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EN 10263-4 Grade 28B2 Steel – Annealed for Spheroidized Carbides and Precision Turning

The cold-upsettable steel 28 B 2 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 Phillips screws of strength class 8.8 in the thick and medium dimension range and for nuts of strength classes 8 and 10.

Properties

General

PropertyTemperatureValue

Density

20.0 °C

7.82 g/cm³

Mechanical

PropertyTemperatureValueComment

Elastic modulus

-100.0 °C

217 GPa

20.0 °C

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

Poisson's ratio

23.0 °C

0.29 [-]

Typical for Low Carbon Steel

Reduction of area

20.0 °C

62 %

Shear modulus

23.0 °C

82 GPa

Typical for Low Carbon Steel

Tensile strength

20.0 °C

540 MPa

Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

-100.0 °C

1.08E-5 1/K

20.0 °C

1.19E-5 1/K

100.0 °C

1.25E-5 1/K

200.0 °C

1.3E-5 1/K

300.0 °C

1.36E-5 1/K

400.0 °C

1.41E-5 1/K

500.0 °C

1.45E-5 1/K

600.0 °C

1.49E-5 1/K

Max service temperature

500 °C

Typical for Carbon Steel

Melting point

1480 - 1526 °C

Typical for Low Carbon 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

48 W/(m·K)

100.0 °C

48.9 W/(m·K)

200.0 °C

47.5 W/(m·K)

300.0 °C

44.7 W/(m·K)

400.0 °C

41.6 W/(m·K)

500.0 °C

38.6 W/(m·K)

600.0 °C

35.5 W/(m·K)

Thermal diffusivity

20.0 °C

13.3 mm²/s

100.0 °C

12.6 mm²/s

200.0 °C

11.5 mm²/s

300.0 °C

10.2 mm²/s

400.0 °C

8.9 mm²/s

500.0 °C

7.5 mm²/s

600.0 °C

6 mm²/s

Electrical

PropertyTemperatureValue

Electrical resistivity

20.0 °C

2.17E-7 Ω·m

100.0 °C

2.62E-7 Ω·m

200.0 °C

3.32E-7 Ω·m

300.0 °C

4.2E-7 Ω·m

400.0 °C

5.23E-7 Ω·m

500.0 °C

6.41E-7 Ω·m

600.0 °C

7.8E-7 Ω·m

Magnetic

PropertyValueComment

Curie temperature

770 °C

Typical for Low Carbon Steel

Chemical properties

PropertyValue

Boron

1E-3 - 5E-3 %

Carbon

0.25 - 0.32 %

Manganese

0.5 - 0.8 %

Phosphorus

0.04 %

Silicon

0.4 %

Sulfur

0.035 %


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