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DIN 17221 Grade 51CrMoV4 Annealed for Spheroidized Carbides (+AC) – High‑Performance Hot‑Formed Springs

The steel 51 CrMoV 4 is used for hot formed springs, like high loaded car torsion springs, helical springs, tension springs and compression springs.

Properties

General

PropertyTemperatureValue

Density

20.0 °C

7.83 - 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

184 GPa

500.0 °C

175 GPa

600.0 °C

164 GPa

Poisson's ratio

20.0 °C

0.28 [-]

Shear modulus

20.0 °C

81 GPa

Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

-100.0 °C

1.05E-5 1/K

20.0 °C

1.15E-5 1/K

100.0 °C

1.11E-5 - 1.21E-5 1/K

200.0 °C

1.21E-5 - 1.27E-5 1/K

300.0 °C

1.29E-5 - 1.32E-5 1/K

400.0 °C

1.35E-5 - 1.36E-5 1/K

500.0 °C

1.4E-5 1/K

600.0 °C

1.44E-5 1/K

Max service temperature, long

-30 - 100 °C

Melting point

1382 - 1529 °C

Typical for Chromium Molybdenum Steel

Specific heat capacity

-100.0 °C

423 J/(kg·K)

20.0 °C

460 - 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

42 - 45.1 W/(m·K)

100.0 °C

45.1 W/(m·K)

200.0 °C

44.1 W/(m·K)

300.0 °C

41.9 W/(m·K)

400.0 °C

39.4 W/(m·K)

500.0 °C

36.9 W/(m·K)

600.0 °C

34.4 W/(m·K)

Thermal diffusivity

20.0 °C

12.5 mm²/s

100.0 °C

11.6 mm²/s

200.0 °C

10.6 mm²/s

300.0 °C

9.5 mm²/s

400.0 °C

8.4 mm²/s

500.0 °C

7.1 mm²/s

600.0 °C

5.8 mm²/s

Electrical

PropertyTemperatureValue

Electrical resistivity

20.0 °C

1.9E-7 - 2.31E-7 Ω·m

100.0 °C

2.84E-7 Ω·m

200.0 °C

3.58E-7 Ω·m

300.0 °C

4.48E-7 Ω·m

400.0 °C

5.52E-7 Ω·m

500.0 °C

6.71E-7 Ω·m

600.0 °C

8.06E-7 Ω·m

Chemical properties

PropertyValue

Carbon

0.48 - 0.56 %

Chromium

0.9 - 1.2 %

Manganese

0.7 - 1.1 %

Molybdenum

0.15 - 0.25 %

Phosphorus

0.03 %

Silicon

0.15 - 0.4 %

Sulfur

0.03 %

Vanadium

0.08 - 0.15 %

Technological properties

Property
Features

Spring


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