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EN 10269 Grade 42CrMo4 Quenched & Tempered (QT) – High‑Performance Steel for Heavy‑Duty Applications

Steel 42CrMo4 is suitable for high-stress components (also large forged parts) in vehicle, engine and machine engineering with high wear resistance and very favorable core properties ( e.g. crankshafts, pinions, balance shafts). The steel shows a high resistivity to static and dynamic loading. Lowest working temperature -40 °C Further application for mounting elements at increased and lower temperatures.

Properties

General

PropertyTemperatureValue

Density

20.0 °C

7.83 - 7.85 g/cm³

Mechanical

PropertyTemperatureValue

Elastic modulus

-100.0 °C

217 GPa

20.0 °C

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

14 %

Poisson's ratio

20.0 °C

0.28 [-]

Reduction of area

20.0 °C

50 %

Tensile strength

20.0 °C

860 - 1060 MPa

Yield strength Rp0.2

20.0 °C

730 MPa

50.0 °C

720 MPa

100.0 °C

702 MPa

150.0 °C

677 MPa

200.0 °C

640 MPa

250.0 °C

602 MPa

300.0 °C

562 MPa

350.0 °C

518 MPa

400.0 °C

475 MPa

450.0 °C

420 MPa

500.0 °C

375 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 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

45.1 W/(m·K)

100.0 °C

45.1 W/(m·K)

200.0 °C

44.1 W/(m·K)

300.0 °C

41.9 W/(m·K)

400.0 °C

39.4 W/(m·K)

500.0 °C

36.9 W/(m·K)

600.0 °C

34.4 W/(m·K)

Thermal diffusivity

20.0 °C

12.5 mm²/s

100.0 °C

11.6 mm²/s

200.0 °C

10.6 mm²/s

300.0 °C

9.5 mm²/s

400.0 °C

8.4 mm²/s

500.0 °C

7.1 mm²/s

600.0 °C

5.8 mm²/s

Electrical

PropertyTemperatureValue

Electrical resistivity

20.0 °C

2.31E-7 Ω·m

100.0 °C

2.84E-7 Ω·m

200.0 °C

3.58E-7 Ω·m

300.0 °C

4.48E-7 Ω·m

400.0 °C

5.52E-7 Ω·m

500.0 °C

6.71E-7 Ω·m

600.0 °C

8.06E-7 Ω·m

Chemical properties

PropertyValue

Carbon

0.38 - 0.45 %

Chromium

0.9 - 1.2 %

Manganese

0.6 - 0.9 %

Molybdenum

0.15 - 0.3 %

Phosphorus

0.03 - 0.04 %

Silicon

0.4 %

Sulfur

0.035 %


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