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DIN 1628 Grade St 44.4: Normalized or Normalized Formed Steel Tubes (+N) – Specifications & Applications

Welded steel tubes made from St 44.4 are used in the apparatus engineering, container and pipe construction as well as mechanical engineering. Allowed max. operating temperature 300 °C. The steel is weldable.

Properties

General

PropertyTemperatureValueComment

Density

23.0 °C

7.8 - 7.9 g/cm³

Typical for Low Carbon Steel

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

Elongation

20.0 °C

21 %

Elongation, transverse

20.0 °C

19 %

Poisson's ratio

20.0 °C

0.28 [-]

Shear modulus

23.0 °C

82 GPa

Typical for Low Carbon Steel

Tensile strength

20.0 °C

420 - 550 MPa

Tensile strength, transverse

20.0 °C

420 - 550 MPa

Yield strength

20.0 °C

265 - 275 MPa

Yield strength Rp0.2

50.0 °C

255 - 275 MPa

200.0 °C

200 - 215 MPa

250.0 °C

180 - 195 MPa

300.0 °C

155 - 165 MPa

Yield strength, transverse

20.0 °C

265 - 275 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

Max service temperature, long

0 - 300 °C

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

53.4 W/(m·K)

100.0 °C

52.9 W/(m·K)

200.0 °C

50.3 W/(m·K)

300.0 °C

46.7 W/(m·K)

400.0 °C

43.3 W/(m·K)

500.0 °C

39.8 W/(m·K)

600.0 °C

36.7 W/(m·K)

Thermal diffusivity

20.0 °C

14.8 mm²/s

100.0 °C

13.6 mm²/s

200.0 °C

12.1 mm²/s

300.0 °C

10.6 mm²/s

400.0 °C

9.2 mm²/s

500.0 °C

7.7 mm²/s

600.0 °C

6.2 mm²/s

Electrical

PropertyTemperatureValue

Electrical resistivity

20.0 °C

1.95E-7 Ω·m

100.0 °C

2.42E-7 Ω·m

200.0 °C

3.14E-7 Ω·m

300.0 °C

4.02E-7 Ω·m

400.0 °C

5.02E-7 Ω·m

500.0 °C

6.21E-7 Ω·m

600.0 °C

7.55E-7 Ω·m

Magnetic

PropertyValueComment

Curie temperature

770 °C

Typical for Low Carbon Steel

Chemical properties

PropertyValue

Aluminium

0.02 %

Carbon

0.2 %

Manganese

0.4 %

Phosphorus

0.04 %

Silicon

0.35 %

Sulfur

0.04 %


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