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DIN 1651 Grade 45S20: Precision‑Machined, Quenched & Tempered Steel

The fully killed machining steel 45 S 20 is used for mass parts of higher strength, especially for lower toughness demands cross-sectional. It has advantages regarding a higher cutting speed. Application in the automotive engineering, toolbuilding, apparatus engineering (screws, nuts, smal parts).

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

207 GPa

200.0 °C

193 - 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

10 - 14 %

Poisson's ratio

25.0 °C

0.28 [-]

Shear modulus

20.0 °C

81 GPa

Tensile strength

20.0 °C

620 - 840 MPa

Yield strength

20.0 °C

375 - 480 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

1.1E-5 - 1.25E-5 1/K

200.0 °C

1.18E-5 - 1.3E-5 1/K

300.0 °C

1.36E-5 1/K

400.0 °C

1.32E-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 J/(kg·K)

100.0 °C

479 - 490 J/(kg·K)

200.0 °C

499 - 530 J/(kg·K)

300.0 °C

517 J/(kg·K)

400.0 °C

536 - 600 J/(kg·K)

500.0 °C

558 J/(kg·K)

600.0 °C

587 J/(kg·K)

Thermal conductivity

20.0 °C

41.7 - 49 W/(m·K)

100.0 °C

43.4 W/(m·K)

200.0 °C

43.2 W/(m·K)

300.0 °C

41.4 W/(m·K)

400.0 °C

39.1 W/(m·K)

500.0 °C

36.7 W/(m·K)

600.0 °C

34.1 W/(m·K)

Thermal diffusivity

20.0 °C

11.6 mm²/s

100.0 °C

11.3 mm²/s

200.0 °C

10.5 mm²/s

300.0 °C

9.5 mm²/s

400.0 °C

8.3 mm²/s

500.0 °C

7.1 mm²/s

600.0 °C

5.8 mm²/s

Electrical

PropertyTemperatureValue

Electrical resistivity

20.0 °C

1.2E-7 - 2.5E-7 Ω·m

100.0 °C

2.95E-7 Ω·m

200.0 °C

3.65E-7 Ω·m

300.0 °C

4.53E-7 Ω·m

400.0 °C

5.56E-7 Ω·m

500.0 °C

6.74E-7 Ω·m

600.0 °C

8.13E-7 Ω·m

Chemical properties

PropertyValue

Carbon

0.42 - 0.5 %

Manganese

0.7 - 1.1 %

Phosphorus

0.06 %

Silicon

0.1 - 0.3 %

Sulfur

0.18 - 0.25 %


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