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SEW 555 Grade X21CrMoV12-1 – High-Performance Quenched & Tempered Alloy Steel

The high temperature alloy steel X21CrMoV12-1 is used for larger preshaped components in the quenched and tempered condition in turbine and generator installations, in particular as shafts and discs. The steel is weldable if the relevant measures required are observed.

Properties

General

PropertyTemperatureValue

Density

20.0 °C

7.7 - 7.76 g/cm³

Mechanical

PropertyTemperatureValue

Elastic modulus

20.0 °C

217.68 - 218 GPa

100.0 °C

213 GPa

200.0 °C

206 GPa

300.0 °C

198 GPa

400.0 °C

189 - 190 GPa

500.0 °C

179 - 180 GPa

600.0 °C

166 - 167 GPa

Elongation, transverse

20.0 °C

11 %

Poisson's ratio

20.0 °C

0.28 [-]

Reduction of area, transverse

20.0 °C

40 %

Shear modulus

20.0 °C

84.95 GPa

Tensile strength, transverse

20.0 °C

750 - 900 MPa

Yield strength Rp0.2

100.0 °C

575 MPa

200.0 °C

530 MPa

250.0 °C

505 MPa

300.0 °C

480 MPa

350.0 °C

450 MPa

400.0 °C

425 MPa

450.0 °C

380 MPa

500.0 °C

345 MPa

550.0 °C

285 MPa

600.0 °C

205 MPa

Yield strength Rp0.2, transverse

20.0 °C

600 MPa

Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

20.0 °C

1.02E-5 1/K

100.0 °C

1.05E-5 1/K

200.0 °C

1.09E-5 - 1.1E-5 1/K

300.0 °C

1.13E-5 - 1.15E-5 1/K

400.0 °C

1.16E-5 - 1.2E-5 1/K

500.0 °C

1.2E-5 - 1.23E-5 1/K

600.0 °C

1.22E-5 - 1.25E-5 1/K

Max service temperature, long

0 - 600 °C

Melting point

1370 - 1530 °C

Typical for Martensitic Stainless Steel

Specific heat capacity

20.0 °C

439 J/(kg·K)

100.0 °C

474 J/(kg·K)

200.0 °C

498 J/(kg·K)

300.0 °C

517 J/(kg·K)

400.0 °C

538 J/(kg·K)

500.0 °C

564 J/(kg·K)

600.0 °C

598 J/(kg·K)

Thermal conductivity

20.0 °C

24 W/(m·K)

100.0 °C

24 - 24.4 W/(m·K)

200.0 °C

24.8 - 25 W/(m·K)

300.0 °C

25 - 25.1 W/(m·K)

400.0 °C

25.6 - 26 W/(m·K)

500.0 °C

26 - 26.1 W/(m·K)

600.0 °C

26 - 26.4 W/(m·K)

Thermal diffusivity

20.0 °C

7.1 mm²/s

100.0 °C

6.3 mm²/s

200.0 °C

6 mm²/s

300.0 °C

5.7 mm²/s

400.0 °C

5.4 mm²/s

500.0 °C

4.9 mm²/s

600.0 °C

4.1 mm²/s

Electrical

PropertyTemperatureValue

Electrical resistivity

20.0 °C

6.03E-7 Ω·m

100.0 °C

6.68E-7 Ω·m

200.0 °C

7.43E-7 Ω·m

300.0 °C

8.17E-7 Ω·m

400.0 °C

8.9E-7 Ω·m

500.0 °C

9.62E-7 Ω·m

600.0 °C

1.04E-6 Ω·m

Chemical properties

PropertyValue

Carbon

0.2 - 0.26 %

Chromium

11 - 12.5 %

Manganese

0.3 - 0.8 %

Molybdenum

0.8 - 1.2 %

Nickel

0.3 - 0.8 %

Phosphorus

0.02 - 0.03 %

Silicon

0.2 - 0.5 %

Sulfur

0.007 - 0.02 %

Vanadium

0.25 - 0.35 %


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