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EN 10263-4 Grade 19MnB4 – Cold-Drawn & Annealed Steel with Spheroidized Carbides for High-Strength Fasteners

The cold-upsettable steel 19 MnB 4 can be cold-formed in rolling-hard condition with a low to medium forming rate and in the heat-treated conditions GKZ and K+GKZ+K with a high forming degree. It is used in the un-annealed condition for hexagon screws and hexagon socket head cap screws of the strength class 8.8 in the small and medium dimension range. In the annealed condition it can be used for difficult molded parts.

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

20.0 °C

0.29 [-]

Typical for Low Carbon Steel

Reduction of area

20.0 °C

62 - 64 %

Tensile strength

20.0 °C

500 - 520 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

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

39.6 W/(m·K)

100.0 °C

41 W/(m·K)

200.0 °C

41 W/(m·K)

300.0 °C

39.9 W/(m·K)

400.0 °C

38.1 W/(m·K)

500.0 °C

35.9 W/(m·K)

600.0 °C

33.6 W/(m·K)

Thermal diffusivity

20.0 °C

11 mm²/s

100.0 °C

10.6 mm²/s

200.0 °C

9.9 mm²/s

300.0 °C

9 mm²/s

400.0 °C

8.1 mm²/s

500.0 °C

6.9 mm²/s

600.0 °C

5.7 mm²/s

Electrical

PropertyTemperatureValue

Electrical resistivity

20.0 °C

2.63E-7 Ω·m

100.0 °C

3.12E-7 Ω·m

200.0 °C

3.85E-7 Ω·m

300.0 °C

4.7E-7 Ω·m

400.0 °C

5.71E-7 Ω·m

500.0 °C

6.88E-7 Ω·m

600.0 °C

8.25E-7 Ω·m

Magnetic

PropertyValueComment

Curie temperature

770 °C

Typical for Low Carbon Steel

Chemical properties

PropertyValue

Boron

1E-3 - 5E-3 %

Carbon

0.17 - 0.24 %

Manganese

0.8 - 1.15 %

Phosphorus

0.04 %

Silicon

0.4 %

Sulfur

0.035 %


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