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EN 10222-4 P420QH Quenched & Tempered Steel – High-Strength, Weldable, Ideal for Pressure Vessels

Steel P420QH is a tempered weldable fine grained steel with a yield strength of max. 420 N/mm². Application: pressure vessel construction, apparatus engineering, general machine and toolbuilding.

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

207 GPa

200.0 °C

199 GPa

300.0 °C

192 GPa

400.0 °C

184 GPa

500.0 °C

175 GPa

600.0 °C

164 GPa

Elongation

20.0 °C

17 - 20 %

Poisson's ratio

23.0 °C

0.3 [-]

Typical for Steel

Tensile strength

20.0 °C

510 - 680 MPa

Yield strength

20.0 °C

325 - 420 MPa

200.0 °C

343 MPa

250.0 °C

314 MPa

300.0 °C

294 MPa

350.0 °C

265 MPa

400.0 °C

235 MPa

Yield strength Rp0.2

20.0 °C

315 - 360 MPa

50.0 °C

314 - 363 MPa

100.0 °C

294 - 363 MPa

150.0 °C

274 - 343 MPa

200.0 °C

252 - 314 MPa

250.0 °C

226 - 284 MPa

300.0 °C

206 - 265 MPa

350.0 °C

176 - 235 MPa

400.0 °C

147 - 213 MPa

Thermal

PropertyTemperatureValue

Coefficient of thermal expansion

-100.0 °C

1.05E-5 1/K

20.0 °C

1.15E-5 1/K

100.0 °C

1.21E-5 1/K

200.0 °C

1.27E-5 1/K

300.0 °C

1.32E-5 1/K

400.0 °C

1.36E-5 1/K

500.0 °C

1.4E-5 1/K

600.0 °C

1.44E-5 1/K

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

-100.0 °C

35.4 W/(m·K)

20.0 °C

40.4 W/(m·K)

100.0 °C

42 W/(m·K)

200.0 °C

42 W/(m·K)

300.0 °C

40.8 W/(m·K)

400.0 °C

38.9 W/(m·K)

500.0 °C

36.6 W/(m·K)

600.0 °C

34.3 W/(m·K)

Thermal diffusivity

-100.0 °C

12.1 mm²/s

20.0 °C

11.2 mm²/s

100.0 °C

10.8 mm²/s

200.0 °C

10.1 mm²/s

300.0 °C

9.3 mm²/s

400.0 °C

8.3 mm²/s

500.0 °C

7 mm²/s

600.0 °C

5.8 mm²/s

Electrical

PropertyTemperatureValue

Electrical resistivity

-100.0 °C

1.93E-7 Ω·m

20.0 °C

2.58E-7 Ω·m

100.0 °C

3.05E-7 Ω·m

200.0 °C

3.76E-7 Ω·m

300.0 °C

4.6E-7 Ω·m

400.0 °C

5.59E-7 Ω·m

500.0 °C

6.75E-7 Ω·m

600.0 °C

8.08E-7 Ω·m

Chemical properties

PropertyValue

Aluminium

0.02 - 0.06 %

Carbon

0.2 %

Chromium

0.3 %

Copper

0.2 %

Manganese

1 - 1.7 %

Molybdenum

0.1 %

Nickel

1 %

Niobium

0.05 %

Nitrogen

0.02 %

Phosphorus

0.02 - 0.03 %

Silicon

0.1 - 0.6 %

Sulfur

0.008 - 0.015 %

Vanadium

0.15 - 0.2 %


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