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EN 10083-2 Grade C40 Steel – Quenched & Tempered (QT) for High-Performance Applications

Steel C40 is suitable for larger forged parts in vehicle manufacturing and machine engineering (e.g. road wheels, axles).

Properties

General

PropertyTemperatureValue

Density

20.0 °C

7.8 - 7.85 g/cm³

Mechanical

PropertyTemperatureValue

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

175 - 184 GPa

500.0 °C

175 GPa

600.0 °C

164 GPa

Elongation

20.0 °C

16 - 19 %

Poisson's ratio

20.0 °C

0.28 [-]

Reduction of area

20.0 °C

35 - 45 %

Shear modulus

20.0 °C

81 GPa

Tensile strength

20.0 °C

600 - 800 MPa

Yield strength

20.0 °C

350 - 460 MPa

Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

-100.0 °C

1.08E-5 1/K

20.0 °C

1.19E-5 1/K

100.0 °C

1.11E-5 - 1.25E-5 1/K

200.0 °C

1.21E-5 - 1.3E-5 1/K

300.0 °C

1.29E-5 - 1.36E-5 1/K

400.0 °C

1.35E-5 - 1.41E-5 1/K

500.0 °C

1.45E-5 1/K

600.0 °C

1.49E-5 1/K

Max service temperature

500 °C

Typical for Carbon Steel

Melting point

1380 - 1514 °C

Typical for Medium Carbon Steel

Specific heat capacity

-100.0 °C

423 J/(kg·K)

20.0 °C

461 - 480 J/(kg·K)

100.0 °C

479 - 500 J/(kg·K)

200.0 °C

499 - 550 J/(kg·K)

300.0 °C

517 - 590 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

44.9 - 52 W/(m·K)

100.0 °C

46.2 - 50.6 W/(m·K)

200.0 °C

45.5 - 48.1 W/(m·K)

300.0 °C

43.1 - 45.7 W/(m·K)

400.0 °C

40.4 W/(m·K)

500.0 °C

37.7 W/(m·K)

600.0 °C

34.9 W/(m·K)

Thermal diffusivity

20.0 °C

12.5 mm²/s

100.0 °C

12 mm²/s

200.0 °C

11 mm²/s

300.0 °C

9.8 mm²/s

400.0 °C

8.6 mm²/s

500.0 °C

7.3 mm²/s

600.0 °C

5.9 mm²/s

Electrical

PropertyTemperatureValue

Electrical resistivity

20.0 °C

1.2E-7 - 2.32E-7 Ω·m

100.0 °C

2.77E-7 Ω·m

200.0 °C

3.47E-7 Ω·m

300.0 °C

4.35E-7 Ω·m

400.0 °C

5.38E-7 Ω·m

500.0 °C

6.56E-7 Ω·m

600.0 °C

7.95E-7 Ω·m

Chemical properties

PropertyValue

Carbon

0.37 - 0.44 %

Chromium

0.4 %

Copper

0.3 %

Manganese

0.5 - 0.8 %

Molybdenum

0.1 %

Nickel

0.4 %

Phosphorus

0.05 %

Silicon

0.1 - 0.4 %

Sulfur

0.045 %


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