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EN 10263-3 Grade 21NiCrMo2 Steel – Annealed for Optimal Spheroidized Carbides (+AC)

The cold-upsettable steel 21 NiCrMo 2 is suitable for the manufacture of screws and nuts (soft-annealed condition with pre- and/or post treatment) used in automobile, motor and equipment construction and in general engineering. The steel finds additional use, amongst other things, for drive sprockets, gudgeon pins, gear shafts (for example in case-hardened condition).

Properties

General

PropertyTemperatureValue

Density

20.0 °C

7.84 g/cm³

Mechanical

PropertyTemperatureValue

Elastic modulus

-100.0 °C

217 GPa

20.0 °C

212 - 212.78 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

Poisson's ratio

20.0 °C

0.29 [-]

Reduction of area

20.0 °C

59 %

Shear modulus

20.0 °C

82.8 GPa

Tensile strength

20.0 °C

590 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 Nickel 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

46.3 W/(m·K)

100.0 °C

47.1 W/(m·K)

200.0 °C

46.2 W/(m·K)

300.0 °C

44.1 W/(m·K)

400.0 °C

41.3 W/(m·K)

500.0 °C

38.6 W/(m·K)

600.0 °C

35.9 W/(m·K)

Thermal diffusivity

20.0 °C

12.8 mm²/s

100.0 °C

12.1 mm²/s

200.0 °C

11.1 mm²/s

300.0 °C

10 mm²/s

400.0 °C

8.8 mm²/s

500.0 °C

7.4 mm²/s

600.0 °C

4.7 mm²/s

Electrical

PropertyTemperatureValue

Electrical resistivity

20.0 °C

2.25E-7 Ω·m

100.0 °C

2.72E-7 Ω·m

200.0 °C

3.42E-7 Ω·m

300.0 °C

4.26E-7 Ω·m

400.0 °C

5.26E-7 Ω·m

500.0 °C

6.4E-7 Ω·m

600.0 °C

7.73E-7 Ω·m

Chemical properties

PropertyValue

Carbon

0.17 - 0.23 %

Chromium

0.4 - 0.7 %

Manganese

0.65 - 0.95 %

Molybdenum

0.15 - 0.25 %

Nickel

0.4 - 0.7 %

Phosphorus

0.04 %

Silicon

0.4 %

Sulfur

0.035 %


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