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EN 10132-4 Grade 71Si7 Cold Rolled, Quenched & Tempered Steel – Ideal for High-Load Tension Springs

The steel 71 Si 7 is used for highest loaded tension springs in the clock engineering and similar applications up to 3.0 mm sheet thicknesses.

Properties

General

PropertyTemperatureValue

Density

20.0 °C

7.78 g/cm³

Mechanical

PropertyTemperatureValue

Elastic modulus

-100.0 °C

217 GPa

20.0 °C

206 - 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

Hardness, Vickers

20.0 °C

445 - 650 [-]

Shear modulus

20.0 °C

78 GPa

Tensile strength

20.0 °C

1500 - 2200 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

0.68 - 0.75 %

Manganese

0.6 - 0.8 %

Phosphorus

0.04 %

Silicon

1.5 - 1.8 %

Sulfur

0.035 %


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