C

192 - 193 GPa

400.0 °C

184 GPa

500.0 °C

175 GPa

600.0 °C

164 GPa

Elongation

20.0 °C

18 %

Elongation, transverse

20.0 °C

16 %

Poisson's ratio

23.0 °C

0.29 [-]

Typical for Chromium Molybdenum Steel

Reduction of area

20.0 °C

40 %

Reduction of area, transverse

20.0 °C

40 %

Tensile strength

20.0 °C

550 - 700 MPa

Tensile strength, transverse

20.0 °C

550 - 700 MPa

Yield strength Rp0.2

20.0 °C

400 MPa

100.0 °C

375 MPa

200.0 °C

350 MPa

250.0 °C

330 MPa

300.0 °C

305 MPa

350.0 °C

285 MPa

400.0 °C

265 MPa

450.0 °C

225 MPa

Yield strength Rp0.2, transverse

20.0 °C

400 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

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

41 - 42.7 W/(m·K)

200.0 °C

42.8 - 45 W/(m·K)

300.0 °C

41.6 - 46 W/(m·K)

400.0 °C

39.9 - 44 W/(m·K)

500.0 °C

37.8 - 39 W/(m·K)

600.0 °C

35.6 - 36 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

0.3 - 0.8 %

Molybdenum

0.2 - 0.35 %

Nickel

0.6 %

Phosphorus

0.02 %

Silicon

0.3 %

Sulfur

0.02 %


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