Elongation: P355NH özgü a minimum elongation of 22% (based on a gauge length of 5.65√S0), which indicates its ability to deform before fracture or failure.

The mechanical properties of P355NH and P355GH steel are similar, as they are both high-temperature pressure vessel steels.

1. Tensile Strength: The tensile strength of P355NH and P355GH steel is typically between 490 N/mm² and 630 N/mm².

2. Yield Strength: The yield strength of P355NH and P355GH steel is typically between 355 N/mm² and 510 N/mm².

3. Elongation: The elongation at break of P355NH and P355GH steel is typically between 20% and 22%.

4. Impact toughness: P355NH and P355GH steel have good impact toughness at low temperatures, typically around -20°C.

5. Hardness: The hardness of P355NH and P355GH steel is typically between 160 HB and 190 HB.

These mechanical properties make P355NH and P355GH steel suitable for use in high-temperature pressure vessels, boilers, and other equipment that operate under high mechanical stress and elevated temperatures.