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DIN 17179 Grade WStE 255: Normalized or Normalized‑Formed Steel Tubes for High‑Temperature Applications

The fine grained steel is used acc. DIN 17178 : 1986-5 for welded steel tubes and acc. DIN 17179 : 1986-5 as seamless steel tubes for special purposes from -20 to 400 °C. Application: pressure vessel construction, apparatus construction, pipelines, mechanical engineering, toolbuilding Special requirements regarding processing have to be arranged (e.g. coatings). For welded tubes the calculation with the 100 % loads are possible for the seam area.

Properties

General

PropertyTemperatureValue

Density

20.0 °C

7.84 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

23.0 °C

0.29 [-]

Typical for Low Carbon Steel

Shear modulus

23.0 °C

82 GPa

Typical for Low Carbon Steel

Tensile strength

20.0 °C

360 - 480 MPa

Tensile strength, transverse

20.0 °C

360 - 480 MPa

Yield strength

20.0 °C

225 - 255 MPa

Yield strength Rp0.2

100.0 °C

206 - 226 MPa

150.0 °C

186 - 206 MPa

200.0 °C

177 - 186 MPa

250.0 °C

157 - 167 MPa

300.0 °C

127 - 137 MPa

350.0 °C

108 - 118 MPa

400.0 °C

98 - 108 MPa

Yield strength, transverse

20.0 °C

225 - 255 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

-20 - 400 °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

-100.0 °C

46.5 W/(m·K)

20.0 °C

49.4 W/(m·K)

100.0 °C

49.4 W/(m·K)

200.0 °C

47.8 W/(m·K)

300.0 °C

45.1 W/(m·K)

400.0 °C

41.8 W/(m·K)

500.0 °C

38.6 W/(m·K)

600.0 °C

35.3 W/(m·K)

Thermal diffusivity

-100.0 °C

15.9 mm²/s

20.0 °C

13.7 mm²/s

100.0 °C

12.7 mm²/s

200.0 °C

11.5 mm²/s

300.0 °C

10.2 mm²/s

400.0 °C

8.9 mm²/s

500.0 °C

7.4 mm²/s

600.0 °C

5.8 mm²/s

Electrical

PropertyTemperatureValue

Electrical resistivity

-100.0 °C

1.47E-7 Ω·m

20.0 °C

2.11E-7 Ω·m

100.0 °C

2.59E-7 Ω·m

200.0 °C

3.3E-7 Ω·m

300.0 °C

4.16E-7 Ω·m

400.0 °C

5.2E-7 Ω·m

500.0 °C

6.41E-7 Ω·m

600.0 °C

7.85E-7 Ω·m

Magnetic

PropertyValueComment

Curie temperature

770 °C

Typical for Low Carbon Steel

Chemical properties

PropertyValue

Aluminium

0.02 %

Carbon

0.18 %

Chromium

0.3 %

Copper

0.2 %

Manganese

0.5 - 1.3 %

Molybdenum

0.08 %

Nickel

0.3 %

Niobium

0.03 %

Nitrogen

0.02 %

Phosphorus

0.04 %

Silicon

0.4 %

Sulfur

0.03 %

Vanadium

0.05 %


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