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DIN 17240 X8CrNiMoBNb16-16 Steel: Hot Work-Hardened, Age-Hardened for High-Temperature Applications

Hardenable austenitic high temperature steel with addition of B to increase high temperature strength, the creep behaviour and the neutrons absorption. High temperature strength up to 650 °C, resistance to scaling up to 750 °C. Application: for nuts and screws, steam and gas turbines, in the chemicals industry for high loaded parts like screws, shafts, spindles, valves and in the reactor manufacturing

Properties

General

PropertyTemperatureValue

Density

20.0 °C

7.97 - 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 [-]

Reduction of area

20.0 °C

40 %

Shear modulus

20.0 °C

77.3 GPa

Tensile strength

20.0 °C

650 - 850 MPa

Yield strength Rp0.2

20.0 °C

500 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

1.67E-5 - 1.76E-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

1.83E-5 - 1.91E-5 1/K

800.0 °C

1.86E-5 - 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 - 20 W/(m·K)

200.0 °C

16.7 - 20 W/(m·K)

300.0 °C

18.3 - 19 W/(m·K)

400.0 °C

19 - 19.8 W/(m·K)

500.0 °C

21 - 21.3 W/(m·K)

600.0 °C

22 - 22.7 W/(m·K)

700.0 °C

24 - 24.2 W/(m·K)

800.0 °C

25 - 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 - 8.5E-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

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

0.03 %


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