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EN 10222‑4 Grade P355NH Steel – Normalized/Normalized‑Formed (+N) for High‑Strength Applications

Steel P355NH is a weldable fine grained steel with a yield strength of max. 355 N/mm². Application: pressure vessel construction, apparatus engineering, general machine and toolbuilding.

Properties

General

PropertyTemperatureValue

Density

20.0 °C

7.83 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

21 - 23 %

Poisson's ratio

23.0 °C

0.29 [-]

Typical for Low Carbon Steel

Shear modulus

23.0 °C

82 GPa

Typical for Low Carbon Steel

Tensile strength

20.0 °C

490 - 630 MPa

Yield strength

20.0 °C

330 - 355 MPa

200.0 °C

255 MPa

250.0 °C

235 MPa

300.0 °C

216 MPa

350.0 °C

196 MPa

400.0 °C

167 MPa

Yield strength Rp0.2

20.0 °C

320 - 345 MPa

50.0 °C

319 - 343 MPa

100.0 °C

294 - 323 MPa

150.0 °C

275 - 299 MPa

200.0 °C

255 - 275 MPa

250.0 °C

234 - 252 MPa

300.0 °C

215 - 232 MPa

350.0 °C

196 - 214 MPa

400.0 °C

167 - 202 MPa

Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

-100.0 °C

1.08E-5 1/K

20.0 °C

1.19E-5 1/K

100.0 °C

1.25E-5 1/K

200.0 °C

1.3E-5 1/K

300.0 °C

1.36E-5 1/K

400.0 °C

1.41E-5 1/K

500.0 °C

1.45E-5 1/K

600.0 °C

1.49E-5 1/K

Max service temperature

500 °C

Typical for Carbon Steel

Melting point

1480 - 1526 °C

Typical for Low Carbon 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

-100.0 °C

37.6 W/(m·K)

20.0 °C

42.2 W/(m·K)

100.0 °C

43.2 W/(m·K)

200.0 °C

42.9 W/(m·K)

300.0 °C

41.2 W/(m·K)

400.0 °C

39.1 W/(m·K)

500.0 °C

36.6 W/(m·K)

600.0 °C

34.1 W/(m·K)

Thermal diffusivity

-100.0 °C

12.9 mm²/s

20.0 °C

11.7 mm²/s

100.0 °C

11.2 mm²/s

200.0 °C

10.3 mm²/s

300.0 °C

9.4 mm²/s

400.0 °C

8.3 mm²/s

500.0 °C

7.1 mm²/s

600.0 °C

5.7 mm²/s

Electrical

PropertyTemperatureValue

Electrical resistivity

-100.0 °C

1.82E-7 Ω·m

20.0 °C

2.47E-7 Ω·m

100.0 °C

2.96E-7 Ω·m

200.0 °C

3.68E-7 Ω·m

300.0 °C

4.55E-7 Ω·m

400.0 °C

5.56E-7 Ω·m

500.0 °C

6.75E-7 Ω·m

600.0 °C

8.13E-7 Ω·m

Magnetic

PropertyValueComment

Curie temperature

770 °C

Typical for Low Carbon Steel

Chemical properties

PropertyValue

Aluminium

0.02 - 0.06 %

Carbon

0.18 - 0.2 %

Chromium

0.3 %

Copper

0.2 - 0.3 %

Manganese

0.9 - 1.7 %

Molybdenum

0.08 %

Nickel

0.3 - 0.5 %

Niobium

0.05 %

Nitrogen

0.02 %

Phosphorus

0.03 %

Silicon

0.1 - 0.5 %

Sulfur

0.01 - 0.015 %

Vanadium

0.1 %


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    1. EN 10225 S355G7 Steel – Normalized or Normalized Formed (N) for Superior Workability and Weldability
    2. EN 10222-4: P285QH Steel – Normalized / Normalized Formed (+N) for Pressure Vessels & Machinery
    3. EN 10222‑4 Grade P285NH – Weldable Fine‑Grained Steel, Normalized/Normalized‑Formed (N)
    4. EN 10273 Grade P355NH – Normalized & Normalized-Formed (N) High‑Temperature Steel for Pressure Vessels
    5. EN 10222‑4 Grade P355NH Steel – Normalized/Normalized‑Formed (+N) for High‑Strength Applications
    6. EN 10216-2 Grade St 45.8: High‑Temperature Normalized Tube Steel (+N) for Seamless Tubes
    7. EN 10217-2 Grade St 37.8: High‑Temperature Normalized Tube Steel for Industrial Use
    8. EN 10217‑2 Grade St 42.8 Tube Steel – High‑Temperature Normalized Formed for Vessels & Petrochemical Use
    9. EN 10217-3 Grade P355NH: Normalized or Normalized Formed (+N) Fine-Grain Creep-Resistant Steel
    10. EN 10216-3 Grade P355NH: Normalized/Normalized Formed (+N) High-Temperature Weldable Steel