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EN 10087 Grade 46SPb20 – Quenched & Tempered Steel for Automotive & Machine Parts

The free-cutting steel 46SPb20, suitable for quenching and tempering, is used for bulk parts of higher strength, especially for lower requirements to ductility in transversal direction opposite to comparable C-steels (e.g. C45). Machinability enhancement is achievable by Pb-content. Application in automotive engineering, as well as in apparatus equipment and machine engineering (e.g. screws, nuts, small-size parts).

Properties

General

PropertyTemperatureValue

Density

20.0 °C

7.85 g/cm³

Mechanical

PropertyTemperatureValueComment

Elastic modulus

20.0 °C

210 GPa

200.0 °C

193 GPa

300.0 °C

185 GPa

400.0 °C

175 GPa

Elongation

20.0 °C

12 - 14 %

Poisson's ratio

23.0 °C

0.29 [-]

Typical for Medium Carbon Steel

Shear modulus

20.0 °C

81 GPa

Tensile strength

20.0 °C

630 - 850 MPa

Yield strength

20.0 °C

370 - 490 MPa

Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

100.0 °C

1.1E-5 1/K

200.0 °C

1.18E-5 1/K

400.0 °C

1.32E-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

490 J/(kg·K)

200.0 °C

530 J/(kg·K)

400.0 °C

600 J/(kg·K)

Thermal conductivity

20.0 °C

49 W/(m·K)

Electrical

PropertyTemperatureValue

Electrical resistivity

20.0 °C

1.2E-7 Ω·m

Chemical properties

PropertyValue

Carbon

0.42 - 0.5 %

Lead

0.15 - 0.35 %

Manganese

0.7 - 1.1 %

Phosphorus

0.06 %

Silicon

0.4 %

Sulfur

0.15 - 0.25 %


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