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EN 10263‑4 Grade 34CrMo4: Cold‑Drawn, Annealed Steel with Spheroidized Carbides – Ideal for High‑Strength Fasteners

The cold-upsettable steel 34 CrMo 4 can be cold-formed with a medium to high rate of forming according to the usual forming methods on single-stage and multi-stage presses. It is used for hexagon screws and hexagon socket head cap screw of strength class 8.8 in the thick dimension range, of strength class 10.9 in the medium and of strength class 12.9 in the thin dimension range it is used for high-strength parts manufactured according to drawings.

Properties

General

PropertyTemperatureValue

Density

20.0 °C

7.81 g/cm³

Mechanical

PropertyTemperatureValue

Elastic modulus

-100.0 °C

217 GPa

20.0 °C

210.27 - 212 GPa

100.0 °C

205.17 - 207 GPa

200.0 °C

198.68 - 199 GPa

300.0 °C

191.11 - 192 GPa

400.0 °C

182.31 - 184 GPa

500.0 °C

171.64 - 175 GPa

600.0 °C

164 GPa

Poisson's ratio

20.0 °C

0.28 [-]

100.0 °C

0.29 [-]

200.0 °C

0.3 [-]

300.0 °C

0.3 [-]

400.0 °C

0.3 [-]

500.0 °C

0.31 [-]

Reduction of area

20.0 °C

61 %

Shear modulus

20.0 °C

81.88 GPa

100.0 °C

79.57 GPa

200.0 °C

76.63 GPa

300.0 °C

73.54 GPa

400.0 °C

69.99 GPa

500.0 °C

65.66 GPa

Tensile strength

20.0 °C

590 - 610 MPa

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

1.21E-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

Melting point

1382 - 1529 °C

Typical for Chromium Molybdenum Steel

Specific heat capacity

-100.0 °C

423 J/(kg·K)

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

39.6 W/(m·K)

100.0 °C

41.6 W/(m·K)

200.0 °C

41.8 W/(m·K)

300.0 °C

40.3 W/(m·K)

400.0 °C

38.2 W/(m·K)

500.0 °C

36 W/(m·K)

600.0 °C

33.6 W/(m·K)

Thermal diffusivity

20.0 °C

11 mm²/s

100.0 °C

10.8 mm²/s

200.0 °C

10.1 mm²/s

300.0 °C

9.2 mm²/s

400.0 °C

8.1 mm²/s

500.0 °C

7 mm²/s

600.0 °C

5.7 mm²/s

Electrical

PropertyTemperatureValue

Electrical resistivity

20.0 °C

2.63E-7 Ω·m

100.0 °C

3.08E-7 Ω·m

200.0 °C

3.78E-7 Ω·m

300.0 °C

4.66E-7 Ω·m

400.0 °C

5.69E-7 Ω·m

500.0 °C

6.87E-7 Ω·m

600.0 °C

8.26E-7 Ω·m

Chemical properties

PropertyValue

Carbon

0.3 - 0.37 %

Chromium

0.9 - 1.2 %

Manganese

0.6 - 0.9 %

Molybdenum

0.15 - 0.3 %

Phosphorus

0.04 %

Silicon

0.4 %

Sulfur

0.035 %


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