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EN 10216-2 Grade X11CrMo9-1+I Seamless Steel Tubes – Isothermally Annealed for High‑Temperature Pressure Applications

Seamless steel tube for pressure purposes with specified elevated temperature properties. The steel grade meet the essential requirements of Directive 97/23/EC.,Seamless tubes of the high-temperature X11CrMo9-1+I are used in steam boiler and pipeline construction, pressure vessel and apparatus engineering, especially in chemical industry and power station construction at temperatures from approx. 200 °C to maximum 400 °C and simultaneously high pressures. The total load and the special scaling circumstances can decrease or increase the temperature limit. Weldability is available.,Seamless tubes of the high-temperature X11CrMo9-1+I are used in steam boiler and pipeline construction, pressure vessel and apparatus engineering, especially in chemical industry and power station construction at temperatures up to approx. 550 °C and simultaneously high pressures. The total load and the special scaling circumstances can decrease or increase the temperature limit. When welding it should be considered that the behavior of the steel depends during and after welding on the applied heat treatment, the preparation and execution of the welding.

Properties

General

PropertyTemperatureValue

Density

20.0 °C

7.77 g/cm³

Mechanical

PropertyTemperatureValueComment

Elastic modulus

20.0 °C

218 GPa

100.0 °C

213 GPa

200.0 °C

206 GPa

300.0 °C

198 GPa

400.0 °C

190 GPa

500.0 °C

180 GPa

600.0 °C

167 GPa

700.0 °C

150 GPa

Elongation

20.0 °C

20 %

Elongation, transverse

20.0 °C

18 %

Poisson's ratio

20.0 °C

0.29 [-]

Typical for Chromium Molybdenum Steel

Tensile strength

20.0 °C

460 - 640 MPa

Tensile strength, transverse

20.0 °C

460 - 640 MPa

Yield strength Rp0.2

20.0 °C

210 MPa

100.0 °C

187 MPa

150.0 °C

186 MPa

200.0 °C

178 MPa

250.0 °C

177 MPa

300.0 °C

175 MPa

350.0 °C

171 MPa

400.0 °C

164 MPa

450.0 °C

153 MPa

500.0 °C

142 MPa

550.0 °C

120 MPa

Yield strength Rp0.2, transverse

20.0 °C

210 MPa

Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

-100.0 °C

1E-5 1/K

20.0 °C

1.08E-5 1/K

100.0 °C

1.13E-5 1/K

200.0 °C

1.18E-5 1/K

300.0 °C

1.23E-5 1/K

400.0 °C

1.27E-5 1/K

500.0 °C

1.3E-5 1/K

600.0 °C

1.32E-5 1/K

700.0 °C

1.33E-5 1/K

Max service temperature, long

0 - 550 °C

Melting point

1382 - 1529 °C

Typical for Chromium Molybdenum Steel

Specific heat capacity

20.0 °C

429 J/(kg·K)

100.0 °C

464 J/(kg·K)

200.0 °C

492 J/(kg·K)

300.0 °C

511 J/(kg·K)

400.0 °C

531 J/(kg·K)

500.0 °C

554 J/(kg·K)

600.0 °C

585 J/(kg·K)

700.0 °C

626 J/(kg·K)

Thermal conductivity

20.0 °C

20.7 W/(m·K)

100.0 °C

22.6 W/(m·K)

200.0 °C

24.4 W/(m·K)

300.0 °C

25.8 W/(m·K)

400.0 °C

26.9 W/(m·K)

500.0 °C

27.8 W/(m·K)

600.0 °C

28.5 W/(m·K)

700.0 °C

28.8 W/(m·K)

Thermal diffusivity

20.0 °C

6.2 mm²/s

100.0 °C

5.9 mm²/s

200.0 °C

6 mm²/s

300.0 °C

6 mm²/s

400.0 °C

5.7 mm²/s

500.0 °C

5.4 mm²/s

600.0 °C

4.8 mm²/s

700.0 °C

4 mm²/s

Electrical

PropertyTemperatureValue

Electrical resistivity

20.0 °C

5.03E-7 Ω·m

100.0 °C

5.67E-7 Ω·m

200.0 °C

6.47E-7 Ω·m

300.0 °C

7.27E-7 Ω·m

400.0 °C

8.09E-7 Ω·m

500.0 °C

8.9E-7 Ω·m

600.0 °C

9.72E-7 Ω·m

700.0 °C

1.06E-6 Ω·m

Chemical properties

PropertyValue

Aluminium

0.04 %

Carbon

0.08 - 0.15 %

Chromium

8 - 10 %

Copper

0.3 %

Manganese

0.3 - 0.6 %

Molybdenum

0.9 - 1.1 %

Phosphorus

0.03 %

Silicon

0.25 - 1 %

Sulfur

0.01 - 0.02 %


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