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EN 10089 Grade 38Si7 Quenched & Tempered Steel – Ideal for Springs & Load‑Securing Applications

The steel 38Si7 is used for spring rings, spring plates, screw locks and load securing devices.

Properties

General

PropertyTemperatureValue

Density

20.0 °C

7.78 - 7.85 g/cm³

Mechanical

PropertyTemperatureValueComment

Elastic modulus

-100.0 °C

217 GPa

20.0 °C

210 - 212 GPa

100.0 °C

206 - 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

8 %

Poisson's ratio

23.0 °C

0.3 [-]

Typical for Steel

Reduction of area

20.0 °C

35 %

Shear modulus

20.0 °C

80 GPa

Tensile strength

20.0 °C

1300 - 1600 MPa

Yield strength Rp0.2

20.0 °C

1150 MPa

Thermal

PropertyTemperatureValue

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

Specific heat capacity

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

34.1 W/(m·K)

100.0 °C

35.2 W/(m·K)

200.0 °C

36.5 W/(m·K)

300.0 °C

36.7 W/(m·K)

400.0 °C

35.8 W/(m·K)

500.0 °C

34.5 W/(m·K)

600.0 °C

32.9 W/(m·K)

Thermal diffusivity

20.0 °C

9.5 mm²/s

100.0 °C

9.2 mm²/s

200.0 °C

8.9 mm²/s

300.0 °C

8.3 mm²/s

400.0 °C

7.7 mm²/s

500.0 °C

6.7 mm²/s

600.0 °C

5.6 mm²/s

Electrical

PropertyTemperatureValue

Electrical resistivity

20.0 °C

3.05E-7 Ω·m

100.0 °C

3.64E-7 Ω·m

200.0 °C

4.32E-7 Ω·m

300.0 °C

5.12E-7 Ω·m

400.0 °C

6.07E-7 Ω·m

500.0 °C

7.16E-7 Ω·m

600.0 °C

8.42E-7 Ω·m

Chemical properties

PropertyValue

Carbon

0.35 - 0.42 %

Manganese

0.5 - 0.8 %

Phosphorus

0.03 %

Silicon

1.5 - 1.8 %

Sulfur

0.025 %

Technological properties

Property
Features

Spring


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