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DIN 1626 Grade USt 37.0 Steel Tubes – Normalized or Normalized Formed (+N) for High‑Pressure Applications

Welded steel tubes made of USt 37.0 are used in the mechanical engineering, vessel construction, line building and apparatus construction. The permitted working temperature and the allowed operating pressure are defined in subject to the inspection certificate: outer diameter: <=219,1 mm allowed operating pressure [bar]: 64 allowed operating temperature [°C]: max. 300 for delivery with certificate: DIN 50049-2.2 outer diameter: 219,1< d <= 660 mm allowed operating pressure [bar]: 25 allowed operating pressure [°C]: max. 300 for delivery with certificate: DIN 50049-2.2 outer diameter: d > 660 mm allowed operating pressure [bar]: 16 allowed operating pressure [°C]: max. 300 for delivery with certificate: DIN 50049-2.2 outer diameter: all allowed operating pressure [bar]: 160 allowed operating pressure [°C]: max. 300 for delivery with certificate: DIN 50049-3.1 A or B or C Other application limits possible by other technical regulations like TRD, TRB, AD-Merkblätter. The weldability is given for gas welding, arc welding, flash welding, electrical pressure welding and gas pressure welding.

Properties

General

PropertyTemperatureValue

Density

20.0 °C

7.85 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

Elongation

20.0 °C

25 %

Elongation, transverse

20.0 °C

23 %

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

350 - 480 MPa

Tensile strength, transverse

20.0 °C

350 - 480 MPa

Yield strength

20.0 °C

235 MPa

Yield strength Rp0.2

50.0 °C

235 MPa

200.0 °C

185 MPa

250.0 °C

165 MPa

300.0 °C

140 MPa

Yield strength, transverse

20.0 °C

235 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

56.9 W/(m·K)

100.0 °C

56.4 W/(m·K)

200.0 °C

53.5 W/(m·K)

300.0 °C

49.4 W/(m·K)

400.0 °C

45.2 W/(m·K)

500.0 °C

41.3 W/(m·K)

600.0 °C

37.6 W/(m·K)

Thermal diffusivity

20.0 °C

15.7 mm²/s

100.0 °C

14.5 mm²/s

200.0 °C

12.9 mm²/s

300.0 °C

11.2 mm²/s

400.0 °C

9.6 mm²/s

500.0 °C

7.9 mm²/s

600.0 °C

6.3 mm²/s

Electrical

PropertyTemperatureValue

Electrical resistivity

20.0 °C

1.83E-7 Ω·m

100.0 °C

2.27E-7 Ω·m

200.0 °C

2.95E-7 Ω·m

300.0 °C

3.8E-7 Ω·m

400.0 °C

4.81E-7 Ω·m

500.0 °C

5.99E-7 Ω·m

600.0 °C

7.38E-7 Ω·m

Magnetic

PropertyValueComment

Curie temperature

770 °C

Typical for Low Carbon Steel

Chemical properties

PropertyValue

Carbon

0.2 %

Nitrogen

7E-3 %

Phosphorus

0.04 %

Sulfur

0.04 %


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