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EN 10263-4 Grade 42CrMo4: Cold-Drawn, Annealed Steel with Spheroidized Carbides

The cold-upsettable steel 42 CrMo 4 can be cold-formed according to the usual forming methods on single-stage and multi-stage presses. Because of its high carbon content, only low to medium forming degrees are recommendable. It is used for screws of strength class 10.9 in the thick and of strength class 12.9 in the medium to thin dimension range.

Properties

General

PropertyTemperatureValue

Density

20.0 °C

7.83 g/cm³

Mechanical

PropertyTemperatureValue

Elastic modulus

-100.0 °C

217 GPa

20.0 °C

212 GPa

100.0 °C

207 GPa

200.0 °C

199 GPa

300.0 °C

192 GPa

400.0 °C

184 GPa

500.0 °C

175 GPa

600.0 °C

164 GPa

Poisson's ratio

20.0 °C

0.28 [-]

Reduction of area

20.0 °C

60 %

Tensile strength

20.0 °C

610 - 630 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

1.21E-5 1/K

200.0 °C

1.27E-5 1/K

300.0 °C

1.32E-5 1/K

400.0 °C

1.36E-5 1/K

500.0 °C

1.4E-5 1/K

600.0 °C

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

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

0.04 %

Silicon

0.4 %

Sulfur

0.035 %


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