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EN 10216-2 Grade St 45.8: High‑Temperature Normalized Tube Steel (+N) for Seamless Tubes

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

Properties

General

PropertyTemperatureValue

Density

20.0 °C

7.85 g/cm³

50.0 °C

7.84 g/cm³

100.0 °C

7.83 g/cm³

150.0 °C

7.81 g/cm³

200.0 °C

7.79 g/cm³

250.0 °C

7.78 g/cm³

300.0 °C

7.76 g/cm³

350.0 °C

7.74 g/cm³

400.0 °C

7.72 g/cm³

450.0 °C

7.7 g/cm³

500.0 °C

7.68 g/cm³

550.0 °C

7.66 g/cm³

600.0 °C

7.64 g/cm³

Mechanical

PropertyTemperatureValue

Elastic modulus

-100.0 °C

217 GPa

20.0 °C

211.31 - 212 GPa

50.0 °C

209.84 GPa

100.0 °C

206.79 - 207 GPa

150.0 °C

203.36 GPa

200.0 °C

199 - 200 GPa

250.0 °C

195.42 GPa

300.0 °C

191.49 - 192 GPa

350.0 °C

187.47 GPa

400.0 °C

183 - 184 GPa

450.0 °C

179.03 GPa

500.0 °C

174.72 - 175 GPa

550.0 °C

170.2 GPa

600.0 °C

164 - 166 GPa

Elongation

20.0 °C

21 %

Elongation, transverse

20.0 °C

19 %

Poisson's ratio

20.0 °C

0.28 [-]

50.0 °C

0.29 [-]

100.0 °C

0.29 [-]

150.0 °C

0.29 [-]

200.0 °C

0.29 [-]

250.0 °C

0.29 [-]

300.0 °C

0.29 [-]

350.0 °C

0.29 [-]

400.0 °C

0.3 [-]

450.0 °C

0.3 [-]

500.0 °C

0.3 [-]

550.0 °C

0.3 [-]

600.0 °C

0.3 [-]

Shear modulus

20.0 °C

82.31 GPa

50.0 °C

81.62 GPa

100.0 °C

80.34 GPa

150.0 °C

78.97 GPa

200.0 °C

77.4 GPa

250.0 °C

75.83 GPa

300.0 °C

74.16 GPa

350.0 °C

72.5 GPa

400.0 °C

70.73 GPa

450.0 °C

69.06 GPa

500.0 °C

67.3 GPa

550.0 °C

65.53 GPa

600.0 °C

63.67 GPa

Tensile strength

20.0 °C

410 - 530 MPa

Yield strength Rp0.2

20.0 °C

235 - 255 MPa

200.0 °C

190 - 205 MPa

250.0 °C

170 - 185 MPa

300.0 °C

150 - 160 MPa

350.0 °C

135 - 140 MPa

400.0 °C

130 MPa

450.0 °C

125 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

53.4 W/(m·K)

100.0 °C

52.9 - 53 W/(m·K)

200.0 °C

50 - 50.3 W/(m·K)

300.0 °C

46.7 - 47 W/(m·K)

400.0 °C

43 - 43.3 W/(m·K)

500.0 °C

39.8 - 40 W/(m·K)

600.0 °C

36 - 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

50.0 °C

2.11E-7 Ω·m

100.0 °C

2.3E-7 - 2.42E-7 Ω·m

150.0 °C

2.76E-7 Ω·m

200.0 °C

3E-7 - 3.14E-7 Ω·m

250.0 °C

3.55E-7 Ω·m

300.0 °C

3.8E-7 - 4.02E-7 Ω·m

350.0 °C

4.49E-7 Ω·m

400.0 °C

4.8E-7 - 5.02E-7 Ω·m

450.0 °C

5.59E-7 Ω·m

500.0 °C

6E-7 - 6.21E-7 Ω·m

550.0 °C

6.83E-7 Ω·m

600.0 °C

7.4E-7 - 7.55E-7 Ω·m

Magnetic

PropertyValueComment

Curie temperature

770 °C

Typical for Low Carbon Steel

Chemical properties

PropertyValue

Carbon

0.21 %

Manganese

0.4 - 1.2 %

Phosphorus

0.04 %

Silicon

0.1 - 0.35 %

Sulfur

0.04 %


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