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EN 10277-5 Grade 34CrNiMo6 Quenched, Tempered, and Cold‑Drawn Steel (+QT+C) – High‑Strength, Low‑Temperature Performance

Steel 25CrMoS4 is suitable for high loaded parts (also heavy forged parts) of high heat-treatment sections as well as favorable ductility qualities in aircraft, heavy vehicle and machine engineering (e.g. propellershafts, connecting rods, transmission shafts). Lowest application temperature -40°C. As a bright steel product it is used in the form of bars, bright, straight, in various conditions (see DIN EN 10277 : 1999-10).

Properties

General

PropertyTemperatureValue

Density

20.0 °C

7.8 - 7.85 g/cm³

Mechanical

PropertyTemperatureValueComment

Elastic modulus

-100.0 °C

217 GPa

20.0 °C

210 - 212 GPa

100.0 °C

205 - 207 GPa

200.0 °C

195 - 199 GPa

300.0 °C

185 - 192 GPa

400.0 °C

184 GPa

500.0 °C

175 GPa

600.0 °C

164 GPa

Elongation

20.0 °C

8 - 10 %

Poisson's ratio

23.0 °C

0.29 [-]

Typical for Nickel Chromium Molybdenum Steel

Shear modulus

20.0 °C

81 GPa

Tensile strength

20.0 °C

1000 - 1200 MPa

Yield strength Rp0.2

20.0 °C

650 - 950 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

1.4E-5 1/K

600.0 °C

1.44E-5 1/K

Max service temperature, long

-40 - 0 °C

Melting point

1382 - 1529 °C

Typical for Nickel Chromium Molybdenum Steel

Specific heat capacity

-100.0 °C

423 J/(kg·K)

20.0 °C

460 - 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

33.7 - 42 W/(m·K)

100.0 °C

36.2 - 50.3 W/(m·K)

200.0 °C

37.8 - 49 W/(m·K)

300.0 °C

37.2 - 47.8 W/(m·K)

400.0 °C

35.7 W/(m·K)

500.0 °C

34 W/(m·K)

600.0 °C

32 W/(m·K)

Thermal diffusivity

20.0 °C

9.4 mm²/s

100.0 °C

9.4 mm²/s

200.0 °C

9.2 mm²/s

300.0 °C

8.5 mm²/s

400.0 °C

7.6 mm²/s

500.0 °C

6.6 mm²/s

600.0 °C

5.4 mm²/s

Electrical

PropertyTemperatureValue

Electrical resistivity

20.0 °C

1.9E-7 - 3.09E-7 Ω·m

100.0 °C

3.54E-7 Ω·m

200.0 °C

4.18E-7 Ω·m

300.0 °C

5.05E-7 Ω·m

400.0 °C

6.09E-7 Ω·m

500.0 °C

7.27E-7 Ω·m

600.0 °C

8.67E-7 Ω·m

Chemical properties

PropertyValue

Carbon

0.3 - 0.38 %

Chromium

1.3 - 1.7 %

Manganese

0.5 - 0.8 %

Molybdenum

0.15 - 0.3 %

Nickel

1.3 - 1.7 %

Phosphorus

0.03 - 0.04 %

Silicon

0.4 %

Sulfur

0.035 %


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