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DIN 1651 9SMn28 Steel – Untreated, Premium Machining Grade

Balanced machining steel 9 SMn 28 is the standard grade for all mass turning tools and should be the substitution of the 9 S 20. The steel is suited for thin walled parts and little cold forming. Application: automotive engineering, toolbuilding, apparatus engineering

Properties

General

PropertyTemperatureValue

Density

20.0 °C

7.85 g/cm³

Mechanical

PropertyTemperatureValue

Elastic modulus

-100.0 °C

217 GPa

20.0 °C

210 - 212 GPa

100.0 °C

207 GPa

200.0 °C

193 - 199 GPa

300.0 °C

185 - 192 GPa

400.0 °C

175 - 184 GPa

500.0 °C

175 GPa

600.0 °C

164 GPa

Hardness, Brinell

20.0 °C

156 - 170 [-]

Poisson's ratio

20.0 °C

0.28 [-]

25.0 °C

0.28 - 0.29 [-]

Shear modulus

20.0 °C

81 GPa

Tensile strength

20.0 °C

360 - 570 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

1.1E-5 - 1.25E-5 1/K

200.0 °C

1.18E-5 - 1.3E-5 1/K

300.0 °C

1.36E-5 1/K

400.0 °C

1.32E-5 - 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

460 - 461 J/(kg·K)

100.0 °C

479 - 480 J/(kg·K)

200.0 °C

499 - 520 J/(kg·K)

300.0 °C

517 J/(kg·K)

400.0 °C

536 - 610 J/(kg·K)

500.0 °C

558 J/(kg·K)

600.0 °C

587 J/(kg·K)

Thermal conductivity

20.0 °C

54.4 - 57.5 W/(m·K)

100.0 °C

55.7 W/(m·K)

200.0 °C

51.9 W/(m·K)

300.0 °C

47.6 W/(m·K)

400.0 °C

43.4 W/(m·K)

500.0 °C

39.6 W/(m·K)

600.0 °C

36 W/(m·K)

Thermal diffusivity

20.0 °C

15.9 mm²/s

100.0 °C

14.3 mm²/s

200.0 °C

12.5 mm²/s

300.0 °C

10.8 mm²/s

400.0 °C

9.2 mm²/s

500.0 °C

7.6 mm²/s

600.0 °C

6.1 mm²/s

Electrical

PropertyTemperatureValue

Electrical resistivity

20.0 °C

1.1E-7 Ω·m

100.0 °C

2.3E-7 Ω·m

200.0 °C

3.04E-7 Ω·m

300.0 °C

3.94E-7 Ω·m

400.0 °C

5.01E-7 Ω·m

500.0 °C

6.25E-7 Ω·m

600.0 °C

7.7E-7 Ω·m

Magnetic

PropertyValueComment

Curie temperature

770 °C

Typical for Low Carbon Steel

Chemical properties

PropertyValue

Carbon

0.14 %

Manganese

0.9 - 1.3 %

Phosphorus

0.1 %

Silicon

0.05 %

Sulfur

0.27 - 0.33 %


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