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EN 10217-2 Grade St 37.8: High‑Temperature Normalized Tube Steel for Industrial Use

High temperature tube steel for welded tubes and tube products. Applicable up to 500 °C wall temperature for continuous operation. Application: vessel construction, apparatus construction, petrochemical industry

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 - 200 GPa

300.0 °C

192 GPa

400.0 °C

183 - 184 GPa

500.0 °C

175 GPa

600.0 °C

164 - 166 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

360 - 480 MPa

Yield strength Rp0.2

20.0 °C

235 MPa

200.0 °C

185 MPa

250.0 °C

165 MPa

300.0 °C

140 MPa

350.0 °C

120 MPa

400.0 °C

110 MPa

450.0 °C

105 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

1.22E-5 - 1.25E-5 1/K

200.0 °C

1.29E-5 - 1.3E-5 1/K

300.0 °C

1.34E-5 - 1.36E-5 1/K

400.0 °C

1.4E-5 - 1.41E-5 1/K

500.0 °C

1.43E-5 - 1.45E-5 1/K

600.0 °C

1.46E-5 - 1.49E-5 1/K

Max service temperature

500 °C

Typical for Carbon Steel

Max service temperature, long

0 - 500 °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 - 500 J/(kg·K)

200.0 °C

499 - 540 J/(kg·K)

300.0 °C

517 - 580 J/(kg·K)

400.0 °C

536 - 620 J/(kg·K)

500.0 °C

558 - 690 J/(kg·K)

600.0 °C

587 - 780 J/(kg·K)

Thermal conductivity

20.0 °C

56.9 W/(m·K)

100.0 °C

56.4 - 57 W/(m·K)

200.0 °C

53.5 - 54 W/(m·K)

300.0 °C

49.4 - 50 W/(m·K)

400.0 °C

45 - 45.2 W/(m·K)

500.0 °C

41.3 - 42 W/(m·K)

600.0 °C

37 - 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 - 2.3E-7 Ω·m

200.0 °C

2.95E-7 - 3E-7 Ω·m

300.0 °C

3.8E-7 Ω·m

400.0 °C

4.8E-7 - 4.81E-7 Ω·m

500.0 °C

5.99E-7 - 6E-7 Ω·m

600.0 °C

7.38E-7 - 7.4E-7 Ω·m

Magnetic

PropertyValueComment

Curie temperature

770 °C

Typical for Low Carbon Steel

Chemical properties

PropertyValue

Carbon

0.17 %

Manganese

0.4 - 0.8 %

Phosphorus

0.04 %

Silicon

0.1 - 0.35 %

Sulfur

0.04 %


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