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EN 10269 X7CrNiMoBNb16-16: Warm‑Worked & Precipitation‑Hardened High‑Temperature Steel

Hardenable austenitic high-temperature steel with boron addition for an increase of thermal resistance and creep behavior as well as for neutron absorption. Thermal resistance up to 650 °C, scaling resistance up to 750 °C Application for screws and nuts, steam and gas turbines and in chemical industry for high-stress components, such as screws, shafts, spindles, valves, in reactor engineering. Further application for mounting elements at increased temperatures.

Properties

General

PropertyTemperatureValue

Density

20.0 °C

7.9 - 8.01 g/cm³

Mechanical

PropertyTemperatureValue

Elastic modulus

-100.0 °C

206 GPa

20.0 °C

196 - 197.57 GPa

100.0 °C

190 - 192 GPa

200.0 °C

182 - 186 GPa

300.0 °C

174 - 181 GPa

400.0 °C

166 - 174 GPa

500.0 °C

158 - 165 GPa

600.0 °C

150 - 157 GPa

700.0 °C

142 - 147 GPa

800.0 °C

134 GPa

Elongation

20.0 °C

16 %

Poisson's ratio

20.0 °C

0.28 [-]

Shear modulus

20.0 °C

77.3 GPa

Tensile strength

20.0 °C

650 - 850 MPa

50.0 °C

635 MPa

100.0 °C

615 MPa

150.0 °C

590 MPa

200.0 °C

570 MPa

250.0 °C

550 MPa

300.0 °C

530 MPa

350.0 °C

505 MPa

400.0 °C

485 MPa

450.0 °C

460 MPa

500.0 °C

440 MPa

550.0 °C

420 MPa

600.0 °C

395 MPa

650.0 °C

375 MPa

Yield strength Rp0.2

20.0 °C

500 MPa

50.0 °C

489 MPa

100.0 °C

470 MPa

150.0 °C

451 MPa

200.0 °C

432 MPa

250.0 °C

412 MPa

300.0 °C

393 MPa

350.0 °C

372 MPa

400.0 °C

353 MPa

450.0 °C

334 MPa

500.0 °C

314 MPa

550.0 °C

284 MPa

600.0 °C

255 MPa

650.0 °C

206 MPa

Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

-100.0 °C

1.49E-5 1/K

20.0 °C

1.61E-5 1/K

100.0 °C

1.66E-5 - 1.67E-5 1/K

200.0 °C

1.72E-5 - 1.77E-5 1/K

300.0 °C

1.77E-5 - 1.79E-5 1/K

400.0 °C

1.79E-5 - 1.81E-5 1/K

500.0 °C

1.79E-5 - 1.84E-5 1/K

600.0 °C

1.81E-5 - 1.88E-5 1/K

700.0 °C

1.91E-5 1/K

800.0 °C

1.94E-5 1/K

900.0 °C

1.97E-5 1/K

1000.0 °C

2E-5 1/K

Max service temperature, long

0 - 750 °C

Melting point

1230 - 1480 °C

Typical for Austenitic Stainless Steel

Specific heat capacity

-100.0 °C

440 J/(kg·K)

20.0 °C

460 - 472 J/(kg·K)

100.0 °C

487 J/(kg·K)

200.0 °C

503 J/(kg·K)

300.0 °C

512 J/(kg·K)

400.0 °C

520 J/(kg·K)

500.0 °C

530 J/(kg·K)

600.0 °C

541 J/(kg·K)

700.0 °C

551 J/(kg·K)

800.0 °C

559 J/(kg·K)

900.0 °C

565 J/(kg·K)

1000.0 °C

571 J/(kg·K)

Thermal conductivity

20.0 °C

13.5 - 15 W/(m·K)

100.0 °C

14.9 W/(m·K)

200.0 °C

16.7 W/(m·K)

300.0 °C

18.3 W/(m·K)

400.0 °C

19.8 W/(m·K)

500.0 °C

21.3 W/(m·K)

600.0 °C

22.7 W/(m·K)

700.0 °C

24.2 W/(m·K)

800.0 °C

25.6 W/(m·K)

Thermal diffusivity

20.0 °C

3.6 mm²/s

100.0 °C

3.7 mm²/s

200.0 °C

4 mm²/s

300.0 °C

4.4 mm²/s

400.0 °C

4.6 mm²/s

500.0 °C

4.7 mm²/s

600.0 °C

4.9 mm²/s

700.0 °C

5.2 mm²/s

800.0 °C

5.5 mm²/s

Electrical

PropertyTemperatureValue

Electrical resistivity

20.0 °C

7.75E-7 Ω·m

100.0 °C

8.42E-7 Ω·m

200.0 °C

9.04E-7 Ω·m

300.0 °C

9.62E-7 Ω·m

400.0 °C

1.01E-6 Ω·m

500.0 °C

1.06E-6 Ω·m

600.0 °C

1.1E-6 Ω·m

700.0 °C

1.13E-6 Ω·m

800.0 °C

1.16E-6 Ω·m

Chemical properties

PropertyValue

Boron

0.05 - 0.1 %

Carbon

0.04 - 0.1 %

Chromium

15.5 - 17.5 %

Manganese

1.5 %

Molybdenum

1.6 - 2 %

Nickel

15.5 - 17.5 %

Phosphorus

0.05 %

Silicon

0.3 - 0.6 %

Sulfur

0.015 - 0.03 %


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