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DIN 17240 Grade 21CrMoV5-7 Quenched & Tempered Steel – High‑Temperature Performance

High temperature steel for screws and bolts up to 540 °C.

Properties

General

PropertyTemperatureValue

Density

20.0 °C

7.84 g/cm³

Mechanical

PropertyTemperatureValueComment

Elastic modulus

-100.0 °C

217 GPa

20.0 °C

212 GPa

100.0 °C

204 - 207 GPa

200.0 °C

196 - 199 GPa

300.0 °C

186 - 192 GPa

400.0 °C

177 - 184 GPa

500.0 °C

164 - 175 GPa

600.0 °C

127 - 164 GPa

Elongation

20.0 °C

16 %

Hardness, Brinell

20.0 °C

205 - 250 [-]

Poisson's ratio

23.0 °C

0.29 [-]

Typical for Chromium Molybdenum Steel

Reduction of area

20.0 °C

60 %

Tensile strength

20.0 °C

700 - 850 MPa

300.0 °C

590 MPa

350.0 °C

560 MPa

Yield strength Rp0.2

20.0 °C

550 MPa

200.0 °C

500 MPa

250.0 °C

480 MPa

300.0 °C

460 MPa

350.0 °C

441 MPa

400.0 °C

412 MPa

450.0 °C

372 MPa

500.0 °C

334 MPa

550.0 °C

275 MPa

Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

-100.0 °C

1.05E-5 1/K

20.0 °C

1.15E-5 1/K

100.0 °C

1.11E-5 - 1.21E-5 1/K

200.0 °C

1.21E-5 - 1.27E-5 1/K

300.0 °C

1.29E-5 - 1.32E-5 1/K

400.0 °C

1.35E-5 - 1.36E-5 1/K

500.0 °C

1.39E-5 - 1.4E-5 1/K

600.0 °C

1.41E-5 - 1.44E-5 1/K

Max service temperature, long

0 - 540 °C

Melting point

1382 - 1529 °C

Typical for Chromium Molybdenum Steel

Specific heat capacity

-100.0 °C

423 J/(kg·K)

20.0 °C

461 J/(kg·K)

100.0 °C

479 J/(kg·K)

200.0 °C

499 J/(kg·K)

300.0 °C

517 J/(kg·K)

400.0 °C

536 J/(kg·K)

500.0 °C

558 J/(kg·K)

600.0 °C

587 J/(kg·K)

Thermal conductivity

20.0 °C

34.6 W/(m·K)

100.0 °C

36.9 W/(m·K)

200.0 °C

37.3 W/(m·K)

300.0 °C

36.9 W/(m·K)

400.0 °C

35.8 W/(m·K)

500.0 °C

34.4 W/(m·K)

600.0 °C

32.9 W/(m·K)

Thermal diffusivity

20.0 °C

9.6 mm²/s

100.0 °C

9.5 mm²/s

200.0 °C

9 mm²/s

300.0 °C

8.4 mm²/s

400.0 °C

7.6 mm²/s

500.0 °C

6.6 mm²/s

600.0 °C

5.5 mm²/s

Electrical

PropertyTemperatureValue

Electrical resistivity

20.0 °C

3.01E-7 Ω·m

100.0 °C

3.47E-7 Ω·m

200.0 °C

4.23E-7 Ω·m

300.0 °C

5.09E-7 Ω·m

400.0 °C

6.08E-7 Ω·m

500.0 °C

7.19E-7 Ω·m

600.0 °C

8.43E-7 Ω·m

Chemical properties

PropertyValue

Carbon

0.17 - 0.25 %

Chromium

1.2 - 1.5 %

Manganese

0.35 - 0.85 %

Molybdenum

0.65 - 0.8 %

Phosphorus

0.03 %

Silicon

0.15 - 0.35 %

Sulfur

0.035 %

Vanadium

0.25 - 0.35 %


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